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Guo H, Deng Y, Yin H, Liu J, Zou S. Fabricating BiOCl Nanoflake/FeOCl Nanospindle Heterostructures for Efficient Visible-Light Photocatalysis. Molecules 2023; 28:6949. [PMID: 37836792 PMCID: PMC10574461 DOI: 10.3390/molecules28196949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Revised: 10/01/2023] [Accepted: 10/04/2023] [Indexed: 10/15/2023] Open
Abstract
Fabricating heterostructures with abundant interfaces and delicate nanoarchitectures is an attractive approach for optimizing photocatalysts. Herein, we report the facile synthesis of BiOCl nanoflake/FeOCl nanospindle heterostructures through a solution chemistry method at room temperature. Characterizations, including XRD, SEM, TEM, EDS, and XPS, were employed to investigate the synthesized materials. The results demonstrate that the in situ reaction between the Bi precursors and the surface Cl- of FeOCl enabled the bounded nucleation and growth of BiOCl on the surface of FeOCl nanospindles. Stable interfacial structures were established between BiOCl nanoflakes and FeOCl nanospindles using Cl- as the bridge. Regulating the Bi-to-Fe ratios allowed for the optimization of the BiOCl/FeOCl interface, thereby facilitating the separation of photogenerated carriers and accelerating the photocatalytic degradation of RhB. The BiOCl/FeOCl heterostructures with an optimal composition of 15% BiOCl exhibited ~90 times higher visible-light photocatalytic activity than FeOCl. Based on an analysis of the band structures and reactive oxygen species, we propose an S-scheme mechanism to elucidate the significantly enhanced photocatalytic performance observed in the BiOCl/FeOCl heterostructures.
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Affiliation(s)
- Heng Guo
- College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310036, China; (H.G.); (Y.D.); (H.Y.)
| | - Yangzhou Deng
- College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310036, China; (H.G.); (Y.D.); (H.Y.)
| | - Haoyong Yin
- College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310036, China; (H.G.); (Y.D.); (H.Y.)
| | - Juanjuan Liu
- College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310036, China; (H.G.); (Y.D.); (H.Y.)
| | - Shihui Zou
- Key Laboratory of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou 310027, China
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2
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Korotcenkov G, Tolstoy VP. Current Trends in Nanomaterials for Metal Oxide-Based Conductometric Gas Sensors: Advantages and Limitations-Part 2: Porous 2D Nanomaterials. Nanomaterials (Basel) 2023; 13:237. [PMID: 36677992 PMCID: PMC9867534 DOI: 10.3390/nano13020237] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 01/01/2023] [Accepted: 01/02/2023] [Indexed: 06/17/2023]
Abstract
This article discusses the features of the synthesis and application of porous two-dimensional nanomaterials in developing conductometric gas sensors based on metal oxides. It is concluded that using porous 2D nanomaterials and 3D structures based on them is a promising approach to improving the parameters of gas sensors, such as sensitivity and the rate of response. The limitations that may arise when using 2D structures in gas sensors intended for the sensor market are considered.
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Affiliation(s)
- Ghenadii Korotcenkov
- Department of Physics and Engineering, Moldova State University, 2009 Chisinau, Moldova
| | - Valeri P. Tolstoy
- Institute of Chemistry, Saint Petersburg State University, Saint Petersburg 198504, Russia
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3
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Shao H, Luo S, Descamps‐Mandine A, Ge K, Lin Z, Taberna P, Gogotsi Y, Simon P. Synthesis of MAX Phase Nanofibers and Nanoflakes and the Resulting MXenes. Adv Sci (Weinh) 2022; 10:e2205509. [PMID: 36398608 PMCID: PMC9811477 DOI: 10.1002/advs.202205509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 10/24/2022] [Indexed: 06/16/2023]
Abstract
Layered ternary carbides and nitrides, also known as MAX phases, have attracted enormous attention for many applications, especially as precursors to produce 2D metal carbides and nitrides called MXenes. However, it is still challenging to tune and control the shape/morphology of MAX phase particles at the nanoscale, as they are typically manufactured as large grains using ceramic technology. Herein, nanostructured Ti-Al-C MAX phases with fine-tuned morphology of nanofibers and nanoflakes are prepared by using 1D and 2D carbon precursors at a synthesis temperature of 900 °C. The nanostructured MAX phases are used as precursors to produce nanosized multilayered MXenes, with a considerably shorter etching time and a low reaction temperature. These nanosized MXenes exhibit good electrochemical lithium-ion storage properties and a pseudocapacitive electrochemical signature. The obtained Ti2 CTx MXene electrode can deliver delithiation capacity of 300 mAh g-1 at low rates and 100 mAh g-1 when the lithiation/delithiation cycle happens within 30 s. Availability of nanoscale MAX phases and MXene nanoflakes with small lateral size may open new opportunities for both classes of materials.
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Affiliation(s)
- Hui Shao
- Materials Science Department‐CIRIMATUniversité Paul SabatierToulouse31062France
- Réseau sur le Stockage Electrochimique de l'Energie (RS2E)FR CNRSAmiens80039France
| | - Sha Luo
- Materials Science Department‐CIRIMATUniversité Paul SabatierToulouse31062France
- College of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou730000China
| | | | - Kangkang Ge
- Materials Science Department‐CIRIMATUniversité Paul SabatierToulouse31062France
- Réseau sur le Stockage Electrochimique de l'Energie (RS2E)FR CNRSAmiens80039France
| | - Zifeng Lin
- College of Materials Science and EngineeringSichuan UniversityChengdu610065China
| | - Pierre‐Louis Taberna
- Materials Science Department‐CIRIMATUniversité Paul SabatierToulouse31062France
- Réseau sur le Stockage Electrochimique de l'Energie (RS2E)FR CNRSAmiens80039France
| | - Yury Gogotsi
- A.J. Drexel Nanomaterials Institute and Department of Materials Science and EngineeringDrexel UniversityPhiladelphiaPA19104USA
| | - Patrice Simon
- Materials Science Department‐CIRIMATUniversité Paul SabatierToulouse31062France
- Réseau sur le Stockage Electrochimique de l'Energie (RS2E)FR CNRSAmiens80039France
- Institut Universitaire de FranceParis75005France
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4
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Gaur R, Shahabuddin S, Ahmad I, Sridewi N. Role of Alkylamines in Tuning the Morphology and Optical Properties of SnS 2 Nanoparticles Synthesized by via Facile Thermal Decomposition Approach. Nanomaterials (Basel) 2022; 12:3950. [PMID: 36432233 PMCID: PMC9695573 DOI: 10.3390/nano12223950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 11/02/2022] [Accepted: 11/03/2022] [Indexed: 06/16/2023]
Abstract
The present study reported the synthesis of SnS2 nanoparticles by using a thermal decomposition approach using tin chloride and thioacetamide in diphenyl ether at 200 °C over 60 min. SnS2 nanoparticles with novel morphologies were prepared by the use of different alkylamines (namely, octylamine (OCA), dodecylamine (DDA), and oleylamine (OLA)), and their role during the synthesis was explored in detail. The synthesized SnS2 nanostructures were characterized using an array of analytical techniques. The XRD results confirmed the formation of hexagonal SnS2, and the crystallite size varied from 6.1 nm to 19.0 nm and from 2.5 to 8.8 nm for (100) and (011) reflections, respectively. The functional group and thermal analysis confirmed the presence of organics on the surface of nanoparticles. The FE-SEM results revealed nanoparticles, nanoplates, and flakes assembled into flower-like morphologies when dodecylamine, octylamine, and oleylamine were used as capping agents, respectively. The analysis of optical properties showed the variation in the bandgap and the concentration of surface defects on the SnS2 nanoparticles. The role of alkylamine as a capping agent was explored and discussed in detail in this paper and the mechanism for the evolution of different morphologies of SnS2 nanoparticles was also proposed.
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Affiliation(s)
- Rama Gaur
- Department of Chemistry, School of Technology, Pandit Deendayal Energy University, Knowledge Corridor, Raysan, Gandhinagar 382426, Gujarat, India
| | - Syed Shahabuddin
- Department of Chemistry, School of Technology, Pandit Deendayal Energy University, Knowledge Corridor, Raysan, Gandhinagar 382426, Gujarat, India
| | - Irfan Ahmad
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Khalid University, Abha 61421, Saudi Arabia
| | - Nanthini Sridewi
- Department of Maritime Science and Technology, Faculty of Defence Science and Technology, National Defence University of Malaysia, Kuala Lumpur 57000, Malaysia
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Chang CY, Wu YW, Yang SH, Abdulhalim I. Preparation of Nickel Oxide Nanoflakes for Carrier Extraction and Transport in Perovskite Solar Cells. Nanomaterials (Basel) 2022; 12:nano12193336. [PMID: 36234464 PMCID: PMC9565255 DOI: 10.3390/nano12193336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Revised: 09/20/2022] [Accepted: 09/22/2022] [Indexed: 05/14/2023]
Abstract
Hole transport layers (HTLs) with high conductivity, charge extraction ability, and carrier transport capability are highly important for fabricating perovskite solar cells (PSCs) with high power conversion efficiency and device stability. Low interfacial recombination between the HTL and perovskite absorber is also crucial to the device performance of PSCs. In this work, we developed a three-stage method to prepare NiOx nanoflakes as the HTL in the inverted PSCs. Due to the addition of the nanoflake layer, the deposited perovskite films with larger grain sizes and fewer boundaries were obtained, implying higher photogenerated current and fill factors in our PSCs. Meanwhile, the downshifted valence band of the NiOx HTL improved hole extraction from the perovskite absorber and open-circuit voltages of PSCs. The optimized device based on the NiOx nanoflakes showed the highest efficiency of 14.21% and a small hysteresis, which outperformed the NiOx thin film as the HTL. Furthermore, the device maintained 83% of its initial efficiency after 60 days of storage. Our results suggest that NiOx nanoflakes provide great potential for constructing PSCs with high efficiency and long-term stability.
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Affiliation(s)
- Chih-Yu Chang
- Institute of Lighting and Energy Photonics, College of Photonics, National Yang Ming Chiao Tung University, No. 301, Section 2, Gaofa 3rd Road, Guiren District, Tainan 71150, Taiwan
| | - You-Wei Wu
- Institute of Lighting and Energy Photonics, College of Photonics, National Yang Ming Chiao Tung University, No. 301, Section 2, Gaofa 3rd Road, Guiren District, Tainan 71150, Taiwan
| | - Sheng-Hsiung Yang
- Institute of Lighting and Energy Photonics, College of Photonics, National Yang Ming Chiao Tung University, No. 301, Section 2, Gaofa 3rd Road, Guiren District, Tainan 71150, Taiwan
- Correspondence:
| | - Ibrahim Abdulhalim
- Department of Electro-Optics and Photonics Engineering and the Ilse Katz Institute for Nanoscale Science and Technology, School of Electrical and Computer Engineering, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
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6
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Abbas Q, Mateen A, Khan AJ, Eldesoky GE, Idrees A, Ahmad A, Eldin ET, Das HT, Sajjad M, Javed MS. Binder-Free Zinc-Iron Oxide as a High-Performance Negative Electrode Material for Pseudocapacitors. Nanomaterials (Basel) 2022; 12:3154. [PMID: 36144942 PMCID: PMC9504540 DOI: 10.3390/nano12183154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Accepted: 09/07/2022] [Indexed: 06/16/2023]
Abstract
The interaction between cathode and anode materials is critical for developing a high-performance asymmetric supercapacitor (SC). Significant advances have been made for cathode materials, while the anode is comparatively less explored for SC applications. Herein, we proposed a high-performance binder-free anode material composed of two-dimensional ZnFe2O4 nanoflakes supported on carbon cloth (ZFO-NF@CC). The electrochemical performance of ZFO-NF@CC as an anode material for supercapacitor application was examined in a KOH solution via a three-electrode configuration. The ZFO-NF@CC electrode demonstrated a specific capacitance of 509 F g-1 at 1.5 A g-1 and was retained 94.2% after 10,000 GCD cycles. The ZFO-NF@CC electrode showed exceptional charge storage properties by attaining high pseudocapacitive-type storage. Furthermore, an asymmetric SC device was fabricated using ZFO-NF@CC as an anode and activated carbon on CC (AC@CC) as a cathode with a KOH-based aqueous electrolyte (ZFO-NF@CC||AC@CC). The ZFO-NF@CC||AC@CC yielded a high specific capacitance of 122.2 F g-1 at a current density of 2 A g-1, a high energy density of 55.044 Wh kg-1 at a power density of 1801.44 W kg-1, with a remarkable retention rate of 96.5% even after 4000 cycles was attained. Thus, our results showed that the enhanced electrochemical performance of ZFO-NF@CC used as an anode in high-performance SC applications can open new research directions for replacing carbon-based anode materials.
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Affiliation(s)
- Qasim Abbas
- Department of Intelligent Manufacturing, Yibin University, Yibin 644000, China
| | - Abdul Mateen
- Beijing Key Laboratory of Energy Conversion and Storage Materials, Department of Physics, Beijing Normal University, Beijing 100084, China
| | - Abdul Jabbar Khan
- College of Chemical Engineering, Huanggang Normal University, Huanggang 438000, China
| | - Gaber E. Eldesoky
- Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Asim Idrees
- Department of Applied Sciences, National Textile University, Faisalabad 37610, Pakistan
| | - Awais Ahmad
- Departamento de Quimica Organica, Universidad de Cordoba, E14014 Cordoba, Spain
| | - Elsayed Tag Eldin
- Faculty of Engineering and Technology, Future University in Egypt, New Cairo 11835, Egypt
| | - Himadri Tanaya Das
- Centre of Excellence for Advance Materials and Applications, Utkal University, Bhubaneswar 751004, Odisha, India
| | - Muhammad Sajjad
- College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China
| | - Muhammad Sufyan Javed
- School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
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7
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Guo X, Li N, Wu C, Dai X, Qi R, Qiao T, Su T, Lei D, Liu N, Du J, Wang E, Yang X, Gao P, Dai Q. Studying Plasmon Dispersion of MXene for Enhanced Electromagnetic Absorption. Adv Mater 2022; 34:e2201120. [PMID: 35470492 DOI: 10.1002/adma.202201120] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 03/31/2022] [Indexed: 05/23/2023]
Abstract
2D metal carbides and nitrides (MXene) are promising candidates for electromagnetic (EM) shielding, saturable absorption, thermal therapy, and photocatalysis owing to their excellent EM absorption. The plasmon resonances in metallic MXene micro/nanostructures may play an important role in enhancing the EM absorption; however, their contribution has not been determined due to the lack of a precise understanding of its plasmon behavior. Here, the use of high-spatial-resolution electron energy-loss spectroscopy to measure the plasmon dispersion of MXene films with different thicknesses is reported, enabling accurate analysis of the EM absorption of complex MXene structures in a wide frequency range via a theoretical model. The EM absorption of MXene can be excited at the desired frequency by controlling the momentum (e.g., the sizes of the nanoflakes for EM excitation) as the strength can be enhanced by increasing the layer number and the interlayer distance in MXene. For example, a 3 nm interlayer distance can nearly double the plasmon-enhanced EM absorption in MXene nanostructures. These findings can guide the design of advanced ultrathin EM absorption materials for a broad range of applications.
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Affiliation(s)
- Xiangdong Guo
- CAS Key Laboratory of Nanophotonic Materials and Devices, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Ning Li
- Electron Microscopy Laboratory, School of Physics, Peking University, Beijing, 100871, China
| | - Chenchen Wu
- CAS Key Laboratory of Nanophotonic Materials and Devices, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xiaokang Dai
- CAS Key Laboratory of Nanophotonic Materials and Devices, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Ruishi Qi
- Electron Microscopy Laboratory, School of Physics, Peking University, Beijing, 100871, China
| | - Tianyu Qiao
- Electron Microscopy Laboratory, School of Physics, Peking University, Beijing, 100871, China
| | - Tuoyi Su
- School of Physics, Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), Wuhan, 430074, P. R. China
| | - Dandan Lei
- School of Physics, Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), Wuhan, 430074, P. R. China
| | - Nishuang Liu
- School of Physics, Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), Wuhan, 430074, P. R. China
| | - Jinlong Du
- Electron Microscopy Laboratory, School of Physics, Peking University, Beijing, 100871, China
| | - Enge Wang
- International Center for Quantum Materials, Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials, Collaborative Innovation Center of Quantum Matter, Beijing, 100871, China
| | - Xiaoxia Yang
- CAS Key Laboratory of Nanophotonic Materials and Devices, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Peng Gao
- Electron Microscopy Laboratory, School of Physics, Peking University, Beijing, 100871, China
- International Center for Quantum Materials, Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials, Collaborative Innovation Center of Quantum Matter, Beijing, 100871, China
| | - Qing Dai
- CAS Key Laboratory of Nanophotonic Materials and Devices, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
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8
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Rabbani SS, Nisar A, Zafar A, Liu Y, Sun H, Karim S, Hussain S, Shah AU, Hussain SZ, Mehboob N, Yu Y, Ahmad M. Mesoporous NiCo 2S 4nanoflakes as an efficient and durable electrocatalyst for non-enzymatic detection of cholesterol. Nanotechnology 2022; 33:375502. [PMID: 35749132 DOI: 10.1088/1361-6528/ac75fb] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Accepted: 06/05/2022] [Indexed: 06/15/2023]
Abstract
The detection of cholesterol is very crucial in clinical diagnosis for rapid and accurate monitoring of multiple disease-biomarkers. There is a great need for construction of a highly reliable and stable electrocatalyst for the efficient detection of cholesterol. In this work, mesoporous NiCo2S4nanoflakes of enhanced electrochemical properties are prepared through a facile hydrothermal approach. The developed nanoflakes modified nickel foam electrode exhibits outstanding electrocatalytic properties for the detection of cholesterol with high selectivity. The electrode displays excellent sensitivity of 8623.6μA mM-1cm-2, in the wide linear range from 0.01 to 0.25 mM with a low detection limit of 0.01μM. In addition, NiCo2S4structure reveals good thermal stability and reproducibility over a period of 8 weeks. Moreover, the nanoflakes show good response for detection of cholesterol in real samples. Our results demonstrate the potential use of NiCo2S4as a catalyst for the development of cost-effective electrochemical sensors for medical and industrial applications.
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Affiliation(s)
- Syeda Sughra Rabbani
- Nanomaterials Research Group, Physics Division, PINSTECH, Islamabad 44000, Pakistan
- Department of Physics, Riphah International University, Islamabad 46000, Pakistan
| | - Amjad Nisar
- Nanomaterials Research Group, Physics Division, PINSTECH, Islamabad 44000, Pakistan
| | - Amina Zafar
- Nanomaterials Research Group, Physics Division, PINSTECH, Islamabad 44000, Pakistan
- Central Analytical Facility Division, PINSTECH, Islamabad 44000, Pakistan
| | - Yanguo Liu
- School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, People's Republic of China
| | - Hongyu Sun
- School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, People's Republic of China
| | - Shafqat Karim
- Nanomaterials Research Group, Physics Division, PINSTECH, Islamabad 44000, Pakistan
| | - Shafqat Hussain
- Nanomaterials Research Group, Physics Division, PINSTECH, Islamabad 44000, Pakistan
| | - Atta Ullah Shah
- National Institute of Lasers and Optronics College, Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad 45650, Pakistan
| | | | - Nasir Mehboob
- Department of Physics, Riphah International University, Islamabad 46000, Pakistan
| | - Yanlong Yu
- College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing, 163318, People's Republic of China
| | - Mashkoor Ahmad
- Nanomaterials Research Group, Physics Division, PINSTECH, Islamabad 44000, Pakistan
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9
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Bamuqaddam AM, Aladeemy SA, Ghanem MA, Al-Mayouf AM, Alotaibi NH, Marken F. Foam Synthesis of Nickel/Nickel (II) Hydroxide Nanoflakes Using Double Templates of Surfactant Liquid Crystal and Hydrogen Bubbles: A High-Performance Catalyst for Methanol Electrooxidation in Alkaline Solution. Nanomaterials (Basel) 2022; 12:879. [PMID: 35269368 DOI: 10.3390/nano12050879] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 02/28/2022] [Accepted: 03/03/2022] [Indexed: 12/04/2022]
Abstract
This work demonstrates the chemical synthesis of two-dimensional nanoflakes of mesoporous nickel/nickel (II) hydroxide (Ni/Ni(OH)2-NFs) using double templates of surfactant self-assembled thin-film and foam of hydrogen bubbles produced by sodium borohydride reducing agent. Physicochemical characterizations show the formation of amorphous mesoporous 2D nanoflakes with a Ni/Ni(OH)2 structure and a high specific surface area (165 m2/g). Electrochemical studies show that the electrocatalytic activity of Ni/Ni(OH)2 nanoflakes towards methanol oxidation in alkaline solution is significantly enhanced in comparison with that of parent bare-Ni(OH)2 deposited from surfactant-free solution. Cyclic voltammetry shows that the methanol oxidation mass activity of Ni/Ni(OH)2-NFs reaches 545 A/cm2 gcat at 0.6 V vs. Ag/AgCl, which is more than five times higher than that of bare-Ni(OH)2. Moreover, Ni/Ni(OH)2-NFs reveal less charge transfer resistance (10.4 Ω), stable oxidation current density (625 A/cm2 gcat at 0.7 V vs. Ag/AgCl), and resistance to the adsorption of reaction intermediates and products during three hours of constant-potential methanol oxidation electrolysis in alkaline solution. The high-performance electrocatalytic activity of Ni/Ni(OH)2 nanoflakes is mainly derived from efficient charge transfer due to the high specific surface area of the 2D mesoporous architecture of the nanoflakes, as well as the mass transport of methanol to Ni2+/Ni3+ active sites throughout the catalyst layer.
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10
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Li H, Wang H, Gao W, Chen Z, Han Y, Zhu X, Tian M. Thickness Dependence of Superconductivity in Layered Topological Superconductor β-PdBi 2. Nanomaterials (Basel) 2021; 11:2826. [PMID: 34835590 PMCID: PMC8618462 DOI: 10.3390/nano11112826] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 10/13/2021] [Accepted: 10/20/2021] [Indexed: 11/16/2022]
Abstract
We report a systematic study on the thickness-dependent superconductivity and transport properties in exfoliated layered topological superconductor β-PdBi2. The superconducting transition temperature Tc is found to decrease with the decreasing thickness. Below a critical thickness of 45 nm, the superconductivity is suppressed, but followed by an abrupt resistance jump near Tc, which is in opposite to the behavior in a superconductor. We attribute suppressed Tc to the enhanced disorder as the thickness decreases. The possible physical mechanisms were discussed for the origination of sharply increased resistance in thinner β-PdBi2 samples.
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Affiliation(s)
- Huijie Li
- Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China; (H.L.); (H.W.)
- Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, HFIPS, Anhui, Chinese Academy of Sciences, Hefei 230031, China; (Z.C.); (Y.H.); (X.Z.); (M.T.)
| | - Huanhuan Wang
- Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China; (H.L.); (H.W.)
| | - Wenshuai Gao
- Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China; (H.L.); (H.W.)
| | - Zheng Chen
- Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, HFIPS, Anhui, Chinese Academy of Sciences, Hefei 230031, China; (Z.C.); (Y.H.); (X.Z.); (M.T.)
- Department of Physics, University of Science and Technology of China, Hefei 230031, China
| | - Yuyan Han
- Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, HFIPS, Anhui, Chinese Academy of Sciences, Hefei 230031, China; (Z.C.); (Y.H.); (X.Z.); (M.T.)
| | - Xiangde Zhu
- Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, HFIPS, Anhui, Chinese Academy of Sciences, Hefei 230031, China; (Z.C.); (Y.H.); (X.Z.); (M.T.)
| | - Mingliang Tian
- Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, HFIPS, Anhui, Chinese Academy of Sciences, Hefei 230031, China; (Z.C.); (Y.H.); (X.Z.); (M.T.)
- School of Physics and Optoelectronic Engineering, Anhui University, Hefei 230601, China
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11
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Abstract
Flat, membrane-like materials made of graphene oxide (GO) nanoflakes have extraordinary mechanical properties including high stiffness, high strength, and low weight. However, the forming of complex nonplanar structures from flat GO membranes is difficult because of the intrinsic brittleness of GO. Here we present a simple and low-cost method to plasticize vacuum-filtrated GO membranes using a cellulose additive. Compared with the pure GO membrane, the GO-cellulose membranes had a lower Young's modulus but significantly improved ductility. Using the flat GO-cellulose membrane, we successfully embossed hemispherical caps with high geometrical fidelity, smooth surfaces, and no tearing or other damages to the membrane. The stiffness of the embossed 3D structure was increased further by cross-linking with a borax solution. Hemispherical caps made of 75 wt % GO with 25 wt % cellulose slurry combining borax cross-linking showed the highest stiffness. This study extends the applications of GO membranes and allows the harnessing of their extraordinary properties to nonplanar structures.
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Affiliation(s)
- Siyu Liu
- Department of Mechanical Engineering, McGill University, 817 Sherbrooke Street West, Montreal, QC H3A 2K6, Canada
| | - Marta Cerruti
- Department of Mining and Materials Engineering, McGill University, 817 Sherbrooke Street West, Montreal, QC H3A 0C5, Canada
| | - Francois Barthelat
- Department of Mechanical Engineering, McGill University, 817 Sherbrooke Street West, Montreal, QC H3A 2K6, Canada
- Department of Mechanical Engineering, University of Colorado, 427 UCB, 1111 Engineering Drive, Boulder, Colorado 80309, United States
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12
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Zhang M, Guo R, Chen K, Wang Y, Niu J, Guo Y, Zhang Y, Yin Z, Xia K, Zhou B, Wang H, He W, Liu J, Sitti M, Zhang Y. Microribbons composed of directionally self-assembled nanoflakes as highly stretchable ionic neural electrodes. Proc Natl Acad Sci U S A 2020; 117:14667-75. [PMID: 32532923 DOI: 10.1073/pnas.2003079117] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Many natural materials possess built-in structural variation, endowing them with superior performance. However, it is challenging to realize programmable structural variation in self-assembled synthetic materials since self-assembly processes usually generate uniform and ordered structures. Here, we report the formation of asymmetric microribbons composed of directionally self-assembled two-dimensional nanoflakes in a polymeric matrix during three-dimensional direct-ink printing. The printed ribbons with embedded structural variations show site-specific variance in their mechanical properties. Remarkably, the ribbons can spontaneously transform into ultrastretchable springs with controllable helical architecture upon stimulation. Such springs also exhibit superior nanoscale transport behavior as nanofluidic ionic conductors under even ultralarge tensile strains (>1,000%). Furthermore, to show possible real-world uses of such materials, we demonstrate in vivo neural recording and stimulation using such springs in a bullfrog animal model. Thus, such springs can be used as neural electrodes compatible with soft and dynamic biological tissues.
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13
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Kim S, Park W, Kim D, Kang J, Lee J, Jang HY, Song SH, Cho B, Lee D. Novel Exfoliation of High-Quality 2H-MoS 2 Nanoflakes for Solution-Processed Photodetector. Nanomaterials (Basel) 2020; 10:nano10061045. [PMID: 32486096 PMCID: PMC7352925 DOI: 10.3390/nano10061045] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Revised: 05/26/2020] [Accepted: 05/27/2020] [Indexed: 11/17/2022]
Abstract
Highly dispersive molybdenum disulfide nanoflakes (MoS2 NFs), without any phase transition during the exfoliation process, are desirable for full utilization of their semiconductor properties in practical applications. Here, we demonstrate an innovate approach for fabricating MoS2 NFs by using hydrazine-assisted ball milling via the synergetic effect of chemical intercalation and mechanical exfoliation. The NFs obtained have a lateral size of 600–800 nm, a thickness less than 3 nm, and high crystallinity in the 2H semiconducting phase. They form a stable dispersion in various solvents, which will be helpful for many applications, due to the oxygen functional group. To investigate production of a two-dimensional (2D) photodetector, 2D semiconducting MoS2, MoS2–p-Si vertical devices were fabricated, and their optical properties were characterized. The photodiode exhibited consistent responses with excellent photo-switching characteristics with wavelengths of 850, 530, and 400 nm.
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Affiliation(s)
- Seulgi Kim
- Department of Advanced Materials Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-Gu, Cheongju 28644, Korea; (S.K.); (W.P.); (D.K.); (J.K.); (J.L.); (H.Y.J.)
| | - Woojin Park
- Department of Advanced Materials Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-Gu, Cheongju 28644, Korea; (S.K.); (W.P.); (D.K.); (J.K.); (J.L.); (H.Y.J.)
| | - Dohoon Kim
- Department of Advanced Materials Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-Gu, Cheongju 28644, Korea; (S.K.); (W.P.); (D.K.); (J.K.); (J.L.); (H.Y.J.)
| | - Jiyeon Kang
- Department of Advanced Materials Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-Gu, Cheongju 28644, Korea; (S.K.); (W.P.); (D.K.); (J.K.); (J.L.); (H.Y.J.)
| | - Jaesoung Lee
- Department of Advanced Materials Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-Gu, Cheongju 28644, Korea; (S.K.); (W.P.); (D.K.); (J.K.); (J.L.); (H.Y.J.)
| | - Hye Yeon Jang
- Department of Advanced Materials Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-Gu, Cheongju 28644, Korea; (S.K.); (W.P.); (D.K.); (J.K.); (J.L.); (H.Y.J.)
| | - Sung Ho Song
- Division of Advanced Materials Engineering, Kongju National University, Kongju, Chungnam 330-717, Korea
- Correspondence: (S.H.S.); (B.C.); (D.L.)
| | - Byungjin Cho
- Department of Advanced Materials Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-Gu, Cheongju 28644, Korea; (S.K.); (W.P.); (D.K.); (J.K.); (J.L.); (H.Y.J.)
- Correspondence: (S.H.S.); (B.C.); (D.L.)
| | - Dongju Lee
- Department of Advanced Materials Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-Gu, Cheongju 28644, Korea; (S.K.); (W.P.); (D.K.); (J.K.); (J.L.); (H.Y.J.)
- Correspondence: (S.H.S.); (B.C.); (D.L.)
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14
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Rao KJ, Korumilli T, KP A, Wacławek S, Černík M, Padil VVT. Development of ZnO Nanoflake Type Structures Using Silk Fibres as Template for Water Pollutants Remediation. Polymers (Basel) 2020; 12:polym12051151. [PMID: 32443444 PMCID: PMC7284581 DOI: 10.3390/polym12051151] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 05/14/2020] [Accepted: 05/15/2020] [Indexed: 11/16/2022] Open
Abstract
We have fabricated ZnO nanoflake structures using degummed silk fibers as templates, via soaking and calcining the silk fibers bearing ZnO nanoparticles at 150 °C for 6 h. The obtained ZnO nanostructures were characterized using scanning electron microscopy (SEM), X-ray diffraction analysis (XRD), and UV-vis and fluorescence spectroscopic analysis. The size (~500–700 nm) in length and thicknesses (~60 nm) of ZnO nanoflakes were produced. The catalysis performances of ZnO nanoflakes on silk fibers (ZnSk) via photo-degradation of naphthalene (93% in 256 min), as well as Rose Bengal dye removal (~1.7 mM g−1) through adsorption from aqueous solution, were practically observed. Further, ZnSk displayed superb antibacterial activity against the tested model gram-negative Escherichia coli bacterium. The produced ZnSk has huge scope to be used for real-world water contaminants remediation applications.
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Affiliation(s)
- K. Jagajjanani Rao
- Department of Biotechnology, Vel Tech Rangarajan Dr.Sagunthala R&D Institute of Science and Technology, Chennai, Tamil Nadu 600062, India;
- Correspondence: (K.J.R.); (M.Č.); (V.V.T.P.); Tel.: +420-723372911 (V.V.T.P.)
| | - Tarangini Korumilli
- Department of Biotechnology, Vel Tech Rangarajan Dr.Sagunthala R&D Institute of Science and Technology, Chennai, Tamil Nadu 600062, India;
| | - Akshaykumar KP
- Tata Institute of Fundamental Research Hyderabad, Hyderabad Sy. No 36/P, Serilingampally Mandal, Hyderabad, Telangana 500107, India;
| | - Stanisław Wacławek
- Department of Nanomaterials in Natural Sciences, Institute for Nanomaterials, Advanced Technologies and Innovation (CXI), Technical University of Liberec (TUL), Studentská 1402/2, 1 461 17 Liberec, Czech Republic;
| | - Miroslav Černík
- Department of Nanomaterials in Natural Sciences, Institute for Nanomaterials, Advanced Technologies and Innovation (CXI), Technical University of Liberec (TUL), Studentská 1402/2, 1 461 17 Liberec, Czech Republic;
- Correspondence: (K.J.R.); (M.Č.); (V.V.T.P.); Tel.: +420-723372911 (V.V.T.P.)
| | - Vinod V. T. Padil
- Department of Nanomaterials in Natural Sciences, Institute for Nanomaterials, Advanced Technologies and Innovation (CXI), Technical University of Liberec (TUL), Studentská 1402/2, 1 461 17 Liberec, Czech Republic;
- Correspondence: (K.J.R.); (M.Č.); (V.V.T.P.); Tel.: +420-723372911 (V.V.T.P.)
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15
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Shimada T, Minaguro K, Xu T, Wang J, Kitamura T. Ab Initio Study of Ferroelectric Critical Size of SnTe Low-Dimensional Nanostructures. Nanomaterials (Basel) 2020; 10:E732. [PMID: 32290527 DOI: 10.3390/nano10040732] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 04/03/2020] [Accepted: 04/08/2020] [Indexed: 11/23/2022]
Abstract
Beyond a ferroelectric critical thickness of several nanometers existed in conventional ferroelectric perovskite oxides, ferroelectricity in ultimately thin dimensions was recently discovered in SnTe monolayers. This discovery suggests the possibility that SnTe can sustain ferroelectricity during further low-dimensional miniaturization. Here, we investigate a ferroelectric critical size of low-dimensional SnTe nanostructures such as nanoribbons (1D) and nanoflakes (0D) using first-principle density-functional theory calculations. We demonstrate that the smallest (one-unit-cell width) SnTe nanoribbon can sustain ferroelectricity and there is no ferroelectric critical size in the SnTe nanoribbons. On the other hand, the SnTe nanoflakes form a vortex of polarization and lose their toroidal ferroelectricity below the surface area of 4 × 4 unit cells (about 25 Å on one side). We also reveal the atomic and electronic mechanism of the absence or presence of critical size in SnTe low-dimensional nanostructures. Our result provides an insight into intrinsic ferroelectric critical size for low-dimensional chalcogenide layered materials.
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16
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Aggrey P, Abdusatorov B, Kan Y, Salimon IA, Lipovskikh SA, Luchkin S, Zhigunov DM, Salimon AI, Korsunsky AM. In Situ Formation of Nanoporous Silicon on a Silicon Wafer via the Magnesiothermic Reduction Reaction (MRR) of Diatomaceous Earth. Nanomaterials (Basel) 2020; 10:E601. [PMID: 32218203 DOI: 10.3390/nano10040601] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 03/16/2020] [Accepted: 03/23/2020] [Indexed: 11/17/2022]
Abstract
Successful direct route production of silicon nanostructures from diatomaceous earth (DE) on a single crystalline silicon wafer via the magnesiothermic reduction reaction is reported. The formed porous coating of 6 µm overall thickness contains silicon as the majority phase along with minor traces of Mg, as evident from SEM-EDS and the Focused Ion Beam (FIB) analysis. Raman peaks of silicon at 519 cm-1 and 925 cm-1 were found in both the film and wafer substrate, and significant intensity variation was observed, consistent with the SEM observation of the directly formed silicon nanoflake layer. Microstructural analysis of the flakes reveals the presence of pores and cavities partially retained from the precursor diatomite powder. A considerable reduction in surface reflectivity was observed for the silicon nanoflakes, from 45% for silicon wafer to below 15%. The results open possibilities for producing nanostructured silicon with a vast range of functionalities.
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17
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Huang H, Deng X, Yan L, Wei G, Zhou W, Liang X, Guo J. One-Step Synthesis of Self-Supported Ni 3S 2/NiS Composite Film on Ni Foam by Electrodeposition for High-Performance Supercapacitors. Nanomaterials (Basel) 2019; 9:nano9121718. [PMID: 31810214 PMCID: PMC6956130 DOI: 10.3390/nano9121718] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Revised: 11/24/2019] [Accepted: 11/26/2019] [Indexed: 11/21/2022]
Abstract
Herein, a facile one-step electrodeposition route was presented for preparing Ni3S2/NiS composite film on Ni foam substrate (denoted as NiSx/NF). The NiSx granular film is composed of mangy interconnected ultra-thin NiSx nanoflakes with porous structures. When applied as electrodes for supercapacitors, the ultra-thin nanoflakes can provide more active sites for redox reaction, and the interconnected porous structure has an advantage for electrolyte ions to penetrate into the inner space of active materials quickly. As expected, the obtained NiSx/NF sample exhibited high gravimetric capacitance of 1649.8 F·g−1 and areal capacitance of 2.63 F·cm−2. Furthermore, a gravimetric capacitance of 1120.1 F·g−1 can be maintained at a high current density of 20 mA·cm−2, suggesting a good rate capability. The influence of the different molar ratios of electrodeposition electrolyte (NiNO3 and thiourea) on the morphology and electrochemical properties of NiSx/NF sample was investigated to provide an optimum route for one-step electrodeposition of Ni3S2/NiS composite film. The outstanding performance indicated the Ni3S2/NiS composite film on Ni foam has great potential as an electrode material for supercapacitors.
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Affiliation(s)
- Haifu Huang
- Guangxi Novel Battery Materials Research Center of Engineering Technology, Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology, Guangxi Key Laboratory for Relativistic Astrophysics, Center on Nanoenergy Research, School of Physics Science and Technology, Guangxi University, Nanning 530004, China; (X.D.); (L.Y.); (G.W.); (W.Z.); (X.L.); (J.G.)
- Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured Materials, Guangxi University, Nanning 530004, China
- Correspondence:
| | - Xiaoli Deng
- Guangxi Novel Battery Materials Research Center of Engineering Technology, Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology, Guangxi Key Laboratory for Relativistic Astrophysics, Center on Nanoenergy Research, School of Physics Science and Technology, Guangxi University, Nanning 530004, China; (X.D.); (L.Y.); (G.W.); (W.Z.); (X.L.); (J.G.)
| | - Liqing Yan
- Guangxi Novel Battery Materials Research Center of Engineering Technology, Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology, Guangxi Key Laboratory for Relativistic Astrophysics, Center on Nanoenergy Research, School of Physics Science and Technology, Guangxi University, Nanning 530004, China; (X.D.); (L.Y.); (G.W.); (W.Z.); (X.L.); (J.G.)
| | - Geng Wei
- Guangxi Novel Battery Materials Research Center of Engineering Technology, Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology, Guangxi Key Laboratory for Relativistic Astrophysics, Center on Nanoenergy Research, School of Physics Science and Technology, Guangxi University, Nanning 530004, China; (X.D.); (L.Y.); (G.W.); (W.Z.); (X.L.); (J.G.)
| | - Wenzheng Zhou
- Guangxi Novel Battery Materials Research Center of Engineering Technology, Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology, Guangxi Key Laboratory for Relativistic Astrophysics, Center on Nanoenergy Research, School of Physics Science and Technology, Guangxi University, Nanning 530004, China; (X.D.); (L.Y.); (G.W.); (W.Z.); (X.L.); (J.G.)
- Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured Materials, Guangxi University, Nanning 530004, China
| | - Xianqing Liang
- Guangxi Novel Battery Materials Research Center of Engineering Technology, Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology, Guangxi Key Laboratory for Relativistic Astrophysics, Center on Nanoenergy Research, School of Physics Science and Technology, Guangxi University, Nanning 530004, China; (X.D.); (L.Y.); (G.W.); (W.Z.); (X.L.); (J.G.)
- Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured Materials, Guangxi University, Nanning 530004, China
| | - Jin Guo
- Guangxi Novel Battery Materials Research Center of Engineering Technology, Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology, Guangxi Key Laboratory for Relativistic Astrophysics, Center on Nanoenergy Research, School of Physics Science and Technology, Guangxi University, Nanning 530004, China; (X.D.); (L.Y.); (G.W.); (W.Z.); (X.L.); (J.G.)
- Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured Materials, Guangxi University, Nanning 530004, China
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18
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Shi HL, Zou B, Li ZA, Luo MT, Wang WZ. Direct observation of oxygen-vacancy formation and structural changes in Bi 2WO 6 nanoflakes induced by electron irradiation. Beilstein J Nanotechnol 2019; 10:1434-1442. [PMID: 31431855 PMCID: PMC6664412 DOI: 10.3762/bjnano.10.141] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Accepted: 07/01/2019] [Indexed: 05/31/2023]
Abstract
The prominent role of oxygen vacancies in the photocatalytic performance of bismuth tungsten oxides is well recognized, while the underlying formation mechanisms remain poorly understood. Here, we use the transmission electron microscopy to investigate the formation of oxygen vacancies and the structural evolution of Bi2WO6 under in situ electron irradiation. Our experimental results reveal that under 200 keV electron irradiation, the breaking of relatively weak Bi-O bonds leads to the formation of oxygen vacancies in Bi2WO6. With prolonged electron irradiation, the reduced Bi cations tend to form Bi clusters on the nanoflake surfaces, and the oxygen atoms are released from the nanoflakes, while the W-O networks reconstruct to form WO3. A possible mechanism that accounts for the observed processes of Bi cluster formation and oxygen release under energetic electron irradiation is also discussed.
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Affiliation(s)
- Hong-long Shi
- School of Science, Minzu University of China, Beijing 100081, People’s Republic of China, Tel. +861068930809
| | - Bin Zou
- School of Science, Minzu University of China, Beijing 100081, People’s Republic of China, Tel. +861068930809
| | - Zi-an Li
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China, Tel. +861082648001
| | - Min-ting Luo
- The National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China, Tel. +861082544809
| | - Wen-zhong Wang
- School of Science, Minzu University of China, Beijing 100081, People’s Republic of China, Tel. +861068930809
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19
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Gazibegovic S, Badawy G, Buckers TLJ, Leubner P, Shen J, de Vries FK, Koelling S, Kouwenhoven LP, Verheijen MA, Bakkers EPAM. Bottom-Up Grown 2D InSb Nanostructures. Adv Mater 2019; 31:e1808181. [PMID: 30779385 DOI: 10.1002/adma.201808181] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 01/31/2019] [Indexed: 06/09/2023]
Abstract
Low-dimensional high-quality InSb materials are promising candidates for next-generation quantum devices due to the high carrier mobility, low effective mass, and large g-factor of the heavy element compound InSb. Various quantum phenomena are demonstrated in InSb 2D electron gases and nanowires. A combination of the best features of these two systems (pristine nanoscale and flexible design) is desirable to realize, e.g., the multiterminal topological Josephson device. Here, controlled growth of 2D nanostructures, nanoflakes, on an InSb platform is demonstrated. An assembly of nanoflakes with various dimensions and morphologies, thinner than the Bohr radius of InSb, are fabricated. Importantly, the growth of either nanowires or nanoflakes can be enforced experimentally by setting growth and substrate design parameters properly. Hall bar measurements on the nanostructures yield mobilities up to ≈20 000 cm2 V-1 s-1 and detect quantum Hall plateaus. This allows to see the system as a viable nanoscale 2D platform for future quantum devices.
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Affiliation(s)
- Sasa Gazibegovic
- Department of Applied Physics, Eindhoven University of Technology, 5600, MB, Eindhoven, The Netherlands
- QuTech and Kavli Institute of NanoScience, Delft University of Technology, 2600, GA, Delft, The Netherlands
| | - Ghada Badawy
- Department of Applied Physics, Eindhoven University of Technology, 5600, MB, Eindhoven, The Netherlands
| | - Thijs L J Buckers
- Department of Applied Physics, Eindhoven University of Technology, 5600, MB, Eindhoven, The Netherlands
| | - Philipp Leubner
- Department of Applied Physics, Eindhoven University of Technology, 5600, MB, Eindhoven, The Netherlands
- QuTech and Kavli Institute of NanoScience, Delft University of Technology, 2600, GA, Delft, The Netherlands
| | - Jie Shen
- QuTech and Kavli Institute of NanoScience, Delft University of Technology, 2600, GA, Delft, The Netherlands
| | - Folkert K de Vries
- QuTech and Kavli Institute of NanoScience, Delft University of Technology, 2600, GA, Delft, The Netherlands
| | - Sebastian Koelling
- Department of Applied Physics, Eindhoven University of Technology, 5600, MB, Eindhoven, The Netherlands
| | - Leo P Kouwenhoven
- QuTech and Kavli Institute of NanoScience, Delft University of Technology, 2600, GA, Delft, The Netherlands
- Microsoft Quantum Lab Delft, Delft University of Technology, 2600, GA, Delft, The Netherlands
| | - Marcel A Verheijen
- Department of Applied Physics, Eindhoven University of Technology, 5600, MB, Eindhoven, The Netherlands
- Eurofins Material Science Netherlands B.V., High Tech Campus, 5656, AE, Eindhoven, The Netherlands
| | - Erik P A M Bakkers
- Department of Applied Physics, Eindhoven University of Technology, 5600, MB, Eindhoven, The Netherlands
- QuTech and Kavli Institute of NanoScience, Delft University of Technology, 2600, GA, Delft, The Netherlands
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20
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Rakibuddin M, Kim H. Reduced graphene oxide supported C 3N 4 nanoflakes and quantum dots as metal-free catalysts for visible light assisted CO 2 reduction. Beilstein J Nanotechnol 2019; 10:448-458. [PMID: 30873315 PMCID: PMC6404395 DOI: 10.3762/bjnano.10.44] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Accepted: 01/21/2019] [Indexed: 06/09/2023]
Abstract
The visible light photocatalytic reduction of CO2 to fuel is crucial for the sustainable development of energy resources. In our present work, we report the synthesis of novel reduced graphene oxide (rGO)-supported C3N4 nanoflake (NF) and quantum dot (QD) hybrid materials (GCN) for visible light induced reduction of CO2. The C3N4 NFs and QDs are prepared by acid treatment of C3N4 nanosheets followed by ultrasonication and hydrothermal heating at 130-190 °C for 5-20 h. It is observed that hydrothermal exposure of acid-treated graphitic carbon nitride (g-C3N4) nanosheets at low temperature generated larger NFs, whereas QDs are formed at higher temperatures. The formation of GCN hybrid materials was confirmed by powder X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, transmission electron microscopy (TEM), and UV-vis spectroscopy. High-resolution TEM images clearly show that C3N4 QDs (average diameter of 2-3 nm) and NFs (≈20-45 nm) are distributed on the rGO surface within the GCN hybrid material. Among the as-prepared GCN hybrid materials, GCN-5 QDs exhibit excellent CO2 reductive activity for the generation of formaldehyde, HCHO (10.3 mmol h-1 g-1). Therefore, utilization of metal-free carbon-based GCN hybrid materials could be very promising for CO2 photoreduction because of their excellent activity and environmental sustainability.
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Affiliation(s)
- Md Rakibuddin
- School of Materials Science and Engineering, Yeungnam University, Gyeongsan, Republic of Korea
| | - Haekyoung Kim
- School of Materials Science and Engineering, Yeungnam University, Gyeongsan, Republic of Korea
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21
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Ranathunge TA, Karunaratne DGGP, Rajapakse RMG, Watkins DL. Doxorubicin Loaded Magnesium Oxide Nanoflakes as pH Dependent Carriers for Simultaneous Treatment of Cancer and Hypomagnesemia. Nanomaterials (Basel) 2019; 9:E208. [PMID: 30736270 PMCID: PMC6409820 DOI: 10.3390/nano9020208] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 01/26/2019] [Accepted: 02/01/2019] [Indexed: 11/30/2022]
Abstract
Doxorubicin (DOX) is an anticancer drug commonly used in treating cancer; however, it has severe cytotoxicity effects. To overcome both the adverse effects of the drug and mineral deficiency (i.e., hypomagnesemia) experienced by cancer patients, we have developed magnesium oxide (MgO) nanoflakes as drug carriers and loaded them with DOX for use as a targeted drug delivery (TDD) system for potential application in cancer therapy. The synthesis employed herein affords pure, highly porous MgO nanoparticles that are void of the potentially harmful metal contaminants often discussed in the literature. Purposed for dual therapy, the nanoparticles exhibit an impressive 90% drug loading capacity with pH dependent drug releasing rates of 10% at pH 7.2, 50.5% at pH 5.0, and 90.2% at pH 3. Results indicate that therapy is achievable via slow diffusion where MgO nanoflakes degrade (i.e., dissolve) under acidic conditions releasing the drug and magnesium ions to the cancerous region. The TDD system therefore minimizes cytotoxicity to healthy cells while supplying magnesium ions to overcome hypomagnesemia.
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Affiliation(s)
- Tharindu A Ranathunge
- Department of Chemistry, University of Peradeniya, Kandy 20400, Sri Lanka.
- Department of Chemical and Processing Engineering, University of Peradeniya, Kandy 20400, Sri Lanka.
- Postgraduate Institute of Science, University of Peradeniya, Kandy 20400, Sri Lanka.
- Department of Chemistry and Biochemistry, The University of Mississippi, University, MS 38677, USA.
| | - D G G P Karunaratne
- Department of Chemical and Processing Engineering, University of Peradeniya, Kandy 20400, Sri Lanka.
- Postgraduate Institute of Science, University of Peradeniya, Kandy 20400, Sri Lanka.
| | - R M G Rajapakse
- Department of Chemistry, University of Peradeniya, Kandy 20400, Sri Lanka.
- Postgraduate Institute of Science, University of Peradeniya, Kandy 20400, Sri Lanka.
- Department of Chemistry and Biochemistry, The University of Mississippi, University, MS 38677, USA.
| | - Davita L Watkins
- Department of Chemistry and Biochemistry, The University of Mississippi, University, MS 38677, USA.
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22
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Azhar A, Young C, Kaneti YV, Yamauchi Y, Badjah AY, Naushad M, Habila M, Wabaidur S, Alothman ZA, Kim J. Cyano-Bridged Cu-Ni Coordination Polymer Nanoflakes and Their Thermal Conversion to Mixed Cu-Ni Oxides. Nanomaterials (Basel) 2018; 8:nano8120968. [PMID: 30477166 PMCID: PMC6315628 DOI: 10.3390/nano8120968] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 11/10/2018] [Accepted: 11/14/2018] [Indexed: 11/16/2022]
Abstract
Herein, we demonstrate the bottom-up synthesis of 2D cyano-bridged Cu-Ni coordination polymer (CP) nanoflakes through a controlled crystallization process and their conversion to Cu-Ni mixed oxides via a thermal treatment in air. The chelating effect of citrate anions effectively prevents the rapid coordination reaction between Cu2+ and K₂[Ni(CN)₄], resulting in the deceleration of the crystallization process of CPs. Specifically, with addition of trisodium citrate dehydrate, the number of nuclei formed at the early stage of the reaction is decreased. Less nuclei undergo a crystal growth by interacting with [Ni(CN)₄]2-, leading to the formation of larger Cu-Ni CP nanoflakes. Following heat treatment in air, the -CN- groups present within the CP nanoflakes are removed and nanoporous Cu-Ni mixed oxide nanoflakes are generated. When tested as an electrode material for supercapacitors using a three-electrode system, the optimum Cu-Ni mixed oxide sample shows a maximum specific capacitance of 158 F g-1 at a current density of 1 A g-1. It is expected that the proposed method will be useful for the preparation of other types of 2D and 3D CPs as precursors for the creation of various nanoporous metal oxides.
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Affiliation(s)
- Alowasheeir Azhar
- Key Laboratory of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
- International Research Center for Materials Nanoarchitechtonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
- Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan.
| | - Christine Young
- International Research Center for Materials Nanoarchitechtonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
| | - Yusuf Valentino Kaneti
- International Research Center for Materials Nanoarchitechtonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
| | - Yusuke Yamauchi
- Key Laboratory of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
- School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, QLD 4072, Australia.
- Department of Plant & Environmental New Resources, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Korea.
| | - Ahmad Yacine Badjah
- Advanced Material Research Chair, Chemistry Department P.O. Box 2455, College of Science, King Saud University (KSU), Riyadh 11451, Saudi Arabia.
| | - Mu Naushad
- Advanced Material Research Chair, Chemistry Department P.O. Box 2455, College of Science, King Saud University (KSU), Riyadh 11451, Saudi Arabia.
| | - Mohamed Habila
- Advanced Material Research Chair, Chemistry Department P.O. Box 2455, College of Science, King Saud University (KSU), Riyadh 11451, Saudi Arabia.
| | - Saikh Wabaidur
- Advanced Material Research Chair, Chemistry Department P.O. Box 2455, College of Science, King Saud University (KSU), Riyadh 11451, Saudi Arabia.
| | - Zeid A Alothman
- Advanced Material Research Chair, Chemistry Department P.O. Box 2455, College of Science, King Saud University (KSU), Riyadh 11451, Saudi Arabia.
| | - Jeonghun Kim
- Key Laboratory of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
- School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, QLD 4072, Australia.
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Kang MA, Han JK, Cho SY, Bu SD, Park CY, Myung S, Song W, Lee SS, Lim J, An KS. Strain-Gradient Effect in Gas Sensors Based on Three-Dimensional Hollow Molybdenum Disulfide Nanoflakes. ACS Appl Mater Interfaces 2017; 9:43799-43806. [PMID: 29188715 DOI: 10.1021/acsami.7b14262] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A novel three-dimensional transition metal dichalcogenide (TMD) structure consisting of seamless hollow nanoflakes on two-dimensional basal layers was synthesized by a one-step chemical vapor deposition method. Here, we demonstrate that the as-grown nanoflakes are formed on an organic promoter layer which served as a positive template and are swollen at the grain boundaries by the bubbling effect. TMD nanosheets with hollow nanoflakes are successfully applied as chemical sensors, and it was found that their gas adsorption property is strongly related to the internal strain gradient resulting from the variation in the lattice parameter. This result is consistent with the theoretical prediction in previous studies. Our chemical vapor deposition-based approach is an efficient way to generate TMD-based nanostructures over a large surface area for various practical applications such as chemical sensors.
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Affiliation(s)
- Min-A Kang
- Thin Film Materials Research Center, Korea Research Institute of Chemical Technology , Daejeon 305-600, Republic of Korea
| | - Jin Kyu Han
- Thin Film Materials Research Center, Korea Research Institute of Chemical Technology , Daejeon 305-600, Republic of Korea
| | - Sam Yeon Cho
- Department of Physics, Chonbuk National University , Jeonju 561-756, Republic of Korea
| | - Sang Don Bu
- Department of Physics, Chonbuk National University , Jeonju 561-756, Republic of Korea
| | | | - Sung Myung
- Thin Film Materials Research Center, Korea Research Institute of Chemical Technology , Daejeon 305-600, Republic of Korea
| | - Wooseok Song
- Thin Film Materials Research Center, Korea Research Institute of Chemical Technology , Daejeon 305-600, Republic of Korea
| | - Sun Sook Lee
- Thin Film Materials Research Center, Korea Research Institute of Chemical Technology , Daejeon 305-600, Republic of Korea
| | - Jongsun Lim
- Thin Film Materials Research Center, Korea Research Institute of Chemical Technology , Daejeon 305-600, Republic of Korea
| | - Ki-Seok An
- Thin Film Materials Research Center, Korea Research Institute of Chemical Technology , Daejeon 305-600, Republic of Korea
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24
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Zhang C, Wu D, Shi L, Zhu Y, Xiong D, Xu S, Huang R, Qi R, Zhang W, Wang L, Chu PK. Manganese molybdate nanoflakes on silicon microchannel plates as novel nano energetic material. R Soc Open Sci 2017; 4:171229. [PMID: 29308255 PMCID: PMC5750022 DOI: 10.1098/rsos.171229] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Accepted: 11/08/2017] [Indexed: 06/07/2023]
Abstract
Nano energetic materials have attracted great attention recently owing to their potential applications for both civilian and military purposes. By introducing silicon microchannel plates (Si-MCPs) three-dimensional (3D)-ordered structures, monocrystalline MnMoO4 with a size of tens of micrometres and polycrystalline MnMoO4 nanoflakes are produced on the surface and sidewall of nickel-coated Si-MCP, respectively. The MnMoO4 crystals ripen controllably forming polycrystalline nanoflakes with lattice fringes of 0.542 nm corresponding to the [Formula: see text] plane on the sidewall. And these MnMoO4 nanoflakes show apparent thermite performance which is rarely reported and represents MnMoO4 becoming a new category of energetic materials after nanocrystallization. Additionally, the nanocrystallization mechanism is interpreted by ionic diffusion caused by 3D structure. The results indicate that the Si-MCP is a promising substrate for nanocrystallization of energetic materials such as MnMoO4.
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Affiliation(s)
- Chi Zhang
- Key Laboratory of Polar Materials and Devices, Ministry of Education, and Department of Electronic Engineering, East China Normal University, Shanghai 200241, People's Republic of China
- Shanghai Key Laboratory of Multidimensional Information Processing, East China Normal University, Shanghai 200241, People's Republic of China
| | - Dajun Wu
- Key Laboratory of Polar Materials and Devices, Ministry of Education, and Department of Electronic Engineering, East China Normal University, Shanghai 200241, People's Republic of China
- School of Physics and Electronic Engineering, Changshu Institute of Technology, Suzhou 215500, People's Republic of China
| | - Liming Shi
- School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China
| | - Yiping Zhu
- Key Laboratory of Polar Materials and Devices, Ministry of Education, and Department of Electronic Engineering, East China Normal University, Shanghai 200241, People's Republic of China
- Shanghai Key Laboratory of Multidimensional Information Processing, East China Normal University, Shanghai 200241, People's Republic of China
| | - Dayuan Xiong
- Key Laboratory of Polar Materials and Devices, Ministry of Education, and Department of Electronic Engineering, East China Normal University, Shanghai 200241, People's Republic of China
- Shanghai Key Laboratory of Multidimensional Information Processing, East China Normal University, Shanghai 200241, People's Republic of China
| | - Shaohui Xu
- Key Laboratory of Polar Materials and Devices, Ministry of Education, and Department of Electronic Engineering, East China Normal University, Shanghai 200241, People's Republic of China
| | - Rong Huang
- Key Laboratory of Polar Materials and Devices, Ministry of Education, and Department of Electronic Engineering, East China Normal University, Shanghai 200241, People's Republic of China
| | - Ruijuan Qi
- Key Laboratory of Polar Materials and Devices, Ministry of Education, and Department of Electronic Engineering, East China Normal University, Shanghai 200241, People's Republic of China
| | - Wenchao Zhang
- School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China
| | - Lianwei Wang
- Key Laboratory of Polar Materials and Devices, Ministry of Education, and Department of Electronic Engineering, East China Normal University, Shanghai 200241, People's Republic of China
- Shanghai Key Laboratory of Multidimensional Information Processing, East China Normal University, Shanghai 200241, People's Republic of China
- Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People's Republic of China
| | - Paul K. Chu
- Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People's Republic of China
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Brown S, El‐Shall H, Lee Y. A One-Step Approach to the Synthesis of High Aspect Ratio Titania Nanoflakes. Glob Chall 2017; 1:1700060. [PMID: 31565293 PMCID: PMC6607181 DOI: 10.1002/gch2.201700060] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 08/28/2017] [Indexed: 05/24/2023]
Abstract
High aspect ratio TiO2 nanoflakes are synthesized by a one-step modified surface hydrolysis method. Surface morphology and physical dimensions are characterized using scanning electron microscopy, laser diffraction analysis, and transmission electron microscopy. Microsized flakes having a thickness ≈40 nm are successfully synthesized by spreading an oil phase consisting of titanium tetraisopropoxide and a low surface tension hydrocarbon on the surface of water. Pure anatase phase crystalline titania nanoflakes are obtained by calcining at 400 °C without changing the shape and thickness of flakes. Relatively higher specific surface area (2-6 times) and less crystal defects enhance photocatalytic activities of nanoflakes due to more surface reaction sites and the suppression of fast recombination. By performing dye degradation under ultraviolet illumination, titania nanoflakes exhibit the higher photocatalytic efficiency over the commercial photocatalyst, Degussa P25. As far as it is known, this method is the most efficient and cost effective process for making low-dimensional nanomaterials in a continuous manner. These titania flakes can be easily separated from the treated water by simply sedimentation or filtration and therefore is very suitable for water purification application.
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Affiliation(s)
- Scott Brown
- 205 Particle Science & TechnologyUniversity of FloridaGainesvilleFL32611USA
| | - Hassan El‐Shall
- 205 Particle Science & TechnologyUniversity of FloridaGainesvilleFL32611USA
| | - Yang‐Yao Lee
- 205 Particle Science & TechnologyUniversity of FloridaGainesvilleFL32611USA
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26
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Huang H, Huang J, Liu W, Fang Y, Liu Y. Ultradispersed and Single-Layered MoS 2 Nanoflakes Strongly Coupled with Graphene: An Optimized Structure with High Kinetics for the Hydrogen Evolution Reaction. ACS Appl Mater Interfaces 2017; 9:39380-39390. [PMID: 29057644 DOI: 10.1021/acsami.7b12038] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
As one of the most promising Pt alternatives for cost-effective hydrogen production, molybdenum disulfide (MoS2), although has been studied extensively to improve its electrocatalytic activity, suffers from scarce active sites, low conductivity, and lack of interaction with substrates. To this end, we anchor ultradispersed and single-layered MoS2 nanoflakes on graphene sheets via a hybrid intermediate (MoOx-cysteine-graphene oxide), which not only confines the subsequent growth of MoS2 on the graphene surface but also ensures the intimate interaction between Mo species and graphene at the initial stage. Mo-O-C bond and a possible residual MoO3-x layer are proposed to comprise the interface bridging the two inherent incompatible phases, MoS2 and graphene. This strongly coupled structure together with the highly exposed MoS2 morphology accelerates the electron injection from graphene to the active sites of MoS2, and thus the hydrogen evolution reaction (HER) can achieve an overpotential of ∼275 mV at ∼-740 mA cm-2, and a Pt-like Tafel slope of ∼35 mV dec-1. Our results shed light on the indispensable role of interfacial interaction within semiconducting material-nanocarbon composites and provide a new insight into the actual activity of MoS2 toward the HER.
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Affiliation(s)
- Haoliang Huang
- College of Materials and Energy, South China Agricultural University , Guangzhou 510642, China
- Department of Chemistry, University of Southampton , University Road, Southampton SO17 1BJ, U.K
| | - Junying Huang
- College of Materials and Energy, South China Agricultural University , Guangzhou 510642, China
| | - Weipeng Liu
- College of Materials and Energy, South China Agricultural University , Guangzhou 510642, China
| | - Yueping Fang
- College of Materials and Energy, South China Agricultural University , Guangzhou 510642, China
| | - Yingju Liu
- College of Materials and Energy, South China Agricultural University , Guangzhou 510642, China
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27
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Mohan Kumar G, Fu X, Ilanchezhiyan P, Yuldashev SU, Lee DJ, Cho HD, Kang TW. Highly Sensitive Flexible Photodetectors Based on Self-Assembled Tin Monosulfide Nanoflakes with Graphene Electrodes. ACS Appl Mater Interfaces 2017; 9:32142-32150. [PMID: 28853280 DOI: 10.1021/acsami.7b09959] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Tin monosulfide (SnS) nanostructures have attracted huge attention recently because of their high absorption coefficient, high photoconversion efficiencies, low energy cost, ease of deposition, and so on. Here, in this paper, we report on the low-cost hydrothermal synthesis of the self-assembled SnS nanoflake-like structures in terms of performance for the photodetectors. High-performance photodetectors were fabricated using SnS nanoflakes as active layers and graphene as the lateral electrodes. The SnS photodetectors exhibited excellent photoresponse properties with a high responsivity of 1.7 × 104 A/W and have fast response and recovery times. In addition, the photodetectors exhibited long-term stability and strong dependence of photocurrent on light intensity. These excellent characteristics were attributed to the larger surface-to-volume ratio of the self-assembled SnS nanoflakes and the effective separation of the photogenerated carriers at graphene/SnS interfaces. Additionally, a flexible photodetector based on SnS nanoflakes was also fabricated on a flexible substrate that demonstrated similar photosensitive properties. Furthermore, this study also demonstrates the potential of hydrothermal-processed SnS nanoflakes for high-performance photodetectors and their application in flexible low-cost optoelectronic devices.
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Affiliation(s)
- Ganesan Mohan Kumar
- Nano-Information Technology Academy (NITA) and ‡Quantum-Functional Semiconductor Research Center, Dongguk University , Seoul 04620, Republic of Korea
| | - Xiao Fu
- Nano-Information Technology Academy (NITA) and ‡Quantum-Functional Semiconductor Research Center, Dongguk University , Seoul 04620, Republic of Korea
| | - Pugazhendi Ilanchezhiyan
- Nano-Information Technology Academy (NITA) and ‡Quantum-Functional Semiconductor Research Center, Dongguk University , Seoul 04620, Republic of Korea
| | - Shavkat U Yuldashev
- Nano-Information Technology Academy (NITA) and ‡Quantum-Functional Semiconductor Research Center, Dongguk University , Seoul 04620, Republic of Korea
| | - Dong Jin Lee
- Nano-Information Technology Academy (NITA) and ‡Quantum-Functional Semiconductor Research Center, Dongguk University , Seoul 04620, Republic of Korea
| | - Hak Dong Cho
- Nano-Information Technology Academy (NITA) and ‡Quantum-Functional Semiconductor Research Center, Dongguk University , Seoul 04620, Republic of Korea
| | - Tae Won Kang
- Nano-Information Technology Academy (NITA) and ‡Quantum-Functional Semiconductor Research Center, Dongguk University , Seoul 04620, Republic of Korea
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28
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Salili SM, Worden M, Nemati A, Miller DW, Hegmann T. Synthesis of Distinct Iron Oxide Nanomaterial Shapes Using Lyotropic Liquid Crystal Solvents. Nanomaterials (Basel) 2017; 7:E211. [PMID: 28767058 PMCID: PMC5575693 DOI: 10.3390/nano7080211] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Revised: 07/28/2017] [Accepted: 07/30/2017] [Indexed: 12/20/2022]
Abstract
A room temperature reduction-hydrolysis of Fe(III) precursors such as FeCl₃ or Fe(acac)₃ in various lyotropic liquid crystal phases (lamellar, hexagonal columnar, or micellar) formed by a range of ionic or neutral surfactants in H₂O is shown to be an effective and mild approach for the preparation of iron oxide (IO) nanomaterials with several morphologies (shapes and dimensions), such as extended thin nanosheets with lateral dimensions of several hundred nanometers as well as smaller nanoflakes and nanodiscs in the tens of nanometers size regime. We will discuss the role of the used surfactants and lyotropic liquid crystal phases as well as the shape and size differences depending upon when and how the resulting nanomaterials were isolated from the reaction mixture. The presented synthetic methodology using lyotropic liquid crystal solvents should be widely applicable to several other transition metal oxides for which the described reduction-hydrolysis reaction sequence is a suitable pathway to obtain nanoscale particles.
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Affiliation(s)
- Seyyed Muhammad Salili
- Chemical Physics Interdisciplinary Program, Liquid Crystal Institute, Kent State University, Kent, OH 44242-0001, USA.
| | - Matthew Worden
- Department of Chemistry and Biochemistry, Kent State University, Kent, OH 44242-0001, USA.
| | - Ahlam Nemati
- Chemical Physics Interdisciplinary Program, Liquid Crystal Institute, Kent State University, Kent, OH 44242-0001, USA.
| | - Donald W Miller
- Department of Pharmacology and Therapeutics, University of Manitoba, Winnipeg, MB R3E 0T6, Canada.
| | - Torsten Hegmann
- Chemical Physics Interdisciplinary Program, Liquid Crystal Institute, Kent State University, Kent, OH 44242-0001, USA.
- Department of Chemistry and Biochemistry, Kent State University, Kent, OH 44242-0001, USA.
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29
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Pei C, Xiong F, Sheng J, Yin Y, Tan S, Wang D, Han C, An Q, Mai L. VO 2 Nanoflakes as the Cathode Material of Hybrid Magnesium-Lithium-Ion Batteries with High Energy Density. ACS Appl Mater Interfaces 2017; 9:17060-17066. [PMID: 28467043 DOI: 10.1021/acsami.7b02480] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The hybrid magnesium-lithium-ion batteries (MLIBs) combining the dendrite-free deposition of the Mg anode and the fast Li intercalation cathode are better alternatives to Li-ion batteries (LIBs) in large-scale power storage systems. In this article, we reported hybrid MLIBs assembled with the VO2 cathode, dendrite-free Mg anode, and the Mg-Li dual-salt electrolyte. Satisfactorily, the VO2 cathode delivered a stable plateau at about 1.75 V, and a high specific discharge capacity of 244.4 mA h g-1. To the best of our knowledge, the VO2 cathode displays the highest energy density of 427 Wh kg-1 among reported MLIBs in coin-type batteries. In addition, an excellent rate performance and a wide operating temperature window from 0 to 55 °C have been obtained. The combination of VO2 cathode, dual-salt electrolyte, and Mg anode would pave the way for the development of high energy density, safe, and low-cost batteries.
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Affiliation(s)
- Cunyuan Pei
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , Hubei, Wuhan 430070, China
| | - Fangyu Xiong
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , Hubei, Wuhan 430070, China
| | - Jinzhi Sheng
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , Hubei, Wuhan 430070, China
| | - Yameng Yin
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , Hubei, Wuhan 430070, China
| | - Shuangshuang Tan
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , Hubei, Wuhan 430070, China
| | - Dandan Wang
- Department of Materials Science and Engineering, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Chunhua Han
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , Hubei, Wuhan 430070, China
| | - Qinyou An
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , Hubei, Wuhan 430070, China
| | - Liqiang Mai
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , Hubei, Wuhan 430070, China
- Department of Chemistry, University of California , Berkeley, California 94720, United States
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Liu XH, Yin PF, Kulinich SA, Zhou YZ, Mao J, Ling T, Du XW. Arrays of Ultrathin CdS Nanoflakes with High-Energy Surface for Efficient Gas Detection. ACS Appl Mater Interfaces 2017; 9:602-609. [PMID: 27981834 DOI: 10.1021/acsami.6b13601] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
It is fascinating and challenging to endow conventional materials with unprecedented properties. For instance, cadmium sulfide (CdS) is an important semiconductor with excellent light response; however, its potential in gas-sensing was underestimated owing to relatively low chemical activity and poor electrical conductivity. Herein, we demonstrate that an ideal architecture, ultrathin nanoflake arrays (NFAs), can improve significantly gas-sensing properties of CdS material. The CdS NFAs are grown directly on the interdigitated electrode to expose large surface area. Their thickness is reduced below the double Debye length of CdS, permitting to achieve a full depletion of carriers. Particularly, the prepared CdS nanoflakes are enclosed with high-energy {0001} facets exposed, which provides more active sites for gas adsorption. Moreover, the NFAs exhibit the light-trapping effect, which further enhances their gas sensitivity. As a result, the as-prepared CdS NFAs demonstrate excellent gas-sensing and light-response properties, thus being capable of dual gas and light detection.
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Affiliation(s)
| | | | - Sergei A Kulinich
- Institute of Innovative Science and Technology, Tokai University , 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan
- Aston Institute of Photonic Technologies, Aston University , Aston Triangle, Birmingham B4 7ET, United Kingdom
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31
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Deka Boruah B, Misra A. Energy-Efficient Hydrogenated Zinc Oxide Nanoflakes for High-Performance Self-Powered Ultraviolet Photodetector. ACS Appl Mater Interfaces 2016; 8:18182-8. [PMID: 27352008 DOI: 10.1021/acsami.6b04954] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Light absorption efficiency and doping induced charge carrier density play a vital role in self-powered optoelectronic devices. Unique vanadium-doped zinc oxide nanoflake array (VZnO NFs) is fabricated for self-powered ultraviolet (UV) photodetection. The light harvesting efficiency drastically improved from 84% in ZnO NRs to 98% in VZnO NFs. Moreover, the hydrogenation of as-synthesized VZnO (H:VZnO) NFs displayed an outstanding increase in response current as compared to pristine structures. The H:VZnO NFs device presents an extraordinary photoelastic behavior with faster photodetection speed in the order of ms under a low UV illumination signal. Excellent responsivity and external quantum efficiency with larger value of specific detectivity of H:VZnO NFs device promises an outstanding sensitivity for UV signal and self-powered high-performance visible-blind photodetector.
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Affiliation(s)
- Buddha Deka Boruah
- Department of Instrumentation and Applied Physics, Indian Institute of Science , Bangalore, Karnataka, India 560012
| | - Abha Misra
- Department of Instrumentation and Applied Physics, Indian Institute of Science , Bangalore, Karnataka, India 560012
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32
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Ye W, Chen F, Zhao F, Han N, Li Y. CuWO4 Nanoflake Array-Based Single-Junction and Heterojunction Photoanodes for Photoelectrochemical Water Oxidation. ACS Appl Mater Interfaces 2016; 8:9211-9217. [PMID: 27011376 DOI: 10.1021/acsami.6b03176] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Over recent years, tremendous efforts have been invested in the search and development of active and durable semiconductor materials for photoelectrochemical (PEC) water splitting, particularly for photoanodes operating under a highly oxidizing environment. CuWO4 is an emerging candidate with suitable band gap and high chemical stability. Nevertheless, its overall solar-to-electricity remains low because of the inefficient charge separation process. In this work, we demonstrate that this problem can be partly alleviated through designing three-dimensional hierarchical nanostructures. CuWO4 nanoflake arrays on conducting glass are prepared from the chemical conversion of WO3 templates. Resulting electrode materials possess large surface areas, abundant porosity and small thickness. Under illumination, our CuWO4 nanoflake array photoanodes exhibit an anodic current density of ∼0.4 mA/cm(2) at the thermodynamic potential of water splitting in pH 9.5 potassium borate buffer--the largest value among all available CuWO4-based photoanodes. In addition, we demonstrate that their performance can be further boosted to >2 mA/cm(2) by coupling with a solution-cast BiVO4 film in a heterojunction configuration. Our study unveils the great potential of nanostructured CuWO4 as the photoanode material for PEC water oxidation.
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Affiliation(s)
- Wen Ye
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University , Suzhou 215123, China
| | - Fengjiao Chen
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University , Suzhou 215123, China
| | - Feipeng Zhao
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University , Suzhou 215123, China
| | - Na Han
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University , Suzhou 215123, China
| | - Yanguang Li
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University , Suzhou 215123, China
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Jing M, Hou H, Banks CE, Yang Y, Zhang Y, Ji X. Alternating Voltage Introduced NiCo Double Hydroxide Layered Nanoflakes for an Asymmetric Supercapacitor. ACS Appl Mater Interfaces 2015; 7:22741-22744. [PMID: 26435064 DOI: 10.1021/acsami.5b05660] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
An electrochemical alternating voltage approach of producing NiCo double hydroxide (NiCoDH) layered ultrathin nanoflakes with large specific surface area (355.8 m(2) g(-1)), remarkable specific capacitance and rate capability is presented. The obtained NiCoDH as anode for asymmetric supercapacitors shows excellent energy density of 17.5 Wh kg(-1) at high power density of 10.5 kW kg(-1) and cycling stability (91.2% after 10,000 cycles).
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Affiliation(s)
- Mingjun Jing
- College of Chemistry and Chemical Engineering, Central South University , Changsha 410083, China
| | - Hongshuai Hou
- College of Chemistry and Chemical Engineering, Central South University , Changsha 410083, China
| | - Craig E Banks
- Faculty of Science and Engineering, School of Chemistry and the Environment, Division of Chemistry and Environmental Science, Manchester Metropolitan University , Chester Street, Manchester M1 5GD, United Kingdom
| | - Yingchang Yang
- College of Chemistry and Chemical Engineering, Central South University , Changsha 410083, China
| | - Yan Zhang
- College of Chemistry and Chemical Engineering, Central South University , Changsha 410083, China
| | - Xiaobo Ji
- College of Chemistry and Chemical Engineering, Central South University , Changsha 410083, China
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Zhu C, Li C, Zheng M, Delaunay JJ. Plasma-Induced Oxygen Vacancies in Ultrathin Hematite Nanoflakes Promoting Photoelectrochemical Water Oxidation. ACS Appl Mater Interfaces 2015; 7:22355-22363. [PMID: 26400020 DOI: 10.1021/acsami.5b06131] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The incorporation of oxygen vacancies in hematite has been investigated as a promising route to improve oxygen evolution reaction activity of hematite photoanodes used in photoelectrochemical water oxidation. However, introducing oxygen vacancies intentionally in α-Fe2O3 for active solar water splitting through facile and effective methods remains a challenge. Herein, air plasma treatment is shown to produce oxygen vacancies in α-Fe2O3, and ultrathin α-Fe2O3 nanoflakes are used to investigate the effect of oxygen vacancies on the performance of photoelectrochemical oxygen oxidation. Increasing the plasma treatment duration and power is found to increase the density of oxygen vacancies and leads to a significant enhancement of the photocurrent response. The nanoflake photoanode with the optimized plasma treatment yields an incident photo-to-current conversion efficiency of 35.4% at 350 nm under 1.6 V vs RHE without resorting to any other cocatalysts, an efficiency far exceeding that of the pristine α-Fe2O3 nanoflakes (∼2.2%). Evidence for the presence of high density of oxygen vacancies confined in nanoflakes is clarified by X-ray photoelectron spectroscopy. The increased number of oxygen vacancies after plasma treatment resulting in an increased carrier density is interpreted as the main cause for the enhanced oxygen evolution reaction activity.
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Affiliation(s)
- Changqing Zhu
- Department of Physics and Astronomy, Shanghai Jiao Tong University , Shanghai 200240, PR China
- School of Engineering, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Changli Li
- School of Engineering, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Maojun Zheng
- Department of Physics and Astronomy, Shanghai Jiao Tong University , Shanghai 200240, PR China
| | - Jean-Jacques Delaunay
- School of Engineering, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Qorbani M, Naseri N, Moshfegh AZ. Hierarchical Co3O4/Co(OH)2 Nanoflakes as a Supercapacitor Electrode: Experimental and Semi-Empirical Model. ACS Appl Mater Interfaces 2015; 7:11172-11179. [PMID: 25970498 DOI: 10.1021/acsami.5b00806] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In this research, facile and low cost synthesis methods, electrodeposition at constant current density and anodization at various applied voltages, were used to produce hierarchical cobalt oxide/hydroxide nanoflakes on top of porous anodized cobalt layer. The maximum electrochemical capacitance of 601 mF cm(-2) at scan rate of 2 mV s(-1) was achieved for 30 V optimized anodization applied voltage with high stability. Morphology and surface chemical composition were determined by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) analysis. The size, thickness, and density of nanoflakes, as well as length of the porous anodized Co layer were measured about 460±45 nm, 52±5 nm, 22±3 μm(-2), and 3.4±0.3 μm for the optimized anodization voltage, respectively. Moreover, the effect of anodization voltage on the resulting supercapacitance was modeled by using the Butler-Volmer formalism. The behavior of the modeled capacitance in different anodization voltages was in good agreement with the measured experimental data, and it was found that the role and contribution of the porous morphology was more decisive than structure of nanoflakes in the supercapacitance application.
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Affiliation(s)
- Mohammad Qorbani
- †Department of Physics, Sharif University of Technology, Tehran 11155-9161, Iran
| | - Naimeh Naseri
- †Department of Physics, Sharif University of Technology, Tehran 11155-9161, Iran
- ‡School of Physics, Institute for Research in Fundamental Sciences (IPM), Tehran 19395-5531, Iran
| | - Alireza Z Moshfegh
- †Department of Physics, Sharif University of Technology, Tehran 11155-9161, Iran
- §Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Tehran 14588-89694, Iran
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Wang L, Zhou X, Nguyen NT, Schmuki P. Plasmon-enhanced photoelectrochemical water splitting using au nanoparticles decorated on hematite nanoflake arrays. ChemSusChem 2015; 8:618-22. [PMID: 25581403 DOI: 10.1002/cssc.201403013] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Revised: 10/15/2014] [Indexed: 05/15/2023]
Abstract
Hematite nanoflake arrays were decorated with Au nanoparticles through a simple solution chemistry approach. We show that the photoactivity of Au-decorated Fe2 O3 electrodes for photoelectrochemical water oxidation can be effectively enhanced in the UV/Visible region compared with the bare Fe2 O3 . Au-nanoparticle-decorated Fe2 O3 nanoflake electrodes exhibit a significant cathodic shift of the onset potential up to 0.6 V [vs. reversible hydrogen electrode (RHE)], and a two times increase in the water oxidation photocurrent is achieved at 1.23 VRHE . A maximum photocurrent of 2.0 mA cm(-2) at 1.6 VRHE is obtained in 1 M KOH under AM 1.5 (100 mW cm(-2) ) conditions. The enhancement in photocurrent can be attributed to the Au nanoparticles acting as plasmonic photosensitizers that increase the optical absorption.
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Affiliation(s)
- Lei Wang
- Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen (Germany)
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Mohamed SG, Chen CJ, Chen CK, Hu SF, Liu RS. High-performance lithium-ion battery and symmetric supercapacitors based on FeCo₂O₄ nanoflakes electrodes. ACS Appl Mater Interfaces 2014; 6:22701-22708. [PMID: 25437918 DOI: 10.1021/am5068244] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A successive preparation of FeCo2O4 nanoflakes arrays on nickel foam substrates is achieved by a simple hydrothermal synthesis method. After 170 cycles, a high capacity of 905 mAh g(-1) at 200 mA g(-1) current density and very good rate capabilities are obtained for lithium-ion battery because of the 2D porous structures of the nanoflakes arrays. The distinctive structural features provide the battery with excellent electrochemical performance. The symmetric supercapacitor on nonaqueous electrolyte demonstrates high specific capacitance of 433 F g(-1) at 0.1 A g(-1) and 16.7 F g(-1) at high scan rate of 5 V s(-1) and excellent cyclic performance of 2500 cycles of charge-discharge cycling at 2 A g(-1) current density, revealing excellent long-term cyclability of the electrode even under rapid charge-discharge conditions.
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Affiliation(s)
- Saad Gomaa Mohamed
- Department of Chemistry, National Taiwan University , Taipei 106, Taiwan
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Jiang YM, Wang KX, Wu XY, Zhang HJ, Bartlett BM, Chen JS. Li4Ti5O12/TiO2 hollow spheres composed nanoflakes with preferentially exposed Li4Ti5O12 (011) facets for high-rate lithium ion batteries. ACS Appl Mater Interfaces 2014; 6:19791-19796. [PMID: 25333628 DOI: 10.1021/am504931r] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Li4Ti5O12/TiO2 hollow spheres composed of nanoflakes with preferentially exposed Li4Ti5O12 (011) facets have been successfully fabricated via a facile hydrothermal processing route and following calcination. These hollow spheres show good electrochemical performance in terms of high capacity (266 mAh g(-1) at 0.1 A g(-1)), and excellent rate capability (110 mAh g(-1) at 4.0 A g(-1) up to 100 cycles), attributed to unique morphology, preferred facet orientation of the nanoflakes and microscopic structure of the hollow spheres. The preferentially exposed Li4Ti5O12 (011) facets leads to fast lithium insertion/deinsertion processes in materials because of shorten lithium ion diffusion length, proved to be highly effective in improving the electrochemical properties of the hollow spheres. The excellent electrochemical performance makes these hollow spheres promising anode material for lithium ion batteries with high power and energy densities.
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Affiliation(s)
- Yan-Mei Jiang
- School of Chemistry and Chemical Engineering, ‡School of Materials Science and Engineering, Shanghai Jiao Tong University , Shanghai 200240, China
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Abstract
We developed a postgrowth modification method of two-dimensional WO3 nanoflakes by a simultaneous solution etching and reducing process in a weakly acidic condition. The obtained dual etched and reduced WO3 nanoflakes have a much rougher surface, in which oxygen vacancies are created during the simultaneous etching/reducing process for optimized photoelectrochemical performance. The obtained photoanodes show an enhanced photocurrent density of ∼1.10 mA/cm(2) at 1.0 V vs Ag/AgCl (∼1.23 V vs reversible hydrogen electrode), compared to 0.62 mA/cm(2) of pristine WO3 nanoflakes. The electrochemical impedance spectroscopy measurement and the density functional theory calculation demonstrate that this improved performance of dual etched and reduced WO3 nanoflakes is attributed to the increase of charge carrier density as a result of the synergetic effect of etching and reducing.
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Affiliation(s)
- Wenjie Li
- Laboratory of Advanced Materials, Department of Chemistry and ‡Key Laboratory of Computational Physical Sciences, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University , Shanghai, 200433, China
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Abstract
The results from calculations of optical and electronic properties of triangular MoS2 nanoflakes with edge lengths ranging from 1.6 to 10.4 nm are presented. The optical spectra were calculated using the time-dependent extension of the density-functional tight-binding method (TD-DFTB). The size effect in the optical absorption spectra is clearly visible. With decreasing length of the nanoflakes edges, the long-wavelength absorption in the range of visible light is shifted toward short-wavelength absorption, confirming a quantum-confinement-like behavior of these flakes. In contrast, the edges of the nanoflakes exhibit a distinct metallic-like behavior. The relation of the absorption properties to the observed photoluminescence of MoS2 nanoflakes is discussed in a qualitative manner.
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Affiliation(s)
- Tsegabirhan B Wendumu
- †Physikalische Chemie, Technische Universität Dresden, Bergstr. 66b, 01069 Dresden, Germany
- ‡Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, 01187 Dresden, Germany
| | - Gotthard Seifert
- †Physikalische Chemie, Technische Universität Dresden, Bergstr. 66b, 01069 Dresden, Germany
| | - Tommy Lorenz
- †Physikalische Chemie, Technische Universität Dresden, Bergstr. 66b, 01069 Dresden, Germany
- §Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, P.O. Box 51 01 19, 01314 Dresden, Germany
| | - Jan-Ole Joswig
- †Physikalische Chemie, Technische Universität Dresden, Bergstr. 66b, 01069 Dresden, Germany
| | - Andrey Enyashin
- †Physikalische Chemie, Technische Universität Dresden, Bergstr. 66b, 01069 Dresden, Germany
- ∥Institute of Solid State Chemistry, UB RAS, Pervomayskaya 91, 620990 Ekaterinburg, Russia
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Miró P, Han JH, Cheon J, Heine T. Hexagonal transition-metal chalcogenide nanoflakes with pronounced lateral quantum confinement. Angew Chem Int Ed Engl 2014; 53:12624-8. [PMID: 25213643 DOI: 10.1002/anie.201404704] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2014] [Revised: 07/10/2014] [Indexed: 11/07/2022]
Abstract
Transition-metal chalcogenide (TMC) nanoflakes of composition MX2 (where M=Ti, Zr and Hf; X=S and Se) crystallize preferentially in equilateral hexagons and exhibit a pronounced lateral quantum confinement. The hexagonal shape of octahedral (1T) TMC nanoflakes is the result of charge localization at the edges/vertices and the resulting Coulomb repulsion. Independent of their size, all nanoflakes have the Mn X2n-2 stoichiometry and thus an unoxidized metal center which results in dopant states. These states become relevant for small nanoflakes and lead to metallic character, but for larger nanoflakes (>6 nm) the 2D monolayer properties dominate. Finally, coordination of Lewis bases at the nanoflake edges has no significant effect on the electronic structure of these species confirming the viability of colloidal synthetic approaches.
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Affiliation(s)
- Pere Miró
- School of Engineering and Science, Jacobs University Bremen, Campus Ring 1, 28759 Bremen (Germany).
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42
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Wang HY, Xiao FX, Yu L, Liu B, Lou XWD. Hierarchical α-MnO2 nanowires@Ni1-x Mnx Oy nanoflakes core-shell nanostructures for supercapacitors. Small 2014; 10:3181-6. [PMID: 24711308 DOI: 10.1002/smll.201303836] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Indexed: 05/17/2023]
Abstract
A facile two-step solution-phase method has been developed for the preparation of hierarchical α-MnO2 nanowires@Ni1-x Mnx Oy nanoflakes core-shell nanostructures. Ultralong α-MnO2 nanowires were synthesized by a hydrothermal method in the first step. Subsequently, Ni1-x Mnx Oy nanoflakes were grown on α-MnO2 nanowires to form core-shell nanostructures using chemical bath deposition followed by thermal annealing. Both solution-phase methods can be easily scaled up for mass production. We have evaluated their application in supercapacitors. The ultralong one-dimensional (1D) α-MnO2 nanowires in hierarchical core-shell nanostructures offer a stable and efficient backbone for charge transport; while the two-dimensional (2D) Ni1-x Mnx Oy nanoflakes on α-MnO2 nanowires provide high accessible surface to ions in the electrolyte. These beneficial features enable the electrode with high capacitance and reliable stability. The capacitance of the core-shell α-MnO2 @Ni1-x Mnx Oy nanostructures (x = 0.75) is as high as 657 F g(-1) at a current density of 250 mA g(-1) , and stable charging-discharging cycling over 1000 times at a current density of 2000 mA g(-1) has been realized.
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Affiliation(s)
- Hsin-Yi Wang
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore
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Mai L, An Q, Wei Q, Fei J, Zhang P, Xu X, Zhao Y, Yan M, Wen W, Xu L. Nanoflakes-assembled three-dimensional hollow-porous v2 o5 as lithium storage cathodes with high-rate capacity. Small 2014; 10:3032-3037. [PMID: 24711281 DOI: 10.1002/smll.201302991] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2013] [Indexed: 06/03/2023]
Abstract
Three-dimensional (3D) hollow-porous vanadium pentoxide (V2 O5 ) quasi-microspheres are synthesized by a facile solvothermal method followed by annealing at 450 °C in air. The interconnected hollow-porous networks facilitate the kinetics of lithium-ion diffusion and improve the performance of V2 O5 to achieve a high capacity and remarkable rate capability as a cathode material for lithium batteries.
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Affiliation(s)
- Liqiang Mai
- WUT-Harvard Joint Nano Key Laboratory, State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China
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Randeniya LK, Shi H, Barnard AS, Fang J, Martin PJ, Ostrikov KK. Harnessing the influence of reactive edges and defects of graphene substrates for achieving complete cycle of room-temperature molecular sensing. Small 2013; 9:3993-3999. [PMID: 23813883 DOI: 10.1002/smll.201300689] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Revised: 04/07/2013] [Indexed: 06/02/2023]
Abstract
Molecular doping and detection are at the forefront of graphene research, a topic of great interest in physical and materials science. Molecules adsorb strongly on graphene, leading to a change in electrical conductivity at room temperature. However, a common impediment for practical applications reported by all studies to date is the excessively slow rate of desorption of important reactive gases such as ammonia and nitrogen dioxide. Annealing at high temperatures, or exposure to strong ultraviolet light under vacuum, is employed to facilitate desorption of these gases. In this article, the molecules adsorbed on graphene nanoflakes and on chemically derived graphene-nanomesh flakes are displaced rapidly at room temperature in air by the use of gaseous polar molecules such as water and ethanol. The mechanism for desorption is proposed to arise from the electrostatic forces exerted by the polar molecules, which decouples the overlap between substrate defect states, molecule states, and graphene states near the Fermi level. Using chemiresistors prepared from water-based dispersions of single-layer graphene on mesoporous alumina membranes, the study further shows that the edges of the graphene flakes (showing p-type responses to NO₂ and NH₃) and the edges of graphene nanomesh structures (showing n-type responses to NO₂ and NH₃) have enhanced sensitivity. The measured responses towards gases are comparable to or better than those which have been obtained using devices that are more sophisticated. The higher sensitivity and rapid regeneration of the sensor at room temperature provides a clear advancement towards practical molecule detection using graphene-based materials.
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Affiliation(s)
- Lakshman K Randeniya
- CSIRO Materials Science and Engineering, PO Box 218, Lindfield, NSW 2070, Australia.
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