|
1
|
Khlifi N, Ihzaz N, Toulemonde O, Dandre A, Labrugère-Sarroste C, Bessadok MN, Lemine OM, El Mir L. Cobalt-doped ZnO nanoparticles and PLD-deposited thin film forms: structure, optical properties and nature of magnetic anisotropy. RSC Adv 2024; 14:27622-27633. [PMID: 39221124 PMCID: PMC11363065 DOI: 10.1039/d4ra05021e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2024] [Accepted: 08/18/2024] [Indexed: 09/04/2024] Open
Abstract
Cobalt-doped zinc oxide nanoparticles (NPs) were synthesized using a modified sol-gel method. Thereafter, the obtained powder was deposited on a Suprasil glass substrate by employing a pulsed laser deposition (PLD) technique. X-ray diffraction analysis with Rietveld refinement confirmed a hexagonal wurtzite ZnO phase belonging to the P63 mc space group for both samples in the NP and thin film forms. In particular, the thin film exhibited an intensive (002) XRD peak, indicating that it had a preferred c-axis orientation owing to the self-texturing mechanism. No segregated secondary phases were detected. The crystallite structure, morphology, and size were investigated using high-resolution transmission electron microscopy (HRTEM). To study the crystalline quality, structural disorder, and defects in the host lattice, we employed Raman spectroscopy. UV-vis-NIR spectroscopy was performed to confirm the nature of the Co-doped ZnO NP powder and the film. The chemical states of oxygen and zinc in the thin film sample were also investigated via X-ray photoelectron spectroscopy (XPS). The M-T curve could be successfully fitted using both the three-dimensional (3D) spin-wave model and Curie-Weiss law, confirming the mixed state existence of weak ferromagnetic (FM) and paramagnetic (PM) phases. Magnetic interaction was quantitatively studied and explained by polaronic percolation of bound magnetic polarons (BMPs). Analysis of magnetic symmetry of the topological antiferromagnetic as-deposited thin film using torque measurements was performed. Based on a phenomenological model, it was revealed that the structure gives rise to uniaxial magneto-crystalline anisotropy (UMA) with the magnetic easy axis parallel to the c-axis.
Collapse
Affiliation(s)
- N Khlifi
- Laboratory of Physics of Materials and Nanomaterials Applied at Environment (LaPhyMNE), Gabes University, Faculty of Sciences in Gabes 6072 Gabes Tunisia
| | - N Ihzaz
- Laboratory of Physics of Materials and Nanomaterials Applied at Environment (LaPhyMNE), Gabes University, Faculty of Sciences in Gabes 6072 Gabes Tunisia
| | - O Toulemonde
- ICMCB-CNRS - Université de Bordeaux 87, avenue du Dr Albert Schweitzer 33608 Pessac cedex France
| | - A Dandre
- ICMCB-CNRS - Université de Bordeaux 87, avenue du Dr Albert Schweitzer 33608 Pessac cedex France
| | | | - M N Bessadok
- Laboratory of Physics of Materials and Nanomaterials Applied at Environment (LaPhyMNE), Gabes University, Faculty of Sciences in Gabes 6072 Gabes Tunisia
| | - O M Lemine
- Department of Physics, College of Sciences, Imam Mohammad Ibn Saud Islamic University (IMISU) Riyadh 11623 Saudi Arabia
| | - L El Mir
- Laboratory of Physics of Materials and Nanomaterials Applied at Environment (LaPhyMNE), Gabes University, Faculty of Sciences in Gabes 6072 Gabes Tunisia
| |
Collapse
|
|
2
|
Çiftçi NO, Şentürk SB, Sezen Y, Kaykusuz SÜ, Long H, Ergen O. Controllable synthesis of borophene aerogels by utilizing h-BN layers for high-performance next-generation batteries. Proc Natl Acad Sci U S A 2023; 120:e2307537120. [PMID: 37812711 PMCID: PMC10589658 DOI: 10.1073/pnas.2307537120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Accepted: 08/24/2023] [Indexed: 10/11/2023] Open
Abstract
Borophene is emerging as a promising electrode material for Li, Na, Mg, and Ca ion batteries due to its anisotropic Dirac properties, high charge capacity, and low energy barrier for ion diffusion. However, practical synthesis of active and stable borophene remains challenging in producing electrochemical devices. Here, we introduce a method for borophene aerogels (BoAs), utilizing hexagonal boron nitride aerogels. Borophene grows between h-BN layers utilizing boron-boron bridges, as a nucleation site, where borophene forms monolayers mixed with sp2-sp3 hybridization. This versatile method produces stable BoAs and is compatible with various battery chemistries. With these BoAs, we accomplish an important milestone to successfully fabricate high-performance next-generation batteries, including Na-ion (478 mAh g-1, at 0.5C, >300 cycles), Mg-ion (297 mAh g-1, at 0.5C, >300 cycles), and Ca-ion (332 mAh g-1, at 0.5C, >400 cycles), and Li-S batteries, with one of the highest capacities to date (1,559 mAh g-1, at 0.3C, >1,000 cycles).
Collapse
Affiliation(s)
- Niyazi Okan Çiftçi
- Department of Electronics and Communication Engineering, Istanbul Technical University, Istanbul34469, Turkey
- Next-Ion-Energy Inc., Yuba City, CA95991
| | - Sevil Berrak Şentürk
- Department of Electronics and Communication Engineering, Istanbul Technical University, Istanbul34469, Turkey
| | - Yaren Sezen
- Department of Electronics and Communication Engineering, Istanbul Technical University, Istanbul34469, Turkey
| | - Süreyya Üstün Kaykusuz
- Department of Electronics and Communication Engineering, Istanbul Technical University, Istanbul34469, Turkey
| | - Hu Long
- Next-Ion-Energy Inc., Yuba City, CA95991
| | - Onur Ergen
- Department of Electronics and Communication Engineering, Istanbul Technical University, Istanbul34469, Turkey
- Next-Ion-Energy Inc., Yuba City, CA95991
- Department of Mechanical Engineering, Huazhong University of Science and Technology, Wuhan430074, China
| |
Collapse
|
|
3
|
Xu H, Ding B, Xu Y, Huang Z, Wei D, Chen S, Lan T, Pan Y, Cheng HM, Liu B. Magnetically tunable and stable deep-ultraviolet birefringent optics using two-dimensional hexagonal boron nitride. NATURE NANOTECHNOLOGY 2022; 17:1091-1096. [PMID: 35953540 DOI: 10.1038/s41565-022-01186-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Accepted: 06/28/2022] [Indexed: 06/15/2023]
Abstract
Birefringence is a fundamental optical property that can induce phase retardation of polarized light. Tuning the birefringence of liquid crystals is a core technology for light manipulation in current applications in the visible and infrared spectral regions. Due to the strong absorption or instability of conventional liquid crystals in deep-ultraviolet light, tunable birefringence remains elusive in this region, notwithstanding its significance in diverse applications. Here we show a stable and birefringence-tunable deep-ultraviolet modulator based on two-dimensional hexagonal boron nitride. It has an extremely large optical anisotropy factor of 6.5 × 10-12 C2 J-1 m-1 that gives rise to a specific magneto-optical Cotton-Mouton coefficient of 8.0 × 106 T-2 m-1, which is about five orders of magnitude higher than other potential deep-ultraviolet-transparent media. The large coefficient, high stability (retention rate of 99.7% after 270 cycles) and wide bandgap of boron nitride collectively enable the fabrication of stable deep-ultraviolet modulators with magnetically tunable birefringence.
Collapse
Affiliation(s)
- Hao Xu
- Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
| | - Baofu Ding
- Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China.
- Institute of Technology for Carbon Neutrality/Faculty of Materials Science and Engineering, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China.
| | - Youan Xu
- Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
- Xi'an Research Institute of High Technology, Xi'an, China
| | - Ziyang Huang
- Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
| | - Dahai Wei
- State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, China
| | - Shaohua Chen
- Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
| | - Tianshu Lan
- Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
| | - Yikun Pan
- Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
| | - Hui-Ming Cheng
- Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China.
- Institute of Technology for Carbon Neutrality/Faculty of Materials Science and Engineering, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China.
- Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China.
- Advanced Technology Institute, University of Surrey, Guildford, UK.
| | - Bilu Liu
- Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China.
| |
Collapse
|
|
4
|
Yang B, Gao L, Xue M, Wang H, Hou Y, Luo Y, Xiao H, Hu H, Cui C, Wang H, Zhang J, Li YF, Xie G, Tong X, Xie Y. Experimental and Simulation Research on the Preparation of Carbon Nano-Materials by Chemical Vapor Deposition. MATERIALS 2021; 14:ma14237356. [PMID: 34885507 PMCID: PMC8658281 DOI: 10.3390/ma14237356] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/10/2021] [Revised: 11/10/2021] [Accepted: 11/18/2021] [Indexed: 11/17/2022]
Abstract
Carbon nano-materials have been widely used in many fields due to their electron transport, mechanics, and gas adsorption properties. This paper introduces the structure and properties of carbon nano-materials the preparation of carbon nano-materials by chemical vapor deposition method (CVD)—which is one of the most common preparation methods—and reaction simulation. A major factor affecting the material structure is its preparation link. Different preparation methods or different conditions will have a great impact on the structure and properties of the material (mechanical properties, electrical properties, magnetism, etc.). The main influencing factors (precursor, substrate, and catalyst) of carbon nano-materials prepared by CVD are summarized. Through simulation, the reaction can be optimized and the growth mode of substances can be controlled. Currently, numerical simulations of the CVD process can be utilized in two ways: changing the CVD reactor structure and observing CVD chemical reactions. Therefore, the development and research status of computational fluid dynamics (CFD) for CVD are summarized, as is the potential of combining experimental studies and numerical simulations to achieve and optimize controllable carbon nano-materials growth.
Collapse
Affiliation(s)
- Bo Yang
- Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China; (B.Y.); (Y.H.)
- School of Materials and Architectural Engineering, Guizhou Normal University, Guiyang 550014, China
- Key Laboratory of Low-Dimensional Materials and Big Data, School of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China; (L.G.); (M.X.); (H.W.); (Y.L.); (H.X.); (H.H.); (C.C.); (H.W.); (J.Z.)
| | - Lanxing Gao
- Key Laboratory of Low-Dimensional Materials and Big Data, School of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China; (L.G.); (M.X.); (H.W.); (Y.L.); (H.X.); (H.H.); (C.C.); (H.W.); (J.Z.)
| | - Miaoxuan Xue
- Key Laboratory of Low-Dimensional Materials and Big Data, School of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China; (L.G.); (M.X.); (H.W.); (Y.L.); (H.X.); (H.H.); (C.C.); (H.W.); (J.Z.)
| | - Haihe Wang
- Key Laboratory of Low-Dimensional Materials and Big Data, School of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China; (L.G.); (M.X.); (H.W.); (Y.L.); (H.X.); (H.H.); (C.C.); (H.W.); (J.Z.)
- Guizhou Ecological and Environment Monitoring Center, Guiyang 550014, China
| | - Yanqing Hou
- Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China; (B.Y.); (Y.H.)
- Key Laboratory of Low-Dimensional Materials and Big Data, School of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China; (L.G.); (M.X.); (H.W.); (Y.L.); (H.X.); (H.H.); (C.C.); (H.W.); (J.Z.)
| | - Yingchun Luo
- Key Laboratory of Low-Dimensional Materials and Big Data, School of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China; (L.G.); (M.X.); (H.W.); (Y.L.); (H.X.); (H.H.); (C.C.); (H.W.); (J.Z.)
| | - Han Xiao
- Key Laboratory of Low-Dimensional Materials and Big Data, School of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China; (L.G.); (M.X.); (H.W.); (Y.L.); (H.X.); (H.H.); (C.C.); (H.W.); (J.Z.)
| | - Hailiang Hu
- Key Laboratory of Low-Dimensional Materials and Big Data, School of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China; (L.G.); (M.X.); (H.W.); (Y.L.); (H.X.); (H.H.); (C.C.); (H.W.); (J.Z.)
| | - Can Cui
- Key Laboratory of Low-Dimensional Materials and Big Data, School of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China; (L.G.); (M.X.); (H.W.); (Y.L.); (H.X.); (H.H.); (C.C.); (H.W.); (J.Z.)
| | - Huanjiang Wang
- Key Laboratory of Low-Dimensional Materials and Big Data, School of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China; (L.G.); (M.X.); (H.W.); (Y.L.); (H.X.); (H.H.); (C.C.); (H.W.); (J.Z.)
| | - Jianhui Zhang
- Key Laboratory of Low-Dimensional Materials and Big Data, School of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China; (L.G.); (M.X.); (H.W.); (Y.L.); (H.X.); (H.H.); (C.C.); (H.W.); (J.Z.)
| | - Yu-Feng Li
- Key Laboratory of Low-Dimensional Materials and Big Data, School of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China; (L.G.); (M.X.); (H.W.); (Y.L.); (H.X.); (H.H.); (C.C.); (H.W.); (J.Z.)
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
- Correspondence: (Y.L.); (G.X.); (X.T.); (Y.X.)
| | - Gang Xie
- Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China; (B.Y.); (Y.H.)
- Key Laboratory of Low-Dimensional Materials and Big Data, School of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China; (L.G.); (M.X.); (H.W.); (Y.L.); (H.X.); (H.H.); (C.C.); (H.W.); (J.Z.)
- State Key Laboratory of Common Associated Non-Ferrous Metal Resources Pressure Hydrometallurgy Technology, Kunming 650503, China
- Correspondence: (Y.L.); (G.X.); (X.T.); (Y.X.)
| | - Xin Tong
- Key Laboratory of Low-Dimensional Materials and Big Data, School of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China; (L.G.); (M.X.); (H.W.); (Y.L.); (H.X.); (H.H.); (C.C.); (H.W.); (J.Z.)
- School of Chemistry and Materials Science, Guizhou Normal University, Guiyang 550014, China
- Correspondence: (Y.L.); (G.X.); (X.T.); (Y.X.)
| | - Yadian Xie
- Key Laboratory of Low-Dimensional Materials and Big Data, School of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China; (L.G.); (M.X.); (H.W.); (Y.L.); (H.X.); (H.H.); (C.C.); (H.W.); (J.Z.)
- Correspondence: (Y.L.); (G.X.); (X.T.); (Y.X.)
| |
Collapse
|
|
5
|
Wang D, Liu Z, Hong Y, Lin C, Pan Q, Li L, Shi K. Controlled preparation of multiple mesoporous CoAl-LDHs nanosheets for the high performance of NO x detection at room temperature. RSC Adv 2020; 10:34466-34473. [PMID: 35514368 PMCID: PMC9056767 DOI: 10.1039/d0ra06250b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2020] [Accepted: 08/26/2020] [Indexed: 01/05/2023] Open
Abstract
By fine tuning the metal mole ratio, CoAl-LDHs (CA) with a 2D nanosheet structure were successfully prepared via a one-step hydrothermal method using urea as both precipitator and pore-forming agent. The morphology of CA samples shows uniform and thin porous hexagonal nanosheets. In particular, CA2-1, prepared with the 2 : 1 molar ratio for Co and Al, respectively, has the highest surface area (54 m2 g-1); its average transverse size of platelets is 2.54 μm with a thickness of around 19.30 nm and inter-plate spacing of about 0.2 μm. The sample exhibits a high sensing performance (response value of 17.09) towards 100 ppm NO x , fast response time (4.27 s) and a low limit of detection (down to 0.01 ppm) at room temperature. Furthermore, CA2-1 shows long -term stability (60 days) and a better selectivity towards NO x at room temperature. The excellent performance of the fabricated sensor is attributed to the special hexagonal structure of the 2D thin nanosheets with abundant mesopores, where the active sites provide fast adsorption and transportation channels, promote oxygen chemisorption, and eventually decrease the diffusion energy barrier for NO x molecules. Furthermore, hydrogen bonds between water molecules and OH- could serve as a bridge, thus providing a channel for rapid electron transfer. This easy synthetic approach and good gas sensing performance allow CoAl-LDHs to be great potential materials in the field of NO x gas sensing.
Collapse
Affiliation(s)
- Di Wang
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Key Laboratory of Physical Chemistry, School of Chemistry and Material Science, Heilongjiang University Harbin 150080 P. R. China +86 451 86609141
| | - Zhi Liu
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Key Laboratory of Physical Chemistry, School of Chemistry and Material Science, Heilongjiang University Harbin 150080 P. R. China +86 451 86609141
| | - Ye Hong
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Key Laboratory of Physical Chemistry, School of Chemistry and Material Science, Heilongjiang University Harbin 150080 P. R. China +86 451 86609141
| | - Chong Lin
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Key Laboratory of Physical Chemistry, School of Chemistry and Material Science, Heilongjiang University Harbin 150080 P. R. China +86 451 86609141
| | - Qingjiang Pan
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Key Laboratory of Physical Chemistry, School of Chemistry and Material Science, Heilongjiang University Harbin 150080 P. R. China +86 451 86609141
| | - Li Li
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Key Laboratory of Physical Chemistry, School of Chemistry and Material Science, Heilongjiang University Harbin 150080 P. R. China +86 451 86609141
- College of Advanced Agriculture and Ecological Environment, Heilongjiang University Harbin 150080 P. R. China +86 451 8660 4920
| | - Keying Shi
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Key Laboratory of Physical Chemistry, School of Chemistry and Material Science, Heilongjiang University Harbin 150080 P. R. China +86 451 86609141
| |
Collapse
|
|
6
|
Lan T, Ding B, Liu B. Magneto‐optic effect of two‐dimensional materials and related applications. NANO SELECT 2020. [DOI: 10.1002/nano.202000032] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Affiliation(s)
- Tianshu Lan
- Tsinghua‐Berkeley Shenzhen Institute and Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen 518055 China
| | - Baofu Ding
- Tsinghua‐Berkeley Shenzhen Institute and Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen 518055 China
| | - Bilu Liu
- Tsinghua‐Berkeley Shenzhen Institute and Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen 518055 China
| |
Collapse
|
|
7
|
Sarve A, George J, Agrawal S, Jasra RV, Munshi P. Unidirectional growth of organic single crystals of naphthalene, anthracene and pyrene by isothermal expansion of supercritical CO 2. RSC Adv 2020; 10:22480-22486. [PMID: 35514597 PMCID: PMC9054696 DOI: 10.1039/d0ra03706k] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Accepted: 05/22/2020] [Indexed: 11/24/2022] Open
Abstract
Unidirectional single crystals without grain boundaries are highly important in optoelectronic applications. Conventional methods to obtain such crystals involve organic solvents or seed crystals, which have numerous drawbacks. We present here a supercritical CO2-mediated method of the single crystal formation of naphthalene, anthracene and pyrene on the (001) plane without using seed crystals. Single dominant peaks in powder XRD (PXRD) with low full width at half maxima (FWHM) are described. The dependency of crystal size on the rate of depressurization was measured by precise and isothermal expansion of scCO2 solutions. The experimental setup is illustrated for continuous preparation without emission of CO2 or discharge of material into the environment. The materials are shown to be fully converted into crystals indicating a rapid, scalable and environmentally benign process of single crystal formation with practically nil E factor. Slow isothermal expansion of a supercritical CO2 solution resulting in unidirectional single crystals of controllable size as a method of crystallization with practically nil E factor.![]()
Collapse
Affiliation(s)
- Antaram Sarve
- Department of Chemical Engineering, Sardar Vallabhbhai National Institute of Technology Surat 395007 India
| | - Jimil George
- Department of Chemistry, Cochin University of Science and Technology Cochin Kerala 682022 India
| | - Santosh Agrawal
- Research Centre, Reliance Technology Group, Reliance Industries Limited Vadodara Gujarat 391346 India
| | - Raksh Vir Jasra
- Research Centre, Reliance Technology Group, Reliance Industries Limited Vadodara Gujarat 391346 India
| | - Pradip Munshi
- Research Centre, Reliance Technology Group, Reliance Industries Limited Vadodara Gujarat 391346 India
| |
Collapse
|
|
8
|
Hassan J, Ikram M, Ul-Hamid A, Imran M, Aqeel M, Ali S. Application of Chemically Exfoliated Boron Nitride Nanosheets Doped with Co to Remove Organic Pollutants Rapidly from Textile Water. NANOSCALE RESEARCH LETTERS 2020; 15:75. [PMID: 32266606 PMCID: PMC7138897 DOI: 10.1186/s11671-020-03315-y] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Accepted: 03/30/2020] [Indexed: 05/26/2023]
Abstract
Two-dimensional layered materials doped with transition metals exhibit enhanced magnetization and improved catalytic stability during water treatment leading to potential environmental applications across several industrial sectors. In the present study, cobalt (Co)-doped boron nitride nanosheets (BN-NS) were explored for such an application. Chemical exfoliation process was used to exfoliate BN-NS and the hydrothermal route was adopted to incorporate Co dopant in various concentrations (e.g., 2.5, 5, 7.5, and 10 wt%). X-ray diffraction (XRD) study indicated that crystallinity improved upon doping with the formation of a hexagonal phase of the synthesized material. Selected area electron diffraction (SAED) confirmed enhanced crystallinity, which corroborates XRD results. Interlayer spacing was evaluated through a high-resolution transmission electron microscope (HR-TEM) equipped with Gatan digital micrograph software. Compositional and functional group analysis was undertaken with energy dispersive X-ray (EDS) and Fourier transform infrared (FTIR) spectroscopy, respectively. Field emission scanning electron microscope (FE-SEM) and HR-TEM were utilized to probe surface morphologies of prepared samples. Bonding modes in the sample were identified through Raman analysis. Optical properties were examined using UV-vis spectroscopy. Photoluminescence spectra were acquired to estimate the separation and recombination of excitons. Magnetic properties were studied by means of hysteresis loop acquired using VSM measurements. Methylene blue dye was degraded with as-prepared host and doped nanosheets used as catalysts and investigated through absorption spectra ranging from 250 to 800 nm. The experimental results of this study indicate that Co-doped BN-NS showed enhanced magnetic properties and can be used to degrade dyes present as an effluent in industrial wastewater.
Collapse
Affiliation(s)
- J. Hassan
- Solar Cell Applications Research Lab, Department of Physics, Government College University Lahore, Lahore, Punjab 54000 Pakistan
- Department of Physics, Riphah Institute of Computing and Applied Sciences (RICAS), Riphah International University, 14 Ali Road, Lahore, Pakistan
| | - M. Ikram
- Solar Cell Applications Research Lab, Department of Physics, Government College University Lahore, Lahore, Punjab 54000 Pakistan
| | - A. Ul-Hamid
- Center for Engineering Research, Research Institute, King Fahd University of Petroleum & Minerals, Dhahran, 31261 Saudi Arabia
| | - M. Imran
- State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Centre for Soft Matter Science and Engineering, Beijing Engineering Center for Hierarchical Catalysts, Beijing University of Chemical Technology, Beijing, 100029 China
| | - M. Aqeel
- Solar Cell Applications Research Lab, Department of Physics, Government College University Lahore, Lahore, Punjab 54000 Pakistan
| | - S. Ali
- Department of Physics, Riphah Institute of Computing and Applied Sciences (RICAS), Riphah International University, 14 Ali Road, Lahore, Pakistan
| |
Collapse
|
|
9
|
Li D, Yan P, Zhao Q, Wang L, Ma X, Xue J, Zhang Y, Liu M. The hydrothermal synthesis of ZnSn(OH)6 and Zn2SnO4 and their photocatalytic performances. CrystEngComm 2020. [DOI: 10.1039/d0ce00777c] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The pH value and hydrothermal temperature played an important part in the transition between ZnSn(OH)6 and Zn2SnO4.
Collapse
Affiliation(s)
- Di Li
- School of Chemistry and Chemical Engineering
- Xi'an University of Architecture and Technology
- Xi'an
- China
| | - Peipei Yan
- School of Metallurgical Engineering
- Xi'an University of Architecture and Technology
- Xi'an
- China
| | - Qianqian Zhao
- School of Chemistry and Chemical Engineering
- Xi'an University of Architecture and Technology
- Xi'an
- China
| | - Li Wang
- School of Environmental and Municipal Engineering
- Xi'an University of Architecture and Technology
- Xi'an
- China
| | - Xinguo Ma
- School of Science
- Hubei University of Technology
- Wuhan
- China
| | - Juanqin Xue
- School of Chemistry and Chemical Engineering
- Xi'an University of Architecture and Technology
- Xi'an
- China
| | - Yujie Zhang
- School of Chemistry and Chemical Engineering
- Xi'an University of Architecture and Technology
- Xi'an
- China
| | - Manbo Liu
- School of Metallurgical Engineering
- Xi'an University of Architecture and Technology
- Xi'an
- China
| |
Collapse
|
|
10
|
Mao X, Zhu L, Liu H, Chen H, Ju P, Li W. Synthesis of graphene via electrochemical exfoliation in different electrolytes for direct electrodeposition of a Cu/graphene composite coating. RSC Adv 2019; 9:35524-35531. [PMID: 35528055 PMCID: PMC9074692 DOI: 10.1039/c9ra06541e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 10/17/2019] [Indexed: 12/11/2022] Open
Abstract
Directly dispersing graphene into an electrolyte still remains a crucial difficulty in electrodepositing a graphene enhanced composite coating onto electrical contact materials. Herein, graphene was synthesized via electrochemical exfoliation in an N,N-dimethylformamide (DMF)/H2O solution containing (NH4)2SO4. The electrochemically exfoliated graphene nanosheets (GNs) were directly dispersed by sonication. In comparison with graphene synthesized from aqueous solution, the GNs electrochemically exfoliated in the DMF/H2O–(NH4)2SO4 solution exhibit a lower degree of oxidation. Cu/graphene composite coatings were subsequently electrodeposited onto Cu foils by adding Cu2+ into the as-fabricated graphene solution. The surface nanostructure of the Cu/graphene composite coatings was transformed from loose pine needles to a uniform and compact structure with an increase in the concentration of Cu2+, which indicated that the controllable synthesis of Cu/graphene composite coatings with different performances could be achieved in graphene dispersions after adding Cu2+. In order to synthesize graphene via electrochemical exfoliation and directly electrodeposit a Cu/graphene composite coating without adding CuSO4 or any other additive, an attempt was made to directly electrodeposit a Cu/graphene composite coating in CuSO4/DMF/H2O solution after electrochemical exfoliation. Electrochemically exfoliated graphene was directly dispersed in the DMF/H2O solution for electrodeposition of a Cu/graphene composite coating.![]()
Collapse
Affiliation(s)
- Xinyu Mao
- Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University Beijing 100191 China +86 1082317113 +86 1082317113
| | - Liqun Zhu
- Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University Beijing 100191 China +86 1082317113 +86 1082317113
| | - Huicong Liu
- Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University Beijing 100191 China +86 1082317113 +86 1082317113
| | - Haining Chen
- Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University Beijing 100191 China +86 1082317113 +86 1082317113
| | - Pengfei Ju
- Shanghai Aerospace Equipment Manufacture Shanghai 200245 China
| | - Weiping Li
- Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University Beijing 100191 China +86 1082317113 +86 1082317113
| |
Collapse
|
|
11
|
Jing Y, Jia L, Zheng Y, Zhang H. Hydrothermal synthesis and competitive growth of flake-like M-type strontium hexaferrite. RSC Adv 2019; 9:33388-33394. [PMID: 35529158 PMCID: PMC9073388 DOI: 10.1039/c9ra06246g] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2019] [Accepted: 09/19/2019] [Indexed: 11/21/2022] Open
Abstract
In this paper, single flake-like strontium hexaferrite was directly synthesized via a modified hydrothermal approach without high-temperature annealing. To determine the main factors governing the formation of the hexaferrite phase and impurity α-Fe2O3, effects of alkali environment and concentrations of metal ions on phase composition, grain growth, and magnetic properties were systematically analyzed. Results from XRD, FESEM and FT-IR analyses indicated that initial alkali concentration was the key factor influencing the phase composition of particles. Suitable initial alkali environment can enhance the nucleation and growth of ferrite, and inhibit the formation of by-product α-Fe2O3 at the same time. It was also found that the increase in initial concentration of strontium ions could improve the nucleation of hexaferrite and reduce the grain size, and consequently, change the magnetic performance of hexagonal particles. When the molar ratios of ferric ions to strontium ions were constant, the average grain size did not change significantly with the initial concentration of iron ions, which could be attributed to high levels of strontium ions and hydroxyl ions in the reaction system. The above-mentioned results indicate that the optimized hydrothermal conditions are beneficial for the formation of a single phase and for controlling the particle size and magnetic properties of M-type hexaferrite.
Collapse
Affiliation(s)
- Yilong Jing
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China Chengdu 610054 PR China
| | - Lijun Jia
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China Chengdu 610054 PR China
| | - Yuhang Zheng
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China Chengdu 610054 PR China
| | - Huaiwu Zhang
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China Chengdu 610054 PR China
| |
Collapse
|
|
12
|
Yao C, Ismail M, Hao A, Thatikonda SK, Huang W, Qin N, Bao D. Annealing atmosphere effect on the resistive switching and magnetic properties of spinel Co 3O 4 thin films prepared by a sol-gel technique. RSC Adv 2019; 9:12615-12625. [PMID: 35515842 PMCID: PMC9063653 DOI: 10.1039/c9ra01121h] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Accepted: 04/17/2019] [Indexed: 12/15/2022] Open
Abstract
Spinel Co3O4 thin films were synthesized using a sol-gel technique to study the annealing atmosphere effect on resistive switching (RS) and magnetic modulation properties. Compared with oxygen and air annealed Pt/Co3O4/Pt stacks, the nitrogen annealed Pt/Co3O4/Pt stack shows optimal switching parameters such as a lower forming voltage, uniform distribution of switching voltages, excellent cycle-to-cycle endurance (>800 cycles), and good data retention. Improvement in switching parameters is ascribed to the formation of confined conducting filaments (CFs) which are composed of oxygen vacancies. From the analysis of current-voltage characteristics and their temperature dependence, the carrier transport mechanism in the high-field region of the high resistance state was dominated by Schottky emission. Besides, temperature dependent resistance and magnetization variations revealed that the physical mechanism of RS can be explained based on the formation and rupture of oxygen vacancy based CFs. In addition, multilevel saturation magnetization under different resistance states is attributed to the variation of oxygen vacancy concentration accompanied with the changes in the valence state of cations. Results suggested that using a nitrogen annealing atmosphere to anneal the thin films is a feasible approach to improve RS parameters and enhance the magnetic properties of Co3O4 thin film, which shows promising applications to design multifunctional electro-magnetic coupling nonvolatile memory devices.
Collapse
Affiliation(s)
- Chuangye Yao
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, Sun Yat-Sen University Guangzhou 510275 China
| | - Muhammad Ismail
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, Sun Yat-Sen University Guangzhou 510275 China
| | - Aize Hao
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, Sun Yat-Sen University Guangzhou 510275 China
| | - Santhosh Kumar Thatikonda
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, Sun Yat-Sen University Guangzhou 510275 China
| | - Wenhua Huang
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, Sun Yat-Sen University Guangzhou 510275 China
| | - Ni Qin
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, Sun Yat-Sen University Guangzhou 510275 China
| | - Dinghua Bao
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, Sun Yat-Sen University Guangzhou 510275 China
| |
Collapse
|