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Recum P, Hirsch T. Graphene-based chemiresistive gas sensors. NANOSCALE ADVANCES 2023; 6:11-31. [PMID: 38125587 PMCID: PMC10729924 DOI: 10.1039/d3na00423f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 10/17/2023] [Indexed: 12/23/2023]
Abstract
Gas sensors allow the monitoring of the chemical environment of humans, which is often crucial for their wellbeing or even survival. Miniaturization, reversibility, and selectivity are some of the key challenges for serial use of chemical sensors. This tutorial review describes critical aspects when using nanomaterials as sensing substrates for the application in chemiresistive gas sensors. Graphene has been shown to be a promising candidate, as it allows gas sensors to be operated at room temperature, possibly saving large amounts of energy. In this review, an overview is given on the general mechanisms for gas-sensitive semiconducting materials and the implications of doping and functionalization on the sensing parameters of chemiresistive devices. It shows in detail how different challenges, like sensitivity, response time, reversibility and selectivity have been approached by material development and operation modes. In addition, perspectives from the area of data analysis and intelligent algorithms are presented, which can further enhance these sensors' usability in the field.
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2
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Zhang Q, Zhou Y, Tong Y, Chi Y, Liu R, Dai C, Li Z, Cui Z, Liang Y, Tan Y. Reduced Graphene Oxide Coating LiFePO 4 Composite Cathodes for Advanced Lithium-Ion Battery Applications. Int J Mol Sci 2023; 24:17549. [PMID: 38139376 PMCID: PMC10743949 DOI: 10.3390/ijms242417549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Revised: 12/11/2023] [Accepted: 12/14/2023] [Indexed: 12/24/2023] Open
Abstract
Recently, the application of LiFePO4 (LFP) batteries in electric vehicles has attracted extensive attention from researchers. This work presents a composite of LFP particles trapped in reduced graphene oxide (rGO) nanosheets obtained through the high-temperature reduction strategy. The obtained LiFePO4/rGO composites indicate spherical morphology and uniform particles. As to the structure mode of the composite, LFP distributes in the interlayer structure of rGO, and the rGO evenly covers the surface of the particles. The LFP/rGO cathodes demonstrate a reversible specific capacity of 165 mA h g-1 and high coulombic efficiency at 0.2 C, excellent rate capacity (up to 10 C), outstanding long-term cycling stability (98%) after 1000 cycles at 5 C. The combined high electron conductivity of the layered rGO coating and uniform LFP particles contribute to the remarkable electrochemical performance of the LFP/rGO composite. The unique LFP/rGO cathode provides a potential application in high-power lithium-ion batteries.
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Affiliation(s)
- Qingao Zhang
- School of Chemical Science and Engineering, Qingdao University, Qingdao 266071, China
| | - Yu Zhou
- School of Chemical Science and Engineering, Qingdao University, Qingdao 266071, China
| | - Yulong Tong
- School of Chemical Science and Engineering, Qingdao University, Qingdao 266071, China
| | - Yuting Chi
- School of Chemical Science and Engineering, Qingdao University, Qingdao 266071, China
| | - Ruhua Liu
- School of Chemical Science and Engineering, Qingdao University, Qingdao 266071, China
| | - Changkai Dai
- School of Chemical Science and Engineering, Qingdao University, Qingdao 266071, China
| | - Zhanqing Li
- School of Chemical Science and Engineering, Qingdao University, Qingdao 266071, China
| | - Zhenli Cui
- School of Chemical Science and Engineering, Qingdao University, Qingdao 266071, China
| | - Yaohua Liang
- Department of Agricultural and Biosystems Engineering, South Dakota State University, Brookings, SD 57007, USA
| | - Yanli Tan
- School of Chemical Science and Engineering, Qingdao University, Qingdao 266071, China
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3
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Sun Y, Fu S, Sun S, Cui J, Luo Z, Lei Z, Hou Y. Design of a SnO 2/Zeolite Gas Sensor to Enhance Formaldehyde Sensing Properties: From the Strategy of the Band Gap-Tunable Zeolite. ACS APPLIED MATERIALS & INTERFACES 2023; 15:53714-53724. [PMID: 37935591 DOI: 10.1021/acsami.3c12789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2023]
Abstract
ZSM-5 zeolite is usually used in gas sensors as an auxiliary material to improve the gas-sensitive properties of other semiconductor materials, such as its molecular sieve properties and surface adsorption properties. Here, the gas-sensitive mechanism analysis of SnO2/zeolite gas sensors is studied for the first time based on the perspective of zeolite as a band gap-tunable semiconductor that was reported recently. The gas-sensing mechanism of the zeolite/semiconductor has been modeled based on the surface charge theory, and the work function of the ZSM-5 zeolite has been revealed for the first time. A heterostructure of Ag and ZSM-5 was designed and compounded to tune the band gap of the ZSM-5 zeolite by the ammonia pool effect method. The band gap width of the zeolite decreases from 4.51 to 3.61 eV. A series of characterization techniques were used to analyze the distribution and morphology of silver nanoparticles in zeolites and the variation of the ZSM-5 band gap. Then, SnO2/Ag@ZSM-5 sensors were fabricated, and the gas-sensing performances were measured. The gas-sensing results show that the SnO2/Ag@ZSM-5 sensor has an improved response to formaldehyde in particular compared to the SnO2 sensor. The response value of the SnO2/Ag@ZSM-5 sensor to 70 ppm formaldehyde reached 29.4, which is a 528% improvement compared to the SnO2 sensor. Additionally, the selectivity was greatly enhanced. This study provides a strategy for designing and developing higher-performance gas sensors.
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Affiliation(s)
- Yanhui Sun
- College of Information and Communication Engineering, Dalian Minzu University, Dalian 116600, China
- School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China
| | - Shouhang Fu
- College of Information and Communication Engineering, Dalian Minzu University, Dalian 116600, China
| | - Shupeng Sun
- School of Microelectronics, Dalian University of Technology, Dalian 116024, China
| | - Jiawen Cui
- College of Information and Communication Engineering, Dalian Minzu University, Dalian 116600, China
| | - Zhixin Luo
- College of Information and Communication Engineering, Dalian Minzu University, Dalian 116600, China
| | - Zefeng Lei
- College of Information and Communication Engineering, Dalian Minzu University, Dalian 116600, China
| | - Yue Hou
- KEDE Numerical Control Co., Ltd, Dalian 116100, China
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4
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Huang CY, Lin YC, Chung JHY, Chiu HY, Yeh NL, Chang SJ, Chan CH, Shih CC, Chen GY. Enhancing Cementitious Composites with Functionalized Graphene Oxide-Based Materials: Surface Chemistry and Mechanisms. Int J Mol Sci 2023; 24:10461. [PMID: 37445640 DOI: 10.3390/ijms241310461] [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: 05/19/2023] [Revised: 06/08/2023] [Accepted: 06/16/2023] [Indexed: 07/15/2023] Open
Abstract
Graphene oxide-based materials (GOBMs) have been widely explored as nano-reinforcements in cementitious composites due to their unique properties. Oxygen-containing functional groups in GOBMs are crucial for enhancing the microstructure of cementitious composites. A better comprehension of their surface chemistry and mechanisms is required to advance the potential applications in cementitious composites of functionalized GOBMs. However, the mechanism by which the oxygen-containing functional groups enhance the response of cementitious composites is still unclear, and controlling the surface chemistry of GOBMs is currently constrained. This review aims to investigate the reactions and mechanisms for functionalized GOBMs as additives incorporated in cement composites. A variety of GOBMs, including graphene oxide (GO), hydroxylated graphene (HO-G), edge-carboxylated graphene (ECG), edge-oxidized graphene oxide (EOGO), reduced graphene oxide (rGO), and GO/silane composite, are discussed with regard to their oxygen functional groups and interactions with the cement microstructure. This review provides insight into the potential benefits of using GOBMs as nano-reinforcements in cementitious composites. A better understanding of the surface chemistry and mechanisms of GOBMs will enable the development of more effective functionalization strategies and open up new possibilities for the design of high-performance cementitious composites.
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Affiliation(s)
- Chien-Yu Huang
- Department of Electrical and Computer Engineering, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 300, Taiwan
- Institute of Biomedical Engineering, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 300, Taiwan
| | - Yu-Chien Lin
- Institute of Biomedical Engineering, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 300, Taiwan
| | - Johnson H Y Chung
- ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, AIIM, Innovation Campus, University of Wollongong, Wollongong, NSW 2500, Australia
| | - Hsien-Yi Chiu
- Department of Dermatology, National Taiwan University Hospital Hsin-Chu Branch, Hsinchu 300, Taiwan
- Department of Medical Research, National Taiwan University Hospital Hsin-Chu Branch, Hsinchu 300, Taiwan
- Department of Dermatology, National Taiwan University Hospital, Taipei 100, Taiwan
- Department of Dermatology, College of Medicine, National Taiwan University, Taipei 100, Taiwan
| | - Nai-Lun Yeh
- Department of Family Medicine, National Taiwan University Hospital Hsin-Chu Branch, Hsinchu 300, Taiwan
| | - Shing-Jyh Chang
- Department of Obstetrics and Gynecology, Hsinchu Municipal MacKay Children's Hospital, Hsinchu 300, Taiwan
- Department of Nursing, Yuanpei University of Medical Technology, Hsinchu 300, Taiwan
| | - Chia-Hao Chan
- Department of Obstetrics and Gynecology, Hsinchu Municipal MacKay Children's Hospital, Hsinchu 300, Taiwan
| | - Chuan-Chi Shih
- Department of Obstetrics and Gynecology, Hsinchu Municipal MacKay Children's Hospital, Hsinchu 300, Taiwan
| | - Guan-Yu Chen
- Department of Electrical and Computer Engineering, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 300, Taiwan
- Institute of Biomedical Engineering, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 300, Taiwan
- Department of Biological Science and Technology, National Yang Ming Chiao Tung University, Hsinchu 300, Taiwan
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5
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Alnaji N, Wasfi A, Awwad F. The design of a point of care FET biosensor to detect and screen COVID-19. Sci Rep 2023; 13:4485. [PMID: 36934198 PMCID: PMC10024292 DOI: 10.1038/s41598-023-31679-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 03/15/2023] [Indexed: 03/19/2023] Open
Abstract
Graphene field effect transistor (FET) biosensors have attracted huge attention in the point-of-care and accurate detection. With the recent spread of the new emerging severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the need for rapid, and accurate detection & screening tools is arising. Employing these easy-to-handle sensors can offer cheap, rapid, and accurate detection. Herein, we propose the design of a reduced graphene oxide (rGO) FET biosensor for the detection of SARS-CoV-2. The main objective of this work is to detect the SARS-CoV-2 spike protein antigen on spot selectively and rapidly. The sensor consists of rGO channel, a pair of golden electrodes, and a gate underneath the channel. The channel is functionalized with COVID-19 spike protein antibodies to achieve selectivity, and with metal nanoparticles (MNPs) such as copper and silver to enhance the bio-sensing performance. The designed sensor successfully detects the SARS-CoV-2 spike protein and shows singular electrical behavior for detection. The semi-empirical modeling approach combined with none-equilibrium Green's function were used to study the electronic transport properties of the rGO-FET biosensor before and after the addition of the target molecules. The sensor's selectivity is also tested against other viruses. This study provides a promising guide for future practical fabrication.
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Affiliation(s)
- Nisreen Alnaji
- Department of Electrical and Communication Engineering, College of Engineering, United Arab Emirates University, P. O. Box 15551, Al Ain, United Arab Emirates
| | - Asma Wasfi
- Department of Electrical and Communication Engineering, College of Engineering, United Arab Emirates University, P. O. Box 15551, Al Ain, United Arab Emirates
- Zayed Center for Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Falah Awwad
- Department of Electrical and Communication Engineering, College of Engineering, United Arab Emirates University, P. O. Box 15551, Al Ain, United Arab Emirates.
- Zayed Center for Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates.
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6
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Casanova-Chafer J, Garcia-Aboal R, Atienzar P, Feliz M, Llobet E. Octahedral Molybdenum Iodide Clusters Supported on Graphene for Resistive and Optical Gas Sensing. ACS APPLIED MATERIALS & INTERFACES 2022; 14:57122-57132. [PMID: 36511821 PMCID: PMC9801382 DOI: 10.1021/acsami.2c15716] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Accepted: 11/30/2022] [Indexed: 06/15/2023]
Abstract
This paper reports for the first time a gas-sensitive nanohybrid based on octahedral molybdenum iodide clusters supported on graphene flakes (Mo6@Graphene). The possibility of integrating this material into two different transducing schemes for gas sensing is proposed since the nanomaterial changes both its electrical resistivity and optical properties when exposed to gases and at room temperature. Particularly, when implemented in a chemoresistive device, the Mo6@Graphene hybrid showed an outstanding sensing performance toward NO2, revealing a limit of quantification of about 10 ppb and excellent response repeatability (0.9% of relative error). While the Mo6@Graphene chemoresistor was almost insensitive to NH3, the use of an optical transduction scheme (changes in photoluminescence) provided an outstanding detection of NH3 even for a low loading of Mo6. Nevertheless, the photoluminescence was not affected by the presence of NO2. In addition, the hybrid material revealed high stability of its gas sensing properties over time and under ambient moisture. Computational chemistry calculations were performed to better understand these results, and plausible sensing mechanisms were presented accordingly. These results pave the way to develop a new generation of multi-parameter sensors in which electronic and optical interrogation techniques can be implemented simultaneously, advancing toward the realization of highly selective and orthogonal gas sensing.
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Affiliation(s)
- Juan Casanova-Chafer
- MINOS
Research Group, Department of Electronics Engineering, Universitat
Rovira i Virgili, Tarragona43007, Spain
| | - Rocio Garcia-Aboal
- Instituto
de Tecnología Química, Universitat
Politècnica de València - Consejo Superior de Investigaciones
Científicas (UPV-CSIC), Avd. de los Naranjos s/n, Valencia46022, Spain
| | - Pedro Atienzar
- Instituto
de Tecnología Química, Universitat
Politècnica de València - Consejo Superior de Investigaciones
Científicas (UPV-CSIC), Avd. de los Naranjos s/n, Valencia46022, Spain
| | - Marta Feliz
- Instituto
de Tecnología Química, Universitat
Politècnica de València - Consejo Superior de Investigaciones
Científicas (UPV-CSIC), Avd. de los Naranjos s/n, Valencia46022, Spain
| | - Eduard Llobet
- MINOS
Research Group, Department of Electronics Engineering, Universitat
Rovira i Virgili, Tarragona43007, Spain
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7
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Kou X, Zhang Y, Niu D, Han X, Ma L, Xu J. Polyethylene oxide-engineered graphene with rich mesopores anchoring Bi2O3 nanoparticles for boosting CO2 electroreduction to formate. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.141256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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8
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Synthesis and applicability of reduced graphene oxide/porphyrin nanocomposite as photocatalyst for waste water treatment and medical applications. Sci Rep 2022; 12:17075. [PMID: 36224230 PMCID: PMC9556635 DOI: 10.1038/s41598-022-21360-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Accepted: 09/26/2022] [Indexed: 01/04/2023] Open
Abstract
This study presents the synthesis and doping of reduced graphene oxide (rGO) with synthesized porphyrin (5,15-bisdodecyl porphyrin, C12P) nanoparticles to fabricate reduced graphene oxide-porphyrin (rGO-P) nanocomposite as well as demonstrates their outstanding removal activity of azo dye and antimicrobial potential. The synthesized porphyrin, rGO, and rGO-P nanocomposites were characterised using SEM, HRTEM, Raman spectroscopy, XRD, 1H-NMR, mass spectrometry, and UV-Visible spectroscopy. The ability of the synthesized rGO-P nanocomposite was then investigated (as catalyst and/or adsorbent) to impact its removal efficacy against Congo red (CR) as a well-known toxic, mutagenic and carcinogenic synthetic dye. The findings indicated that 0.01 g of rGO-P nanocomposite achieved 78.0% removal of CR at pH 3.0. Besides, the removal efficacy was evaluated while studying many aspects i.e. pH, CR initial concentration, and rGO-P nanocomposite amount. Moreover, the minimum inhibitory concentration (MIC) and zone of inhibition (ZOI) of antimicrobial activity against pathogenic bacteria and yeast were evaluated. The antimicrobial results showed that rGO-P nanocomposite revealed the greatest antimicrobial activity against Candida albicans, Enterococcus faecalis, and Staphylococcus aureus with ZOI values of 24.3, 21.8, and 22.1 mm, respectively. Consequently, it demonstrates the substantial potential of rGO-P nanocomposite in the effective removal of pollutant dyes as well as significant antibacterial and antifungal properties.
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9
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Golze D, Hirvensalo M, Hernández-León P, Aarva A, Etula J, Susi T, Rinke P, Laurila T, Caro MA. Accurate Computational Prediction of Core-Electron Binding Energies in Carbon-Based Materials: A Machine-Learning Model Combining Density-Functional Theory and GW. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2022; 34:6240-6254. [PMID: 35910537 PMCID: PMC9330771 DOI: 10.1021/acs.chemmater.1c04279] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 06/30/2022] [Indexed: 06/15/2023]
Abstract
We present a quantitatively accurate machine-learning (ML) model for the computational prediction of core-electron binding energies, from which X-ray photoelectron spectroscopy (XPS) spectra can be readily obtained. Our model combines density functional theory (DFT) with GW and uses kernel ridge regression for the ML predictions. We apply the new approach to disordered materials and small molecules containing carbon, hydrogen, and oxygen and obtain qualitative and quantitative agreement with experiment, resolving spectral features within 0.1 eV of reference experimental spectra. The method only requires the user to provide a structural model for the material under study to obtain an XPS prediction within seconds. Our new tool is freely available online through the XPS Prediction Server.
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Affiliation(s)
- Dorothea Golze
- Faculty
of Chemistry and Food Chemistry, Technische
Universität Dresden, 01062 Dresden, Germany
- Department
of Applied Physics, Aalto University, 02150 Espoo, Finland
| | - Markus Hirvensalo
- Department
of Applied Physics, Aalto University, 02150 Espoo, Finland
| | | | - Anja Aarva
- Department
of Electrical Engineering and Automation, Aalto University, 02150 Espoo, Finland
| | - Jarkko Etula
- Department
of Chemistry and Materials Science, Aalto
University, 02150 Espoo, Finland
| | - Toma Susi
- University
of Vienna, Faculty of Physics, Boltzmanngasse 5, 1090 Vienna, Austria
| | - Patrick Rinke
- Department
of Applied Physics, Aalto University, 02150 Espoo, Finland
| | - Tomi Laurila
- Department
of Electrical Engineering and Automation, Aalto University, 02150 Espoo, Finland
- Department
of Chemistry and Materials Science, Aalto
University, 02150 Espoo, Finland
| | - Miguel A. Caro
- Department
of Electrical Engineering and Automation, Aalto University, 02150 Espoo, Finland
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Norizan MN, Abdullah N, Halim NA, Demon SZN, Mohamad IS. Heterojunctions of rGO/Metal Oxide Nanocomposites as Promising Gas-Sensing Materials—A Review. NANOMATERIALS 2022; 12:nano12132278. [PMID: 35808113 PMCID: PMC9268638 DOI: 10.3390/nano12132278] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 06/21/2022] [Accepted: 06/25/2022] [Indexed: 01/25/2023]
Abstract
Monitoring environmental hazards and pollution control is vital for the detection of harmful toxic gases from industrial activities and natural processes in the environment, such as nitrogen dioxide (NO2), ammonia (NH3), hydrogen (H2), hydrogen sulfide (H2S), carbon dioxide (CO2), and sulfur dioxide (SO2). This is to ensure the preservation of public health and promote workplace safety. Graphene and its derivatives, especially reduced graphene oxide (rGO), have been designated as ideal materials in gas-sensing devices as their electronic properties highly influence the potential to adsorb specified toxic gas molecules. Despite its exceptional sensitivity at low gas concentrations, the sensor selectivity of pristine graphene is relatively weak, which limits its utility in many practical gas sensor applications. In view of this, the hybridization technique through heterojunction configurations of rGO with metal oxides has been explored, which showed promising improvement and a synergistic effect on the gas-sensing capacity, particularly at room temperature sensitivity and selectivity, even at low concentrations of the target gas. The unique features of graphene as a preferential gas sensor material are first highlighted, followed by a brief discussion on the basic working mechanism, fabrication, and performance of hybridized rGO/metal oxide-based gas sensors for various toxic gases, including NO2, NH3, H2, H2S, CO2, and SO2. The challenges and prospects of the graphene/metal oxide-based based gas sensors are presented at the end of the review.
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Affiliation(s)
- Mohd Nurazzi Norizan
- Centre for Defence Foundation Studies, National Defence University of Malaysia, Kem Sungai Besi, Kuala Lumpur 57000, Malaysia; (M.N.N.); (N.A.H.); (S.Z.N.D.)
| | - Norli Abdullah
- Centre for Defence Foundation Studies, National Defence University of Malaysia, Kem Sungai Besi, Kuala Lumpur 57000, Malaysia; (M.N.N.); (N.A.H.); (S.Z.N.D.)
- Correspondence:
| | - Norhana Abdul Halim
- Centre for Defence Foundation Studies, National Defence University of Malaysia, Kem Sungai Besi, Kuala Lumpur 57000, Malaysia; (M.N.N.); (N.A.H.); (S.Z.N.D.)
| | - Siti Zulaikha Ngah Demon
- Centre for Defence Foundation Studies, National Defence University of Malaysia, Kem Sungai Besi, Kuala Lumpur 57000, Malaysia; (M.N.N.); (N.A.H.); (S.Z.N.D.)
| | - Imran Syakir Mohamad
- Faculty of Mechanical Engineering, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, Durian Tunggal, Melaka 76100, Malaysia;
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11
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Huang SD, Chu ED, Wang YH, Liou JW, Wang RS, Woon WY, Chiu HC. Variations in the Effective Work Function of Graphene in a Sliding Electrical Contact Interface under Ambient Conditions. ACS APPLIED MATERIALS & INTERFACES 2022; 14:27328-27338. [PMID: 35438951 DOI: 10.1021/acsami.2c02096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Control of work function (WF) in graphene is crucial for graphene application in electrode material replacement and electrode surface protection in optoelectronic devices. Although efforts have been made to manipulate the effective WF of graphene to optimize its application, most studies have focused on graphene employed in static electrical contact interfaces. In this work, we investigated WF variations of supported single-layer graphene (SLG) in sliding electrical contact under ambient conditions, which was achieved by sliding an electrically biased conductive atomic force microscopy (cAFM) probe on the SLG surface. The effective WF, structural properties, and chemical compositions of rubbed SLG were subsequently measured by Kelvin probe force microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy, respectively. We found that the effective WF of the rubbed SLG was governed by both the tunneling triboelectric effect (TTE) and tribochemical-induced surface functionalization. The TTE charges generated by the sliding cAFM probe tunneled through the structural defects of the SLG and were trapped underneath the SLG. The SLG will be either p-doped or n-doped depending on the type of TTE charges and the polarity of electric bias applied to the cAFM probe during the rubbing process. However, the applied electric bias also led to the electrolysis of a water meniscus formed at the cAFM probe-SLG contact, resulting in surface oxidation and the increase of SLG WF. Further absorption of ambient water molecules on the oxygenated functional groups gradually reduced the SLG WF. The influence of TTE and surface functionalization on the SLG WF depends on the magnitude and polarity of applied electric biases, relative humidity, and physical properties of the supporting substrates. Our results demonstrate that the effective WF of SLG in a sliding electrical contact interface will vary with time and might need to be considered for related applications.
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Affiliation(s)
- Shuei-De Huang
- Department of Physics, National Taiwan Normal University, Taipei 11677, Taiwan
| | - En-De Chu
- Department of Physics, National Taiwan Normal University, Taipei 11677, Taiwan
| | - Yu-Han Wang
- Molecular Science and Technology Program, Taiwan International Graduate Program, Institute of Atomic and Molecular Science, Academia Sinica, Taipei 10617, Taiwan
- Department of Physics, National Central University, Taoyuan 32001, Taiwan
| | - Jhe-Wei Liou
- Molecular Science and Technology Program, Taiwan International Graduate Program, Institute of Atomic and Molecular Science, Academia Sinica, Taipei 10617, Taiwan
| | - Ruei-Si Wang
- Department of Physics, National Taiwan Normal University, Taipei 11677, Taiwan
| | - Wei-Yen Woon
- Molecular Science and Technology Program, Taiwan International Graduate Program, Institute of Atomic and Molecular Science, Academia Sinica, Taipei 10617, Taiwan
- Department of Physics, National Central University, Taoyuan 32001, Taiwan
| | - Hsiang-Chih Chiu
- Department of Physics, National Taiwan Normal University, Taipei 11677, Taiwan
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12
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He J, Zheng B, Xie Y, Qian YY, Zhang J, Wang K, Yang L, Yu HT. Effects of adatom species on the structure, stability, and work function of adatom-α-borophene nanocomposites. Phys Chem Chem Phys 2022; 24:8923-8939. [PMID: 35373802 DOI: 10.1039/d2cp00506a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Work function-tunable borophene-based electrode materials are of significant importance because they promote efficient carrier extraction/injection, thereby enabling electronic devices to achieve maximum energy conversion efficiency. Accordingly, determining the work function of adatom-borophene nanocomposites within a series wherein the adatom is systematically changed will facilitate the design of such materials. In this study, we theoretically determined that the M-B bond length, binding energy, electron transfer between adatoms and BBP, and work function (ϕ) are linearly dependent on the ionization potential (IP) and electronegativity for thermodynamically and kinetically stable adatom-α-borophene (M/BBP) systems involving a series of alkali (earth) metal/BBP (M = Li-Cs; Be-Ba) and halogen/BBP (M = F-I), respectively. However, the binding energies of Li/BBP and Be/BBP deviate from these dependencies owing to their super small adatoms and the resulting significantly enhanced effective M-B bonding areas. By interpreting the electron transfer picture among the different parts of M/BBP, we confirmed that metallic M/BBP possesses ionic sp-p and dsp-p M-B bonds in alkali (earth) metal/BBP but covalent-featured ionic p-p interactions in halogen/BBP. In particular, the direct proportionality between IP and ϕ for alkali (earth) metal/BBP originates from the synergistic effect of charge rearrangement and the increased induced dipole moment; however, the inverse proportionality between electronegativity and ϕ for halogen/BBP arises from the adsorption induced charge redistribution. Our results provide guidance for experimental efforts toward the realization of work function-tunable borophene-based electrodes as well as insight into the bonding rules between various adatoms and α-borophene.
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Affiliation(s)
- Jing He
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science, Heilongjiang University, Harbin, 150080, P. R. China.
| | - Bing Zheng
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science, Heilongjiang University, Harbin, 150080, P. R. China.
| | - Ying Xie
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science, Heilongjiang University, Harbin, 150080, P. R. China.
| | - Yin-Yin Qian
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science, Heilongjiang University, Harbin, 150080, P. R. China.
| | - Jiao Zhang
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science, Heilongjiang University, Harbin, 150080, P. R. China.
| | - Ke Wang
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science, Heilongjiang University, Harbin, 150080, P. R. China.
| | - Lin Yang
- National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, P. R. China.,School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - Hai-Tao Yu
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science, Heilongjiang University, Harbin, 150080, P. R. China.
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13
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Qiao Z, Wang C, Zeng Y, Spendelow JS, Wu G. Advanced Nanocarbons for Enhanced Performance and Durability of Platinum Catalysts in Proton Exchange Membrane Fuel Cells. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2006805. [PMID: 34061449 DOI: 10.1002/smll.202006805] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 02/28/2021] [Indexed: 06/12/2023]
Abstract
Insufficient stability of current carbon supported Pt and Pt alloy catalysts is a significant barrier for proton-exchange membrane fuel cells (PEMFCs). As a primary degradation cause to trigger Pt nanoparticle migration, dissolution, and aggregation, carbon corrosion remains a significant challenge. Compared with enhancing Pt and PtM alloy particle stability, improving support stability is rather challenging due to carbon's thermodynamic instability under fuel cell operation. In recent years, significant efforts have been made to develop highly durable carbon-based supports concerning innovative nanostructure design and synthesis along with mechanistic understanding. This review critically discusses recent progress in developing carbon-based materials for Pt catalysts and provides synthesis-structure-performance correlations to elucidate underlying stability enhancement mechanisms. The mechanisms and impacts of carbon support degradation on Pt catalyst performance are first discussed. The general strategies are summarized to tailor the carbon structures and strengthen the metal-support interactions, followed by discussions on how these designs lead to enhanced support stability. Based on current experimental and theoretical studies, the critical features of carbon supports are analyzed concerning their impacts on the performance and durability of Pt catalysts in fuel cells. Finally, the perspectives are shared on future directions to develop advanced carbon materials with favorable morphologies and nanostructures to increase Pt utilization, strengthen metal-support interactions, facilitate mass/charge transfer, and enhance corrosion resistance.
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Affiliation(s)
- Zhi Qiao
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Chenyu Wang
- Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Yachao Zeng
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Jacob S Spendelow
- Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Gang Wu
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
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14
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Méndez‐Romero UA, Velasco‐Soto MA, Licea‐Jiménez L, González‐Hernández J, Pérez‐García SA. Long‐term evolution of the chemical and structural stability of graphene oxide after storage as solid and as aqueous dispersion. NANO SELECT 2021. [DOI: 10.1002/nano.202000274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Affiliation(s)
- Ulises Antonio Méndez‐Romero
- Centro de Investigación en Materiales Avanzados S.C. (CIMAV) Unidad Monterrey Autopista Monterrey‐Aeropuerto Km 10, Alianza Norte 202 Apodaca NL CP 66628 México
- Department of Chemistry and Chemical Engineering Chalmers University of Technology Göteborg SE‐412 96 Sweden
- Group of Polymer Nanocomposites (CIMAV) Unidad Monterrey Autopista Monterrey‐Aeropuerto Km 10, Alianza Norte 202 Apodaca NL CP 66628 México
| | - Miguel Angel Velasco‐Soto
- Department of Chemistry and Nanotechnology School of Engineering and Sciences Tecnológico de Monterrey, Av. E. Garza Sada 2501 Sur Monterrey NL 64849 México
| | - Liliana Licea‐Jiménez
- Centro de Investigación en Materiales Avanzados S.C. (CIMAV) Unidad Monterrey Autopista Monterrey‐Aeropuerto Km 10, Alianza Norte 202 Apodaca NL CP 66628 México
- Group of Polymer Nanocomposites (CIMAV) Unidad Monterrey Autopista Monterrey‐Aeropuerto Km 10, Alianza Norte 202 Apodaca NL CP 66628 México
| | - Jesús González‐Hernández
- Centro de Investigación y de Estudios Avanzados del I.P.N. Unidad Querétaro Apdo. Postal 1–798, 76001 Querétaro Qro México
| | - Sergio Alfonso Pérez‐García
- Centro de Investigación en Materiales Avanzados S.C. (CIMAV) Unidad Monterrey Autopista Monterrey‐Aeropuerto Km 10, Alianza Norte 202 Apodaca NL CP 66628 México
- Group of Polymer Nanocomposites (CIMAV) Unidad Monterrey Autopista Monterrey‐Aeropuerto Km 10, Alianza Norte 202 Apodaca NL CP 66628 México
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15
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Gómez-Pérez J, Pravda Bartus C, Szamosvölgyi Á, Sapi A, Kónya Z, Kukovecz Á. Electronic work function modulation of phosphorene by thermal oxidation. 2D MATERIALS 2021. [DOI: 10.1088/2053-1583/ac2f21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Abstract
In this study, we evaluate the variation of the work function of phosphorene during thermal oxidation at different temperatures. The ultraviolet photoelectron spectroscopy results show an N-shaped behaviour that is explained by the oxidation process and the dangling-to-interstitial conversion at elevated temperatures. The exfoliation degree and x-ray photoelectron spectroscopy confirm the formation of native oxides in the top-most layer that passivates the material. Ex-situ XPS reveals the full oxidation of monolayers at temperatures higher than 140 °C, but few-layer phosphorene withstands the thermal oxidation even up to 200 °C with slight modifications of the A
2
g/A
1
g and A
2
g/B
2g vibrational mode ratios and a weak fluorescence in the Raman spectra of the heat-treated samples.
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16
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Wang Z, Cao Q, Sotthewes K, Hu Y, Shin HS, Eigler S. Interlayer electron modulation in van der Waals heterostructures assembled by stacking monolayer MoS 2 onto monolayer graphene with different electron transfer ability. NANOSCALE 2021; 13:15464-15470. [PMID: 34505854 DOI: 10.1039/d1nr03708k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Achieving tunable optoelectronic properties and clarifying interlayer interactions are key challenges in the development of 2D heterostructures. Herein, we report the feasible modulation of the optoelectronic properties of monolayer MoS2 (1L-MoS2) on three different graphene monolayers with varying ability in extracting electrons. Monolayer oxygen-functionalized graphene (1L-oxo-G, a high amount of oxygen of 60%) with a work function (WF) of 5.67 eV and its lowly oxidized reduction product, namely reduced-oxo-G (1L-r-oxo-G, a low amount of oxygen of 0.1%), with a WF of 5.85 eV serving as hole injection layers significantly enhance the photoluminescence (PL) intensity of MoS2, whereas pristine monolayer graphene (1L-G) with a work function (WF) of 5.02 eV results in PL quenching of MoS2. The enhancement in the PL intensity is due to increase of neutral exciton recombination. Furthermore, 1L-r-oxo-G/MoS2 exhibited a higher increase (5-fold) in PL than 1L-oxo-G/MoS2 (3-fold). Our research can help modulate the carrier concentration and electronic type of 1L-MoS2 and has promising applications in optoelectronic devices.
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Affiliation(s)
- Zhenping Wang
- Department of Chemistry, Low-Dimensional Carbon and 2D Materials Center, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea.
| | - Qing Cao
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Takustraße 3, 14195 Berlin, Germany.
| | - Kai Sotthewes
- Physics of Interfaces and Nanomaterials, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500AE Enschede, The Netherlands
| | - Yalei Hu
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Takustraße 3, 14195 Berlin, Germany.
| | - Hyeon S Shin
- Department of Chemistry, Low-Dimensional Carbon and 2D Materials Center, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea.
| | - Siegfried Eigler
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Takustraße 3, 14195 Berlin, Germany.
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17
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Raslan A, Ciriza J, Ochoa de Retana AM, Sanjuán ML, Toprak MS, Galvez-Martin P, Saenz-del-Burgo L, Pedraz JL. Modulation of Conductivity of Alginate Hydrogels Containing Reduced Graphene Oxide through the Addition of Proteins. Pharmaceutics 2021; 13:1473. [PMID: 34575549 PMCID: PMC8470000 DOI: 10.3390/pharmaceutics13091473] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 09/03/2021] [Accepted: 09/07/2021] [Indexed: 11/17/2022] Open
Abstract
Modifying hydrogels in order to enhance their conductivity is an exciting field with applications in cardio and neuro-regenerative medicine. Therefore, we have designed hybrid alginate hydrogels containing uncoated and protein-coated reduced graphene oxide (rGO). We specifically studied the adsorption of three different proteins, BSA, elastin, and collagen, and the outcomes when these protein-coated rGO nanocomposites are embedded within the hydrogels. Our results demonstrate that BSA, elastin, and collagen are adsorbed onto the rGO surface, through a non-spontaneous phenomenon that fits Langmuir and pseudo-second-order adsorption models. Protein-coated rGOs are able to preclude further adsorption of erythropoietin, but not insulin. Collagen showed better adsorption capacity than BSA and elastin due to its hydrophobic nature, although requiring more energy. Moreover, collagen-coated rGO hybrid alginate hydrogels showed an enhancement in conductivity, showing that it could be a promising conductive scaffold for regenerative medicine.
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Affiliation(s)
- Ahmed Raslan
- NanoBioCel Group, Laboratory of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of the Basque Country UPV/EHU, 01006 Vitoria-Gasteiz, Spain;
| | - Jesús Ciriza
- Biomedical Research Networking Center in Bioengineering, Biomaterials, and Nanomedicine, CIBER-BBN, Paseo de la Universidad 7, 01006 Vitoria-Gasteiz, Spain;
- Tissue Microenvironment (TME) Lab, Aragón Institute of Engineering Research (I3A), University of Zaragoza, C/Mariano Esquillor s/n, 50018 Zaragoza, Spain
- Institute for Health Research Aragón (IIS Aragón), 50009 Zaragoza, Spain
| | - Ana María Ochoa de Retana
- Department of Organic Chemistry I, Faculty of Pharmacy and Lascaray Research Center, University of the Basque Country (UPV/EHU), Paseo de la Universidad 7, 01006 Vitoria-Gasteiz, Spain;
| | - María Luisa Sanjuán
- Instituto de Ciencia de Materiales de Aragón (Universidad de Zaragoza-CSIC), Facultad de Ciencias, 50009 Zaragoza, Spain;
| | - Muhammet S. Toprak
- Biomedical and X-ray Physics, Department of Applied Physics, KTH-Royal Institute of Technology, 10691 Stockholm, Sweden;
| | | | - Laura Saenz-del-Burgo
- NanoBioCel Group, Laboratory of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of the Basque Country UPV/EHU, 01006 Vitoria-Gasteiz, Spain;
- Biomedical Research Networking Center in Bioengineering, Biomaterials, and Nanomedicine, CIBER-BBN, Paseo de la Universidad 7, 01006 Vitoria-Gasteiz, Spain;
- Bioaraba Health Research Institute, Jose Atxotegi, s/n, 01009 Vitoria-Gasteiz, Spain
| | - Jose Luis Pedraz
- NanoBioCel Group, Laboratory of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of the Basque Country UPV/EHU, 01006 Vitoria-Gasteiz, Spain;
- Biomedical Research Networking Center in Bioengineering, Biomaterials, and Nanomedicine, CIBER-BBN, Paseo de la Universidad 7, 01006 Vitoria-Gasteiz, Spain;
- Bioaraba Health Research Institute, Jose Atxotegi, s/n, 01009 Vitoria-Gasteiz, Spain
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18
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Aarva A, Sainio S, Deringer VL, Caro MA, Laurila T. X-ray Spectroscopy Fingerprints of Pristine and Functionalized Graphene. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2021; 125:18234-18246. [PMID: 34476042 PMCID: PMC8404192 DOI: 10.1021/acs.jpcc.1c03238] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Revised: 07/24/2021] [Indexed: 06/13/2023]
Abstract
In this work, we demonstrate how to identify and characterize the atomic structure of pristine and functionalized graphene materials from a combination of computational simulation of X-ray spectra, on the one hand, and computer-aided interpretation of experimental spectra, on the other. Despite the enormous scientific and industrial interest, the precise structure of these 2D materials remains under debate. As we show in this study, a wide range of model structures from pristine to heavily oxidized graphene can be studied and understood with the same approach. We move systematically from pristine to highly oxidized and defective computational models, and we compare the simulation results with experimental data. Comparison with experiments is valuable also the other way around; this method allows us to verify that the simulated models are close to the real samples, which in turn makes simulated structures amenable to several computational experiments. Our results provide ab initio semiquantitative information and a new platform for extended insight into the structure and chemical composition of graphene-based materials.
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Affiliation(s)
- Anja Aarva
- Department
of Electrical Engineering and Automation, School of Electrical Engineering, Aalto University, 02150 Espoo, Finland
| | - Sami Sainio
- Stanford
Synchrotron Radiation Lightsource, SLAC
National Accelerator Laboratory, Menlo Park, California 94025, United States
- Microelectronics
Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O.
Box. 4500, 90570 Oulu, Finland
| | - Volker L. Deringer
- Department
of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, Oxford OX1 3QR, U.K.
| | - Miguel A. Caro
- Department
of Electrical Engineering and Automation, School of Electrical Engineering, Aalto University, 02150 Espoo, Finland
| | - Tomi Laurila
- Department
of Electrical Engineering and Automation, School of Electrical Engineering, Aalto University, 02150 Espoo, Finland
- Department
of Chemistry and Materials Science, Aalto
University, Kemistintie
1, 02150 Espoo, Finland
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19
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Sahu BK, Juine RN, Sahoo M, Kumar R, Das A. Interface of GO with SnO 2 quantum dots as an efficient visible-light photocatalyst. CHEMOSPHERE 2021; 276:130142. [PMID: 33744649 DOI: 10.1016/j.chemosphere.2021.130142] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 02/18/2021] [Accepted: 02/26/2021] [Indexed: 06/12/2023]
Abstract
Graphene oxide (GO) with beneficial functional groups regulates the surface chemistry for catalytic applications. However, the low electrical conductivity of GO invokes further treatments that compromise the above-valued properties. We report an interfacial engineering of GO decorated with SnO2 quantum dots (QDs) for the visible-light-driven catalysis of dye degradation. Retention of beneficial functional features of GO and QDs in the GO-SnO2 composite is established by using TEM, FTIR, and Raman spectroscopy techniques. Further, investigations with EXAFS and lifetime-measurements provide the local structure and defects distributions in QDs which are correlated with the improved conductivity. PL and electrochemical impedance spectroscopic measurements help unraveling the charge-transfer across the interface of the GO-SnO2 composite. The unique ability of ∼94% degradation of MB using only 0.5 mg of GO-SnO2 catalyst within half an hour under the visible light is demonstrated for the first time with insights on the photocatalytic mechanism.
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Affiliation(s)
- Binaya Kumar Sahu
- Surface and Nanoscience Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam, 603102, India.
| | - Rabindra Nath Juine
- Health Physics Unit, Nuclear Recycle Board, Bhabha Atomic Research Centre Facilities, HBNI, Kalpakkam, 603102, India
| | - Madhusmita Sahoo
- Surface and Nanoscience Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam, 603102, India
| | - Ravi Kumar
- Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - A Das
- Surface and Nanoscience Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam, 603102, India.
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20
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Hu Q, Cao Y, Liu Y, Wang Y, Wang C, Zhu JL, Yang N, Chu W, Ma W, Sun JL. Ultra-wideband self-powered photodetector based on suspended reduced graphene oxide with asymmetric metal contacts. RSC Adv 2021; 11:19482-19491. [PMID: 35479257 PMCID: PMC9033575 DOI: 10.1039/d1ra03438c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2021] [Accepted: 05/19/2021] [Indexed: 12/28/2022] Open
Abstract
The ultraviolet to terahertz band forms the main focus of optoelectronics research, while light detection in different bands generally requires the use of different materials and processing methods. However, researchers are aiming to realize multi-band detection simultaneously in the same device in certain specific application scenarios and ultra-wideband photoelectric detectors can also realize multi-function and multi-system integration. Therefore, the research and development work on ultra-wideband photoelectric detectors has important practical application value. Here, we produced self-powered suspended Pd-reduced graphene oxide-Ti (Pd-rGO-Ti) photodetectors. We varied the properties of the rGO films by using different annealing temperatures and achieved p-doping and n-doping of the films by evaporating palladium films and titanium films, respectively, thus enabling preparation of photothermoelectric (PTE) photodetectors based on rGO films. The resulting detectors have excellent photoelectric responses over a wideband illumination wavelength range from 375 nm to 118.8 μm (2.52 THz). At the same time, we determined the best experimental conditions and device structure by varying the channel width, the laser spot irradiation position and the experimental atmospheric pressure. The maximum responsivity obtained from our detectors is 142.08 mV W−1, the response time is approximately 100–200 ms and the devices have high detection sensitivity. Based on this work, we assumed in the subsequent experiments that detectors with higher performance can be obtained by reducing the channel width and atmospheric pressure. With advantages that include simple fabrication, low cost, large-scale production potential and ultra-wideband responses, these Pd-rGO-Ti photodetectors have broad application prospects in high-performance integrated optoelectronics. An ultra-wideband self-powered photodetector based on suspended reduced graphene oxide with asymmetric metal contacts is reported.![]()
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Affiliation(s)
- Qianqian Hu
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University Beijing 100084 P. R. China
| | - Yang Cao
- School of Instrumentation Science and Opto-electronics Engineering, Beijing Information Science & Technology University Beijing 100192 P. R. China.,National Engineering Laboratory for Dangerous Articles and Explosives Detection Technologies Beijing 100084 P. R. China
| | - Yu Liu
- School of Mechanical Engineering and Automation, Fuzhou University Fuzhou 350108 P. R. China
| | - Yingxin Wang
- Key Laboratory of Particle & Radiation Imaging, Ministry of Education, Department of Engineering Physics, Tsinghua University Beijing 100084 P. R. China
| | - Chenfeng Wang
- School of Instrumentation Science and Opto-electronics Engineering, Beijing Information Science & Technology University Beijing 100192 P. R. China
| | - Jia-Lin Zhu
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University Beijing 100084 P. R. China
| | - Ning Yang
- Institute of Applied Physics and Computational Mathematics P.O.Box 8009 (28) Beijing 100088 P. R. China
| | - Weidong Chu
- Institute of Applied Physics and Computational Mathematics P.O.Box 8009 (28) Beijing 100088 P. R. China
| | - Wanyun Ma
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University Beijing 100084 P. R. China
| | - Jia-Lin Sun
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University Beijing 100084 P. R. China
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21
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Kustov LM, Redina EA, Tkachenko OP, Kustov AL, Kazansky VB. Spectral Study of the Inverse Effect of Metal on the Properties of a Carrier. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2020. [DOI: 10.1134/s0036024420110187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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22
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Bae G, Song DS, Lim YR, Jeon IS, Jang M, Yoon Y, Jeon C, Song W, Myung S, Lee SS, Park CY, An KS. Chemical Patterning of Graphene via Metal-Assisted Highly Energetic Electron Irradiation for Graphene Homojunction-Based Gas Sensors. ACS APPLIED MATERIALS & INTERFACES 2020; 12:47802-47810. [PMID: 32985173 DOI: 10.1021/acsami.0c12063] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
To gain the target functionality of graphene for gas detection, nonfocused and large-scale compatible MeV electron beam irradiation on graphene with Ag patterns is innovatively adopted in air for chemical patterning of graphene. This strategy allows the metal-assisted site-specific oxidation of graphene to realize monolithically integrated graphene-chemically patterned graphene (CPG)-graphene homojunction-based gas sensors. The size-tunable CPG patterns can be mediated by regulating the size of Ag prepatterns. The impacts of highly energetic electron irradiation (HEEI) on graphene are summarized as follows: (i) the selective p-type doping and the defect generation of graphene by the HEEI-induced oxidation, (ii) the resistance of the homojunction devices manipulated by the HEEI dose, (iii) the band gap opening of graphene as well as the lowering of the Fermi level, (iv) the work function values for pristine graphene and CPG corresponding to 4.14 and 4.88 eV, respectively, and (v) graphene-CPG-graphene homojunction for NO2 gas, revealing an 839% enhanced gas response compared with that of the pristine graphene-based gas sensor.
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Affiliation(s)
- Garam Bae
- Thin Film Materials Research Center, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Republic of Korea
- Department of Physics, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon 16419, Republic of Korea
| | - Da Som Song
- Thin Film Materials Research Center, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Republic of Korea
| | - Yi Rang Lim
- Thin Film Materials Research Center, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Republic of Korea
| | - In Su Jeon
- Thin Film Materials Research Center, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Republic of Korea
| | - Moonjeong Jang
- Thin Film Materials Research Center, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Republic of Korea
| | - Yeoheung Yoon
- Thin Film Materials Research Center, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Republic of Korea
| | - Cheolho Jeon
- Advanced Nano Surface Research Group, Korea Basic Science Institute, Daejeon 34133, Republic of Korea
| | - Wooseok Song
- Thin Film Materials Research Center, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Republic of Korea
| | - Sung Myung
- Thin Film Materials Research Center, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Republic of Korea
| | - Sun Sook Lee
- Thin Film Materials Research Center, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Republic of Korea
| | - Chong-Yun Park
- Department of Physics, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon 16419, Republic of Korea
| | - Ki-Seok An
- Thin Film Materials Research Center, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Republic of Korea
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23
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Yang J, Jia Y, Fan C, Cheng Y, Pan C, Huang B, Meng X, Zhang J, Zheng A, Ma X, Li X, Luque R, Sun Y. Aqueous Room Temperature Mono-Dehydration of Sugar Alcohols Using Functionalized Yttrium Oxide Nanocatalysts. Front Chem 2020; 8:532. [PMID: 32793546 PMCID: PMC7390900 DOI: 10.3389/fchem.2020.00532] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 05/25/2020] [Indexed: 11/13/2022] Open
Abstract
The aqueous room temperature mono-dehydration of sugar alcohols (D-sorbitol and D-mannitol) was conducted using functionalized yttrium oxide nanocatalysts prepared via sol-gel methods. Materials exhibited high selectivity to mono-dehydration products. Solvent and catalyst effects were also investigated and discussed. The introduction of titanium into the yttrium oxide framework would decrease both substrate conversion and mono-dehydration efficiency. In addition, studies of the catalytic mechanism indicate high mono-dehydration efficiency may come from the stability of the formed intermediate during catalysis. This work provides a highly efficient and benign system for catalytic mono-dehydration of sugar alcohols.
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Affiliation(s)
- Juncheng Yang
- Department of Applied Chemistry, School of Science, Xi'an Jiaotong University, Xi'an, China
| | - Yihong Jia
- Department of Applied Chemistry, School of Science, Xi'an Jiaotong University, Xi'an, China
| | - Chao Fan
- Department of Applied Chemistry, School of Science, Xi'an Jiaotong University, Xi'an, China
| | - Yu Cheng
- Shaanxi Key Laboratory of Ophthalmology, Clinical Research Center for Ophthalmology Diseases of Shaanxi Province, Shaanxi Institute of Ophthalmology, Xi'an No. 1 Hospital, First Affiliated Hospital of Northwestern University, Xi'an, China
| | - Cheng Pan
- Department of Applied Chemistry, School of Science, Xi'an Jiaotong University, Xi'an, China
| | - Benhua Huang
- Department of Applied Chemistry, School of Science, Xi'an Jiaotong University, Xi'an, China
| | - Xu Meng
- School of Material Science and Engineering, Xi'an University of Science and Technology, Xi'an, China
| | - Junjie Zhang
- Department of Applied Chemistry, School of Science, Xi'an Jiaotong University, Xi'an, China
| | - Aqun Zheng
- Department of Applied Chemistry, School of Science, Xi'an Jiaotong University, Xi'an, China
| | - Xiaomo Ma
- College of Humanities and Social Sciences, Xi'an Jiaotong University, Xi'an, China
| | - Xiaoyong Li
- Department of Applied Chemistry, School of Science, Xi'an Jiaotong University, Xi'an, China
| | - Rafael Luque
- Department of Applied Chemistry, School of Science, Xi'an Jiaotong University, Xi'an, China.,Departamento de Quimica Organica, Universidad de Cordoba, Cordoba, Spain
| | - Yang Sun
- Department of Applied Chemistry, School of Science, Xi'an Jiaotong University, Xi'an, China
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Valentini L, Bittolo Bon S, Giorgi G. Engineering Graphene Oxide/Water Interface from First Principles to Experiments for Electrostatic Protective Composites. Polymers (Basel) 2020; 12:E1596. [PMID: 32708367 PMCID: PMC7407558 DOI: 10.3390/polym12071596] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 07/08/2020] [Accepted: 07/16/2020] [Indexed: 11/17/2022] Open
Abstract
From the global spread of COVID-19 we learned that SARS-CoV-2 virus can be transmitted via respiratory liquid droplets. In this study, we performed first-principles calculations suggesting that water molecules once in contact with the graphene oxide (GO) layer interact with its functional groups, therefore, developing an electric field induced by the heterostructure formation. Experiments on GO polymer composite film supports the theoretical findings, showing that the interaction with water aerosol generates a voltage output signal of up to -2 V. We then developed an electrostatic composite fiber by the coagulation method mixing GO with poly(methyl methacrylate) (PMMA). These findings could be used to design protective fabrics with antiviral activity against negatively charged spike proteins of airborne viruses.
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Affiliation(s)
- Luca Valentini
- Dipartimento di Ingegneria Civile e Ambientale, Università degli Studi di Perugia, Strada di Pentima 4, 05100 Terni, Italy;
| | - Silvia Bittolo Bon
- Dipartimento di Ingegneria Civile e Ambientale, Università degli Studi di Perugia, Strada di Pentima 4, 05100 Terni, Italy;
| | - Giacomo Giorgi
- Dipartimento di Ingegneria Civile e Ambientale, Università degli Studi di Perugia, Via G. Duranti 93, 06125, Perugia, & CNR-SCITEC, I-06123 Perugia, Italy
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25
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Wang Y, Zhou Y, Ren H, Wang Y, Zhu X, Guo Y, Li X. Room-Temperature and Humidity-Resistant Trace Nitrogen Dioxide Sensing of Few-Layer Black Phosphorus Nanosheet by Incorporating Zinc Oxide Nanowire. Anal Chem 2020; 92:11007-11017. [DOI: 10.1021/acs.analchem.9b05623] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Yanjie Wang
- Key Laboratory of Optoelectronic Technology and System of Ministry of Education, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, PR China
| | - Yong Zhou
- Key Laboratory of Optoelectronic Technology and System of Ministry of Education, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, PR China
| | - Hao Ren
- Key Laboratory of Optoelectronic Technology and System of Ministry of Education, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, PR China
| | - Yuhang Wang
- Key Laboratory of Optoelectronic Technology and System of Ministry of Education, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, PR China
| | - Xiangyi Zhu
- Key Laboratory of Optoelectronic Technology and System of Ministry of Education, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, PR China
| | - Yongcai Guo
- Key Laboratory of Optoelectronic Technology and System of Ministry of Education, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, PR China
| | - Xian Li
- Key Laboratory of Agricultural Information Service Technology of Ministry of Agriculture, Agricultural Information Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
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26
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Rondiya SR, Karbhal I, Jadhav CD, Nasane MP, Davies TE, Shelke MV, Jadkar SR, Chavan PG, Dzade NY. Uncovering the origin of enhanced field emission properties of rGO-MnO 2 heterostructures: a synergistic experimental and computational investigation. RSC Adv 2020; 10:25988-25998. [PMID: 35518634 PMCID: PMC9055343 DOI: 10.1039/d0ra03360j] [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: 04/15/2020] [Accepted: 06/15/2020] [Indexed: 11/21/2022] Open
Abstract
The unique structural merits of heterostructured nanomaterials including the electronic interaction, interfacial bonding and synergistic effects make them attractive for fabricating highly efficient optoelectronic devices. Herein, we report the synthesis of MnO2 nanorods and a rGO/MnO2 nano-heterostructure using low-cost hydrothermal and modified Hummers' methods, respectively. Detailed characterization and confirmation of the structural and morphological properties are done via X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM) and Transmission Electron Microscopy (TEM). Compared to the isolated MnO2 nanorods, the rGO/MnO2 nano-heterostructure exhibits impressive field emission (FE) performance in terms of the low turn-on field of 1.4 V μm−1 for an emission current density of 10 μA cm−2 and a high current density of 600 μA cm−2 at a relatively very low applied electric field of 3.1 V μm−1. The isolated MnO2 nanorods display a high turn-on field of 7.1 for an emission current density of 10 μA cm−2 and a low current density of 221 μA cm−2 at an applied field of 8.1 V μm−1. Besides the superior FE characteristics of the rGO/MnO2 nano-heterostructure, the emission current remains quite stable over the continuous 2 h period of measurement. The improvement of the FE characteristics of the rGO/MnO2 nano-heterostructure can be ascribed to the nanometric features and the lower work function (6.01 and 6.12 eV for the rGO with 8% and 16% oxygen content) compared to the isolated α-MnO2(100) surface (Φ = 7.22 eV) as predicted from complementary first-principles electronic structure calculations based on density functional theory (DFT) methods. These results suggest that an appropriate coupling of rGO with MnO2 nanorods would have a synergistic effect of lowering the electronic work function, resulting in a beneficial tuning of the FE characteristics. The unique structural merits of heterostructured nanomaterials including the electronic interaction, interfacial bonding and synergistic effects make them attractive for fabricating highly efficient optoelectronic devices.![]()
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Affiliation(s)
- Sachin R Rondiya
- School of Chemistry, Cardiff University Main Building, Park Place Cardiff CF10 3AT Wales UK
| | - Indrapal Karbhal
- Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory Pune 411008 MH India
| | - Chandradip D Jadhav
- The State Key Laboratory of Refractories and Metallurgy, Institute of Advanced Materials and Nanotechnology, College of Materials and Metallurgy, Wuhan University of Science and Technology Wuhan 430081 P. R. China
| | - Mamta P Nasane
- Department of Physics, Savitribai Phule Pune University Pune 411007 India
| | - Thomas E Davies
- School of Chemistry, Cardiff University Main Building, Park Place Cardiff CF10 3AT Wales UK
| | - Manjusha V Shelke
- Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory Pune 411008 MH India
| | - Sandesh R Jadkar
- Department of Physics, Savitribai Phule Pune University Pune 411007 India
| | - Padmakar G Chavan
- Department of Physics, School of Physical Sciences, Kavayitri Bahinabai Chaudhari North Maharashtra University Jalgaon 425001 India
| | - Nelson Y Dzade
- School of Chemistry, Cardiff University Main Building, Park Place Cardiff CF10 3AT Wales UK
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27
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A mechanistic approach for the modulation of band gap of nanopolyaniline using various heterogeneous carbon nanostructures. Polym Bull (Berl) 2020. [DOI: 10.1007/s00289-019-02927-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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28
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Dey A, Ghosh P, Bowen J, Braithwaite NSJ, Krishnamurthy S. Engineering work function of graphene oxide from p to n type using a low power atmospheric pressure plasma jet. Phys Chem Chem Phys 2020; 22:7685-7698. [PMID: 32031552 DOI: 10.1039/c9cp06174f] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work, we demonstrate doping graphene oxide (GO) films using a low power atmospheric pressure plasma jet (APPJ) with subsequent tuning of the work function. The surface potential of the plasma functionalized GO films could be tuned by 120 ± 10 mV by varying plasma parameters. X-ray spectroscopy used to probe these changes in electronic structure of systematically functionalized GO films by plasma. Detailed investigation using X-ray photoelectron spectroscopy and near edge X-ray absorption fine structure spectroscopy revealed the reactive nitrogen species in the plasma induce finite changes in the surface chemistry of the GO films, introducing additional density of states near the top of the valence band edge. Nitrogen introduced by the atmospheric pressure plasma is predominantly in a graphitic configuration with a varying concentration of pyridinic nitrogen. Additionally, evidence of gradual de-epoxidation of these GO films with increasing plasma exposure was also observed. We attribute this variation in work function values to the configuration of nitrogen in the graphitic structure as revealed by X-ray spectroscopy. With pyridinic nitrogen the electronic states of GO became electron deficient, inducing a p-type doping whereas an increase in graphitic nitrogen increased the electron density of GO leading to an n-type doping effect. Nitrogen doping was also found to decrease the resistivity from 138 MΩ sq-1 to 4 MΩ sq-1. These findings are extremely useful in fabricating heterojunction devices like sensors and optoelectronic devices where band structure alignment is key to device performance when GO is used as a charge transport layer. This technique can be extended to other known 2D systems.
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Affiliation(s)
- Avishek Dey
- School of Engineering and Innovation, The Open University, Milton Keynes, MK7 6AA, UK.
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29
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Lei X, Ma H, Fang H. Length feature of ssDNA adsorption onto graphene oxide with both large unoxidized and oxidized regions. NANOSCALE 2020; 12:6699-6707. [PMID: 32186546 DOI: 10.1039/c9nr10170e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
DNA/GO functional structures have been widely used in biosensors, biomedicine and materials science. However, most studies about DNA/GO functional structures do not take into account the coexistence of both large unoxidized and oxidized regions on GO sheets. This special local structure provides the boundary region, which is the junction area between unoxidized and oxidized regions, and exhibits a special amphiphilic property of the GO sheets. Here based on molecular dynamics simulations, our results predict that the adsorption efficiency of long strand ssDNA molecules adsorbed on GO is 43%. Further analysis has shown that the ssDNA adsorption behaviors on the GO surface are more likely to start in the boundary region, even for 20 mer ssDNA molecules. Looking into the adsorption dynamic process we can see that the hydrogen bonds between ssDNA and GO are very active and easily broken and formed, especially for the boundary region of the GO surface, resulting in easy capture and adsorption of the ssDNA molecules on this region. The result provides insightful understanding of the adsorption behavior of ssDNA molecules on this amphiphilic GO surface and is helpful in the design of DNA/GO functional structure-based biosensors.
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Affiliation(s)
- Xiaoling Lei
- Department of Physics, East China University of Science and Technology, Shanghai 200237, China.
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30
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Zheng B, Xie Y, Deng Y, Wang Z, Lou Y, Qian Y, He J, Yu H. Highly Effective Work Function Reduction of α‐Borophene via Caesium Decoration: A First‐Principles Investigation. ADVANCED THEORY AND SIMULATIONS 2020. [DOI: 10.1002/adts.201900249] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Bing Zheng
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science Heilongjiang University Harbin 150080 P. R. China
| | - Ying Xie
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science Heilongjiang University Harbin 150080 P. R. China
| | - Ying‐yi Deng
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science Heilongjiang University Harbin 150080 P. R. China
| | - Zhao‐qi Wang
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science Heilongjiang University Harbin 150080 P. R. China
- College of Physics Sichuan University Chengdu 610065 P. R. China
| | - Yuan‐qing Lou
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science Heilongjiang University Harbin 150080 P. R. China
| | - Yin‐yin Qian
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science Heilongjiang University Harbin 150080 P. R. China
| | - Jing He
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science Heilongjiang University Harbin 150080 P. R. China
| | - Hai‐tao Yu
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) and School of Chemistry and Materials Science Heilongjiang University Harbin 150080 P. R. China
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31
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Peng R, Li Y, Liu T, Sun Q, Si P, Zhang L, Ci L. Reduced graphene oxide/SnO2@Au heterostructure for enhanced ammonia gas sensing. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.136829] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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32
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Casanova-Cháfer J, García-Aboal R, Atienzar P, Llobet E. Gas Sensing Properties of Perovskite Decorated Graphene at Room Temperature. SENSORS (BASEL, SWITZERLAND) 2019; 19:E4563. [PMID: 31635202 PMCID: PMC6832145 DOI: 10.3390/s19204563] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 10/17/2019] [Accepted: 10/18/2019] [Indexed: 12/14/2022]
Abstract
This paper explores the gas sensing properties of graphene nanolayers decorated with lead halide perovskite (CH3NH3PbBr3) nanocrystals to detect toxic gases such as ammonia (NH3) and nitrogen dioxide (NO2). A chemical-sensitive semiconductor film based on graphene has been achieved, being decorated with CH3NH3PbBr3 perovskite (MAPbBr3) nanocrystals (NCs) synthesized, and characterized by several techniques, such as field emission scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. Reversible responses were obtained towards NO2 and NH3 at room temperature, demonstrating an enhanced sensitivity when the graphene is decorated by MAPbBr3 NCs. Furthermore, the effect of ambient moisture was extensively studied, showing that the use of perovskite NCs in gas sensors can become a promising alternative to other gas sensitive materials, due to the protective character of graphene, resulting from its high hydrophobicity. Besides, a gas sensing mechanism is proposed to understand the effects of MAPbBr3 sensing properties.
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Affiliation(s)
| | - Rocío García-Aboal
- Instituto de Tecnología Química, CSIC-UPV, Universitat Politècnica de València, 46022 Valencia, Spain.
| | - Pedro Atienzar
- Instituto de Tecnología Química, CSIC-UPV, Universitat Politècnica de València, 46022 Valencia, Spain.
| | - Eduard Llobet
- MINOS-EMaS, Universitat Rovira i Virgili, 43007 Tarragona, Spain.
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33
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Akada K, Obata S, Saiki K. Work Function Lowering of Graphite by Sequential Surface Modifications: Nitrogen and Hydrogen Plasma Treatment. ACS OMEGA 2019; 4:16531-16535. [PMID: 31616832 PMCID: PMC6788051 DOI: 10.1021/acsomega.9b02208] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Accepted: 08/30/2019] [Indexed: 06/10/2023]
Abstract
Graphite-related materials play an important role in various kinds of devices and catalysts. Controlling the properties of such materials is of great significance to widen the potential applications and improve the performance of such applications as field emission devices and catalyst for fuel cells. In particular, the work function strongly affects the performance, and thus development of methods to tune the work function widely is urgently required. Here, we achieved wide-range control of the work function of graphite by nitrogen and hydrogen plasma treatments. The time of hydrogen plasma treatment and the amount of nitrogen atoms doped beforehand could control the work function of graphite from 2.9 to 5.0 eV. The formation of a surface dipole layer and the nitrogen-derived electron donation contributed to such lowering of the work function, which is advantageous for applications in various fields.
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34
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Gerber IC, Serp P. A Theory/Experience Description of Support Effects in Carbon-Supported Catalysts. Chem Rev 2019; 120:1250-1349. [DOI: 10.1021/acs.chemrev.9b00209] [Citation(s) in RCA: 274] [Impact Index Per Article: 54.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Iann C. Gerber
- LPCNO, Université de Toulouse, CNRS, INSA, UPS, 135 avenue de Rangueil, F-31077 Toulouse, France
| | - Philippe Serp
- LCC-CNRS, Université de Toulouse, UPR 8241 CNRS, INPT, 31400 Toulouse, France
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35
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Gillespie PNO, Martsinovich N. Origin of Charge Trapping in TiO 2/Reduced Graphene Oxide Photocatalytic Composites: Insights from Theory. ACS APPLIED MATERIALS & INTERFACES 2019; 11:31909-31922. [PMID: 31385493 PMCID: PMC7007046 DOI: 10.1021/acsami.9b09235] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Accepted: 08/06/2019] [Indexed: 05/26/2023]
Abstract
Composites of titanium dioxide (TiO2) and reduced graphene oxide (RGO) have proven to be much more effective photocatalysts than TiO2 alone. However, little attention has been paid so far to the chemical structure of TiO2/RGO interfaces and to the role that the unavoidable residual oxygen functional groups of RGO play in the photocatalytic mechanism. In this work, we develop models of TiO2 rutile (110)/RGO interfaces by including a variety of oxygen functional groups known to be present in RGO. Using hybrid density functional theory calculations, we demonstrate that the presence of oxygen functional groups and the formation of interfacial cross-links (Ti-O-C covalent bonds and strong hydrogen bonds between TiO2 and RGO) have a major effect on the electronic properties of RGO and RGO-based composites. The electronic structure changes from semimetallic to semiconducting with an indirect band gap, with the lowest unoccupied band positioned below the TiO2 conduction band and largely localized on RGO oxygen and carbon orbitals, with some contributions of RGO-bonded Ti atoms. We suggest that this RGO-based lowest unoccupied band acts as a photoelectron trap and the indirect nature of the band gap hinders electron-hole recombination. These results can explain the experimentally observed extended lifetimes of photoexcited charge carriers in TiO2/RGO composites and the enhancement of photocatalytic efficiency of these composites.
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Diamantopoulou A, Sakellis E, Gardelis S, Tsoutsou D, Glenis S, Boukos N, Dimoulas A, Likodimos V. Advanced Photocatalysts Based on Reduced Nanographene Oxide-TiO 2 Photonic Crystal Films. MATERIALS 2019; 12:ma12162518. [PMID: 31394874 PMCID: PMC6720929 DOI: 10.3390/ma12162518] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2019] [Revised: 07/31/2019] [Accepted: 08/05/2019] [Indexed: 02/05/2023]
Abstract
Surface functionalization of TiO2 inverse opals by graphene oxide nanocolloids (nanoGO) presents a promising modification for the development of advanced photocatalysts that combine slow photon-assisted light harvesting, surface area, and mass transport of macroporous photonic structures with the enhanced adsorption capability, surface reactivity, and charge separation of GO nanosheets. In this work, post-thermal reduction of nanoGO–TiO2 inverse opals was investigated in order to explore the role of interfacial electron transfer vs. pollutant adsorption and improve their photocatalytic activity. Photonic band gap-engineered TiO2 inverse opals were fabricated by the coassembly technique and were functionalized by GO nanosheets and reduced under He at 200 and 500 °C. Comparative performance evaluation of the nanoGO–TiO2 films on methylene blue photodegradation under UV-VIS and visible light showed that thermal reduction at 200 °C, in synergy with slow photon effects, improved the photocatalytic reaction rate despite the loss of nanoGO and oxygen functional groups, pointing to enhanced charge separation. This was further supported by photoluminescence spectroscopy and salicylic acid UV-VIS photodegradation, where, in the absence of photonic effects, the photocatalytic activity increased, confirming that fine-tuning of interfacial coupling between TiO2 and reduced nanoGO is a key factor for the development of highly efficient photocatalytic films.
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Affiliation(s)
- Angeliki Diamantopoulou
- Section of Solid State Physics, Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis, 15784 Ilissia, Greece
| | - Elias Sakellis
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", 15310 Agia Paraskevi, Greece
| | - Spiros Gardelis
- Section of Solid State Physics, Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis, 15784 Ilissia, Greece
| | - Dimitra Tsoutsou
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", 15310 Agia Paraskevi, Greece
| | - Spyridon Glenis
- Section of Solid State Physics, Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis, 15784 Ilissia, Greece
| | - Nikolaos Boukos
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", 15310 Agia Paraskevi, Greece
| | - Athanasios Dimoulas
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", 15310 Agia Paraskevi, Greece
| | - Vlassis Likodimos
- Section of Solid State Physics, Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis, 15784 Ilissia, Greece.
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Meng A, Zhang L, Cheng B, Yu J. Dual Cocatalysts in TiO 2 Photocatalysis. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1807660. [PMID: 31148244 DOI: 10.1002/adma.201807660] [Citation(s) in RCA: 277] [Impact Index Per Article: 55.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Revised: 03/17/2019] [Indexed: 05/22/2023]
Abstract
Semiconductor photocatalysis is recognized as a promising strategy to simultaneously address energy needs and environmental pollution. Titanium dioxide (TiO2 ) has been investigated for such applications due to its low cost, nontoxicity, and high chemical stability. However, pristine TiO2 still suffers from low utilization of visible light and high photogenerated-charge-carrier recombination rate. Recently, TiO2 photocatalysts modified by dual cocatalysts with different functions have attracted much attention due to the extended light absorption, enhanced reactant adsorption, and promoted charge-carrier-separation efficiency granted by various cocatalysts. Recent progress on the component and structural design of dual cocatalysts in TiO2 photocatalysts is summarized. Depending on their components, dual cocatalysts decorated on TiO2 photocatalysts can be divided into the following categories: bimetallic cocatalysts, metal-metal oxide/sulfide cocatalysts, metal-graphene cocatalysts, and metal oxide/sulfide-graphene cocatalysts. Depending on their architecture, they can be categorized into randomly deposited binary cocatalysts, facet-dependent selective-deposition binary cocatalysts, and core-shell structural binary cocatalysts. Concluding perspectives on the challenges and opportunities for the further exploration of dual cocatalyst-modified TiO2 photocatalysts are presented.
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Affiliation(s)
- Aiyun Meng
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Liuyang Zhang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Bei Cheng
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Jiaguo Yu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China
- Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia
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38
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Thangamuthu M, Hsieh KY, Kumar PV, Chen GY. Graphene- and Graphene Oxide-Based Nanocomposite Platforms for Electrochemical Biosensing Applications. Int J Mol Sci 2019; 20:E2975. [PMID: 31216691 PMCID: PMC6628170 DOI: 10.3390/ijms20122975] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 06/01/2019] [Accepted: 06/04/2019] [Indexed: 12/14/2022] Open
Abstract
Graphene and its derivatives such as graphene oxide (GO) and reduced GO (rGO) offer excellent electrical, mechanical and electrochemical properties. Further, due to the presence of high surface area, and a rich oxygen and defect framework, they are able to form nanocomposites with metal/semiconductor nanoparticles, metal oxides, quantum dots and polymers. Such nanocomposites are becoming increasingly useful as electrochemical biosensing platforms. In this review, we present a brief introduction on the aforementioned graphene derivatives, and discuss their synthetic strategies and structure-property relationships important for biosensing. We then highlight different nanocomposite platforms that have been developed for electrochemical biosensing, introducing enzymatic biosensors, followed by non-enzymatic biosensors and immunosensors. Additionally, we briefly discuss their role in the emerging field of biomedical cell capture. Finally, a brief outlook on these topics is presented.
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Affiliation(s)
- Madasamy Thangamuthu
- Nanophotonics and Metrology Laboratory (NAM), Swiss Federal Institute of Technology Lausanne (EPFL), 1015 Lausanne, Switzerland.
| | - Kuan Yu Hsieh
- Institute of Biomedical Engineering, College of Electrical and Computer Engineering, National Chiao Tung University, Hsinchu 300, Taiwan.
- Department of Electrical and Computer Engineering, College of Electrical and Computer Engineering, National Chiao Tung University, Hsinchu 300, Taiwan.
| | - Priyank V Kumar
- School of Chemical Engineering, University of New South Wales, Sydney, NSW 2052, Australia.
| | - Guan-Yu Chen
- Institute of Biomedical Engineering, College of Electrical and Computer Engineering, National Chiao Tung University, Hsinchu 300, Taiwan.
- Department of Biological Science and Technology, College of Biological Science and Technology, National Chiao Tung University, Hsinchu 300, Taiwan.
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39
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The enhanced NO2 sensing properties of SnO2 nanoparticles/reduced graphene oxide composite. J Colloid Interface Sci 2019; 537:228-237. [DOI: 10.1016/j.jcis.2018.11.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Revised: 10/21/2018] [Accepted: 11/04/2018] [Indexed: 11/22/2022]
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Bellani S, Antognazza MR, Bonaccorso F. Carbon-Based Photocathode Materials for Solar Hydrogen Production. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1801446. [PMID: 30221413 DOI: 10.1002/adma.201801446] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Revised: 06/15/2018] [Indexed: 06/08/2023]
Abstract
Hydrogen is considered a promising environmentally friendly energy carrier for replacing traditional fossil fuels. In this context, photoelectrochemical cells effectively convert solar energy directly to H2 fuel by water photoelectrolysis, thereby monolitically combining the functions of both light harvesting and electrolysis. In such devices, photocathodes and photoanodes carry out the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER), respectively. Here, the focus is on photocathodes for HER, traditionally based on metal oxides, III-V group and II-VI group semiconductors, silicon, and copper-based chalcogenides as photoactive material. Recently, carbon-based materials have emerged as reliable alternatives to the aforementioned materials. A perspective on carbon-based photocathodes is provided here, critically analyzing recent research progress and outlining the major guidelines for the development of efficient and stable photocathode architectures. In particular, the functional role of charge-selective and protective layers, which enhance both the efficiency and the durability of the photocathodes, is discussed. An in-depth evaluation of the state-of-the-art fabrication of photocathodes through scalable, high-troughput, cost-effective methods is presented. The major aspects on the development of light-trapping nanostructured architectures are also addressed. Finally, the key challenges on future research directions in terms of potential performance and manufacturability of photocathodes are analyzed.
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Affiliation(s)
- Sebastiano Bellani
- Graphene Labs, Istituto Italiano di Tecnologia, via Morego 30, 16163, Genova, Italy
| | - Maria Rosa Antognazza
- Center for Nano Science and Technology @Polimi, Istituto Italiano di Tecnologia, via Pascoli 70/3, 20133, Milan, Italy
| | - Francesco Bonaccorso
- Graphene Labs, Istituto Italiano di Tecnologia, via Morego 30, 16163, Genova, Italy
- BeDimensional Srl, via Albisola 121, 16163, Genova, Italy
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41
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Z-Schemed WO3/rGO/SnIn4S8 Sandwich Nanohybrids for Efficient Visible Light Photocatalytic Water Purification. Catalysts 2019. [DOI: 10.3390/catal9020187] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Semiconductor photocatalysis has received much attention as a promising technique to solve energy crisis and environmental pollution. This work demonstrated the rational design of “sandwich” WO3/rGO/SnIn4S8 (WGS) Z-scheme photocatalysts for efficient purification of wastewater emitted from tannery and dyeing industries. Such materials were prepared by a combined protocol of the in situ precipitation method with hydrothermal synthesis, and structurally characterized by XRD, SEM, HRTEM, UV-vis DRS, and PL spectroscopy. Results showed that the Z-schemed nanohybrids significantly enhanced the photocatalytic activity compared to the single component photocatalysts. An optimized case of the WGS-2.5% photocatalysts exhibited the highest Cr(VI) reduction rate, which was ca. 1.8 and 12 times more than those of pure SnIn4S8 (SIS) and WO3, respectively. Moreover, the molecular mechanism of the enhanced photocatalysis was clearly revealed by the radical-trapping control experiments and electron paramagnetic resonance (ESR) spectroscopy. The amount of superoxide and hydroxyl radicals as the major reactive oxygen species performing the redox catalysis was enhanced significantly on the Z-scheme WGS photocatalysts, where the spatial separation of photoinduced electron–hole pairs was therefore accelerated for the reduction of Cr(VI) and degradation of Rhodamine B (RhB). This study provides a novel strategy for the synthesis of all-solid-state Z-scheme photocatalysts for environmental remediation.
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42
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Liu R, Qiu R, Zou T, Liu C, Chen J, Dai Q, Zhang S, Zhou H. SnO 2-rGO nanocomposite as an efficient electron transport layer for stable perovskite solar cells on AZO substrate. NANOTECHNOLOGY 2019; 30:075202. [PMID: 30524051 DOI: 10.1088/1361-6528/aaf2ad] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Electron transport layer (ETL) plays an important role in realizing efficient and stable perovskite solar cells (PSCs). There are continuous efforts in developing new types of low cost ETLs with improved conductivity and compatibility with perovskite and the conducting electrode. Here, in order to obtain high efficient and stable PSCs on ZnO:Al (AZO) substrate, reduced graphene oxide (rGO) is incorporated into SnO2 nanoparticles to form composite ETL. For planar PSC on AZO substrates, SnO2-rGO with a low incorporation ratio of 3 wt% rGO significantly enhances the device short circuit current density (J sc) and the fill factor when compared to the device with pristine SnO2 ETL, leading to an overall power conversion efficiency of 16.8% with negligible hysteresis. The effectiveness of the excited charge transfer process of SnO2-rGO ETL is revealed by time-resolved photoluminescence decay, and by electrochemical impedance spectrum measurements. Furthermore, the solar cell stability is also enhanced due to the incorporation of rGO in the ETL. This work provides a low cost and effective ETL modification strategy for achieving high performance planar PSCs.
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Affiliation(s)
- Rong Liu
- School of Electronic and Computer Engineering, Shenzhen Graduate School, Peking University, Shenzhen, 518055, People's Republic of China
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43
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Reduced Graphene Oxide/CZTSxSe1‐xComposites as a Novel Hole‐Transport Functional Layer in Perovskite Solar Cells. ChemElectroChem 2019. [DOI: 10.1002/celc.201801459] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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44
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Synthesis and Characterization of Reduced Graphene Oxide and Their Application in Dye-Sensitized Solar Cells. CHEMENGINEERING 2019. [DOI: 10.3390/chemengineering3010007] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Reduced graphene oxide has certain unique qualities that make them versatile for a myriad of applications. Unlike graphene oxide, reduced graphene oxide is a conductive material and well suited for use in electrically conductive materials, such as solar cell devices. In this study, we report on the synthesis of graphene oxide as well as the fabrication and characterization of dye-sensitized solar cells with a photoanode which is an amalgam of reduced graphene oxide and titanium dioxide. The synthesized reduced graphene oxide and the corresponding photoanode were fully characterized using Ultraviolet-visible, Fourier transform infrared (FTIR), and Raman Spectrometry. The morphology of the sample was assessed using Atomic Force Microscopy, Field Emission Scanning Electron Microscopy, Transmission Electron Microscopy, and Energy Dispersive X-ray Spectroscopy. The photovoltaic characteristics were determined by photocurrent and photo-voltage measurements of the fabricated solar cells. The electrical impedances of both sets of devices were also evaluated. Overall, the solar to electric power efficiency of the device with reduced graphene oxide was observed to be higher (2.02%) than the device without the reduced graphene oxide (1.61%).
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45
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Das S, Pandey D, Thomas J, Roy T. The Role of Graphene and Other 2D Materials in Solar Photovoltaics. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1802722. [PMID: 30187972 DOI: 10.1002/adma.201802722] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2018] [Revised: 06/08/2018] [Indexed: 05/24/2023]
Abstract
2D materials have attracted considerable attention due to their exciting optical and electronic properties, and demonstrate immense potential for next-generation solar cells and other optoelectronic devices. With the scaling trends in photovoltaics moving toward thinner active materials, the atomically thin bodies and high flexibility of 2D materials make them the obvious choice for integration with future-generation photovoltaic technology. Not only can graphene, with its high transparency and conductivity, be used as the electrodes in solar cells, but also its ambipolar electrical transport enables it to serve as both the anode and the cathode. 2D materials beyond graphene, such as transition-metal dichalcogenides, are direct-bandgap semiconductors at the monolayer level, and they can be used as the active layer in ultrathin flexible solar cells. However, since no 2D material has been featured in the roadmap of standard photovoltaic technologies, a proper synergy is still lacking between the recently growing 2D community and the conventional solar community. A comprehensive review on the current state-of-the-art of 2D-materials-based solar photovoltaics is presented here so that the recent advances of 2D materials for solar cells can be employed for formulating the future roadmap of various photovoltaic technologies.
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Affiliation(s)
- Sonali Das
- NanoScience Technology Center, University of Central Florida, Orlando, FL, 32826, USA
| | - Deepak Pandey
- NanoScience Technology Center, University of Central Florida, Orlando, FL, 32826, USA
- Department of Materials Science and Engineering, University of Central Florida, Orlando, FL, 32816, USA
| | - Jayan Thomas
- NanoScience Technology Center, University of Central Florida, Orlando, FL, 32826, USA
- Department of Materials Science and Engineering, University of Central Florida, Orlando, FL, 32816, USA
- College of Optics and Photonics, University of Central Florida, Orlando, FL, 32816, USA
| | - Tania Roy
- NanoScience Technology Center, University of Central Florida, Orlando, FL, 32826, USA
- Department of Materials Science and Engineering, University of Central Florida, Orlando, FL, 32816, USA
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46
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Asha S, Ananth AN, Jose SP, Rajan MAJ. Flexible and free-standing reduced graphene oxide thick films with PMMA stabilized silver nanoparticles, as a potential probe for cancer thermal therapy. Biomed Phys Eng Express 2018. [DOI: 10.1088/2057-1976/aae90c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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47
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Investigation of different effects on the capacity of supercapacitor comprising an ionic liquid between graphene oxide nanosheets. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.06.123] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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48
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Maity N, Ghosh R, Nandi AK. Optoelectronic Properties of Self-Assembled Nanostructures of Polymer Functionalized Polythiophene and Graphene. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:7585-7597. [PMID: 29390187 DOI: 10.1021/acs.langmuir.7b04387] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
In this Feature Article, we discuss the variation of optoelectronic properties with the aggregation style of polythiophene (PT) graft copolymers and polymer-modified graphene systems. Grafting of flexible polymers on a PT chain exhibits several self-organized patterns under various conditions, causing different optical and electronic properties, arising from the different conformational states of the conjugated chain. Graphene, a zero band gap material, is functionalized with polymers both covalently and noncovalently to create a finite band gap importing new optoelectronic properties. The polymer-triggered self-assembled nanostructures of PT and graphene-based materials bring unique optical/electronic properties suitable for sensing toxic ions, nitroaromatics, and surfactants, for drug delivery, and also for fabricating molecular logic gates, electronic rectifiers, photocurrent devices, etc.
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Affiliation(s)
- Nabasmita Maity
- Polymer Science Unit , Indian Association for the Cultivation of Science , Jadavpur, Kolkata - 700 032 , India
| | - Radhakanta Ghosh
- Polymer Science Unit , Indian Association for the Cultivation of Science , Jadavpur, Kolkata - 700 032 , India
| | - Arun K Nandi
- Polymer Science Unit , Indian Association for the Cultivation of Science , Jadavpur, Kolkata - 700 032 , India
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49
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Structural Evolution of Hydrothermally Derived Reduced Graphene Oxide. Sci Rep 2018; 8:6849. [PMID: 29717170 PMCID: PMC5931577 DOI: 10.1038/s41598-018-25194-1] [Citation(s) in RCA: 120] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Accepted: 04/12/2018] [Indexed: 11/24/2022] Open
Abstract
Hydrothermal reduction is a promising approach for graphene oxide (GO) reduction since it is environmentally friendly, simple, and cost effective. We present a detailed study of structural changes occurring in graphene oxide during the reduction process. The correlations between the interlayer spacing, chemical states, work functions, surface morphology, level of disorders, the number of layers, and processing time are elucidated. The results reveal that GO flakes remain in the early stage of the reduction process and that they are fully reduced after a 4-h hydrothermal treatment. With an increase in the reduction time, the resulting product, i.e., reduced graphene oxide, has a low oxygen content, small interlayer spacing, and crumbled and wrinkled structures. We are convinced that these properties can be tuned to a desired level for various applications.
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50
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Song Y, Johnson D, Peng R, Hensley DK, Bonnesen PV, Liang L, Huang J, Yang F, Zhang F, Qiao R, Baddorf AP, Tschaplinski TJ, Engle NL, Hatzell MC, Wu Z, Cullen DA, Meyer HM, Sumpter BG, Rondinone AJ. A physical catalyst for the electrolysis of nitrogen to ammonia. SCIENCE ADVANCES 2018; 4:e1700336. [PMID: 29719860 PMCID: PMC5922794 DOI: 10.1126/sciadv.1700336] [Citation(s) in RCA: 128] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Accepted: 03/12/2018] [Indexed: 05/10/2023]
Abstract
Ammonia synthesis consumes 3 to 5% of the world's natural gas, making it a significant contributor to greenhouse gas emissions. Strategies for synthesizing ammonia that are not dependent on the energy-intensive and methane-based Haber-Bosch process are critically important for reducing global energy consumption and minimizing climate change. Motivated by a need to investigate novel nitrogen fixation mechanisms, we herein describe a highly textured physical catalyst, composed of N-doped carbon nanospikes, that electrochemically reduces dissolved N2 gas to ammonia in an aqueous electrolyte under ambient conditions. The Faradaic efficiency (FE) achieves 11.56 ± 0.85% at -1.19 V versus the reversible hydrogen electrode, and the maximum production rate is 97.18 ± 7.13 μg hour-1 cm-2. The catalyst contains no noble or rare metals but rather has a surface composed of sharp spikes, which concentrates the electric field at the tips, thereby promoting the electroreduction of dissolved N2 molecules near the electrode. The choice of electrolyte is also critically important because the reaction rate is dependent on the counterion type, suggesting a role in enhancing the electric field at the sharp spikes and increasing N2 concentration within the Stern layer. The energy efficiency of the reaction is estimated to be 5.25% at the current FE of 11.56%.
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Affiliation(s)
- Yang Song
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Daniel Johnson
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Rui Peng
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Dale K. Hensley
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Peter V. Bonnesen
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Liangbo Liang
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Jingsong Huang
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
- Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Fengchang Yang
- Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA
| | - Fei Zhang
- Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA
| | - Rui Qiao
- Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA
| | - Arthur P. Baddorf
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | | | - Nancy L. Engle
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Marta C. Hatzell
- George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Zili Wu
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - David A. Cullen
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Harry M. Meyer
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Bobby G. Sumpter
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
- Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Adam J. Rondinone
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
- Corresponding author.
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