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Ye M, Li Y, Tang R, Liu S, Ma S, Liu H, Tao Q, Yang B, Wang X, Yue H, Zhu P. Pressure-induced bandgap engineering and photoresponse enhancement of wurtzite CuInS 2 nanocrystals. NANOSCALE 2022; 14:2668-2675. [PMID: 35107111 DOI: 10.1039/d1nr07721j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Wurtzite CuInS2 exhibits great potential for optoelectronic applications because of its excellent optical properties and good stability. However, exploring effective strategies to simultaneously optimize its optical and photoelectrical properties remains a challenge. In this study, the bandgap of wurtzite CuInS2 nanocrystals is successfully extended and the photocurrent is enhanced synchronously using external pressure. The bandgap of wurtzite CuInS2 increases with pressure and reaches an optimal value (1.5 eV) for photovoltaic solar energy conversion at about 5.9 GPa. Surprisingly, the photocurrent simultaneously increases nearly 3-fold and reaches the maximum value at this critical pressure. Theoretical calculation indicates that the pressure-induced bandgap extention in wurtzite CuInS2 may be attributed to an increased charge density and ionic polarization between the In-S atoms. The photocurrent preserves a relatively high photoresponse even at 8.8 GPa, but almost disappears above 10.3 GPa. The structural evolution demonstrates that CuInS2 undergoes a phase transformation from the wurtzite phase (P63mc) to the rock salt phase (Fm3̄m) at about 10.3 GPa, which resulted in a direct to indirect bandgap transition and fianlly caused a dramatic reduction in photocurrent. These results not only map a new route toward further increase in the photoelectrical performance of wurtzite CuInS2, but also advance the current research of AI-BIII-CVI2 materials.
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Affiliation(s)
- Meiyan Ye
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China.
| | - Yan Li
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China.
| | - Ruilian Tang
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, 130022, China.
- Center for High Pressure Science and Technology Advanced Research, Changchun, 130012, China
| | - Siyu Liu
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China.
| | - Shuailing Ma
- DeutschesElektronen-Synchrotron DESY, Hamburg, 22607, Germany
| | - Haozhe Liu
- Center for High Pressure Science and Technology Advanced Research, Changchun, 130012, China
| | - Qiang Tao
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China.
| | - Bin Yang
- Center for High Pressure Science and Technology Advanced Research, Changchun, 130012, China
| | - Xin Wang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China.
| | - Huijuan Yue
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, China
| | - Pinwen Zhu
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China.
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Karthik R, Kumar JV, Chen SM, Kumar PS, Selvam V, Muthuraj V. A selective electrochemical sensor for caffeic acid and photocatalyst for metronidazole drug pollutant - A dual role by rod-like SrV 2O 6. Sci Rep 2017; 7:7254. [PMID: 28775311 PMCID: PMC5543073 DOI: 10.1038/s41598-017-07423-1] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Accepted: 06/26/2017] [Indexed: 11/08/2022] Open
Abstract
In the present study, well-defined one-dimensional (1D) rod-like strontium vanadate (SrV2O6) was prepared by simple hydrothermal method without using any other surfactants/templates. The successful formation of rod-like SrV2O6 was confirmed by various analytical and spectroscopic techniques. Interestingly, for the first time the dual role of as-prepared rod-like SrV2O6 were employed as an electrochemical sensor for the detection of caffeic acid (CA) as well as visible light active photocatalyst for the degradation of metronidazole (MNZ) antibiotic drug. As an electrochemical sensor, the SrV2O6 modified glassy carbon electrode (GCE) demonstrated a superior electrocatalytic activity for the detection of CA by chronoamperometry and cyclic voltammetry (CVs). In addition, the electrochemical sensor exhibited a good current response for CA with excellent selectivity, wide linear response range, lower detection limit and sensitivity of 0.01-207 µM, 4 nM and 2.064 μA μM-1cm-2, respectively. On the other hand, as-synthesized rod-like SrV2O6 showed highly efficient and versatile photocatalytic performances for the degradation of MNZ, which degrades above 98% of MNZ solution under visible light irradiation within 60 min. The obtained results evidenced that the improvement of rod-like SrV2O6 might be a resourceful electrocatalyst and photocatalyst material in the probable applications of environmental and biomedical applications.
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Affiliation(s)
- R Karthik
- Department of Chemical Engineering, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei, ROC, 106, Taiwan
| | - J Vinoth Kumar
- Department of Chemistry, VHNSN College, Virudhunagar, 626001, Tamilnadu, India
| | - Shen-Ming Chen
- Department of Chemical Engineering, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei, ROC, 106, Taiwan.
| | - P Senthil Kumar
- Department of Chemistry, VHNSN College, Virudhunagar, 626001, Tamilnadu, India
- Chemistry of Heterocycles & Natural Product Research Laboratory, Department of Chemistry, School of Advanced Sciences, VIT University, 632014, Vellore, Tamilnadu, India
| | - V Selvam
- Department of Chemistry, VHNSN College, Virudhunagar, 626001, Tamilnadu, India
| | - V Muthuraj
- Department of Chemistry, VHNSN College, Virudhunagar, 626001, Tamilnadu, India.
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Exploring the coordination change of vanadium and structure transformation of metavanadate MgV 2O 6 under high pressure. Sci Rep 2016; 6:38566. [PMID: 27924843 PMCID: PMC5141448 DOI: 10.1038/srep38566] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Accepted: 11/10/2016] [Indexed: 11/17/2022] Open
Abstract
Raman spectroscopy, synchrotron angle-dispersive X-ray diffraction (ADXRD), first-principles calculations, and electrical resistivity measurements were carried out under high pressure to investigate the structural stability and electrical transport properties of metavanadate MgV2O6. The results have revealed the coordination change of vanadium ions (from 5+1 to 6) at around 4 GPa. In addition, a pressure-induced structure transformation from the C2/m phase to the C2 phase in MgV2O6 was detected above 20 GPa, and both phases coexisted up to the highest pressure. This structural phase transition was induced by the enhanced distortions of MgO6 octahedra and VO6 octahedra under high pressure. Furthermore, the electrical resistivity decreased with pressure but exhibited different slope for these two phases, indicating that the pressure-induced structural phase transitions of MgV2O6 was also accompanied by the obvious changes in its electrical transport behavior.
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García-Casado M, Prieto J, Vico-Ruiz E, Lozano-Diz E, Goberna-Selma C, Bañares MA. High-throughput operando Raman-quadrupole mass spectrometer (QMS) system to screen catalytic systems. APPLIED SPECTROSCOPY 2014; 68:69-78. [PMID: 24405956 DOI: 10.1366/13-07212] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
This paper describes the design and setup of a high-throughput Raman system for an array of eight parallel catalytic reactors during reaction conditions. The "operando" methodology combines in situ spectroscopy during catalytic reaction with a simultaneous activity measurement. The high-throughput operando Raman system, multi-operando, is a device that automates this operando methodology for several catalyst samples at the same time, all samples being in the same reaction conditions. We describe how the system is made, how Raman system positions and acquires spectra, and how each reactor outlet gas is selected and analyzed.
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Affiliation(s)
- Manuel García-Casado
- Instituto de Catálisis y Petroleoquímica, CSIC, Marie Curie, 2; E-28049-Madrid, Spain
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