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Liu D, Di H, Ren J, Jiang W, Li H, Zhao C, Xin D, Xing Z, Zheng X, Zhao Y. X-Site Substituted 2D Cs 2 Pb(SCN) 2 Br 2 Perovskites for X-Ray Detection. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023:e2304201. [PMID: 37658508 DOI: 10.1002/smll.202304201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 08/23/2023] [Indexed: 09/03/2023]
Abstract
2D Ruddlesden-Popper (RP) perovskites have been intensively investigated due to their superior stability and outstanding optoelectrical properties. However, investigations on 2D RP perovskites are mainly focused on A-site substituted perovskites and few reports are on X-site substituted perovskites especially in X-ray detection field. Here, X-site substituted 2D RP perovskite Cs2 Pb(SCN)2 Br2 polycrystalline wafers are prepared and systematically studied for X-ray detection. The obtained wafers show a large resistivity of 2.0 × 1010 Ω cm, a high ion activation energy of 0.75 eV, a small current drift of 2.39 × 10-6 nA cm-1 s-1 V-1 , and charge carrier mobility-lifetime product under X-ray as high as 1.29 × 10-4 cm2 V-1 . These merits enable Cs2 Pb(SCN)2 Br2 wafer detectors with a sensitivity of 216.3 µC Gyair -1 cm-2 , a limit of detection of 42.4 nGyair s-1 , and good imaging ability with high spatial resolution of 1.08 lp mm-1 . In addition, Cs2 Pb(SCN)2 Br2 wafer detectors demonstrate excellent operational stability under high working field up to 2100 V cm-1 after continuous X-ray irradiation with a total dose of 45.2 Gyair . The promising features such as short octahedral spacing and weak ion migration will open up a new perspective and opportunity for SCN-based 2D perovskites in X-ray detection.
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Affiliation(s)
- Dan Liu
- Institute of Materials, China Academy of Engineering Physics, Jiangyou, 621908, China
| | - Haipeng Di
- Institute of Materials, China Academy of Engineering Physics, Jiangyou, 621908, China
| | - Jiwei Ren
- Institute of Materials, China Academy of Engineering Physics, Jiangyou, 621908, China
| | - Wei Jiang
- Institute of Materials, China Academy of Engineering Physics, Jiangyou, 621908, China
| | - Haibin Li
- Institute of Materials, China Academy of Engineering Physics, Jiangyou, 621908, China
| | - Chen Zhao
- Institute of Materials, China Academy of Engineering Physics, Jiangyou, 621908, China
| | - Deyu Xin
- Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, 621900, China
| | - Zhenning Xing
- Institute of Materials, China Academy of Engineering Physics, Jiangyou, 621908, China
| | - Xiaojia Zheng
- Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, 621900, China
| | - Yiying Zhao
- Institute of Materials, China Academy of Engineering Physics, Jiangyou, 621908, China
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Chen Y, Ding X, Yang L, Wang Y, Gurti JI, Wang M, Li W, Wang X, Yang W. Small practical cluster models for perovskites based on the similarity criterion of central location environment and their applications. Phys Chem Chem Phys 2022; 24:14375-14389. [PMID: 35642957 DOI: 10.1039/d2cp00562j] [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
Developing universal theoretical models for perovskites (often denoted as ABX3) can contribute to the rational design of novel perovskite photovoltaic materials. However, few models can be successfully applied to study the intrinsic electronic structure due to the poor accuracy and unaffordable computational cost. Herein, we report the innovative construction of small practical cluster models through the similarity criterion of the central location environment, which retains only the central A-site as the original cation while the others are substituted by Cs to keep the clusters electrically neutral. The central cation has a chemical environment similar to that of the bulk perovskite. The binding energy between A and the BX framework, geometric structures (B-X distances and B-X-B angles), and the electronic structures (the gap and the spatial distribution of HOMO and LUMO, electron distribution) of these clusters have been investigated and compared with the corresponding properties of bulk materials. The results suggest that the cluster model with twelve B-atoms suitably describes these properties. The geometric structures and gaps are closer to the bulk situations than the quasi-one-dimensional and quasi-two-dimensional cluster models with all-primitive cations, respectively. Other organic cations, such as NH3(CH2)nCH3 (n = 1, 2, and 3 for EA, PA, and BA, respectively), and (NH2)2CH (FA) can, therefore, mimic perovskite materials. Clusters with different sizes of A indicate that PA and BA will distort the quasi-cubic structures, which is consistent with the judgment of the tolerance factor of bulk materials. The reliable cluster model provides the research foundation for some basic issues of perovskites, such as vibrational spectroscopy and hydrogen bonding strength, to gain detailed insight into the interactions between A and the BX framework.
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Affiliation(s)
- Yan Chen
- School of Mathematics and Physics, North China Electric Power University, Beinong Road 2, Huilongguan, Beijing 102206, P. R. China. .,School of New Energy, North China Electric Power University, Beinong Road 2, Huilongguan, Beijing 102206, P. R. China
| | - Xunlei Ding
- School of Mathematics and Physics, North China Electric Power University, Beinong Road 2, Huilongguan, Beijing 102206, P. R. China. .,Institute of Clusters and Low Dimensional Nanomaterials, North China Electric Power University, Beinong Road 2, Huilongguan, Beijing 102206, P. R. China
| | - Luona Yang
- School of Mathematics and Physics, North China Electric Power University, Beinong Road 2, Huilongguan, Beijing 102206, P. R. China. .,Institute of Clusters and Low Dimensional Nanomaterials, North China Electric Power University, Beinong Road 2, Huilongguan, Beijing 102206, P. R. China
| | - Yaya Wang
- School of Mathematics and Physics, North China Electric Power University, Beinong Road 2, Huilongguan, Beijing 102206, P. R. China. .,School of New Energy, North China Electric Power University, Beinong Road 2, Huilongguan, Beijing 102206, P. R. China
| | - Joseph Israel Gurti
- School of Mathematics and Physics, North China Electric Power University, Beinong Road 2, Huilongguan, Beijing 102206, P. R. China. .,Institute of Clusters and Low Dimensional Nanomaterials, North China Electric Power University, Beinong Road 2, Huilongguan, Beijing 102206, P. R. China
| | - Mengmeng Wang
- School of Mathematics and Physics, North China Electric Power University, Beinong Road 2, Huilongguan, Beijing 102206, P. R. China. .,School of New Energy, North China Electric Power University, Beinong Road 2, Huilongguan, Beijing 102206, P. R. China
| | - Wei Li
- School of Mathematics and Physics, North China Electric Power University, Beinong Road 2, Huilongguan, Beijing 102206, P. R. China. .,Institute of Clusters and Low Dimensional Nanomaterials, North China Electric Power University, Beinong Road 2, Huilongguan, Beijing 102206, P. R. China
| | - Xin Wang
- School of Mathematics and Physics, North China Electric Power University, Beinong Road 2, Huilongguan, Beijing 102206, P. R. China. .,Institute of Clusters and Low Dimensional Nanomaterials, North China Electric Power University, Beinong Road 2, Huilongguan, Beijing 102206, P. R. China
| | - Weijie Yang
- Department of Power Engineering, School of Energy, Power and Mechanical Engineering, North China Electric Power University, Baoding 071003, China.
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Cui X, Wei T, Hao M, Qi Q, Wang H, Dai Z. Highly sensitive and selective colorimetric sensor for thiocyanate based on electrochemical oxidation-assisted complexation reaction with Gold nanostars etching. JOURNAL OF HAZARDOUS MATERIALS 2020; 391:122217. [PMID: 32062538 DOI: 10.1016/j.jhazmat.2020.122217] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 01/29/2020] [Accepted: 01/31/2020] [Indexed: 05/18/2023]
Abstract
In this work, we developed an electrochemical oxidation-assisted complexation strategy for highly sensitive and selective detection of thiocyanate (SCN-). Gold nanostars (AuNSs) with uniform and sharp tips were first prepared, and we found they can be quickly etched to gold nanoparticles (AuNPs) under electrochemical oxidation with the existence of halide and halogen-like ions. Through introducing SCN--selective molecule: zinc phthalocyanine (ZnPc), the fabricated ZnPc-AuNSs/ITO electrode can rapidly and selectively response to SCN- under electrochemical oxidation, manifesting as a noticeable change in color from navy blue to red. Thus SCN- concentration can be easily reflected. The wide wavelength tuning range of AuNSs to AuNPs make the ZnPc-AuNSs/ITO sensor obtain a much wider detection range for SCN- (10 nM to 80 mM) than most other reported studies. In addition, the detection limit is as low as 3 nM. It renders the sensor to be easily used in much diluted matrixes, which can further lower the interference. We further applied the colorimetric sensor to SCN- detection in wastewater and milk, excellent performance was obtained. The proposed electrochemical oxidation-assisted complexation strategy will have good promise in developing colorimetric sensors with high selectivity and wide detection range, and will display more useful application in environmental monitoring.
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Affiliation(s)
- Xinwen Cui
- Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials and Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, People's Republic of China
| | - Tianxiang Wei
- School of Environment, Nanjing Normal University, Nanjing, 210023, People's Republic of China
| | - Mengyuan Hao
- Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials and Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, People's Republic of China
| | - Qi Qi
- School of Environment, Nanjing Normal University, Nanjing, 210023, People's Republic of China
| | - Huafeng Wang
- Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials and Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, People's Republic of China
| | - Zhihui Dai
- Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials and Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, People's Republic of China; Nanjing Normal University Center for Analysis and Testing, Nanjing, 210023, People's Republic of China.
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