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Anisotropy of the Electric Field Gradient in Two-Dimensional α-MoO3 Investigated by 57Mn(57Fe) Emission Mössbauer Spectroscopy. CRYSTALS 2022. [DOI: 10.3390/cryst12070942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Van der Waals α-MoO3 samples offer a wide range of attractive catalytic, electronic, and optical properties. We present herein an emission Mössbauer spectroscopy (eMS) study of the electric-field gradient (EFG) anisotropy in crystalline free-standing α-MoO3 samples. Although α-MoO3 is a two-dimensional (2D) material, scanning electron microscopy shows that the crystals are 0.5–5-µm thick. The combination of X-ray diffraction and micro-Raman spectroscopy, performed after sample preparation, provided evidence of the phase purity and crystal quality of the samples. The eMS measurements were conducted following the implantation of 57Mn (t1/2 = 1.5 min), which decays to the 57Fe, 14.4 keV Mössbauer state. The eMS spectra of the samples are dominated by a paramagnetic doublet (D1) with an angular dependence, pointing to the Fe2+ probe ions being in a crystalline environment. It is attributed to an asymmetric EFG at the eMS probe site originating from strong in-plane covalent bonds and weak out-of-plane van der Waals interactions in the 2D material. Moreover, a second broad component, D2, can be assigned to Fe3+ defects that are dynamically generated during the online measurements. The results are compared to ab initio simulations and are discussed in terms of the in-plane and out-of-plane interactions in the system.
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Yan Z, Yang H, Yang Z, Ji C, Zhang G, Tu Y, Du G, Cai S, Lin S. Emerging Two-Dimensional Tellurene and Tellurides for Broadband Photodetectors. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2200016. [PMID: 35244332 DOI: 10.1002/smll.202200016] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Revised: 01/30/2022] [Indexed: 06/14/2023]
Abstract
As with all stylish 2D functional materials, tellurene and tellurides possessing excellent physical and chemical properties such as high environmental stability, tunable narrow bandgap, and lower thermal conductivity, have aroused the great interest of the researchers. These properties of such materials also form the basis for relatively newfangled scholarly fields involving advanced topics, especially for broadband photodetectors. Integrating the excellent properties of many 2D materials, tellurene/telluride-based photodetectors show great flexibility, higher frequency response or faster time response, high signal-to-noise ratio, and so on, which make them leading the frontier of photodetector research. To fully understand the excellent properties of tellurene/tellurides and their optoelectronic applications, the recent advances in tellurene/telluride-based photodetectors are maximally summarized. Benefiting from the solid research in this field, the challenges and opportunities of tellurene/tellurides for future optoelectronic applications are also discussed in this review, which might provide possibilities for the realization of state-of-the-art high-performance tellurene/telluride-based devices.
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Affiliation(s)
- Zihan Yan
- Songshan Lake Materials Laboratory, Dongguan, 523808, China
- College of Physics Science and Technology, Yangzhou University, Jiangsu, 225009, China
| | - Hao Yang
- College of Physics Science and Technology, Yangzhou University, Jiangsu, 225009, China
| | - Zhuo Yang
- College of Physics Science and Technology, Yangzhou University, Jiangsu, 225009, China
| | - Chengao Ji
- College of Physics Science and Technology, Yangzhou University, Jiangsu, 225009, China
| | - Guangyu Zhang
- Songshan Lake Materials Laboratory, Dongguan, 523808, China
| | - Yusong Tu
- College of Physics Science and Technology, Yangzhou University, Jiangsu, 225009, China
| | - Guangyu Du
- Songshan Lake Materials Laboratory, Dongguan, 523808, China
- Department of Applied Physics, The Hong Kong Polytechnic University, Hunghom, Kowloon, 999077, Hong Kong
| | - Songhua Cai
- Department of Applied Physics, The Hong Kong Polytechnic University, Hunghom, Kowloon, 999077, Hong Kong
| | - Shenghuang Lin
- Songshan Lake Materials Laboratory, Dongguan, 523808, China
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Singh K, Kumari S, Singh H, Bala N, Singh P, Kumar A, Thakur A. A review on GeTe thin film-based phase-change materials. APPLIED NANOSCIENCE 2021. [DOI: 10.1007/s13204-021-01911-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Yamamoto K, Imaoka T, Tanabe M, Kambe T. New Horizon of Nanoparticle and Cluster Catalysis with Dendrimers. Chem Rev 2019; 120:1397-1437. [DOI: 10.1021/acs.chemrev.9b00188] [Citation(s) in RCA: 103] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Kimihisa Yamamoto
- Laboratory for Chemistry and Life Science (CLS), Institute of Innovative Research (IIR), Tokyo Institute of Technology, Yokohama 226-8503, Japan
- ERATO-JST Yamamoto Atom Hybrid Project, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - Takane Imaoka
- Laboratory for Chemistry and Life Science (CLS), Institute of Innovative Research (IIR), Tokyo Institute of Technology, Yokohama 226-8503, Japan
- ERATO-JST Yamamoto Atom Hybrid Project, Tokyo Institute of Technology, Yokohama 226-8503, Japan
- PRESTO-JST, Kawaguchi 332-0012, Japan
| | - Makoto Tanabe
- Laboratory for Chemistry and Life Science (CLS), Institute of Innovative Research (IIR), Tokyo Institute of Technology, Yokohama 226-8503, Japan
- ERATO-JST Yamamoto Atom Hybrid Project, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - Tetsuya Kambe
- Laboratory for Chemistry and Life Science (CLS), Institute of Innovative Research (IIR), Tokyo Institute of Technology, Yokohama 226-8503, Japan
- ERATO-JST Yamamoto Atom Hybrid Project, Tokyo Institute of Technology, Yokohama 226-8503, Japan
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