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Mehrez JAA, Chen X, Zeng M, Yang J, Hu N, Wang T, Liu R, Xu L, González-Alfaro Y, Yang Z. MoTe 2/InN van der Waals heterostructures for gas sensors: a DFT study. Phys Chem Chem Phys 2023; 25:28677-28690. [PMID: 37849357 DOI: 10.1039/d3cp02906a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2023]
Abstract
Vertical van der Waals (vdW) heterostructures have shown potential for gas sensing owing to their remarkable sensitivity. However, the optimization process for achieving the best gas sensing performance is complicated by the heterostructure's reliance on both physical and electrical characteristics. This study employs density functional theory (DFT) to analyse the structural and electronic parameters of a MoTe2/InN vdW heterostructure. The findings of this study indicate that the vdW heterostructure has a type-II band alignment with higher adsorption energy towards NH3, NO2, and SO2 than the individual monolayers. In specific, the heterostructure is well suited for NO2 detection but has limitations in reliably detecting NH3 and SO2 due to longer recovery times. We find significant hybridization between the adsorbate and interacting surfaces' orbitals and a notable presence of NO2 molecular orbitals in proximity to the Fermi level. Additionally, dielectric and work function modulations offer a viable means to develop optical-based gas sensors that can selectively detect NO2. Our research provides valuable insights into vdW heterostructure design for high-performance gas sensors.
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Affiliation(s)
- Jaafar Abdul-Aziz Mehrez
- Key Laboratory of Thin Film and Microfabrication (Ministry of Education), Department of Micro/Nano Electronics, School of Electronics Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
| | - Xiyu Chen
- Key Laboratory of Thin Film and Microfabrication (Ministry of Education), Department of Micro/Nano Electronics, School of Electronics Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
| | - Min Zeng
- Key Laboratory of Thin Film and Microfabrication (Ministry of Education), Department of Micro/Nano Electronics, School of Electronics Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
| | - Jianhua Yang
- Key Laboratory of Thin Film and Microfabrication (Ministry of Education), Department of Micro/Nano Electronics, School of Electronics Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
| | - Nantao Hu
- Key Laboratory of Thin Film and Microfabrication (Ministry of Education), Department of Micro/Nano Electronics, School of Electronics Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
| | - Tao Wang
- Key Laboratory of Thin Film and Microfabrication (Ministry of Education), Department of Micro/Nano Electronics, School of Electronics Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
| | - Ruili Liu
- Key Laboratory of Thin Film and Microfabrication (Ministry of Education), Department of Micro/Nano Electronics, School of Electronics Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
| | - Lin Xu
- Department of Ophthalmology, Shanghai General Hospital (Shanghai First People's Hospital), Shanghai Jiao Tong University School of Medicine, National Clinical Research Centre for Eye Diseases, Shanghai Key Laboratory of Ocular Fundus Diseases, Shanghai Engineering Centre for Visual Science and Photomedicine, Shanghai 200080, People's Republic of China
| | | | - Zhi Yang
- Key Laboratory of Thin Film and Microfabrication (Ministry of Education), Department of Micro/Nano Electronics, School of Electronics Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
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Liang K, Wang J, Wei X, Zhang Y, Fan J, Ni L, Yang Y, Liu J, Tian Y, Wang X, Yuan C, Duan L. Tunable electronic and optical properties of MoTe 2/InSe heterostructure via external electric field and strain engineering. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2023; 35. [PMID: 37158122 DOI: 10.1088/1361-648x/acd09b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Accepted: 04/26/2023] [Indexed: 05/10/2023]
Abstract
Based on first-principles calculation under density functional theory, the geometry, electronic and optical properties of the MoTe2/InSe heterojunction have been investigated. The results reveal that the MoTe2/InSe heterojunction has a typical type-Ⅱ band alignment and exhibits an indirect bandgap of 0.99 eV. In addition, the Z-scheme electron transport mechanism is capable of efficiently separating photogenerated carriers. The bandgap of the heterostructure changes regularly under applied electric field and exhibits a significant Giant Stark effect. Under an applied electric field of 0.5 V Å-1, the band alignment of the heterojunction shifts from type-Ⅱ to type-I. The application of strain produced comparable changes in the heterojunction. More importantly, the transition from semiconductor to metal is completed in the heterostructure under the applied electric field and strain. Furthermore, the MoTe2/InSe heterojunction retains the optical properties of two monolayers and produces greater light absorption on this basis, especially for UV light. The above results offer a theoretical basis for the application of MoTe2/InSe heterostructure in the next generation of photodetectors.
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Affiliation(s)
- Kanghao Liang
- School of Materials Science and Engineering, Chang'an University, Xi'an 710064, People's Republic of China
| | - Jing Wang
- School of Materials Science and Engineering, Chang'an University, Xi'an 710064, People's Republic of China
| | - Xing Wei
- School of Materials Science and Engineering, Chang'an University, Xi'an 710064, People's Republic of China
| | - Yan Zhang
- School of Materials Science and Engineering, Chang'an University, Xi'an 710064, People's Republic of China
| | - Jibin Fan
- School of Materials Science and Engineering, Chang'an University, Xi'an 710064, People's Republic of China
| | - Lei Ni
- School of Materials Science and Engineering, Chang'an University, Xi'an 710064, People's Republic of China
| | - Yun Yang
- School of Information Engineering, Chang'an University, Xi'an 710064, People's Republic of China
| | - Jian Liu
- School of Physics, Shandong University, Jinan 250100, People's Republic of China
| | - Ye Tian
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Xuqiang Wang
- School of Materials Science and Engineering, Chang'an University, Xi'an 710064, People's Republic of China
| | - Chongrong Yuan
- School of Materials Science and Engineering, Chang'an University, Xi'an 710064, People's Republic of China
| | - Li Duan
- School of Materials Science and Engineering, Chang'an University, Xi'an 710064, People's Republic of China
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Wang J, Zhang X, Song X, Fan Y, Zhang Z, Zhao M. Insights into Photoinduced Carrier Dynamics and Overall Water Splitting of Z-Scheme van der Waals Heterostructures with Intrinsic Electric Polarization. J Phys Chem Lett 2023; 14:798-808. [PMID: 36652698 DOI: 10.1021/acs.jpclett.2c03742] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Using first-principles calculations in combination with nonadiabatic molecular dynamics (NAMD), we propose novel heterostructures of carbon nitride (C7N6) and the Janus GaSnPS monolayer as promising direct Z-scheme photocatalysts for solar-driven overall water splitting. The out-of-plane electric field due to the electric polarization which is dependent on the stacking pattern alters the band alignment and catalytic activity of the heterostructures. The relatively strong interfacial nonadiabatic coupling and long quantum coherence time accelerate the interlayer carrier recombination, enabling a direct Z-scheme photocatalytic mechanism. More importantly, the redox ability of the remanent photogenerated carriers in the Z scheme is strong enough to trigger both the hydrogen evolution reaction (HER) and oxygen reduction reaction (OER) simultaneously without the help of sacrificial agents. Our work reveals a fundamental understanding of ultrafast charge carrier dynamics at vdW heterointerfaces as well as new design prospects for highly efficient direct Z-scheme photocatalysts.
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Affiliation(s)
- Juan Wang
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan250100, China
| | - Xuejin Zhang
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan250100, China
| | - Xiaohan Song
- Shandong Institute of Advanced Technology, Jinan250100, China
| | - Yingcai Fan
- School of Information and Electronic Engineering, Shandong Technology and Business University, Yantai264005, China
| | - Zhihua Zhang
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan250100, China
| | - Mingwen Zhao
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan250100, China
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Razeghizadeh M, Pourfath M. First principles study on structural, electronic and optical properties of HfS 2(1-x)Se 2x and ZrS 2(1-x)Se 2x ternary alloys. RSC Adv 2022; 12:14061-14068. [PMID: 35558829 PMCID: PMC9092027 DOI: 10.1039/d2ra01905a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Accepted: 05/01/2022] [Indexed: 11/29/2022] Open
Abstract
Alloying 2D transition metal dichalcogenides (TMDs) with dopants to achieve ternary alloys is as an efficient and scalable solution for tuning the electronic and optical properties of two-dimensional materials. This study provides a comprehensive study on the electronic and optical properties of ternary HfS2(1−x)Se2(x) and ZrS2(1−x)Se2(x) [0 ≤ x ≤ 1] alloys, by employing density functional theory calculations along with random phase approximation. Phonon dispersions were also obtained by using density functional perturbation theory. The results indicate that both of the studied ternary families are stable and the increase of Selenium concentration in HfS2(1−x)Se2(x) and ZrS2(1−x)Se2(x) alloys results in a linear decrease of the electronic bandgap from 2.15 (ev) to 1.40 (ev) for HfS2(1−x)Se2(x) and 1.94 (ev) to 1.23 (ev) for ZrS2(1−x)Se2(x) based on the HSE06 functional. Increasing the Se concentration in the ternary alloys results in a red shift of the optical absorption spectra such that the main absorption peaks of HfS2(1−x)Se2(x) and ZrS2(1−x)Se2(x) cover a broad visible range from 3.153 to 2.607 eV and 2.405 to 1.908 eV, respectively. The studied materials appear to be excellent base materials for tunable electronic and optoelectronic devices in the visible range. Adding Selenium to HfS2 and ZrS2 two-dimensional materials allows tuning the optical properties in a wide visible spectrum that can be used in various electronic and optical applications, including solar cells.![]()
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Affiliation(s)
- Mohammadreza Razeghizadeh
- School of Electrical and Computer Engineering, College of Engineering, University of Tehran Tehran 14395-515 Iran
| | - Mahdi Pourfath
- School of Electrical and Computer Engineering, College of Engineering, University of Tehran Tehran 14395-515 Iran
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Ougherb C, Ouahrani T, Badawi M, Morales-García Á. Effect of the sulfur termination on the properties of Hf 2CO 2 MXene. Phys Chem Chem Phys 2022; 24:7243-7252. [PMID: 35274659 DOI: 10.1039/d2cp00288d] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A computational study was carried out to investigate the effect of surface termination on Janus Hf2COS MXene by substituting partly the O-terminated layer with S atoms. Our predictions confirm that this chemical strategy allows one to tailor the band gap of MXenes. Indeed, the semiconducting character of Hf2CO2 MXene decreases by the exchange of O by S atoms. From a structural point of view, dynamical, mechanical, and thermal analysis confirm the thermodynamic stability of the Janus Hf2COS MXene, which shows metallic character. Furthermore, topological chemical analysis indicates an ionic nature of Hf2CO2 MXene that tends to be reduced by increasing the concentration of S atoms, promoting a covalent character. Shortly, the present study illustrates how the properties of MXenes can be tailored by functionalizing them with different chemical terminations.
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Affiliation(s)
- Chewki Ougherb
- Laboratoire de Physique Théorique, Université de Tlemcen, 1300, Algeria.
| | - Tarik Ouahrani
- Laboratoire de Physique Théorique, Université de Tlemcen, 1300, Algeria.
| | - Michael Badawi
- Université de Lorraine and CNRS, LPCT, UMR 7019, 54506 Vandoeuvre-lés-Nancy, France
| | - Ángel Morales-García
- Departament de Ciéncia de Materials i Química Física & Institut de Química Teórica i Computacional (IQTCUB), Universitat de Barcelona, c/Martí i Franquès 1-11, 08028 Barcelona, Spain.
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Guo R, Wei X, Cao M, Zhang Y, Yang Y, Fan J, Liu J, Tian Y, Zhao Z, Duan L. Optical and Tunable Electronic Properties of AlAs/InSe Van Der Waals Heterostructures. ACTA CHIMICA SINICA 2022. [DOI: 10.6023/a21120543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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7
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King'ori GW, Ouma CNM, Mishra AK, Amolo GO, Makau NW. Two-dimensional graphene-HfS 2 van der Waals heterostructure as electrode material for alkali-ion batteries. RSC Adv 2020; 10:30127-30138. [PMID: 35518262 PMCID: PMC9056275 DOI: 10.1039/d0ra04725b] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 07/31/2020] [Indexed: 01/29/2023] Open
Abstract
Poor electrical conductivity and large volume expansion during repeated charge and discharge is what has characterized many battery electrode materials in current use. This has led to 2D materials, specifically multi-layered 2D systems, being considered as alternatives. Among these 2D multi-layered systems are the graphene-based van der Waals heterostructures with transition metal di-chalcogenides (TMDCs) as one of the layers. Thus in this study, the graphene–hafnium disulphide (Gr–HfS2) system, has been investigated as a prototype Gr–TMDC system for application as a battery electrode. Density functional theory calculations indicate that Gr–HfS2 van der Waals heterostructure formation is energetically favoured. In order to probe its battery electrode application capability, Li, Na and K intercalants were introduced between the layers of the heterostructure. Li and K were found to be good intercalants as they had low diffusion barriers as well as a positive open circuit voltage. A comparison of bilayer graphene and bilayer HfS2 indicates that Gr–HfS2 is a favourable battery electrode system. A high rate capacity, moderate volume expansion and energetically stable alkali ion graphene–HfS2 electrode material.![]()
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Affiliation(s)
- Gladys W King'ori
- University of Eldoret P.O. Box 1125 - 30100 Eldoret Kenya .,Technical University of Kenya Haile Selassie Avenue, P.O. Box 52428 - 00200 Nairobi Kenya
| | - Cecil N M Ouma
- HySA-Infrastructure, North-West University, Faculty of Engineering Private Bag X6001 Potchefstroom 2520 South Africa
| | - Abhishek K Mishra
- Department of Physics, School of Engineering, University of Petroleum and Energy Studies Bidholi via Premnagar Dehradun 248007 India
| | - George O Amolo
- Technical University of Kenya Haile Selassie Avenue, P.O. Box 52428 - 00200 Nairobi Kenya
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