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Electronic Properties of Triangle Molybdenum Disulfide (MoS 2) Clusters with Different Sizes and Edges. Molecules 2021; 26:molecules26041157. [PMID: 33671512 PMCID: PMC7927058 DOI: 10.3390/molecules26041157] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 01/29/2021] [Accepted: 02/02/2021] [Indexed: 11/17/2022] Open
Abstract
The electronic structures and transition properties of three types of triangle MoS2 clusters, A (Mo edge passivated with two S atoms), B (Mo edge passivated with one S atom), and C (S edge) have been explored using quantum chemistry methods. The highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) gap of B and C is larger than that of A, due to the absence of the dangling of edge S atoms. The frontier orbitals (FMOs) of A can be divided into two categories, edge states from S3p at the edge and hybrid states of Mo4d and S3p covering the whole cluster. Due to edge/corner states appearing in the FMOs of triangle MoS2 clusters, their absorption spectra show unique characteristics along with the edge structure and size.
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Sajid H, Ullah F, Yar M, Ayub K, Mahmood T. Superhalogen doping: a new and effective approach to design materials with excellent static and dynamic NLO responses. NEW J CHEM 2020. [DOI: 10.1039/d0nj02291h] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The first-ever example where superhalogen doping alone is introduced as a new and effective approach to impart large NLO responses.
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Affiliation(s)
- Hasnain Sajid
- Department of Chemistry
- COMSATS University Islamabad
- Abbottabad-22060
- Pakistan
| | - Faizan Ullah
- Department of Chemistry
- COMSATS University Islamabad
- Abbottabad-22060
- Pakistan
| | - Muhammad Yar
- Department of Chemistry
- COMSATS University Islamabad
- Abbottabad-22060
- Pakistan
| | - Khurshid Ayub
- Department of Chemistry
- COMSATS University Islamabad
- Abbottabad-22060
- Pakistan
| | - Tariq Mahmood
- Department of Chemistry
- COMSATS University Islamabad
- Abbottabad-22060
- Pakistan
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Hu Y, Xu X, Jiang Y, Zhang G, Li W, Sun X, Tian WQ, Feng Y. Double-helix PnLin chains: novel potential nonlinear optical materials. Phys Chem Chem Phys 2018; 20:12618-12623. [DOI: 10.1039/c8cp01116h] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The structures, circular dichroism (CD) spectra and nonlinear optical (NLO) responses of a series of inorganic double-helix chains, PnLin (n = 6–12), have been investigated using the quantum chemistry method.
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Affiliation(s)
- Yangyang Hu
- Key Laboratory of Green Chemical Technology of College of Heilongjiang Province
- College of Chemical and Environmental Engineering
- Harbin University of Science and Technology
- Harbin 150080
- China
| | - Xiaodong Xu
- Department of Physics
- Harbin Institute of Technology
- Harbin 150001
- China
| | - Yingjie Jiang
- Key Laboratory of Green Chemical Technology of College of Heilongjiang Province
- College of Chemical and Environmental Engineering
- Harbin University of Science and Technology
- Harbin 150080
- China
| | - Guiling Zhang
- Key Laboratory of Green Chemical Technology of College of Heilongjiang Province
- College of Chemical and Environmental Engineering
- Harbin University of Science and Technology
- Harbin 150080
- China
| | - Weiqi Li
- Department of Physics
- Harbin Institute of Technology
- Harbin 150001
- China
| | - Xiudong Sun
- Department of Physics
- Harbin Institute of Technology
- Harbin 150001
- China
- Key Laboratory of Micro-Nano Optoelectronic Information System
| | - Wei Quan Tian
- College of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing
- P. R. China
| | - Yunan Feng
- Department of Integrated Service
- Heilongjiang Undergraduate Career and Entrepreneurship Center
- Harbin 150090
- China
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Muhammad S, Nakano M, Al-Sehemi AG, Kitagawa Y, Irfan A, Chaudhry AR, Kishi R, Ito S, Yoneda K, Fukuda K. Role of a singlet diradical character in carbon nanomaterials: a novel hot spot for efficient nonlinear optical materials. NANOSCALE 2016; 8:17998-18020. [PMID: 27722408 DOI: 10.1039/c6nr06097h] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Carbon atoms have the potential to produce a variety of fascinating all-carbon structures with amazing electronic and mechanical properties. Over the last few decades, several efforts have been made using experimental and computational techniques to functionalize graphene, carbon nanotubes and fullerenes for potential use in modern hi-tech electronic, medicinal, optical and nonlinear optical (NLO) applications. Since photons replaced electrons as a carrier of information, the field of NLO material design has drawn immense interest in contemporary materials science. There have been several reports of bridging the gap between the exciting fields of carbon nanomaterials and NLO materials by functionalizing carbon nanomaterials for potential NLO applications. In contrast to previous reports of the design of third-order NLO materials using conventional closed-shell materials, a novel strategy using open-shell diradical molecular systems has recently been proposed. Quantum chemically, diradical character is explained in terms of the instability of the chemical bonds in open-shell molecular systems. Interestingly, several carbon nanomaterials, which naturally possess open-shell singlet configurations, have recently gained momentum in the design of these classes of open-shell NLO materials with excellent NLO properties, stability and diversity. The present review establishes a systematic sequence of different studies (spanning over two decades of intense research efforts), starting from the simplest theoretical two-site diradical model, continuing to its experimental and theoretical realization in actual chemical systems, and finally applying the abovementioned model/rule to novel carbon nanomaterials to tune their NLO properties, particularly their second hyperpolarizability (γ). In the present report, we highlight several recent efforts to functionalize carbon nanomaterials by exploiting their open-shell diradical character to achieve efficient third-order NLO properties. Several issues and opportunities are discussed, including the inherited disadvantages of both experimental (the high reactivity and short life of diradical compounds) and quantum (need for multi-reference methodology) techniques when dealing with carbon nanomaterials. A comparative analysis of several quantum chemical investigations, along with contemporary experimental results, will be performed to emphasize the core issues and opportunities related to carbon nanomaterials with singlet open-shell diradical character. Thus, the present review will highlight carbon nanomaterials with diradical/biradical character for their prospective applications in the NLO field.
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Affiliation(s)
- Shabbir Muhammad
- Department of Physics, College of Science, King Khalid University, Abha 61413, P.O. Box 9004, Saudi Arabia and Research Center for Advanced Materials Science (RCAMS), King Khalid University, Abha 61413, P.O. Box 9004, Saudi Arabia.
| | - Masayoshi Nakano
- Department of Materials Engineering Science, Graduate School of Engineering Science Osaka University Toyonaka, Osaka 560-8531, Japan. and Center for Spintronics Research Network (CSRN), Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Abdullah G Al-Sehemi
- Research Center for Advanced Materials Science (RCAMS), King Khalid University, Abha 61413, P.O. Box 9004, Saudi Arabia. and Department of Chemistry, College of Science, King Khalid University, Abha 61413, P.O. Box 9004, Saudi Arabia
| | - Yasutaka Kitagawa
- Department of Materials Engineering Science, Graduate School of Engineering Science Osaka University Toyonaka, Osaka 560-8531, Japan. and Center for Spintronics Research Network (CSRN), Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Ahmad Irfan
- Research Center for Advanced Materials Science (RCAMS), King Khalid University, Abha 61413, P.O. Box 9004, Saudi Arabia. and Department of Chemistry, College of Science, King Khalid University, Abha 61413, P.O. Box 9004, Saudi Arabia
| | - Aijaz R Chaudhry
- Department of Physics, College of Science, King Khalid University, Abha 61413, P.O. Box 9004, Saudi Arabia and Research Center for Advanced Materials Science (RCAMS), King Khalid University, Abha 61413, P.O. Box 9004, Saudi Arabia.
| | - Ryohei Kishi
- Department of Materials Engineering Science, Graduate School of Engineering Science Osaka University Toyonaka, Osaka 560-8531, Japan.
| | - Soichi Ito
- Department of Materials Engineering Science, Graduate School of Engineering Science Osaka University Toyonaka, Osaka 560-8531, Japan.
| | - Kyohei Yoneda
- Department of Chemical Engineering, National Institute of Technology, Nara College, 22 Yata-cho, Yamatokoriyama, Nara, Japan
| | - Kotaro Fukuda
- Department of Materials Engineering Science, Graduate School of Engineering Science Osaka University Toyonaka, Osaka 560-8531, Japan.
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Su J, Yang K. Temperature dependence of the transport of single-file water molecules through a hydrophobic channel. J Comput Chem 2016; 37:1043-7. [PMID: 26777386 DOI: 10.1002/jcc.24303] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Revised: 12/23/2015] [Accepted: 12/27/2015] [Indexed: 02/02/2023]
Abstract
Although great effort has been made on the transport properties of water molecules through nanometer channels, our understanding on the effect of some basic parameters are still rather poor. In this article, we use molecular dynamics simulations to study the temperature effect on the transport of single-file water molecules through a hydrophobic channel. Of particular interest is that the water flow and average translocation time both exhibit exponential relations with the temperature. Based on the continuous-time random-walk model and Arrhenius equation, we explore some new physical insights on these exponential behaviors. With the increase of temperature, the water dipoles flip more frequently, since the estimated flipping barrier is less than 2 kB T. Specifically, the flipping frequency also shows an exponential relation with the temperature. Furthermore, the water-water interaction and water occupancy demonstrate linear relations with the temperature, and the water density profiles along the channel axis can be slightly affected by the temperature. These results not only enhance our knowledge about the temperature effect on the single-file water transport, but also have potential implications for the design of controllable nanofluidic machines.
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Affiliation(s)
- Jiaye Su
- Department of Applied Physics; Nanjing University of Science and Technology; Nanjing Jiangsu 210094 China
| | - Keda Yang
- Department of Supercomputing Center; Computer Network Information Center, Chinese Academy of Sciences; Beijing 100190 China
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Hu YY, Li WQ, Yang L, Feng JK, Tian WQ. The electronic properties and nonlinear optical responses of the intermediate structures in rolling graphene to carbon nanotubes. CAN J CHEM 2016. [DOI: 10.1139/cjc-2015-0325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
From the same piece of finite size graphene (F-graphene) sheet through different directions (zigzag edge or armchair edge), (4, 4) and (8, 0) carbon nanotube clips form. The electronic properties of the intermediate structures in the two rolling processes 44 (zigzag) and 80 (armchair) have been investigated using quantum chemistry method. The magnetism of the F-graphene sheet disappears with the rolling operation in 44, while it is maintained throughout the whole rolling operation in 80. Furthermore, the highest occupied molecular orbital (HOMO) α and HOMO β gradually extend to the whole framework from the zigzag edges with the rolling operation in 44, and they gradually localize to the lower and upper half of the framework in 80. Oxygen passivation along the opening of the intermediate structures effectively improves the nonlinear optical (NLO) response of the intermediate structures in both the zigzag and the armchair processes. Oxygen passivation along the armchair opening in 80 enhances the βtot value, yet does not bring essential changes to the electron transitions contributed to the NLO response. Oxygen passivation along the zigzag opening in 44 is able not only to enhance the βtot value but also to change the transition nature of electron excitations with a major contribution to the NLO response.
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Affiliation(s)
- Yang-Yang Hu
- State Key Laboratory of Urban Water Resource and Environment, Institute of Theoretical and Simulational Chemistry, Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology, 150080 Harbin, P.R. China
| | - Wei-Qi Li
- Department of Physics, Harbin Institute of Technology, 150001 Harbin, P.R. China
| | - Li Yang
- State Key Laboratory of Urban Water Resource and Environment, Institute of Theoretical and Simulational Chemistry, Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology, 150080 Harbin, P.R. China
| | - Ji-Kang Feng
- Institute of Theoretical Chemistry and College of Chemistry, Jilin University, 130023 Changchun, P.R. China
| | - Wei Quan Tian
- State Key Laboratory of Urban Water Resource and Environment, Institute of Theoretical and Simulational Chemistry, Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology, 150080 Harbin, P.R. China
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