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Ahmad RB, Anwar AW, Ali A, Fatima T, Moin M, Nazir A, Batool A, Shabir U. Pressure-dependent band gap engineering with structural, electronic, mechanical, optical, and thermal properties of CsPbBr 3: first-principles calculations. J Mol Model 2024; 30:270. [PMID: 39014125 DOI: 10.1007/s00894-024-06040-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2024] [Accepted: 06/21/2024] [Indexed: 07/18/2024]
Abstract
CONTEXT In the renewable industry, pressure-dependent CsPbBr3 perovskite has a lot of potential due to its exceptional properties. Present work revealed the mechanical stability of CsPbBr3 between 0 to 50 GPa. The bandgap of unstressed CsPbBr3 is 2.90 eV, indicating a direct bandgap. Band gap values decrease by increasing external pressure. CsPbBr3 structure showed a direct band gap from 0 to 35 GPa and in-direct from 40 to 50 GPa. The unit cell volume and lattice constants are substantially decreased. Mechanical parameters, i.e., Young's modulus, bulk modulus, anisotropy factor, shear modulus, and poison's ratio are obtained. Under ambient conditions, the mechanical properties of CsPbBr3 showed ductile behavior and with induced pressure, their ductility has significantly improved. By applying stresses ranging from 0 to 50 GPa, the considerable fluctuation in values of dielectric function (imaginary and real), absorption, reflectivity, loss function, refractive index (imaginary and real), and conductivity (imaginary and real), was also identified. When pressure rises, the optical parameters increase and drag in the direction of high energies. Response functions are used to predict the density of states and the phonon lattice dispersion to study the phonon properties. By using the quasi-harmonic Debye model, the thermal effect on the free energy, entropy, enthalpy, and heat capacity were predicted and compared. These results would be useful for theoretical research and indicate how external pressure significantly affects the physical characteristics of CsPbBr3 perovskites, which may open up new possibilities for use in optoelectronic, photonic, and solar cell applications. METHODS The structural, electrical, mechanical, optical, and thermal properties of cesium lead bromide (CsPbBr3) are investigated by applying external pressure from 0 to 50 GPa, using generalized gradient approximations (GGA) and Perdew-Burke-Ernzerhof (PBE) with CASTEP code built-in material studio by density functional theory (DFT).
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Affiliation(s)
- Rana Bilal Ahmad
- Department of Physics, Faculty of Nano Science and Technology, University of Engineering and Technology, Lahore, Pakistan.
| | - Abdul Waheed Anwar
- Department of Physics, Faculty of Nano Science and Technology, University of Engineering and Technology, Lahore, Pakistan
| | - Anwar Ali
- Department of Physics, Faculty of Nano Science and Technology, University of Engineering and Technology, Lahore, Pakistan
| | - Tehreem Fatima
- Department of Physics, Faculty of Nano Science and Technology, University of Engineering and Technology, Lahore, Pakistan
| | - Muhammad Moin
- Department of Physics, Faculty of Nano Science and Technology, University of Engineering and Technology, Lahore, Pakistan
| | - Amna Nazir
- Department of Physics, Faculty of Nano Science and Technology, University of Engineering and Technology, Lahore, Pakistan
| | - Asma Batool
- Department of Physics, Faculty of Nano Science and Technology, University of Engineering and Technology, Lahore, Pakistan
| | - Umer Shabir
- Department of Physics, Faculty of Nano Science and Technology, University of Engineering and Technology, Lahore, Pakistan
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Senanayake HS, Ho TA. Energetics of water expulsion from intervening space between two particles during aggregation. J Colloid Interface Sci 2024; 666:505-511. [PMID: 38613973 DOI: 10.1016/j.jcis.2024.04.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 02/29/2024] [Accepted: 04/05/2024] [Indexed: 04/15/2024]
Abstract
Solvent expulsion away from an intervening region between two approaching particles plays important roles in particle aggregation yet remains poorly understood. In this work, we use metadynamics molecular simulations to study the free energy landscape of removing water molecules from gibbsite and pyrophyllite slit pores representing the confined spaces between two approaching particles. For gibbsite, removing water from the intervening region is both entropically and enthalpically unfavorable. The closer the particles approach each other, the harder it is to expel water molecules. For pyrophyllite, water expulsion is spontaneous, which is different from the gibbsite system. A smaller pore makes the water removal more favorable. When water is being drained from the intervening region, single chains of water molecules are observed in gibbsite pore, while in pyrophyllite pore water cluster is usually observed. Water-gibbsite hydrogen bonds help stabilize water chains, while water forms clusters in pyrophyllite pore to maximize the number of hydrogen bonds among themselves. This work provides the first assessment into the energetics and structure of water being drained from the intervening region between two approaching particles during oriented attachment and aggregation.
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Affiliation(s)
- Hasini S Senanayake
- Geochemistry Department, Sandia National Laboratories, Albuquerque, NM 87185, USA
| | - Tuan A Ho
- Geochemistry Department, Sandia National Laboratories, Albuquerque, NM 87185, USA.
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Banerjee P, Prakapenka VB, Chariton S, Shevchenko EV. Compressibility Studies of Copper Selenides Obtained by Cation Exchange Reaction Revealing the New CsCl Phase. NANO LETTERS 2024; 24:6981-6989. [PMID: 38814739 DOI: 10.1021/acs.nanolett.4c01285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2024]
Abstract
In this study, we conducted a high-pressure investigation of Cu2-xSe nanostructures with pyramid- and plate-like morphologies, created through cation exchange from zinc-blende CdSe nanocrystals and wurtzite CdSe nanoplatelets respectively. Using a diamond anvil cell setup at the APS synchrotron, we observed the phase transitions in the Cu2-xSe nanostructures up to 40 GPa, identifying a novel CsCl-type lattice with Pm3̅m symmetry above 4 GPa. This CsCl-type structure, previously unreported in copper selenides, was partially retained after decompression. Our results indicate that the initial crystalline structure of CdSe does not affect the stability of Cu2-xSe nanostructures formed via cation exchange. Both morphologies of Cu2-xSe sintered under compression, potentially contributing to the stabilization of the high-pressure phase through interfacial defects. These findings are significant for discovering new phases with potential applications in future technologies.
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Affiliation(s)
- Progna Banerjee
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Vitali B Prakapenka
- Center for Advanced Radiation Sources, The University of Chicago, Chicago, Illinois 60637, United States
| | - Stella Chariton
- Center for Advanced Radiation Sources, The University of Chicago, Chicago, Illinois 60637, United States
| | - Elena V Shevchenko
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, United States
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Jiang S, Chen X, Huang X, Li C, Wang Z, Zhao B, Zhang L, Zhou G, Fang J. Randomly Layered Superstructure of In 2O 3 Truncated Nano-Octahedra and Its High-Pressure Behavior. J Am Chem Soc 2024; 146:8598-8606. [PMID: 38465613 DOI: 10.1021/jacs.4c00563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2024]
Abstract
This study outlines the preparation and characterization of a unique superlattice composed of indium oxide (In2O3) vertex-truncated nano-octahedra, along with an exploration of its response to high-pressure conditions. Transmission electron microscopy and scanning transmission electron microscopy were employed to determine the average circumradius (15.2 nm) of these vertex-truncated building blocks and their planar superstructure. The resilience and response of the superlattice to pressure variations, peaking at 18.01 GPa, were examined using synchrotron-based wide-angle X-ray scattering (WAXS) and small-angle X-ray scattering (SAXS) techniques. The WAXS data revealed no phase transitions, reinforcing the stability of the 2D superlattice composed of random layers in alignment with a p31m planar symmetry as discerned by SAXS. Notably, the SAXS data also unveiled a pressure-induced, irreversible translation of octahedra and ligand interaction occurring within the random layer. Through our examination of these pressure-sensitive behaviors, we identified a distinctive translation model inherent to octahedra and observed modulation of the superlattice cell parameter induced by pressure. This research signifies a noteworthy advancement in deciphering the intricate behaviors of 2D superlattices under a high pressure.
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Affiliation(s)
- Shaojie Jiang
- Materials Science and Engineering Program, State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Xiaobo Chen
- Materials Science and Engineering Program, State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Xin Huang
- Cornell High Energy Synchrotron Source, Cornell University, Ithaca, New York 14853, United States
| | - Can Li
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Zhongwu Wang
- Cornell High Energy Synchrotron Source, Cornell University, Ithaca, New York 14853, United States
| | - Bo Zhao
- College of Arts & Sciences Microscopy, Texas Tech University, Lubbock, Texas 79409, United States
| | - Lihua Zhang
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Guangwen Zhou
- Materials Science and Engineering Program, State University of New York at Binghamton, Binghamton, New York 13902, United States
- Department of Mechanical Engineering, State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Jiye Fang
- Materials Science and Engineering Program, State University of New York at Binghamton, Binghamton, New York 13902, United States
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, United States
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Lv P, Zhao D, Ma Z, Cong M, Sui Y, Xiao G, Zou B. Pressure-Modulated Interface Engineering toward Realizing Core@Shell Configuration Transition. NANO LETTERS 2023; 23:11982-11988. [PMID: 38051759 DOI: 10.1021/acs.nanolett.3c04359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
The strained interface of core@shell nanocrystals (NCs) can effectively modulate the energy level alignment, thereby significantly affecting the optical properties. Herein, the unique photoluminescence (PL) response of doped Mn ions is introduced as a robust probe to detect the targeted pressure-strain relation of CdS@ZnS NCs. Results show that the core experiences actually less pressure than the applied external pressure, attributed to the pressure-induced optimized interface that reduces the compressive strain on core. The pressure difference between core and shell increases the conduction band and valence band offsets and further achieves the core@shell configuration transition from quasi type II to type I. Accordingly, the PL intensity of CdS@ZnS NCs slightly increases, along with a faster blue-shift rate of PL peak under low pressure. This study elucidates the interplay between external physical pressure and interfacial chemical stress for core@shell NCs, leading to precise construction of interface engineering for practical applications.
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Affiliation(s)
- Pengfei Lv
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, People's Republic of China
| | - Dianlong Zhao
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, People's Republic of China
| | - Zhiwei Ma
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, People's Republic of China
| | - Ming Cong
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, People's Republic of China
| | - Yongming Sui
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, People's Republic of China
| | - Guanjun Xiao
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, People's Republic of China
| | - Bo Zou
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, People's Republic of China
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