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Dharmale N, Chaudhury S, Dash D. Investigating the naturally occurring forms of TiO 2 on electronic and optical properties using OLCAO-MGGA-TBO9: a hybrid DFT study. MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING 2021; 29:025001. [DOI: 10.1088/1361-651x/abb6de] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/19/2023]
Abstract
Abstract
In this paper, a detailed study and analysis on the electronic and optical properties of anatase, rutile and brookite titanium dioxide (TiO2) which are the naturally occurring phases of TiO2 have been carried out. We have obtained these properties using the self-consistent orthogonalized linear combination of atomic orbitals with meta-generalized gradient approximation (MGGA) and Tran and Blaha (TBO9) as exchange–correlation under the framework of density functional theory. Obtained results on band gap value (E
g), dielectric constant and refractive index as calculated by considering the optimal value of c (system-dependent parameter) have been analyzed statistically and are found to be much closer to the experimental values and are better than the other approaches published in the literature. It is seen that optical absorption for all the three phases of TiO2 occurs in UV region of EM spectrum. Using statistical analysis in correlation with other effective methods such as mBJ, GGA + U, GGA + Ud + Up, LSD + U, GW and HSE06 functional, it is found that MGGA-TB09 gives a better description of electronic structure and optical properties with less computation time. This work provides good understanding of electronic and optical properties of TiO2, stems a foundation for its possible applications in photo catalytic activities of dye sensitized solar cells.
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Dharmale N, Chaudhury S, Pandey CK, Mahamune R. Determination of Structural, Electronic, Optical and Mechanical Properties of Brookite TiO 2Using Various Exchange-Correlation. 2020 IEEE VLSI DEVICE CIRCUIT AND SYSTEM (VLSI DCS) 2020. [DOI: 10.1109/vlsidcs47293.2020.9179928] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/19/2023]
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Dharmale N, Chaudhury S, Mahamune R, Dash D. Comparative study on structural, electronic, optical and mechanical properties of normal and high pressure phases titanium dioxide using DFT. MATERIALS RESEARCH EXPRESS 2020; 7:054004. [DOI: 10.1088/2053-1591/ab8d5c] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/19/2023]
Abstract
Abstract
In this paper, a Self-consistent Orthogonalized linear combination of atomic orbitals (OLCAO) technique with a generalized gradient approximation such as Perdew–Burke–Ernzerhof Solid (GGA-PBE SOL) has been used to scrutinize the structural, optical, electronic and mechanical properties of normal pressure phase (Anatase and Rutile) and high pressure phase i.e., cubic (Fluorite and Pyrite) TiO2. Electronic and optical properties of normal pressure phases of TiO2 are also investigated using (Meta) MGGA-Tran and Blaha (TB09) and obtained results are a close approximation of experimental data. It is seen that the virtually synthesized structural parameter for cubic and tetragonal phases of TiO2 are consistent with experimental and theoretical data. From the effective mass of charge carriers (m*), it can be observed that pyrite TiO2 is having lower effective mass than the fluorite and hence shows higher photocatalytic activity than fluorite. Furthermore, it is seen that fluorite is more dense than anatase, rutile and pyrite TiO2. From the theoretical calculations on the optical properties, it can be concluded that optical absorption occursin the near UV region for high and normal pressue phases of TiO2. Again from the reflectivity characteristics R(ω), it can be concluded that TiO2 can be used as a coating material. Elastic constants, elastic compliance constants, mechanical properties are obtained for anatase, rutile, fluorite and pyrite TiO2. A comparison of the results with previously reported theoretical and experimental data shows that the calculated properties are in better agreement with the previously reported experimental and theoretical results.
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Dash D, Pandey CK, Chaudhary S, Tripathy SK. Structural, electronic, and mechanical properties of anatase titanium dioxide. ACTA ACUST UNITED AC 2019. [DOI: 10.1108/mmms-03-2018-0043] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
PurposeThe purpose of this paper is to analyze various properties of anatase titanium dioxide (TiO2) nanoparticles. Further, it proposes to implement Linear Combinations of Atomic Orbitals (LCAO) basis set under the framework of density functional theory and outline how LCAO is able to provide improved results in terms of various mechanical properties rather than plane wave and other theoretical results.Design/methodology/approachThis paper provides an exploratory study on anatase TiO2by implementing OLCAO–DFT–LDA–LBFGS–EOS–PZ algorithms to find out various ground-level properties. The data so obtained are complemented by various analysis using mathematical expressions, description of internal processes occurred and comparison to others’ analytical results.FindingsThe paper provides some empirical insights on how mechanical properties of anatase TiO2improved by implementing LCAO methodology. From the analysis of electronic properties, it is seen that the anatase TiO2supports the inter band indirect transition from O-2p in valence region to Ti-3d in the conduction region.Research limitations/implicationsMost of the electronic properties are underestimated because a single exchange-correlation potential is not continuous across the gap. This gap can be enhanced by implementing Green’s function in place of DFT and the other way is to implement self-interaction correction.Practical implicationsThe use of anatase TiO2is primarily used for catalytic applications. This is also used to enhance the quality of paper in the paper industry. Additionally, this is used as a prime ingredient in cosmetic industry.Originality/valueThis paper fulfills an identified need to study how LCAO, another basis set, plays an important role in improving material properties.
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Dash D, Chaudhury S. A Density Functional Theory based Analysis on the Electronic, Mechanical, and Optical Properties of Cubic TiO2. MATERIALS TODAY: PROCEEDINGS 2019; 18:596-605. [DOI: 10.1016/j.matpr.2019.06.453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/19/2023]
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Dash D, Chaudhury S, Tripathy SK. A Density Functional Theory-Based Study of Electronic and Optical Properties of Anatase Titanium Dioxide. ADVANCES IN COMMUNICATION, DEVICES AND NETWORKING 2018:57-67. [DOI: 10.1007/978-981-10-7901-6_8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/19/2023]
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Dash D, Chaudhury S, Tripathy SK. First principle investigation of structural and optical properties of cubic titanium dioxide. AIP CONFERENCE PROCEEDINGS 2018. [DOI: 10.1063/1.5033322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/19/2023]
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Dash D, Pandey CK, Chaudhury S, Tripathy SK. Structural, electronic, and mechanical properties of cubic TiO 2: A first-principles study. CHINESE PHYSICS B 2018; 27:017102. [DOI: 10.1088/1674-1056/27/1/017102] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/19/2023]
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Korotkova I, Sakhno T, Drobit‘ko I, Sakhno Y, Ostapenko N. Structure of poly(di-n-hexylsilane) in nanoporous materials. Chem Phys 2010. [DOI: 10.1016/j.chemphys.2010.06.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Rajter R, French RH, Podgornik R, Ching WY, Parsegian VA. Spectral mixing formulations for van der Waals-London dispersion interactions between multicomponent carbon nanotubes. JOURNAL OF APPLIED PHYSICS 2008; 104:53513. [PMID: 19529795 PMCID: PMC2685217 DOI: 10.1063/1.2975207] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2008] [Accepted: 06/27/2008] [Indexed: 05/27/2023]
Abstract
Recognition of spatially varying optical properties is a necessity when studying the van der Waals-London dispersion (vdW-Ld) interactions of carbon nanotubes (CNTs) that have surfactant coatings, tubes within tubes, andor substantial core sizes. The ideal way to address these radially dependent optical properties would be to have an analytical add-a-layer solution in cylindrical coordinates similar to the one readily available for the plane-plane geometry. However, such a formulation does not exist nor does it appear trivial to be obtained exactly. The best and most pragmatic alternative for end-users is to take the optical spectra of the many components and to use a spectral mixing formulation so as to create effective solid-cylinder spectra for use in the far-limit regime. The near-limit regime at "contact" is dominated by the optical properties of the outermost layer, and thus no spectral mixing is required. Specifically we use a combination of a parallel capacitor in the axial direction and the Bruggeman effective medium in the radial direction. We then analyze the impact of using this mixing formulation upon the effective vdW-Ld spectra and the resulting Hamaker coefficients for small and large diameter single walled CNTs (SWCNTs) in both the near- and far-limit regions. We also test the spectra of a [16,0,s+7,0,s] multiwalled CNT (MWCNT) with an effective MWCNT spectrum created by mixing its [16,0,s] and [7,0,s] SWCNT components to demonstrate nonlinear coupling effects that exist between neighboring layers. Although this paper is primarily on nanotubes, the strategies, implementation, and analysis presented are applicable and likely necessary to any system where one needs to resolve spatially varying optical properties in a particular Lifshitz formulation.
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Rajter RF, French RH. New perspectives on van der Waals–London interactions of materials. From planar interfaces to carbon nanotubes. ACTA ACUST UNITED AC 2008. [DOI: 10.1088/1742-6596/94/1/012001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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French RH, Winey KI, Yang MK, Qiu W. Optical Properties and van der Waals - London Dispersion Interactions of Polystyrene Determined by Vacuum Ultraviolet Spectroscopy and Spectroscopic Ellipsometry. Aust J Chem 2007. [DOI: 10.1071/ch06222] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The interband optical properties of polystyrene in the vacuum ultraviolet (VUV) region have been investigated using combined spectroscopic ellipsometry and VUV spectroscopy. Over the range 1.5–32 eV, the optical properties exhibit electronic transitions we assign to three groupings, E1, E2, and E3, corresponding to a hierarchy of interband transitions of aromatic (π → π*), non-bonding (n → π*, n → σ*), and saturated (σ → σ*) orbitals. In polystyrene there are strong features in the interband transitions arising from the side-chain π bonding of the aromatic ring consisting of a shoulder at 5.8 eV (E1′) and a peak at 6.3 eV (E1), and from the σ bonding of the C–C backbone at 12 eV (E3′) and 17.1 eV (E3). These E3 transitions have characteristic critical point line shapes associated with one-dimensionally delocalized electron states in the polymer backbone. A small shoulder at 9.9 eV (E2) is associated with excitations possibly from residual monomer or impurities. Knowledge of the valence electronic excitations of a material provides the necessary optical properties to calculate the van der Waals–London dispersion interactions using Lifshitz quantum electrodynamics theory and full spectral optical properties. Hamaker constants and the van der Waals–London dispersion component of the surface free energy for polystyrene were determined. These Lifshitz results were compared to the total surface free energy of polystyrene, polarity, and dispersive component of the surface free energy as determined from contact angle measurements with two liquids, and with literature values. The Lifshitz approach, using full spectral Hamaker constants, is a more direct determination of the van der Waals–London dispersion component of the surface free energy of polystyrene than other methods.
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Damin A, Llabrés i Xamena FX, Lamberti C, Civalleri B, Zicovich-Wilson CM, Zecchina A. Structural, Electronic, and Vibrational Properties of the Ti−O−Ti Quantum Wires in the Titanosilicate ETS-10. J Phys Chem B 2003. [DOI: 10.1021/jp036902e] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alessandro Damin
- Dipartimento di Chimica IFM, Università di Torino, Via P. Giuria 7, I-10125 Torino, Italy, INSTM UdR Torino Università, INFM UdR Torino Università, and Facultad de Ciencias, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa, 62210 Cuernavaca (Morelos), Mexico
| | - Francesc X. Llabrés i Xamena
- Dipartimento di Chimica IFM, Università di Torino, Via P. Giuria 7, I-10125 Torino, Italy, INSTM UdR Torino Università, INFM UdR Torino Università, and Facultad de Ciencias, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa, 62210 Cuernavaca (Morelos), Mexico
| | - Carlo Lamberti
- Dipartimento di Chimica IFM, Università di Torino, Via P. Giuria 7, I-10125 Torino, Italy, INSTM UdR Torino Università, INFM UdR Torino Università, and Facultad de Ciencias, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa, 62210 Cuernavaca (Morelos), Mexico
| | - Bartolomeo Civalleri
- Dipartimento di Chimica IFM, Università di Torino, Via P. Giuria 7, I-10125 Torino, Italy, INSTM UdR Torino Università, INFM UdR Torino Università, and Facultad de Ciencias, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa, 62210 Cuernavaca (Morelos), Mexico
| | - Claudio M. Zicovich-Wilson
- Dipartimento di Chimica IFM, Università di Torino, Via P. Giuria 7, I-10125 Torino, Italy, INSTM UdR Torino Università, INFM UdR Torino Università, and Facultad de Ciencias, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa, 62210 Cuernavaca (Morelos), Mexico
| | - Adriano Zecchina
- Dipartimento di Chimica IFM, Università di Torino, Via P. Giuria 7, I-10125 Torino, Italy, INSTM UdR Torino Università, INFM UdR Torino Università, and Facultad de Ciencias, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa, 62210 Cuernavaca (Morelos), Mexico
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Winokur MJ, West R. X-ray Diffraction and Molecular Modeling Studies of Poly(di-n-alkylsilanes): The Near Planar Type Phases of Poly(di-n-butylsilane) and Poly(di-n-hexylsilane). Macromolecules 2003. [DOI: 10.1021/ma026017e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. J. Winokur
- Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, and Organosilicon Research Center, Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
| | - R. West
- Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, and Organosilicon Research Center, Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
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