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Journal articles on the topic 'Band gap tailoring'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

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1

Koo, Jahyun, Bing Huang, Hosik Lee, Gunn Kim, Jaewook Nam, Yongkyung Kwon, and Hoonkyung Lee. "Tailoring the Electronic Band Gap of Graphyne." Journal of Physical Chemistry C 118, no. 5 (January 27, 2014): 2463–68. http://dx.doi.org/10.1021/jp4087464.

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2

Li, W., Y. Wang, H. Lin, S. Ismat Shah, C. P. Huang, D. J. Doren, Sergey A. Rykov, J. G. Chen, and M. A. Barteau. "Band gap tailoring of Nd3+-doped TiO2 nanoparticles." Applied Physics Letters 83, no. 20 (November 17, 2003): 4143–45. http://dx.doi.org/10.1063/1.1627962.

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3

Chambouleyron, I. "Band‐gap tailoring in amorphous germanium‐nitrogen compounds." Applied Physics Letters 47, no. 2 (July 15, 1985): 117–19. http://dx.doi.org/10.1063/1.96288.

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4

Mangamma, G., T. N. Sairam, M. Chitra, and M. Manikandan. "Tailoring the band gap of ZnO nanostructures using chromium." Physica B: Condensed Matter 610 (June 2021): 412922. http://dx.doi.org/10.1016/j.physb.2021.412922.

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5

Shang, Shunli, Yi Wang, Zi-Kui Liu, Chia-En Yang, and Shizhuo Yin. "Band structure of FeBO3: Implications for tailoring the band gap of nanoparticles." Applied Physics Letters 91, no. 25 (December 17, 2007): 253115. http://dx.doi.org/10.1063/1.2824869.

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6

Nair, Aparna V., and B. Manoj. "Tailoring of Energy Band Gap inGraphene-like System by Fluorination." Mapana - Journal of Sciences 18, no. 1 (January 1, 2019): 55–66. http://dx.doi.org/10.12723/mjs.48.4.

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Fluorinated grapheme has a two-dimensional layer structure with a wide band gap. In the present study, Fluoro Graphene (FG) is obtained from Graphene Oxide (GO) through a deoxyfluorination reaction with the aid of Diethylaminosulphurtrifluoride (DAST). The FT-IR exhibited a peak at 1216 cm-1 and the shoulder at 1312 cm-1 were ascribed to the stretching vibration of covalent C–F bonds and C–F2 bonds, respectively. Surface morphology revealed a leafy structure in GO and a rocky structure in FG. The EDS analysis confirmed the fluorination of the graphitic structure. The TEM analysis confirmed the formation of a mixed structure of graphene and carbon dots. The results of structural, morphological and electrical properties of both graphene oxide and fluorographene show the possibility of using these samples as electronic/electrochemical devices in future.

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7

Yang, Lei, Qi Fu, Wenhui Wang, Jian Huang, Jianliu Huang, Jingyu Zhang, and Bin Xiang. "Large-area synthesis of monolayered MoS2(1−x)Se2x with a tunable band gap and its enhanced electrochemical catalytic activity." Nanoscale 7, no. 23 (2015): 10490–97. http://dx.doi.org/10.1039/c5nr02652k.

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8

Félix, Roberto, Alfons Weber, Ole Zander, Humberto Rodriguez-Álvarez, Björn-Arvid Schubert, Joachim Klaer, Regan G. Wilks, Hans-Werner Schock, Roland Mainz, and Marcus Bär. "Selenization of CuInS2 by rapid thermal processing – an alternative approach to induce a band gap grading in chalcopyrite thin-film solar cell absorbers?" Journal of Materials Chemistry A 7, no. 5 (2019): 2087–94. http://dx.doi.org/10.1039/c8ta10823d.

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9

Sernelius, B. E., K. F. Berggren, Z. C. Jin, I. Hamberg, and C. G. Granqvist. "Band-gap tailoring of ZnO by means of heavy Al doping." Physical Review B 37, no. 17 (June 15, 1988): 10244–48. http://dx.doi.org/10.1103/physrevb.37.10244.

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10

Sahu, Mitali, Pramod K. Singh, S. P. Pandey, and B. Bhattacharya. "Band Gap Tailoring of Ni Doped Ternary Semiconductors for Photovoltaic Applications." Macromolecular Symposia 347, no. 1 (January 2015): 68–74. http://dx.doi.org/10.1002/masy.201400059.

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11

Agarwal, V., and J. A. del Rı́o. "Tailoring the photonic band gap of a porous silicon dielectric mirror." Applied Physics Letters 82, no. 10 (March 10, 2003): 1512–14. http://dx.doi.org/10.1063/1.1559420.

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12

Wu, Aimin, Jing Li, Baodan Liu, Wenjin Yang, Yanan Jiang, Lusheng Liu, Xinglai Zhang, Changmin Xiong, and Xin Jiang. "Correction: Band-gap tailoring and visible-light-driven photocatalytic performance of porous (GaN)1−x(ZnO)x solid solution." Dalton Transactions 46, no. 14 (2017): 4860. http://dx.doi.org/10.1039/c7dt90047c.

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Correction for ‘Band-gap tailoring and visible-light-driven photocatalytic performance of porous (GaN)_1−x(ZnO)_x solid solution’ by Aimin Wu et al., Dalton Trans., 2017, 46, 2643–2652.

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13

Golubev, N. V., E. S. Ignat'eva, V. N. Sigaev, L. De Trizio, A. Azarbod, A. Paleari, and R. Lorenzi. "Nucleation-controlled vacancy formation in light-emitting wide-band-gap oxide nanocrystals in glass." Journal of Materials Chemistry C 3, no. 17 (2015): 4380–87. http://dx.doi.org/10.1039/c4tc02837f.

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Controlling nanocrystal nucleation in a solid host, as in the gallium-oxide nanophase grown in glass, provides a strategy for tailoring not only nanocrystal size but also light-emitting donor–acceptor population.

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14

Song, Myoung Geun, Jun Young Han, and Chung Wung Bark. "Effects of Doping Ratio of Cobalt and Iron on the Structure and Optical Properties of Bi3.25La0.75FexCo1–xTi2O12 (x = 0, 0.25, 0.5, 0.75, 1)." Journal of Nanoscience and Nanotechnology 15, no. 10 (October 1, 2015): 7841–44. http://dx.doi.org/10.1166/jnn.2015.11183.

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The wide band gap of complex oxides is one of the major obstacles limiting their use in photovoltaic cells. To identify an effective route for tailoring the band gap of complex oxides, this study examined the effects of cobalt and iron doping on lanthanum-modified Bi4Ti3O12-based oxides synthesized using a solid reaction. The structural and optical properties were analyzed by X-ray diffraction and ultraviolet-visible absorption spectroscopy. As a result, the optimal iron to cobalt doping ratio in bismuth titanate powder resulted in an ∼1.8 eV decrease in the optical band gap. This new route to reduce the optical bandgap can be adapted to the synthesis of other complex oxides.

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15

Al-Harthi, Salim, Mubarak Al-Saadi, Imad Al-Omari, Husein Sitepu, Khalid Melghit, Issa Al-Amri, Ashraf T. Al-Hinai, and Senoy Thomas. "Structural analysis and band gap tailoring of Fe3+-doped Zn–TiO2 nanoparticles." Applied Physics A 99, no. 1 (December 5, 2009): 237–44. http://dx.doi.org/10.1007/s00339-009-5508-4.

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16

Khalid, Muhammad, Saira Riaz, and Shahzad Naseem. "Tailoring of the Band Gap in Transition Metal-doped ZnO: First Principle Calculations." Materials Today: Proceedings 2, no. 10 (2015): 5246–50. http://dx.doi.org/10.1016/j.matpr.2015.11.030.

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17

Wessler, Garrett C., Tong Zhu, Jon-Paul Sun, Alexis Harrell, William P. Huhn, Volker Blum, and David B. Mitzi. "Band Gap Tailoring and Structure-Composition Relationship within the Alloyed Semiconductor Cu2BaGe1–xSnxSe4." Chemistry of Materials 30, no. 18 (August 28, 2018): 6566–74. http://dx.doi.org/10.1021/acs.chemmater.8b03380.

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18

Muralidharan, M., V. Anbarasu, A. Elaya Perumal, and K. Sivakumar. "Band gap tailoring and enhanced ferromagnetism in Yb doped SrWo4 scheelite structured system." Journal of Materials Science: Materials in Electronics 26, no. 9 (June 9, 2015): 6875–86. http://dx.doi.org/10.1007/s10854-015-3304-9.

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19

Murali, Banavoth, and S. B. Krupanidhi. "Tailoring the Band Gap and Transport Properties of Cu3BiS3 Nanopowders for Photodetector Applications." Journal of Nanoscience and Nanotechnology 13, no. 6 (June 1, 2013): 3901–9. http://dx.doi.org/10.1166/jnn.2013.7133.

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20

Polat, O., F. M. Coskun, M. Coskun, Z. Durmus, Y. Caglar, M. Caglar, and A. Turut. "Tailoring the band gap of ferroelectric YMnO3 through tuning the Os doping level." Journal of Materials Science: Materials in Electronics 30, no. 4 (January 2, 2019): 3443–51. http://dx.doi.org/10.1007/s10854-018-00619-9.

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21

Bhowmik, Dipak, Joy Mukherjee, and Prasanta Karmakar. "Projectile mass dependent nano patterning and optical band gap tailoring of muscovite mica." Radiation Physics and Chemistry 187 (October 2021): 109568. http://dx.doi.org/10.1016/j.radphyschem.2021.109568.

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22

Ali, Hafiz T., Jolly Jacob, Salma Ikram, Tariq Sikandar, K. Mahmood, Mohammad Yusuf, A. Ali, N. Amin, K. Javaid, and Fouad A. Abolaban. "Band gap tailoring of hydrothermally synthesized WS2 nanoparticles by the sulfurization time duration." Ceramics International 47, no. 18 (September 2021): 25381–86. http://dx.doi.org/10.1016/j.ceramint.2021.05.260.

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23

J., Fatima Rasheed, and V. Suresh Babu. "Investigations on Optical, Material and Electrical Properties of aSi:H and aSiGe:H in Making Proposed n+aSi:H/i-aSi:H/p+aSiGe:H Graded Bandgap Single-junction Solar Cell." Nanoscience & Nanotechnology-Asia 10, no. 5 (November 11, 2020): 709–18. http://dx.doi.org/10.2174/2210681209666190627152852.

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Objective: This work identifies materials that satisfy refractive index, optical band gap, composition profile, conductivity, hall mobility, carrier type and carrier concentration to utilize them in making thin film photovoltaic cells. Methods: We fabricated phosphorous doped amorphous silicon (n+ aSi:H), boron doped amorphous silicon germanium(p+ aSiGe:H) and intrinsic amorphous silicon (i-aSi:H). A detailed and systematic characterization of the fabricated layers was done. The phosphorous doped amorphous silicon (n+ aSi:H) showed an optical band gap of 1.842 eV and an electron mobility of 295.45 cm2V-1s-1. The boron doped amorphous silicon germanium (p+ aSiGe:H) exhibited an optical band gap of 1.74 eV and a hole mobility of 158.353 cm2V-1s-1. The intrinsic amorphous silicon (i-aSi:H) has an optical band gap of 1.801 eV. The films of n+ aSi:H, i-aSi:H and p+ aSiGe:H can be utilized for fabricating graded band gap single junction thin film solar cells, as they are semiconducting materials with varying band gaps in the range of 1.74 eV to 1.84 eV. The tailoring of band gap achieved by the proposed material combination has been presented using its energy band diagram. Results: In this work, we are proposing a single junction graded band gap solar cell with aSi:H and aSi- Ge:H alloys of varying doping to achieve grading of band gap, which improves the efficiency while keeping the cell compact and light. Conclusion: As a first step in the validation, we have simulated a thin film solar cell using SCAPS1D simulation software with the measured parameters for each of the layers and found that it successfully performs as solar cell with an efficiency of 14.5%.

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24

Gao, R. Z., G. Y. Zhang, T. Ioppolo, and X. L. Gao. "Elastic wave propagation in a periodic composite beam structure: A new model for band gaps incorporating surface energy, transverse shear and rotational inertia effects." Journal of Micromechanics and Molecular Physics 03, no. 03n04 (September 2018): 1840005. http://dx.doi.org/10.1142/s2424913018400052.

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A new model for determining band gaps for elastic wave propagation in a periodic composite beam structure is developed using a non-classical Timoshenko beam model that incorporates the surface energy, transverse shear and rotational inertia effects. The Bloch theorem and transfer matrix method for periodic structures are employed in the formulation. The new model reduces to the classical elasticity-based model when the surface energy effect is not considered. It is shown that the band gaps predicted by the current model depend on the surface elastic constants of each constituent material, beam thickness, unit cell size, and volume fraction. The numerical results reveal that the band gap based on the current non-classical model is always larger than that given by the classical model when the beam thickness is very small, but the difference is diminishing as the thickness becomes large. Also, it is found that the first frequency for producing the band gap and the band gap size decrease with the increase of the unit cell length according to both the current and classical models. In addition, it is observed that the volume fraction has a significant effect on the band gap size, and large band gaps can be obtained by tailoring the volume fraction and material parameters.

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25

Li, Jing, Baodan Liu, Wenjin Yang, Yujin Cho, Xinglai Zhang, Benjamin Dierre, Takashi Sekiguchi, Aimin Wu, and Xin Jiang. "Solubility and crystallographic facet tailoring of (GaN)1−x(ZnO)x pseudobinary solid-solution nanostructures as promising photocatalysts." Nanoscale 8, no. 6 (2016): 3694–703. http://dx.doi.org/10.1039/c5nr08663a.

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(GaN)_1−x(ZnO)_x solid solution nanorods with tunable crystallographic facets and controllable band-gaps are obtained and the ZnO solubility plays a key role in governing the morphology evolution and band-gap engineering.

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26

Sangeetha, R., and S. Muthukumaran. "Band gap tailoring and enhanced visible emission by two-step annealing in Zn0.94Cu0.04Cr0.02O nanocrystals." Journal of Materials Science: Materials in Electronics 26, no. 12 (August 15, 2015): 9667–79. http://dx.doi.org/10.1007/s10854-015-3634-7.

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27

Shanid, N. A. Mohemmed, and M. Abdul Khadar. "Evolution of nanostructure, phase transition and band gap tailoring in oxidized Cu thin films." Thin Solid Films 516, no. 18 (July 2008): 6245–52. http://dx.doi.org/10.1016/j.tsf.2007.11.119.

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28

Li, Weiwei, Ruiping Qin, Yi Zhou, Mattias Andersson, Fenghong Li, Chi Zhang, Binsong Li, Zhengping Liu, Zhishan Bo, and Fengling Zhang. "Tailoring side chains of low band gap polymers for high efficiency polymer solar cells." Polymer 51, no. 14 (June 2010): 3031–38. http://dx.doi.org/10.1016/j.polymer.2010.05.015.

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29

Jang, Jum Suk, Pramod H. Borse, Jae Sung Lee, Sun Hee Choi, and Hyun Gyu Kim. "Indium induced band gap tailoring in AgGa1−xInxS2 chalcopyrite structure for visible light photocatalysis." Journal of Chemical Physics 128, no. 15 (April 21, 2008): 154717. http://dx.doi.org/10.1063/1.2900984.

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30

Badawi, Ali, Alia Hendi Al Otaibi, Ateyyah M. Albaradi, N. Al-Hosiny, and Sultan E. Alomairy. "Tailoring the energy band gap of alloyed Pb1−xZnxS quantum dots for photovoltaic applications." Journal of Materials Science: Materials in Electronics 29, no. 24 (October 19, 2018): 20914–22. http://dx.doi.org/10.1007/s10854-018-0235-2.

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31

Kumar, Promod, Mohan Chandra Mathpal, Jai Prakash, Bennie C. Viljoen, W. D. Roos, and H. C. Swart. "Band gap tailoring of cauliflower-shaped CuO nanostructures by Zn doping for antibacterial applications." Journal of Alloys and Compounds 832 (August 2020): 154968. http://dx.doi.org/10.1016/j.jallcom.2020.154968.

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32

Tyona, Mrumun David, R. U. Osuji, P. U. Asogwa, S. B. Jambure, and F. I. Ezema. "Structural modification and band gap tailoring of zinc oxide thin films using copper impurities." Journal of Solid State Electrochemistry 21, no. 9 (March 17, 2017): 2629–38. http://dx.doi.org/10.1007/s10008-017-3533-3.

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33

Sakthivel, P., K. Kavi Rasu, A. Sivakami, P. Muthukrishnan, and G. K. D. Prasanna Venkatesan. "Band gap tailoring, structural and optical features of MgS nanoparticles: Influence of Ag+ ions." Optik 236 (June 2021): 166544. http://dx.doi.org/10.1016/j.ijleo.2021.166544.

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34

Goyal, Alisha, Jyoti Rozra, Isha Saini, Pawan K. Sharma, and Annu Sharma. "Refractive Index Tailoring of Poly(methylmethacrylate) Thin Films by Embedding Silver Nanoparticles." Advanced Materials Research 585 (November 2012): 134–38. http://dx.doi.org/10.4028/www.scientific.net/amr.585.134.

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Nanocomposite films of Poly (methylmethacrylate) with different concentration of silver nanoparticles were prepared by ex-situ method. Firstly, silver nanoparticles were obtained by reducing the aqueous solution of silver nitrate with sodium borohydride then Ag-PMMA films were prepared by mixing colloidal solution of silver nanoparticles with solution of polymer. Thin solid films were structurally characterized using UV-VIS spectroscopy and TEM. The appearance of surface plasmon resonance peak, characteristic of silver nanoparticles at 420 nm in UV-VIS absorption spectra of Ag-PMMA films confirms the formation of Ag-PMMA nanocomposite. TEM showed Ag nanoparticles of average size 8 nm embedded in PMMA matrix. Analysis of absorption and reflection data indicates towards the reduction in optical band gap and increase in refractive index of the resulting nanocomposite. The synthesized Ag-PMMA nanocomposite has been found to be more conducting than PMMA as ascertained using I-V studies. The decrease in band gap and increase in conductivity can be correlated due to the formation of localized electronic states in PMMA matrix due to insertion of Ag nanoparticles. The PMMA thin films with dispersed silver nanoparticles may be useful for nanophotonic devices.

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35

Cao, Hai Ning, Zhi Ya Zhang, Ming Su Si, Feng Zhang, and Yu Hua Wang. "Indirect-Direct Band Gap Transition by Van Der Waals Interaction Engineering in MoS₂/WS₂ Bilayer Heterojunction." Applied Mechanics and Materials 614 (September 2014): 70–74. http://dx.doi.org/10.4028/www.scientific.net/amm.614.70.

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First principles calculations based on the density functional theory (DFT) are employed to estimate the electronic structures of bilayer heterostructure of MoS2/WS2. The dependences of the band structures on external electric field and interlayer separation are evaluated. The external electric filed induces a semiconductor-metal transition. At the same time, a larger interlayer separation, corresponding to a weaker interlayer interaction, makes an indirect-direct band gap transition happen for the heterojunction. Our results demonstrate that electronic structure tailoring of two-dimensional layered materials should include both spatial symmetry control and interlayer vdW interactions engineering.

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36

Ganose, Alex M., and David O. Scanlon. "Band gap and work function tailoring of SnO2 for improved transparent conducting ability in photovoltaics." Journal of Materials Chemistry C 4, no. 7 (2016): 1467–75. http://dx.doi.org/10.1039/c5tc04089b.

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Alloying of PbO₂ with SnO₂ results in a material with a tuneable band gap, larger electron affinity and smaller electron effective mass, whilst maintaining high levels of optical transparency. These properties are expected to give rise to a more efficient transparent conducting oxide for use in photovoltaic applications.

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37

Misra, Ramprasad, Pushkin Chakraborty, Subhas C. Roy, D. K. Maity, and S. P. Bhattacharyya. "Tailoring of spectral response and intramolecular charge transfer in β-enaminones through band gap tuning: synthesis, spectroscopy and quantum chemical studies." RSC Advances 6, no. 43 (2016): 36811–22. http://dx.doi.org/10.1039/c6ra00376a.

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38

Chandrasekhar, D., David J. Smith, and J. Kouvetakis. "Characterization of Sil-ycy Alloy Layers Incorporating Si4c Building Blocks." Microscopy and Microanalysis 3, S2 (August 1997): 457–58. http://dx.doi.org/10.1017/s143192760000917x.

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Group IV based alloys have received considerable attention in recent years, because of the possibility to tailor the band gap of the material system with respect to that of Si. Significant results have already been achieved with Si-Ge system, where the band gap of pseudomorphic Si1-xGex alloys is smaller than that of Si. Introduction of C onto substitutional lattice sites in Si has been proposed as a possible alternate method for tailoring the electronic properties of Si. Carbon incorporation into Si substitutionally could result in alloys whose band gap would be a function of carbon concentration and lie between the values for silicon (E =1.1 eV) and β-SiC (Eg = 2.3 eV). However, due to the low-equilibrium solubility limit of C in Si, 3.5x1017cm−3 at the eutectic temperature, highly supersaturated and metastable layers are essential to significantly alter strain and electrical properties of the alloys.In our present study, we have synthesized and characterized Si1-yCy (0.04 < y < 0.20) films grown on (001) Si substrates by ultra-high vacuum chemical vapor deposition at 625°C.

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39

Prabhash, P. G., and Swapna S. Nair. "Synthesis of copper quantum dots by chemical reduction method and tailoring of its band gap." AIP Advances 6, no. 5 (May 2016): 055003. http://dx.doi.org/10.1063/1.4948747.

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40

Hone, Fekadu Gashaw, F. B. Dejene, and O. K. Echendu. "Band gap tailoring of chemically synthesized lead sulfide thin films by in situ Sn doping." Surface and Interface Analysis 50, no. 6 (May 10, 2018): 648–56. http://dx.doi.org/10.1002/sia.6454.

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41

Chen, Qian, Hong Hu, Xiaojie Chen, and Jinlan Wang. "Tailoring band gap in GaN sheet by chemical modification and electric field: Ab initio calculations." Applied Physics Letters 98, no. 5 (January 31, 2011): 053102. http://dx.doi.org/10.1063/1.3549299.

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42

Peymanfar, Reza, Elnaz Selseleh-Zakerin, and Ali Ahmadi. "Tailoring energy band gap and microwave absorbing features of graphite-like carbon nitride (g-C3N4)." Journal of Alloys and Compounds 867 (June 2021): 159039. http://dx.doi.org/10.1016/j.jallcom.2021.159039.

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43

Santhaveesuk, Theerapong, Yoottana Keawtoakrue, Kwunta Siwawongkasem, and Supab Choopun. "Size and Shape Tailoring of ZnO Nanoparticles." Key Engineering Materials 675-676 (January 2016): 61–64. http://dx.doi.org/10.4028/www.scientific.net/kem.675-676.61.

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ZnO nanoparticles were successfully synthesized via the co-precipitation method using zinc nitrate and sodium hydroxide as raw materials. Size and shape of ZnO nanoparticles were well controlled by varying the ratio of sodium hydroxide solutions (0.5-0.9 mole) and the synthesized temperatures (65, 75 and 85 °C). ZnO nanoparticles exhibited a high degree crystallinity with wurtzite hexagonal structure for all conditions carried out using SEM, XRD, EDS and Raman. It was clearly observed that both sodium hydroxide solution and synthesized temperatures strongly affected on the size and shape of ZnO nanoparticles. The smallest ZnO nanoparticle was observed to be 47 nm with 0.7 mole of sodium hydroxide solution at 75 °C. Uniformed ZnO nanoparticles were obtained at synthesized temperatures above 65 °C. Optical properties of ZnO nanoparticles were also studied and carried out as absorbance spectra. In addition, optical energy band gap of ZnO nanoparticles was in the range of 3.24-3.35 eV.

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44

Khajuria, R., A. Sharma, and P. Sharma. "Effect of Sn Incorporation on Physical Parameters of Sb-Se Glassy System." Journal of Scientific Research 12, no. 4 (September 1, 2020): 545–54. http://dx.doi.org/10.3329/jsr.v12i4.46048.

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The rationale of this study is to investigate band gap tailoring of Sb-Se-Sn chalcogenide glasses. This study has been accompanied by the assessment of various theoretical parameters such as average co-ordination number, Lone-pair of electrons, number of constraints, average heat of atomization, mean bond energy and glass transition temperature. It has been observed that almost all these physical parameters have been enhanced with the increase in tin (Sn) content except Lone-pair of electrons. The number of lone-pair electrons has been decreased with the increase in Sn content. The glass transition temperature has been observed to increase due to the addition of Sn atom in the Se-Sb glassy system. The band gap is decreasing with increase in Sn content due to overall decrease in the average single bond energy of the Sb-Se-Sn glassy system.

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45

Asha, S., Y. Sangappa, and Sanjeev Ganesh. "Tuning the Refractive Index and Optical Band Gap of Silk Fibroin Films by Electron Irradiation." Journal of Spectroscopy 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/879296.

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TheBombyx morisilk fibroin (SF) films were prepared by solution casting method and effects of electron beam on the optical properties and optical constants of the films have been studied by using UV-Visible spectrophotometer. Optical properties like optical band gapEg, refractive indexn, extinction coefficientk, optical conductivityσopt, and dielectric constantsε∗of virgin and electron irradiated films were determined by using UV-Visible absorption and transmission spectra. It was found that the reduction in optical band gap and increase in refractive index with increasing radiation dosage was observed. It is also observed from results that there is increase in dielectric constants with increasing photon energy. The observed optical changes have been tried to be correlated with the structural changes, revealed through FT-IR spectroscopy. The present study is quite important for tailoring the optical responses of SF films as per specific requirements.

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46

BARUAH, SUNANDAN, RAHMAN FAIZUR RAFIQUE, and JOYDEEP DUTTA. "VISIBLE LIGHT PHOTOCATALYSIS BY TAILORING CRYSTAL DEFECTS IN ZINC OXIDE NANOSTRUCTURES." Nano 03, no. 05 (October 2008): 399–407. http://dx.doi.org/10.1142/s179329200800126x.

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The photocatalytic activity of zinc oxide ( ZnO ) nanoparticles, films and nanowires as a potential visible light photocatalyst is presented in this work. ZnO nanoparticles were synthesized in different alcoholic solvents. Crystal defects were introduced either by doping the crystallites with manganese or by fast crystallization (using microwave irradiation during synthesis). ZnO , with a band gap of 3.37 eV, normally absorbs electromagnetic waves in the ultraviolet region, but introducing defects into its crystal lattice can shift the absorption more toward the visible light band from 400 nm to 700 nm by creating intermediate states which inhibit electron–hole recombination. The undoped ZnO nanoparticles synthesized using microwaves showed comparable photocatalytic activities to the doped samples using the conventional heating method. To increase the effective surface area of the photocatalyst, ZnO nanowires were grown by a solution-based technique. Methylene blue degradation was observed to be enhanced in the presence of the ZnO nanowires compared to the ZnO nanoparticles. Intentional defect creation in photocatalysts could be an attractive possibility to apply in the visible light photocatalytic degradation studies.

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Hassanabadi, Ehsan, Masoud Latifi, Andrés F. Gualdrón-Reyes, Sofia Masi, Seog Joon Yoon, Macarena Poyatos, Beatriz Julián-López, and Iván Mora-Seró. "Ligand & band gap engineering: tailoring the protocol synthesis for achieving high-quality CsPbI3 quantum dots." Nanoscale 12, no. 26 (2020): 14194–203. http://dx.doi.org/10.1039/d0nr03180a.

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48

Wu, Aimin, Jing Li, Baodan Liu, Wenjin Yang, Yanan Jiang, Lusheng Liu, Xinglai Zhang, Changmin Xiong, and Xin Jiang. "Band-gap tailoring and visible-light-driven photocatalytic performance of porous (GaN)1−x(ZnO)x solid solution." Dalton Transactions 46, no. 8 (2017): 2643–52. http://dx.doi.org/10.1039/c6dt04428j.

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(GaN)_1−x(ZnO)_x solid solution photocatalysts with tunable band-gaps have been synthesized and exhibited superior photocatalytic performance on phenol degradation after Ag decoration under visible light.

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Kushwaha, Manvir S. "The phononic crystals: An unending quest for tailoring acoustics." Modern Physics Letters B 30, no. 19 (July 20, 2016): 1630004. http://dx.doi.org/10.1142/s0217984916300040.

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Periodicity (in time or space) is a part and parcel of every living being: one can see, hear and feel it. Everyday examples are locomotion, respiration and heart beat. The reinforced N-dimensional periodicity over two or more crystalline solids results in the so-called phononic band gap crystals. These can have dramatic consequences on the propagation of phonons, vibrations and sound. The fundamental physics of cleverly fabricated phononic crystals can offer a systematic route to realize the Anderson localization of sound and vibrations. As to the applications, the phononic crystals are envisaged to find ways in the architecture, acoustic waveguides, designing transducers, elastic/acoustic filters, noise control, ultrasonics, medical imaging and acoustic cloaking, to mention a few. This review focuses on the brief sketch of the progress made in the field that seems to have prospered even more than was originally imagined in the early nineties.

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Dilonardo, Elena, Maria M. Giangregorio, Maria Losurdo, Pio Capezzuto, Giovanni Bruno, Antonio Cardone, Carmela Martinelli, Gianluca M. Farinola, Francesco Babudri, and Francesco Naso. "Tailoring Optical Properties of Blue-Gap Poly(p-phenylene Vinylene)s for LEDs Applications." Advances in Science and Technology 75 (October 2010): 118–23. http://dx.doi.org/10.4028/www.scientific.net/ast.75.118.

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There has been growing interest in developing new semiconducting polymers for applications in optoelectronics (OLEDs) due to their exceptional processability and appealing characteristic of manipulating electronic and optical properties by tuning of molecular structure and self-assembling. This study is an investigation on the interplay among supermolecular organization and optical properties of thin films of the poly[2-(2-ethylhexyloxy)-5-methoxy]-1, 4-phenylenedifluorovinylene (MEH-PPDFV) conjugated polymer, which has fluorinated vinylene units. This interplay is elucidated exploiting atomic force microscopy, spectroscopy ellipsometry, photoluminescence and electroluminescence. Thin films of MEH-PPDFV have been deposited by drop casting on indium-tin-oxide (ITO), quartz and glass substrates. The dependence of polymer chains self-organization and morphology on substrate surface is presented. Furthermore, it is demonstrated that the presence of F-atoms in the vinylene units of the MEH-PPDFV yields a blue optical band gap with the maximum of the fundamental HOMO-LUMO transition at 331 nm and photoluminescence at 458 nm. The OLED built with the above polymer shows a very stable blue-greenish electroluminescence that is also achieved at 504 nm.

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