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Articles de revues sur le sujet « Bi2Te3 NANOCOMPOSITES »

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Auteur : Grafiati
Publié le 11 septembre 2023

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1

Wang, Yanan, Cédric Bourgès, Ralph Rajamathi, C. Nethravathi, Michael Rajamathi et Takao Mori. « The Effect of Reactive Electric Field-Assisted Sintering of MoS2/Bi2Te3 Heterostructure on the Phase Integrity of Bi2Te3 Matrix and the Thermoelectric Properties ». Materials 15, no 1 (22 décembre 2021) : 53. http://dx.doi.org/10.3390/ma15010053.

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In this work, a series of Bi2Te3/X mol% MoS2 (X = 0, 25, 50, 75) bulk nanocomposites were prepared by hydrothermal reaction followed by reactive spark plasma sintering (SPS). X-ray diffraction analysis (XRD) indicates that the native nanopowders, comprising of Bi2Te3/MoS2 heterostructure, are highly reactive during the electric field-assisted sintering by SPS. The nano-sized MoS2 particles react with the Bi2Te3 plates matrix forming a mixed-anion compound, Bi2Te2S, at the interface between the nanoplates. The transport properties characterizations revealed a significant influence of the nanocomposite structure formation on the native electrical conductivity, Seebeck coefficient, and thermal conductivity of the initial Bi2Te3 matrix. As a result, enhanced ZT values have been obtained in Bi2Te3/25 mol% MoS2 over the temperature range of 300–475 K induced mainly by a significant increase in the electrical conductivity.
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2

Zhmurova, Anna V., Galina F. Prozorova et Marina V. Zvereva. « Mechanochemical Synthesis and DC Electrical Conductivity of PANI-Based MWCNT Containing Nanocomposites with Te0 and Bi2Te3 Thermoelectric Nanophase ». Powders 2, no 3 (14 juillet 2023) : 540–61. http://dx.doi.org/10.3390/powders2030034.

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Nowadays, the search for the coupled polymer nanocomposite thermoelectrics that exhibit a high value of thermoelectric figure of merit (ZT) and similar behaviour of physical properties for the use as legs of thermoelectric cells is a current challenge. The direct current (DC) conductivity is one of the three important components of thermoelectric figure of merit. The aim of this study was to obtain PANI-based nanothermoelectrics with Te0 and Bi2Te3 nanoparticles and MWCNT by mechanochemical methodology and to investigate the dependency of their DC electrical conductivity on temperature in the 298–353 K range using the Arrhenius and Mott’s variable range hopping (VRH) models. Inorganic Te0 and Bi2Te3 nanoparticles were pre-synthesized by the available and environmentally friendly method using a commercial tellurium powder. The samples obtained were characterized by X-ray diffractometry (XRD), IR and UV-Vis spectroscopy. The XRD study of ES-PANI/Te0 (4.4 wt% Te0) and ES-PANI/Bi2Te3 (2.9 wt% Bi2Te3) nanocomposites found that the nanoparticle average size was 32 nm and 17 nm, respectively. The DC conductivity study of the samples with different nanophase content (2.1, 4.4, 10.2 wt% Te0, 1.5, 2.9, 7.3 wt% Bi2Te3, 1.5 wt% MWCNT) by the two points measurement method reveals the following: (a) the presence of inorganic nanophase reduces the conductivity compared to the matrix, (b) the addition of MWCNT in ES-PANI increases its electrical conductivity, (c) the conductivity of ES-PANI/Te0 as well as ES-PANI/Bi2Te3 nanocomposite rises with the increasing inorganic nanophase content, (d) the observed increase in the electrical conductivity of MWCNT-based nanocomposites with increasing inorganic nanophase content is interrupted by a characteristic area of decrease in its value at average values of inorganic nanoparticles content (at Te0 content of 4.4 wt%, at Bi2Te3 content of 2.9 wt%), (e) a similar DC conductivity behaviour in ES-PANI/Te0—ES-PANI/Bi2Te3 and ES-PANI/Te0-MWCNT—ES-PANI/Bi2Te3-MWCNT nanocomposite pairs is observed.
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Wu, Di, Jun Guo, Zhen-Hua Ge et Jing Feng. « Facile Synthesis Bi2Te3 Based Nanocomposites : Strategies for Enhancing Charge Carrier Separation to Improve Photocatalytic Activity ». Nanomaterials 11, no 12 (14 décembre 2021) : 3390. http://dx.doi.org/10.3390/nano11123390.

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Varying structure Bi2Te3-based nanocomposite powders including pure Bi2Te3, Bi2Te3/Bi core−shell, and Bi2Te3/AgBiTe2 heterostructure were synthesized by hydrothermal synthesis using Bi2S3 as the template and hydrazine as the reductant. Successful realization of Bi2Te3-based nanostructures were concluded from XRD, FESEM, and TEM. In this work, the improvement in the performance of the rhodamine B (RhB) decomposition efficiency under visible light was discussed. The Bi2Te3/AgBiTe2 heterostructures revealed propitious photocatalytic performance ca. 90% after 60 min. The performance was over Bi2Te3/Bi core-shell nanostructures (ca. 40%) and more, exceeding pure Bi2Te3 (ca. 5%). The reason could be scrutinized in terms of the heterojunction structure, improving the interfacial contact between Bi2Te3 and AgBiTe2 and enabling retardation in the recombination rate of the photogenerated charge carriers. A credible mechanism of the charge transfer process in the Bi2Te3/AgBiTe2 heterostructures for the decomposition of an aqueous solution of RhB was also explicated. In addition, this work also investigated the stability and recyclability of a Bi2Te3/AgBiTe2 heterojunction nanostructure photocatalyst. In addition, this paper anticipates that the results possess broad potential in the photocatalysis field for the design of a visible light functional and reusable heterojunction nanostructure photocatalyst.
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4

Kulbashinskii, V. A., V. G. Kytin, N. V. Maslov, P. Singha, Subarna Das, A. K. Deb et A. Banerjee. « Thermoelectrical properties of Bi2Te3 nanocomposites ». Materials Today : Proceedings 8 (2019) : 573–81. http://dx.doi.org/10.1016/j.matpr.2019.02.056.

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5

Du, Yong, Jia Li, Jiayue Xu et Per Eklund. « Thermoelectric Properties of Reduced Graphene Oxide/Bi2Te3 Nanocomposites ». Energies 12, no 12 (24 juin 2019) : 2430. http://dx.doi.org/10.3390/en12122430.

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Reduced graphene oxide (rGO)/Bi2Te3 nanocomposite powders with different contents of rGO have been synthesized by a one-step in-situ reductive method. Then, rGO/Bi2Te3 nanocomposite bulk materials were fabricated by a hot-pressing process. The effect of rGO contents on the composition, microstructure, TE properties, and carrier transportation of the nanocomposite bulk materials has been investigated. All the composite bulk materials show negative Seebeck coefficient, indicating n-type conduction. The electrical conductivity for all the rGO/Bi2Te3 nanocomposite bulk materials decreased with increasing measurement temperature from 25 °C to 300 °C, while the absolute value of Seebeck coefficient first increased and then decreased. As a result, the power factor of the bulk materials first increased and then decreased, and a power factor of 1340 μWm−1K−2 was achieved for the nanocomposite bulk materials with 0.25 wt% rGO at 150 °C.
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Hu, J. Z., X. B. Zhao, T. J. Zhu et A. J. Zhou. « Synthesis and transport properties of Bi2Te3 nanocomposites ». Physica Scripta T129 (26 novembre 2007) : 120–22. http://dx.doi.org/10.1088/0031-8949/2007/t129/027.

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7

Hsin, Cheng-Lun, et Yue-Yun Tsai. « Power conversion of hybrid Bi2Te3/si thermoelectric nanocomposites ». Nano Energy 11 (janvier 2015) : 647–53. http://dx.doi.org/10.1016/j.nanoen.2014.11.053.

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8

Tang, Gui, Kefeng Cai, Jiaolin Cui, Junlin Yin et Shirley Shen. « Preparation and thermoelectric properties of MoS2/Bi2Te3 nanocomposites ». Ceramics International 42, no 16 (décembre 2016) : 17972–77. http://dx.doi.org/10.1016/j.ceramint.2016.07.083.

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9

Ahmad, Kaleem, C. Wan, M. A. Al-Eshaikh et A. N. Kadachi. « Enhanced thermoelectric performance of Bi2Te3 based graphene nanocomposites ». Applied Surface Science 474 (avril 2019) : 2–8. http://dx.doi.org/10.1016/j.apsusc.2018.10.163.

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10

Peng, Jiangying, Jin Zheng, Fanhao Shen, Kuo Zhang, Jian He, Jinsong Zeng, Wanli Xiao et Bing An. « High temperature thermoelectric properties of skutterudite-Bi2Te3 nanocomposites ». Intermetallics 76 (septembre 2016) : 33–40. http://dx.doi.org/10.1016/j.intermet.2016.06.007.

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11

Ni, H. L., X. B. Zhao, T. J. Zhu, X. H. Ji et J. P. Tu. « Synthesis and thermoelectric properties of Bi2Te3 based nanocomposites ». Journal of Alloys and Compounds 397, no 1-2 (juillet 2005) : 317–21. http://dx.doi.org/10.1016/j.jallcom.2005.01.046.

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12

Xu, Han, et Wei Wang. « Synthesis and Characterization of CNTs/Bi2Te3 Thermoelectric Nanocomposites ». International Journal of Electrochemical Science 8, no 5 (mai 2013) : 6686–91. http://dx.doi.org/10.1016/s1452-3981(23)14796-1.

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13

Zhang, Yi-Xin, Yu-Ke Zhu, Dong-Sheng Song, Jing Feng et Zhen-Hua Ge. « Excellent thermoelectric performance achieved in Bi2Te3/Bi2S3@Bi nanocomposites ». Chemical Communications 57, no 20 (2021) : 2555–58. http://dx.doi.org/10.1039/d1cc00119a.

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14

Kim, HeeJin, Mi-Kyung Han, Chul-Hyun Yo, Wooyoung Lee et Sung-Jin Kim. « Effects of Bi2Se3 Nanoparticle Inclusions on the Microstructure and Thermoelectric Properties of Bi2Te3-Based Nanocomposites ». Journal of Electronic Materials 41, no 12 (29 septembre 2012) : 3411–16. http://dx.doi.org/10.1007/s11664-012-2255-7.

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15

Gothard, N., X. Ji, J. He et Terry M. Tritt. « Thermoelectric and transport properties of n-type Bi2Te3 nanocomposites ». Journal of Applied Physics 103, no 5 (mars 2008) : 054314. http://dx.doi.org/10.1063/1.2871923.

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Tian, Zi-Han, Hai-Hui Liu, Ning Wang, Yan-Xin Liu et Xing-Xiang Zhang. « Facile preparation and thermoelectric properties of PEDOT nanowires/Bi2Te3 nanocomposites ». Journal of Materials Science : Materials in Electronics 29, no 20 (20 août 2018) : 17367–73. http://dx.doi.org/10.1007/s10854-018-9834-1.

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17

Lee, Eunsil, Jieun Ko, Jong-Young Kim, Won-Seon Seo, Soon-Mok Choi, Kyu Hyoung Lee, Wooyoung Shim et Wooyoung Lee. « Enhanced thermoelectric properties of Au nanodot-included Bi2Te3 nanotube composites ». Journal of Materials Chemistry C 4, no 6 (2016) : 1313–19. http://dx.doi.org/10.1039/c5tc03934g.

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Herein, we report on a scalable synthesis of Au nanodot (Au-ND)/Bi2Te3 nanotube (BT-NT) nanocomposites by the bottom-up synthesis of hybrid raw materials and subsequent spark plasma sintering, and their thermoelectric properties were systematically compared with those of Au-doped Bi2Te3 compounds.
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18

Fan, Shufen, Junnan Zhao, Qingyu Yan, Jan Ma et Huey Hoon Hng. « Influence of Nanoinclusions on Thermoelectric Properties of n-Type Bi2Te3 Nanocomposites ». Journal of Electronic Materials 40, no 5 (6 janvier 2011) : 1018–23. http://dx.doi.org/10.1007/s11664-010-1487-7.

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19

Mei, Zhi-Yuan, Jun Guo, Yi Wu, Jing Feng et Zhen-Hua Ge. « Shashlik-like Te–Bi2Te3 hetero-nanostructures : one-pot synthesis, growth mechanism and their thermoelectric properties ». CrystEngComm 21, no 24 (2019) : 3694–701. http://dx.doi.org/10.1039/c9ce00441f.

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Cao, Y. Q., X. B. Zhao, T. J. Zhu, X. B. Zhang et J. P. Tu. « Syntheses and thermoelectric properties of Bi2Te3∕Sb2Te3 bulk nanocomposites with laminated nanostructure ». Applied Physics Letters 92, no 14 (7 avril 2008) : 143106. http://dx.doi.org/10.1063/1.2900960.

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Ketharachapalli, Balaji, et Raj Kishora Dash. « Simple approach to synthesize CNTs uniformly coated Bi2Te3 nanocomposites by mechanical alloying ». Applied Nanoscience 8, no 8 (3 septembre 2018) : 1887–93. http://dx.doi.org/10.1007/s13204-018-0867-9.

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Fan, X. A., G. Q. Li, W. Zhong, X. K. Duan et J. Y. Yang. « Effect of Nanopowders Addition on the Thermoelectric Properties of n-Type Bi2Te3 Nanocomposites ». Integrated Ferroelectrics 128, no 1 (janvier 2011) : 1–7. http://dx.doi.org/10.1080/10584587.2011.576164.

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Xie, Wenjie, Shanyu Wang, Song Zhu, Jian He, Xinfeng Tang, Qingjie Zhang et Terry M. Tritt. « High performance Bi2Te3 nanocomposites prepared by single-element-melt-spinning spark-plasma sintering ». Journal of Materials Science 48, no 7 (22 septembre 2012) : 2745–60. http://dx.doi.org/10.1007/s10853-012-6895-z.

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24

Zhang, Qihao, Xin Ai, Weijie Wang, Lianjun Wang et Wan Jiang. « Preparation of 1-D/3-D structured AgNWs/Bi2Te3 nanocomposites with enhanced thermoelectric properties ». Acta Materialia 73 (juillet 2014) : 37–47. http://dx.doi.org/10.1016/j.actamat.2014.03.070.

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Lu, Xiaofang, Qi Zheng, Shijia Gu, Rui Guo, Li Su, Jiancheng Wang, Zhenxing Zhou, Yuchi Fan, Wan Jiang et Lianjun Wang. « Enhanced TE properties of Cu@Ag/Bi2Te3 nanocomposites by decoupling electrical and thermal properties ». Chinese Chemical Letters 31, no 3 (mars 2020) : 880–84. http://dx.doi.org/10.1016/j.cclet.2019.07.034.

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Shyni, P., et P. P. Pradyumnan. « Tuned Fermi Level and Improved Thermoelectric Performance in Bi2Te3 Nanocomposites Reinforced with g-C3N4 Nanosheets ». ECS Journal of Solid State Science and Technology 10, no 7 (1 juillet 2021) : 071017. http://dx.doi.org/10.1149/2162-8777/ac147f.

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Lin, Fei-Hung, et Chia-Jyi Liu. « A simple energy-saving aqueous synthesis of Bi2Te3 nanocomposites yielding relatively high thermoelectric power factors ». Ceramics International 45, no 7 (mai 2019) : 9397–400. http://dx.doi.org/10.1016/j.ceramint.2018.08.170.

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28

Zhang, Chaohua, Chunxiao Zhang, Hongkuan Ng et Qihua Xiong. « Solution-processed n-type Bi2Te3−xSex nanocomposites with enhanced thermoelectric performance via liquid-phase sintering ». Science China Materials 62, no 3 (20 juillet 2018) : 389–98. http://dx.doi.org/10.1007/s40843-018-9312-5.

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29

Feng, Zunpeng, Yanan Hao, Jiameng Zhang, Jing Qin, Limin Guo et Ke Bi. « Dielectric Properties of Two-Dimensional Bi2Se3 Hexagonal Nanoplates Modified PVDF Nanocomposites ». Advances in Polymer Technology 2019 (3 juillet 2019) : 1–8. http://dx.doi.org/10.1155/2019/8720678.

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Topological insulator two-dimensional (2D) Bi2Se3 hexagonal nanoplates, which are highly insulating in the bulk and have a conductive topological surface state, have been prepared via an “EG- (ethylene glycol-) sol” method and characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and scanning electron microscopy (SEM). Bi2Se3/PVDF (polyvinylidene fluoride) nanocomposites with various Bi2Se3 contents have been fabricated by a tape-casting method. The microstructure and dielectric performance of the Bi2Se3/PVDF nanocomposites are studied. The dielectric constant of the dense nanocomposite films keeps a relatively low value of about 16 when the Bi2Se3 content is lower than 12 vol.% then suddenly increases to 36 with a critical Bi2Se3 content of 13 vol.% due to the percolation effect of the large aspect ratio of the 2D Bi2Se3 nanoplates. The study of the Bi2Se3/PVDF nanocomposite system is conducive to the exploration of high-performance dielectrics.
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Shalaby, M. S., N. M. Yousif, L. A. Wahab et H. M. Hashem. « Structural, optical, and physical properties investigations of Bi2Te3 topological insulator nanocomposites exposure to 60Co γ-rays ». Materials Science and Engineering : B 271 (septembre 2021) : 115246. http://dx.doi.org/10.1016/j.mseb.2021.115246.

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Chen, Jianwen, Xiucai Wang, Xinmei Yu, Yun Fan, Zhikui Duan, Yewen Jiang, Faquan Yang et Yuexia Zhou. « Significantly improved dielectric performances of nanocomposites via loading two-dimensional core-shell structure Bi2Te3@SiO2 nanosheets ». Applied Surface Science 447 (juillet 2018) : 704–10. http://dx.doi.org/10.1016/j.apsusc.2018.04.009.

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Li, Peigen, Jigui Shi, Xuelian Wu, Junqin Li, Lipeng Hu, Fusheng Liu, Yu Li, Weiqin Ao et Chaohua Zhang. « Interfacial engineering of solution-processed Bi2Te3-based thermoelectric nanocomposites via graphene addition and liquid-phase-sintering process ». Chemical Engineering Journal 440 (juillet 2022) : 135882. http://dx.doi.org/10.1016/j.cej.2022.135882.

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Fang, Haiyu, Je-Hyeong Bahk, Tianli Feng, Zhe Cheng, Amr M. S. Mohammed, Xinwei Wang, Xiulin Ruan, Ali Shakouri et Yue Wu. « Thermoelectric properties of solution-synthesized n-type Bi2Te3 nanocomposites modulated by Se : An experimental and theoretical study ». Nano Research 9, no 1 (29 octobre 2015) : 117–27. http://dx.doi.org/10.1007/s12274-015-0892-x.

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Agarwal, Khushboo, Vishakha Kaushik, Deepak Varandani, Ajay Dhar et B. R. Mehta. « Nanoscale thermoelectric properties of Bi2Te3 – Graphene nanocomposites : Conducting atomic force, scanning thermal and kelvin probe microscopy studies ». Journal of Alloys and Compounds 681 (octobre 2016) : 394–401. http://dx.doi.org/10.1016/j.jallcom.2016.04.161.

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Chen, Jianwen, Xiucai Wang, Xinmei Yu, Lingmin Yao, Zhikui Duan, Yun Fan, Yewen Jiang, Yuexia Zhou et Zhongbin Pan. « High dielectric constant and low dielectric loss poly(vinylidene fluoride) nanocomposites via a small loading of two-dimensional Bi2Te3@Al2O3 hexagonal nanoplates ». Journal of Materials Chemistry C 6, no 2 (2018) : 271–79. http://dx.doi.org/10.1039/c7tc04758d.

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Nanocomposite films with a small loading of two-dimensional Bi2Te3@Al2O3 hexagonal nanoplates exhibit a high dielectric constant of 140 and relatively low dielectric loss of 0.05 at 1 kHz.
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Jabar, Bushra, Xiaoying Qin, Di Li, Jian Zhang, Adil Mansoor, Hongxing Xin, Chunjun Song et Lulu Huang. « Achieving high thermoelectric performance through constructing coherent interfaces and building interface potential barriers in n-type Bi2Te3/Bi2Te2.7Se0.3 nanocomposites ». Journal of Materials Chemistry A 7, no 32 (2019) : 19120–29. http://dx.doi.org/10.1039/c9ta05798f.

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Through incorporation of isostructural Bi2Te3 nanoinclusions in n-type Bi2Te2.7Se0.3 we achieve unprecedented energy-conversion efficiency η = 10.5% with record high ZTmax = 1.35.
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37

Algethami, Merfat. « Bismuth/bismuth oxide-incorporated reduced graphene oxide nanocomposite : synthesis, characterisation, and photocatalytic activity ». Materials Research Express 9, no 2 (1 février 2022) : 025001. http://dx.doi.org/10.1088/2053-1591/ac4ebb.

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Abstract This study loaded Bi/Bi2O3 on the surface of reduced graphene oxide (rGO) to perform a two-step facile synthesis of rGO@Bi/Bi2O3 as a bismuth-based nanocomposite. First, Bi/Bi2O3 nanocomposites were synthesised via a solvothermal process using Bi(NO3)3 5H2O as the Bi3+ precursor and dimethyl sulfoxide (DMSO) as the solvent. Second, we exfoliated rGO in water to functionalise Bi/Bi2O3 with a few layers of rGO. Obtained nanocomposites were characterised with scanning electron microscopy and X-ray diffraction. We also measured the nanocomposites’ photocatalytic activity using cationic dyes, specifically methylene blue (MB) and rhodamine B (RhB). Additionally, ultraviolet-visible spectroscopy was used to determine the optical properties of rGO@Bi/Bi2O3. Photodegradation was recorded under differing durations of exposure to visible light. Reaction rates were recorded at 14.6 × 10–4 min−1 and 22.2 × 10–3 min−1 for MB and RhB, respectively, while photodegradation efficiency was logged at 17% and 81%.
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Naveed, Abdul Basit, Fakhira Riaz, Azhar Mahmood, Ammara Shahid et Saman Aqeel. « A Facile Synthesis of Bi2O3/CoFe2O4 Nanocomposite with Improved Synergistic Photocatalytic Potential for Dye Degradation ». Catalysts 11, no 10 (28 septembre 2021) : 1180. http://dx.doi.org/10.3390/catal11101180.

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Semiconductor-based photocatalysis is a probable approach to overcoming many pollution problems and eradicating toxic organic materials from wastewater. This research endeavor aimed to explore the synergistic potential of different semiconductor nanocomposites for photocatalytic degradation of organic pollutants in contaminated water. A facile hydrothermal approach was employed to synthesize bismuth oxide and cobalt ferrite nanoparticles from their precursors—bismuth nitrate pentahydrate, ferric chloride hexahydrate and cobalt chloride hexahydrate—with various concentrations and conditions to optimize the product. Subsequently, nanocomposites of bismuth oxide and cobalt ferrite were prepared by solid-state mixing in varying concentrations followed by calcination. UV/visible diffuse reflectance spectroscopy, X-ray diffraction, scanning electron microscopy and elemental dispersive X-ray spectroscopic techniques have corroborated the successful synthesis of nanocomposites. The energy gaps of bismuth oxide and cobalt ferrite nanocomposites were computed in the range of 1.58–1.62 eV by Tauc plots. These nanocomposite materials were ascertained for photocatalytic potential to degrade methyl orange organic dye in water. A nanocomposite with equiquantic proportions has shown the best photocatalytic degradation activity, which may be attributed to the type-II band configuration and a synergistic effect, because Bi2O3 acts as an electron sink. This synergism has reduced the cogent band gap, hindered electron hole recombination and increased electron hole availabilities for photodegradation reactions, thus ensuing an efficient photodegradation co-work of Bi2O3/CoFe2O4 nanocomposites.
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Akbarzadeh, Rokhsareh, et Patrick Gathura Ndungu. « A Novel BiOCl Based Nanocomposite Membrane for Water Desalination ». Membranes 12, no 5 (10 mai 2022) : 505. http://dx.doi.org/10.3390/membranes12050505.

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In this study, BiOCl based nanocomposites were used as photocatalytic membranes for a simulated study on water desalination in reverse osmosis membrane systems. Through molecular dynamic simulation, the molecular structure of BiOCl, BiOCl/Ag2S and BiOCl/Bi2O3 heterojunctions were designed and their electronic properties, mechanical properties, and membrane performance for water desalination were evaluated for the first time. The molecular structure was created, and a geometry optimization task was used to optimize it. Material Studio 2019 CASTEP was used for simulation of the electronic and mechanical properties and water desalination was performed by ReaxFF software under pressures between 0 and 250 MPa. The novel BiOCl based nanocomposites showed improved electronic and mechanical properties and, most importantly, improvements in salt rejection and water permeability as compared to well-known materials such as graphene and MoS2. BiOCl and BiOCl/Ag2S had a bandgap around two, which is the ideal bandgap for semiconductor photocatalysts. A salt rejection of 98% was achieved under an applied pressure of 10 MPa. Salt rejection was higher for BiOCl/Bi2O3, while water permeability was higher for BiOCl/Ag2S. The monolayer BiOCl was unstable under pressures higher than 50 MPa, but the mechanical stability of BiOCl/Ag2S increased twofold and increased fourfold for BiOCl/Bi2O3, which is even higher than MoS2. However, between the three nanocomposites, BiOCl/Ag2S was found to be the most ideal photocatalytic nanocomposite membrane.
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Sayyadi, Elahe, Asghar Mesbahi, Reza Eghdam Zamiri et Farshad Seyyed Nejad. « A comprehensive Monte Carlo study to design a novel multi-nanoparticle loaded nanocomposites for augmentation of attenuation coefficient in the energy range of diagnostic X-rays ». Polish Journal of Medical Physics and Engineering 27, no 4 (1 décembre 2021) : 279–89. http://dx.doi.org/10.2478/pjmpe-2021-0033.

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Abstract Introduction: The present study aimed to investigate the radiation protection properties of silicon-based composites doped with nano-sized Bi2O3, PbO, Sm2O3, Gd2O3, WO3, and IrO2 particles. Radiation shielding properties of Sm2O3 and IrO2 nanoparticles were investigated for the first time in the current study. Material and methods: The MCNPX (2.7.0) Monte Carlo code was utilized to calculate the linear attenuation coefficients of single and multi-nano structured composites over the X-ray energy range of 10–140 keV. Homogenous distribution of spherical nanoparticles with a diameter of 100 nm in a silicon rubber matrix was simulated. The narrow beam geometry was used to calculate the photon flux after attenuation by designed nanocomposites. Results: Based on results obtained for single nanoparticle composites, three combinations of different nano-sized fillers Sm2O3+WO3+Bi2O3, Gd2O3+WO3+Bi2O3, and Sm2O3+WO3+PbO were selected, and their shielding properties were estimated. In the energy range of 20-60 keV Sm2O3 and Gd2O3 nanoparticles, in 70-100 keV energy range WO3 and for photons energy higher than 90 keV, PbO and Bi2O3 nanoparticles showed higher attenuation. Despite its higher density, IrO2 had lower attenuation compared to other nanocomposites. The results showed that the nanocomposite containing Sm2O3, WO3, and Bi2O3 nanoparticles provided better shielding among the studied samples. Conclusions: All studied multi-nanoparticle nanocomposites provided optimum shielding properties and almost 8% higher attenuation relative to single nano-based composites over a wide range of photon energy used in diagnostic radiology. Application of these new composites is recommended in radiation protection. Further experimental studies are suggested to validate our findings.
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Fedosenko, V. S., M. M. Iji, A. A. Lozovenko et G. G. Gorokh. « Bismuth Oxide-based Matrix Nanosystems for X-ray Contrast Diagnostics and Protection from Ionizing Radiation ». Doklady BGUIR 21, no 1 (2 mars 2023) : 89–93. http://dx.doi.org/10.35596/1729-7648-2023-21-1-89-93.

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The features of the bismuth oxide deposition by the ion layering method on matrices of anodic alumina and anodic titania have been studied. The formed nanostructured systems have been studied by means of electron micros copy, X-ray microanalysis, and X-ray spectroscopy. Two-layer nanocomposites consist of porous matrix or TiO2 island film with vertically oriented Bi2O3 plates placed on the surface. The photoluminescence spectrum of Al2O3/Bi2O3 oxide structure contains two photoluminescence channels with peaks at 460 and 560 nm upon excitation at 345 nm. Analysis of the EDX spectra showed that the atomic ratio of Bi, Ti and O was 31.46 % Bi : 3.78 % Ti : 51.05 % O. The possibility of using complex nanocomposite as contrast agents in X-ray diagnostics and for protection against ionizing radiation is shown.
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Sal, Bilal Abu. « Luminescence Spectra of C6H9EuO6 x H2O Doped Synthetic Opals Matrix Containing Bi-Active Dielectrics ». Journal of Materials Science Research 8, no 3 (15 juillet 2019) : 1. http://dx.doi.org/10.5539/jmsr.v8n3p1.

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This paper presents the results of experimental studies for the luminescence spectral intensity redistribution of opal photonic crystals containing various active dielectrics - Bi12SiO20, opal - Bi2TeO5 and opal - NaBi(MoO4)2 matrix nanocomposites and filled with europium C6H9EuO6 x H2O salt. Ultraviolet excitation was provided by semiconductor laser operating at wavelengths of 400nm and 100 mW average power. An increase in the integral luminescence intensity of the matrix composite opal - Bi12SiO20: Eu3+ was found. The possibility of the participation of bismuth ions as a co-activator and luminescence concentrator also is analyzed. It has been proposed to use opal-Bi12SiO20 nanocomposite filled with europium as a potentially attractive material to improving the solar cell efficiency.
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Kumar, Sunil, Deepti Chaudhary, Punit Kumar Dhawan, R. R. Yadav et Neeraj Khare. « Bi2Te3-MWCNT nanocomposite : An efficient thermoelectric material ». Ceramics International 43, no 17 (décembre 2017) : 14976–82. http://dx.doi.org/10.1016/j.ceramint.2017.08.017.

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Vega-Verduga, Carolina, et Caterine Daza-Gómez. « SÍNTESIS Y CARACTERIZACIÓN DE COMPOSITOS A BASE DE HALLOYSITA CON NANOESTRUCTURAS DE BISMUTO ». infoANALÍTICA 8, no 1 (17 janvier 2020) : 153–67. http://dx.doi.org/10.26807/ia.v8i1.124.

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En el desarrollo de este trabajo de investigación se han sintetizado y caracterizado nanocompositos en base de halloysita con nanopartículas de sulfuro de bismuto. La halloysita, es un filosilicato que se encuentra en forma de nanotubos de multicapas y constituye una alternativa de morfología similar a los nanotubos de carbono; sin embargo, posee características químicas distintas en la superficie externa e interna. La síntesis se llevó a cabo utilizando un método de impregnación de los precursores en nanotubos de halloysita para el posterior crecimiento de las nanopartículas in situ. La caracterización incluyó espectroscopias de absorción electrónica (UV-visible) y difracción de rayos X, en polvos. La morfología de los nanocompositos preparados se evidenció utilizando microscopía de barrido electrónico (SEM) y microscopía de transmisión electrónica(TEM); además se utilizó espectroscopia de energía dispersiva (EDS) para identificar elementos particulares y su distribución en la muestra. Los resultados indican que las nanopartículas de Bi2S3 (Bi2S3 NPs), de morfología esférica, se depositaron de manera uniforme sobre los nanotubos de halloysita (HNTs). Las partículas en el nanocomposito presentaron mayor diámetro que las partículas sintetizadas sin HNTs. Este cambio se evidencia en la reducción del ancho del pico en los patrones de difracción y en la disminución de valor de energía de la brecha energética. La formación del nanocomposito contribuyó a mantener las nanopartículas dispersas de manera homogénea sobre halloysita, evitando su aglomeración. Además, se evidenció el control de tamaño y morfología cuando se utiliza los nanotubos como soporte.
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Silva Almeida, Miguel Ângelo, João M. Magalhães, Maria M. Maia, Ana L. Pires et André M. Pereira. « Embedding Multi-Wall Carbon Nanotubes as Conductive Nanofiller onto Bi2Te3 Thermoelectric Matrix ». U.Porto Journal of Engineering 8, no 3 (30 mai 2022) : 35–41. http://dx.doi.org/10.24840/2183-6493_008.003_0008.

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Thermoelectric Generators (TEGs) are devices that have the ability to directly convert heat into electrical power, or vice-versa, and are being envisaged as one off-the-grid power source. Furthermore, carbon-based materials have been used as a conducting filler to improve several properties in thermoelectric materials. The present work studied the influence on the thermoelectric performance of Bi2Te3 bulk materials by incorporating different concentrations of Multi-Walled Carbon Nanotubes (MWCNT). In order to control and understand the influence of MWCNT dispersion in the nanocomposite, two different production methods (manual grinding and ultrasonication) were carried out and compared. It was verified that a larger dispersion leads to a better outcome for thermoelectric performance. The achieved Seebeck coefficient was up to -162 µV K-1 with a Power Factor of 0.50 µW K-2m-1, for the nanocomposite produced with 11.8 %V of MWCNT. This result demonstrates the ability to increase the thermoelectric performance of Bi2Te3 throughout the addition of MWCNT.
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Deng, Yuan, Chang-Wei Cui, Ni-La Zhang, Tian-Hao Ji, Qing-Lin Yang et Lin Guo. « Bi2Te3–Te nanocomposite formed by epitaxial growth of Bi2Te3 sheets on Te rod ». Journal of Solid State Chemistry 179, no 5 (mai 2006) : 1575–80. http://dx.doi.org/10.1016/j.jssc.2006.02.014.

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Mostafa, Mohamed Mokhtar Mohamed, Ahmed Shawky, Sharif Fakhruz Zaman, Katabathini Narasimharao, Mohamed Abdel Salam, Abdulmohsen Ali Alshehri, Nezar H. Khdary, Sulaiman Al-Faifi et Abhishek Dutta Chowdhury. « Visible-Light-Driven CO2 Reduction into Methanol Utilizing Sol-Gel-Prepared CeO2-Coupled Bi2O3 Nanocomposite Heterojunctions ». Catalysts 12, no 11 (19 novembre 2022) : 1479. http://dx.doi.org/10.3390/catal12111479.

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Carbon dioxide (CO2) photoreduction into renewable fuels over semiconductor photocatalysts has emerged as a green and sustainable alternative for energy production. Consequently, tremendous efforts are being performed to develop robust and sustainable photocatalysts. Therefore, visible-light active nanocomposite photocatalysts composed of 5.0–20.0 wt.% bismuth oxide (Bi2O3) and cerium oxide (CeO2) were synthesized by a sol-gel-based process. The prepared nanocomposites were evaluated for the promoted photocatalytic reduction of CO2 into methanol (CH3OH). Various characterizations of the obtained photocatalysts exposed an outstanding development of crystalline structure, morphology, and surface texture due to the presence of Bi2O3. Moreover, the absorbance of light in the visible regime was improved with enhanced charge separation, as revealed by the exploration of optical response, photoluminescence, and photocurrent measurements. The overall bandgap calculations revealed a reduction to 2.75 eV for 15% Bi2O3/CeO2 compared to 2.93 eV for pure CeO2. Moreover, the adjusted 2.8 g L−1 dose of 15% Bi2O3/CeO2 selectively produced 1300 μmol g−1 CH3OH after 9 h of visible light irradiation. This photocatalyst also exhibits bearable reusability five times. The improved progression of 15% Bi2O3/CeO2 is denoted by significant charge separation as well as enhanced mobility. This study suggests the application of metal oxide-based heterojunctions for renewable fuel production under visible light.
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Li, Guangli, Xiaoman Qi, Yang Xiao, Yuchi Zhao, Kanghua Li, Yonghui Xia, Xuan Wan, Jingtao Wu et Chun Yang. « An Efficient Voltammetric Sensor Based on Graphene Oxide-Decorated Binary Transition Metal Oxides Bi2O3/MnO2 for Trace Determination of Lead Ions ». Nanomaterials 12, no 19 (23 septembre 2022) : 3317. http://dx.doi.org/10.3390/nano12193317.

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Herein we present a facile synthesis of the graphene oxide-decorated binary transition metal oxides of Bi2O3 and MnO2 nanocomposites (Bi2O3/MnO2/GO) and their applications in the voltammetric detection of lead ions (Pb2+) in water samples. The surface morphologies, crystal structures, electroactive surface area, and charge transferred resistance of the Bi2O3/MnO2/GO nanocomposites were investigated through the scanning electron microscopy (SEM), power X-ray diffraction (XRD), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) techniques, respectively. The Bi2O3/MnO2/GO nanocomposites were further decorated onto the surface of a glassy carbon electrode (GCE), and Pb2+ was quantitatively analyzed by using square-wave anodic stripping voltammetry (SWASV). We explored the effect of the analytical parameters, including deposition potential, deposition time, and solution pH, on the stripping peak current of Pb2+. The Bi2O3/MnO2/GO nanocomposites enlarged the electroactive surface area and reduced the charge transferred resistance by significant amounts. Moreover, the synergistic enhancement effect of MnO2, Bi2O3 and GO endowed Bi2O3/MnO2/GO/GCE with extraordinary electrocatalytic activity toward Pb2+ stripping. Under optimal conditions, the Bi2O3/MnO2/GO/GCE showed a broad linear detection range (0.01–10 μM) toward Pb2+ detection, with a low limit of detection (LOD, 2.0 nM). The proposed Bi2O3/MnO2/GO/GCE electrode achieved an accurate detection of Pb2+ in water with good recoveries (95.5–105%).
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Huang, Hui, Sai Jun Gu, Yong Ping Gan, Xin Yong Tao et Wen Kui Zhang. « ZnO/ZnO-Bi2O3 Nanocomposite as an Anode Material for Ni-Zn Rechargeable Battery ». Advanced Materials Research 396-398 (novembre 2011) : 1725–29. http://dx.doi.org/10.4028/www.scientific.net/amr.396-398.1725.

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A novel ZnO/ZnO-Bi2O3 nanocomposite was prepared by a homogeneous precipitation method. The nucleation sites, namely ZnO-Bi2O3 particles with nominal chemical composition of (ZnO)0.94(Bi2O3)0.06, were prepared by ball milling and subsequent annealing treatment. The as-synthesized materials were characterized by XRD, SEM and electrochemical measurements. Compared with single ZnO, the ZnO/ZnO-Bi2O3 nanocomposite show better cycling stability and higher discharge capacity. When the content of ZnO-Bi2O3 was 15 wt.%, the discharge capacity of ZnO/ZnO-Bi2O3 nanocomposite hardly declined over 60 cycling test, the average discharge capacity reached 590.2 mAh g−1. Cyclic voltammograms clearly illuminated that the added ZnO-Bi2O3 particles could decrease electrode polarization, maintain the electrochemical activity, and enhance the discharge capacity of ZnO.
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Thumwong, Arkarapol, Manchusa Chinnawet, Preawpraw Intarasena, Chanis Rattanapongs, Shinji Tokonami, Tetsuo Ishikawa et Kiadtisak Saenboonruang. « A Comparative Study on X-ray Shielding and Mechanical Properties of Natural Rubber Latex Nanocomposites Containing Bi2O3 or BaSO4 : Experimental and Numerical Determination ». Polymers 14, no 17 (2 septembre 2022) : 3654. http://dx.doi.org/10.3390/polym14173654.

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This work experimentally determined the X-ray shielding and morphological, density, and tensile properties of sulfur-vulcanized natural rubber latex (SVNRL) nanocomposites containing varying content of nano-Bi2O3 or nano-BaSO4 from 0 to 200 phr in 100 phr increments, with modified procedures in sample preparation to overcome the insufficient strength of the samples found in other reports. The experimental X-ray shielding results, which were numerically verified using a web-based software package (XCOM), indicated that the overall X-ray attenuation abilities of the SVNRL nanocomposites generally increased with increasing filler content, with the 0.25-mm-thick SVNRL films containing 200 phr of the filler providing the highest overall X-ray shielding properties, as evidenced by the highest values of lead equivalence (Pbeq) of 0.0371 mmPb and 0.0326 mmPb in Bi2O3/SVNRL nanocomposites, and 0.0326 mmPb and 0.0257 mmPb in BaSO4/SVNRL nanocomposites, for 60 kV and 100 kV X-rays, respectively. The results also revealed that the addition of either filler increased the tensile modulus at 300% elongation (M300) and density but decreased the tensile strength and the elongation at break of the Bi2O3/SVNRL and BaSO4/SVNRL nanocomposites. In addition, the modified procedures introduced in this work enabled the developed nanocomposites to acquire sufficient mechanical and X-ray shielding properties for potential use as medical X-ray protective gloves, with the recommended content of Bi2O3 and BaSO4 being in the range of 95–140 phr and 105–120 phr, respectively (in accordance with the requirements outlined in ASTM D3578-19 and the value of Pbeq being greater than 0.02 mmPb). Consequently, based on the overall outcomes of this work, the developed Bi2O3/SVNRL and BaSO4/SVNRL nanocomposites show great potential for effective application in medical X-ray protective gloves, while the modified procedures could possibly be adopted for large-scale production.
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