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Academic literature on the topic 'Bi2Te3 NANOCOMPOSITES'

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Published: 11 September 2023

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Journal articles on the topic "Bi2Te3 NANOCOMPOSITES"

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Wang, Yanan, Cédric Bourgès, Ralph Rajamathi, C. Nethravathi, Michael Rajamathi, and 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 (December 22, 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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Zhmurova, Anna V., Galina F. Prozorova, and 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 (July 14, 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, and Jing Feng. "Facile Synthesis Bi2Te3 Based Nanocomposites: Strategies for Enhancing Charge Carrier Separation to Improve Photocatalytic Activity." Nanomaterials 11, no. 12 (December 14, 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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Kulbashinskii, V. A., V. G. Kytin, N. V. Maslov, P. Singha, Subarna Das, A. K. Deb, and 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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Du, Yong, Jia Li, Jiayue Xu, and Per Eklund. "Thermoelectric Properties of Reduced Graphene Oxide/Bi2Te3 Nanocomposites." Energies 12, no. 12 (June 24, 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, and A. J. Zhou. "Synthesis and transport properties of Bi2Te3 nanocomposites." Physica Scripta T129 (November 26, 2007): 120–22. http://dx.doi.org/10.1088/0031-8949/2007/t129/027.

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

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

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

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

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Dissertations / Theses on the topic "Bi2Te3 NANOCOMPOSITES"

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Kosalathip, Voravit. "Synthèse et caractérisation microstructurale de poudres nanométriques à base de Bi2Te3 et Sb2Te3 : contribution à l'état de l'art des nanocomposites thermoélectriques." Thesis, Vandoeuvre-les-Nancy, INPL, 2008. http://www.theses.fr/2008INPL033N/document.

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L’étude de matériaux thermoélectriques nanocomposites et nanostructurés est en plein essor suite à l’intérêt de multiplier le nombre d’interfaces et de diminuer la taille des objets pour améliorer les performances. Nous avons mis au point une nouvelle méthode de préparation de nanopoudres thermoélectriques de type n (Bi0.95Sb0.05)2(Te0.95Se0.05)3 et de type p (Bi0.2Sb0.8)2Te3, à partir de la fracturation laser en milieu aqueux de poudres de taille micrométrique. La cellule de préparation développée permet d’obtenir par jour environ 200 mg de poudres nanométriques cristallisés présentant la structure cristallographique des poudres initiales et dont la taille moyenne est comprise entre 7 et 12 nm. Les mécanismes mis en jeu dans l’obtention des nanoparticules ont été abordés. Ils dépendent fortement de la densité d’énergie du faisceau laser. Les nanopoudres ont ensuite été mélangées mécaniquement aux poudres micrométriques de même nature et ont été compactées à froid. Les propriétés thermoélectriques (résistivité électrique, pouvoir thermoélectrique, conductivité thermique) des nanocomposites ont été évaluées à température ambiante. Les premiers résultats montrent que même si le pouvoir thermoélectrique est maintenu dans les matériaux nanostructurés et nanocomposites et que la conductivité thermique totale peut, de manière tout à fait exceptionnelle, être diminuée d’un facteur deux, la résistivité électrique obtenue est jusqu’alors trop élevée pour conduire à de bonnes performances en terme de facteur de mérite adimensionnel, par rapport à un matériau massif conventionnel de même composition
The study of thermoelectric nanostructured and nanocomposite materials is expanding because of the interest to multiply the number of interfaces and to decrease the size of the objects in order to improve the thermoelectric performance. We developed a new method to prepare thermoelectric n type (Bi0.95Sb0.05)2(Te0.95Se0.05)3 and p type (Bi0.2Sb0.8)2Te3 nanopowders, from the laser fracture in a liquid medium of powders of micrometric size. The developed cell preparation makes it possible to obtain per day approximately 200 mg of crystallized nanometric powders having the crystallographic structure of the initial powders and whose mean size lies between 7 and 12 nm. The mechanisms concerned in obtaining the nanoparticules were approached. They strongly depend on the density of energy of the laser beam. The nanopowders then were mechanically mixed with the micrometric powders of comparable nature and were cold pressed. The thermoelectric properties (electrical resistivity, thermoelectric power, thermal conductivity) of the nanocomposites were evaluated at room temperature. The first results show that even if the thermoelectric power is maintained in nanostructured and nanocomposite materials and that the total thermal conductivity can, in a completely exceptional way, being decreased by a factor two, the electrical resistivity obtained is hitherto too high to lead to high values of the dimensionless thermoelectric figure of merit, with regard to conventional bulk materials of same composition
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Kosalathip, Voravit Dauscher Anne. "Synthèse et caractérisation microstructurale de poudres nanométriques à base de Bi2Te3 et Sb2Te3 contribution à l'état de l'art des nanocomposites thermoélectriques /." S. l. : INPL, 2008. http://www.scd.inpl-nancy.fr/theses/2008_KOSALATHIP_V.pdf.

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Доброжан, Олександр Анатолійович, Александр Анатольевич Доброжан, Oleksandr Anatoliiovych Dobrozhan, Анатолій Сергійович Опанасюк, Анатолий Сергеевич Опанасюк, Anatolii Serhiiovych Opanasiuk, Денис Ігорович Курбатов, et al. "Thermoelectric properties of the colloidal Bi2S3-based nanocomposites." Thesis, Jadavpur University, 2017. http://essuir.sumdu.edu.ua/handle/123456789/65347.

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In this work we present the proof of the concept of the novel strategy to improve the thermoelectric properties of Bi2S3based nanostructured bulk materials by blending the metallic nanoinclustions with the semiconductor nanoparticles forming the nanocomposites (NCts). The obtained NCts were composed of Bi2S3nanorods (length - 100 nm and width – 10 nm) and Ag nanoparticles (diameter - 2- 3 nm) synthesized by colloidal method. The morpohology, phase and chemical composition, electrical conductivity and Seebeck coefficient of NCts were investigated by using transmission electron microscopy (TEM), X-ray diffraction, energy dispersive X-ray analysis (EDAX), 4-point probes method and static dc-method. This strategy is the perspective way to improve the conversion efficiency of others thermoelectric materials.
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JAISWAL, HEMENDRA NATH. "SYNTHESIS OF Bi2Te3 NANOCOMPOSITES REINFORCED WITH MWCNTs." Thesis, 2015. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15568.

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A high purity single crystal Bismuth telluride ingot was synthesized by vertical directional solidification technique. As grown ingot was finely powdered by using mortar and pestle.It was then ball milled for 8hrs in order to reduced particle size further. MWCNTs was mixed with bismuth telluride powder in two different proportions. Two samples of MWCNTs reinforced bismuth telluride composites were prepared ,one contains 1.5% by weight CNTs and other contains 3% by weight CNTs. Both samples were ultrasonicated for 90 minutes for proper mixing of CNTs in bismuth telluride composites. After ultrasonication it was expected that CNTs were properly dispersed in bismuth telluride composites.
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Chao, Tz-Yuan, and 趙子元. "Preparation of Bi2Te3-based thermoelectric nanocomposites by powder metallurgy method." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/41148436516794176494.

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碩士
國立臺灣海洋大學
材料工程研究所
100
Abstract During mechanical alloying of Bi and Te elemental powder mixture, it is found the Bi2Te3 compound phase can be formed in a very short time of 60 seconds, the mechanically alloyed powders was completely transformed into Bi2Te3 phase with further milling to 15mins. The Bi0.4Sb1.6Te3 and Bi2Te2.4Se0.6 compound phase with 20 nm grain size can be obtained using the same method with stoichiometric composition after 2 hours of mechanical alloying treatment. A Ti50Cu28Ni15Sn7 amorphous powder was formed by 8 hours mechanical alloying of corresponding elemental mixtures. These amorphous powders were further milling with Bi and Te elemental powders and the Ti50Cu28Ni15Sn7 / Bi2Te3 composite powders with Ti50Cu28Ni15Sn7 amorphous particles inside nanostructured Bi2Te3 matrix were successfully prepared after 2 hours ball milling. The Ti50Cu28Ni15Sn7 / Bi2Te3 composite powders can be consolidated into bulk samples with a diameter of 20 mm and thickness of 8mm using by vacuum hot pressing. The microstructure of Ti50Cu28Ni15Sn7 / Bi2Te3 bulk samples shows that micro-scale Ti50Cu28Ni15Sn7 amorphous particles were homogeneously distributed inside nanostructured Bi2Te3 matrix. In addition, the Te precipitates were observed for the bulk samples consist of low purity Te. An unknown phase around amorphous particles was also found and it is suggested that the reaction between Te precipitates and amorphous phase was responsible. The thermoelectric properties of Ti50Cu28Ni15Sn7 / Bi2Te3-based samples were measured. The results indicated a very low ZT values were detected for the Ti50Cu28Ni15Sn7 / Bi2Te3 samples due to impurity effect. However, for bulk 0.75 wt. % Ti50Cu28Ni15Sn7/ Bi0.4Sb1.6Te3 thermoelectric composite, a ZT value of 1.08 at 306℃ was obtained. This is the highest ZT values among the exists thermoelectric materials at 300℃. Keywords:,mechanical alloying, Bi2Te3, Ti50Cu28Ni15Sn7, vacuum hot pressing, thermoelectric nanocomposites, amorphous, Seebeck coefficient, ZT
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Meena, Dilip Kumar. "Structural and Thermoelectric Studies of Sb2Te3 and Bi2Te3 Based Chalcogenide Alloys and Nanocomposites." Thesis, 2023. https://etd.iisc.ac.in/handle/2005/6064.

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Thermoelectricity is one of the potential solutions for the rapidly increasing energy demand. Thermoelectric generators can turn waste heat into usable energy. Due to their effectiveness in the 300 K to 500 K temperature range, Sb2Te3 and Bi2Te3 are two of the most researched thermoelectric materials. These thermoelectric materials that operate at room temperature can have their thermoelectric performance improved through doping, nanostructuring, orientation engineering, and nanocomposites, among other techniques. Due to their capacity to lower thermal conductivity (κ) while maintaining a high-power factor (PF=S2σ), nanocomposites and doping techniques have garnered the most attention among them. The rate of melt solidification has recently been demonstrated to have the ability to dramatically adjust the thermoelectric characteristics to a greater extent. The thermoelectric characteristics of Sb2Te3/Te nanocomposites and Bi2Te3 alloy were examined in the first section of this thesis. This work has shown that the rate of melt solidification has a substantial impact on the structural and thermoelectric properties. It has been demonstrated that the optimum way to get better thermoelectric performances is with moderate melt quenching rates (normal water and ice water quenching). The thermoelectric properties of nanocomposites made by combining Sb2Te3 and poly methyl methacrylate (PMMA) have been studied in the second section of the thesis. For polymer nanocomposites, thermal conductivity was found to be significantly reduced. A 30% reduction in thermal conductivity has been seen with 5% polymer composites. In the last part of the thesis, the effect of Zn doping on Sb2Te3 has been studied. The prepared powder samples were sintered by spark plasma sintering (SPS). An increase in Zn doping increased the power factor considerably because Zn+2 doping in place of Sb+3 in Sb2Te3 acts as an acceptor. It increases p-type carrier concentration and thereby enhances the electrical conductivity. The thermoelectric figure of merit was found to increase by 12 % for the Zn-doped Sb2Te3. The zT of the SPS sintered Zn-doped Sb2Te3 is increased by 80% compared to the as-prepared Sb2Te3 ingot. The results presented in this thesis demonstrate that the zT of thermoelectric materials can be modulated by using different melt solidification rates, doping, and by forming nanocomposites.
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Agarwal, Khushboo. "Structural, electical and thermal properties of bi2te3 based nanocomposites for thermoelectric applications." Thesis, 2017. http://localhost:8080/iit/handle/2074/7334.

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Lo, I.-Hsiang, and 羅一翔. "Fabrication and Characterization of Bi2Te3 nanoparticle-Polythiophene Nanocomposite for Thermoelectric Materials." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/17105999499148092665.

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碩士
淡江大學
化學工程與材料工程學系碩士班
96
The thermoelectric performance of a material could be evaluated by its figure of merit ZT which is consisted of Seebeck coefficient, electric conductivity, thermal conductivity and applied temperature. The ZT of the thermoelectric materials has approached the value of 1 in the 1960s, but does not have the significant breakthrough until the recent decade. In 1993, Mildred S. Dresselhaus proposed a new concept that the low-dimensional materials could have improved ZT and brought a hope to thermoelectric materials. In this study, we used this concept to prepare nanocomposites for thermoelectric materials. Here we proposed a new thermoelectric material by composite engineering, which was composed of conducting polymers and the conventional thermoelectric materials. Since the conventional thermoelectric materials have good electric conductivity and Seebeck coefficient, the conducting polymers with low thermal conductivity could increase the phonon scattering to ruin the thermal transportation in the prepared composites and maintain their electric properties. The thermoelectric performance could be adjusted by composite engineering. We chose the conducting polythiophene P3HT and the thermoelectric material Bi2Te3 which owned the best ZT at room temperature. In order to improve the miscibility between P3HT and Bi2Te3, firstly, we synthesized the protection agent 3-MHT with similar structure of P3HT to prepare Bi2Te3 nanorods. The protection agent 3-MHT identified by 1H-NMR and FTIR could fabricate Bi2Te3 nanorods with 350~1500 nm in length and 25~150nm in diameter dependent on their experimental parameters. TEM、XRD and EDS results identified and characterized Bi2Te3 nanorods correctly. The Bi2Te3 nanorods capped with 3-MHT guaranteed their miscibility with P3HT polymers. Secondly the designed nanocomposites were manufactured by a simple mixing of Bi2Te3 nanorods and P3HT polymer in solution. TEM image demonstrated a well-dispersed morphology of the Bi2Te3 nanorods in P3HT polymer matrix. We measured the bang-gap, electric conductivity and Seebeck coefficient of the prepared nanocomposites but the electric properties were not good as expectancy due to the electric-insulating protection agent 3-MHT. The addition of Bi2Te3 nanorods led to worse electric conductivity from 218 Ω-1m-1, the value of pristine P3HT polymers, to 76~113 Ω-1m-1 ¬and the Seebeck coefficient slightly increased from 32 µV/K to 37~39µV/K. The best ZT was estimated to be the value of 0.045 for the prepared P3HT-Bi2Te3 nanocomposites.
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Chang, Feng-Li, and 張逢立. "A Novel Chemical Route for Bi2Se3/TiO2, SiO2 or Polyaniline Nanocomposites." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/99756546434803117240.

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碩士
國立東華大學
化學系
93
Abstract Bi2Se3 and Bi2Te3 are layered, thermoelectrical materials used at room temperature. and their improvement in thermoelectric properties is of great importance. Earlier theoretical work has shown that the thermoelectric figure merit of low dimensional Bi2Se3/Bi2Te3 can be enhanced up to three times higher than that of the bulk materials. We have succeeded in reducing its dimension by intercalating nano-TiO2, -SiO2 or -polyaniline into the gallery of Bi2Se3. The driving force for the formation of these nanocomposites is the Coulombic interaction between positive and negative particles. Bi2Se3 layers carry negative charges; and TiO2, SiO2 or polyaniline carry poaitive charges. These nanocomposites are characterized by Zetasizer, XRD, TEM, TGA, Mass, and thermal / electrical conductivity measurements. The Zetasizer shows that the Zeta potential of exfoliated Bi2Se3 is around -40 mV. And, the higher the concentration of suspended Bi2Se3, the weaker the Zeta potential. The XRD reveals the d-spacing of Bi2Se3 being expanded from 2.82 nm to 4.38 nm, and 6.86 nm upon intercalation of TiO2, SiO2 particles respectively. As for the case nanopolyaniline-intercalated Bi2Se3, the gallery height is increased to 4.35 nm. The TEM shows that the diameter of the free TiO2 particles are about 80 nm, and that of nanopolyaniline particles are of 30 nm. The diameter of TiO2 intercalated particles is about 1.5 nm, which is much smaller than that of free TiO2 particles.
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Govinda, Gorle, and 高維達. "Development of Bi2Se3/ Graphene Based Nanocomposites as Catalyst, Sensor, Bioimaging and Antibacterial Agents." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/y53r2a.

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Book chapters on the topic "Bi2Te3 NANOCOMPOSITES"

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Low, It Meng, and Nurul Zahirah Noor Azman. "Effect of Bi2O3 Particle Sizes and Addition of Starch into Bi2O3–PVA Composites for X-Ray Shielding." In Polymer Composites and Nanocomposites for X-Rays Shielding, 107–21. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-13-9810-0_10.

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Okoth, Kevin Otieno, Ruth Nduta Wanjau, and Maurice Otieno Odago. "Semiconductor Nanocomposites-Based Photoelectrochemical Aptamer Sensors for Pharmaceuticals Detection." In Research Anthology on Synthesis, Characterization, and Applications of Nanomaterials, 685–708. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-8591-7.ch030.

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Development of sensors for pharmaceuticals has become very essential. This is due to the need to monitor the release and toxicological effects of pharmaceuticals into the environment. In this work, the authors explored bismuth sulphide (Bi2S3) nanorods and graphene as photoactive material for constructing a photoelectrochemical (PEC) aptasensor for sulfadimethoxine (SDM) detection, exhibiting high sensitivity, stability, and reproducibility. In another experiment, Mo-doped BiVO4 (Mo-BiVO4) and graphene nanocomposites were explored as photoactive material to construct a visible light-driven photoelectrochemical biosensor. Graphene in the nanocomposites was very essential in immobilizing streptomycin aptamer through π-π stacking interaction. Finally, graphene doped CdS (GR-CdS) synthesized via one pot hydrothermal technique and gold nanoparticles (Au NPs) were employed to construct a PEC aptasensor for diclofenac (DCF).
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Okoth, Kevin Otieno, Ruth Nduta Wanjau, and Maurice Otieno Odago. "Semiconductor Nanocomposites-Based Photoelectrochemical Aptamer Sensors for Pharmaceuticals Detection." In Advances in Environmental Engineering and Green Technologies, 109–32. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1871-7.ch007.

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Development of sensors for pharmaceuticals has become very essential. This is due to the need to monitor the release and toxicological effects of pharmaceuticals into the environment. In this work, the authors explored bismuth sulphide (Bi2S3) nanorods and graphene as photoactive material for constructing a photoelectrochemical (PEC) aptasensor for sulfadimethoxine (SDM) detection, exhibiting high sensitivity, stability, and reproducibility. In another experiment, Mo-doped BiVO4 (Mo-BiVO4) and graphene nanocomposites were explored as photoactive material to construct a visible light-driven photoelectrochemical biosensor. Graphene in the nanocomposites was very essential in immobilizing streptomycin aptamer through π-π stacking interaction. Finally, graphene doped CdS (GR-CdS) synthesized via one pot hydrothermal technique and gold nanoparticles (Au NPs) were employed to construct a PEC aptasensor for diclofenac (DCF).
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Conference papers on the topic "Bi2Te3 NANOCOMPOSITES"

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Zhou, J., and R. G. Yang. "Thermoelectric Transport in Sb2Te3/Bi2Te3 Quantum Dot Nanocomposites." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64923.

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We investigate the thermoelectric transport properties of Sb2Te3/Bi2Te3 quantum dot nanocomposites with spherical Sb2Te3 quantum dots arrays embedded in Bi2Te3 matrix through a two-channel transport model. In this model, the transport of quantum-confined electrons through the hopping mechanism is studied by tight-binding model together with Kubo formula and Green’s function method. The formation of minibands due to the quantum confinement and the phonon-bottleneck effect on carrier-phonon scattering are considered. The transport of bulk-like electrons is studied by Boltzmann-transport-equation-based model. We consider the intrinsic carrier scatterings as well as the carrier-interface scattering of these bulk-like electrons. Thermoelectric transport properties are studied with different quantum dot sizes, inter-dot distances, doping concentrations, and temperatures. We find that electrical conductivity and Seebeck coefficient can be enhanced simultaneously in Sb2Te3/Bi2Te3 quantum dot nanocomposites because of the formation of minibands and the phonon-bottleneck effect on carrier-phonon scattering. Our results could shed some light on the design of high-efficiency thermoelectric materials.
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2

Singha, Pintu, Subarna Das, S. Bandyopadhyay, V. A. Kulbashinskii, A. K. Deb, and Aritra Banerjee. "Structural and resistive property study of Bi2Te3+x% graphite nanocomposites." In DAE SOLID STATE PHYSICS SYMPOSIUM 2016. Author(s), 2017. http://dx.doi.org/10.1063/1.4980714.

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3

Liang, Xin-wei, Ning-yu Zeng, Jian Li, Zheng-Yong Huang, and Jian-ying Zhao. "Bi2Te3/Ti3C2Tx Nanocomposites and Its Thermoelectric Properties Study." In 2022 IEEE International Conference on High Voltage Engineering and Applications (ICHVE). IEEE, 2022. http://dx.doi.org/10.1109/ichve53725.2022.9961477.

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4

Akbar, Himyan, and Khaled Youssef. "The influence of Carbon Nanotubes on the Thermoelectric Properties of Bismuth Telluride." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0059.

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Abstract:
Thermoelectric materials are devices that have the ability to convert waste heat to electricity. The widespread use of thermoelectric materials is currently limited by the low value their figure-ofmerit (ZT). Bismuth telluride (Bi2Te3) is a promising thermoelectric material in the near room temperature applications that provides a ZT value ~ 1. In order to overcome the limitation of utilizing thermoelectric materials in waste heat recovery, a ZT value > 2 is required. In this current study multi-walled carbon nanotubes (MWCNT) was incorporated into Bi2Te3 bulk matrix system to enhance its mechanical and thermoelectric properties through powder processing techniques. The nanocrystalline Bi2Te3/MWCNT composites were prepared using high energy ball milling and spark plasma sintering (SPS) techniques. The structural characterization and the average grain size of both pristine Bi2Te3 and Bi2Te3/MWCNT was found to be approximately (~ 13 nm) and the average strain was found to be 0.2 using both X-ray Diffraction (XRD) and transmission electron microscopy (TEM) techniques. Vickers Microhardness test shows significant improvement of the nanocomposite hardness up to ~2 GPa as a function of increasing the MWCNT content. As for the dimensionless figure of merit (ZT) of the composite, it is expected to increase above the value of the pure binary Bi2Te3 in the temperature range of 298–498 K the addition of MWCNT increased the ZT value from 0.48 to maximum ZT value to 0.61 at 50oC, while at 150oC the ZT value was measured to be 0.35 and 0.43 for Bi2Te3 and MWCNT/Bi2Te3, respectively. It is considered that the enhancement of the thermoelectric performance of the composite mostly derived from the thermal conductivity, which is reduced by an active phonon-scattering at the MWCNT/Bi2Te3 interfaces.
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5

Ramam, Koduri, S. C. Gurumurthy, and B. S. Nagaraja. "Bi2Te3-PLZT(9/65/35)-PVDF multifunctional nanocomposite films for futuristic energy harvestors." In 2ND INTERNATIONAL CONFERENCE ON INVENTIVE RESEARCH IN MATERIAL SCIENCE AND TECHNOLOGY : ICIRMCT 2019. Author(s), 2019. http://dx.doi.org/10.1063/1.5095232.

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6

Celik, Emrah, Cagri Oztan, Yiqun Zhou, Roger LeBlanc, Oguz Genc, and Sedat Ballikaya. "Enhancement of Thermoelectric Figure of Merit of Bi2Te3 Using Carbon Dots." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-88280.

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Abstract:
Thermoelectric (TE) energy harvesters are multi-material solid-state devices that convert heat (i.e. a thermal gradient) directly into electric potential. Currently, the biggest challenge limiting the applications of thermoelectric devices is the low conversion efficiency (< 10%). To achieve higher thermoelectric efficiency, electrical conductivity and Seebeck coefficient of thermoelectric materials must be maximized allowing the flow of charge carriers and thermal conductivity must be minimized keeping high temperature gradient between hot and cold sides. These properties are strongly coupled to each other. In other words, improving one property deteriorates the other. In nanoscale however, manipulation of matter at the atomic level can decouple these properties. Nanoengineering is therefore considered to be the only remedy for the low conversion efficiency of thermoelectric materials. Current nanomanipulation techniques focus only on reducing thermal conductivity by scattering heat carrying phonons with nanoscale artifacts. We have observed that doping thermoelectric material with carbon quantum dots (size < 5 nm) tremendously increased electrical conductivity and thermoelectric power. In the control experiments using carbon powder (same chemical arrangement but larger scale, < 100 nm), we did not observe any increase in thermal power density evidencing the nanomanipulation of material properties using carbon quantum dots. Doping thermoelectric materials with carbon quantum dots has high potential due to the quantum enhancement effects on electrical properties of and needs to be further investigated for the design of novel nanocomposite materials with superior thermoelectrical properties.
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7

Norouzzadeh, Payam, and Daryoosh Vashaee. "The Effect of Grain Size and Volume Fraction on Charge Transport in Thermoelectric Nanocomposite of Bi2Te3-Sb2Te3." In 2012 IEEE Green Technologies Conference. IEEE, 2012. http://dx.doi.org/10.1109/green.2012.6200941.

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8

Choudhary, A. R., and S. A. Waghuley. "Complex optical study of chemically synthesized polypyrrole-Bi2O3-TiO2 nanocomposite." In EMERGING TECHNOLOGIES: MICRO TO NANO (ETMN-2017): Proceedings of the 3rd International Conference on Emerging Technologies: Micro to Nano. Author(s), 2018. http://dx.doi.org/10.1063/1.5047723.

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9

Rani, B. Jansi, A. Anusiya, G. Ravi, and R. Yuvakkumar. "Multi-phase CuBi2O4@CuO@α-Bi2O3 nanocomposite electrocatalyst for electrochemical water splitting application." In DAE SOLID STATE PHYSICS SYMPOSIUM 2018. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5113412.

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Berzhansky, V., A. Shaposhnikov, A. Karavainikov, A. Prokopov, T. Mikhailova, I. Lukienko, Yu Kharchenko, O. Miloslavskaya, and N. Kharchenko. "The effect of FR enhancement in reactive ion beam sputtered Bi, Gd, Al-substituted iron-garnets: Bi2O3 nanocomposite films." In 2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE). IEEE, 2012. http://dx.doi.org/10.1109/omee.2012.6464735.

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