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Keywords = bismuth selenide nanostructures

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12 pages, 4050 KB  
Article
Controlling the Crystallinity and Morphology of Bismuth Selenide via Electrochemical Exfoliation for Tailored Reverse Saturable Absorption and Optical Limiting
by Hao Yan, Bingxue Li, Junjie Pan, Xuan Fang, Yongji Yu, Dengkui Wang, Dan Fang, Yanyan Zhan, Xiaohua Wang, Jinhua Li, Xiaohui Ma and Guangyong Jin
Nanomaterials 2025, 15(1), 52; https://doi.org/10.3390/nano15010052 - 31 Dec 2024
Viewed by 1130
Abstract
As an emerging two-dimensional (2D) Group-VA material, bismuth selenide (Bi2Se3) exhibits favorable electrical and optical properties. Here, three distinct morphologies of Bi2Se3 were obtained from bulk Bi2Se3 through electrochemical intercalation exfoliation. And the [...] Read more.
As an emerging two-dimensional (2D) Group-VA material, bismuth selenide (Bi2Se3) exhibits favorable electrical and optical properties. Here, three distinct morphologies of Bi2Se3 were obtained from bulk Bi2Se3 through electrochemical intercalation exfoliation. And the morphologies of these nanostructures can be tuned by adjusting solvent polarity during exfoliation. Then, the nonlinear optical and absorption characteristics of the Bi2Se3 samples with different morphologies were investigated using open-aperture Z-scan technology. The results reveal that the particle structure of Bi2Se3 exhibits stronger reverse saturable absorption (RSA) than the sheet-like structure. This is attributed to the higher degree of oxidation and greater number of localized defect states in the particle structure than in the sheet-like structure. Electrons in these defect states can be excited to higher energy levels, thereby triggering excited-state and two-photon absorption, which strengthen RSA. Finally, with increasing the RSA, the optical limiting threshold of 2D Bi2Se3 can also be increased. This work expands the potential applications of 2D Bi2Se3 materials in the field of broadband nonlinear photonics. Full article
(This article belongs to the Section Nanoelectronics, Nanosensors and Devices)
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11 pages, 2447 KB  
Article
Flexible N-Type Thermoelectric Composites Based on Non-Conductive Polymer with Innovative Bi2Se3-CNT Hybrid Nanostructured Filler
by Juris Bitenieks, Krisjanis Buks, Remo Merijs-Meri, Jana Andzane, Tatjana Ivanova, Lasma Bugovecka, Vanda Voikiva, Janis Zicans and Donats Erts
Polymers 2021, 13(23), 4264; https://doi.org/10.3390/polym13234264 - 6 Dec 2021
Cited by 16 | Viewed by 3316
Abstract
This research is devoted to the fabrication of polyvinyl alcohol (PVOH) based n-type thermoelectric composites with innovative hybrid bismuth selenide-multiwalled carbon nanotube (Bi2Se3-MWCNT) fillers for application in flexible thermoelectric devices. Hybrid fillers were synthesized by direct deposition of Bi [...] Read more.
This research is devoted to the fabrication of polyvinyl alcohol (PVOH) based n-type thermoelectric composites with innovative hybrid bismuth selenide-multiwalled carbon nanotube (Bi2Se3-MWCNT) fillers for application in flexible thermoelectric devices. Hybrid fillers were synthesized by direct deposition of Bi2Se3 on multiwalled carbon nanotubes using a physical vapor deposition method, thus ensuring direct electrical contact between the carbon nanotubes and Bi2Se3. The Seebeck coefficient of prepared PVOH/Bi2Se3-MWCNT composites was found to be comparable with that for the Bi2Se3 thin films, reaching −100 µV·K−1 for the composite with 30 wt.% filler, and fluctuations of the resistance of these composites did not exceed 1% during 100 repetitive bending cycles down to 10 mm radius, indicating the good mechanical durability of these composites and proving their high potential for application in flexible thermoelectrics. In addition, other properties of the fabricated composites that are important for the use of polymer-based materials such as thermal stability, storage modulus and linear coefficient of thermal expansion were found to be improved in comparison with the neat PVOH. Full article
(This article belongs to the Section Biobased and Biodegradable Polymers)
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