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Nanomaterials
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Study on the Thermoelectric Properties of Nanostructured Materials
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Study on the Thermoelectric Properties of Nanostructured Materials

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanoelectronics, Nanosensors and Devices".

Deadline for manuscript submissions: 10 September 2024 | Viewed by 2139

Special Issue Editors

Dr. Qiang Zhang

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Guest Editor
Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
Interests: thermoelectric materials: fabrication and microstructure characterization; thermoelectric transport properties; mechanical properties
Prof. Dr. Shaoping Chen

E-Mail Website
Guest Editor
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Interests: thermoelectric transport properties; interfaces of thermoelectric modules
Dr. Nagendra Singh Chauhan

E-Mail Website
Guest Editor
Thermal Energy Materials Group, Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Japan
Interests: thermoelectrics; alloys engineering; functional crystallography; electronic materials; thermal physics

Special Issue Information

Dear Colleagues,

Traditional carbon-based fossil energy resources emit greenhouse gases from human activities, making the average global temperature increase by 1℃ in 2018, and be estimated to continue to increase by 1.5℃ by as early as 2030. Thermoelectric materials can convert heat to electricity and vice versa without any noise, vibration, and emissions, facilitating the minimization of energy consumption and environmental damage. Thermoelectric conversion efficiency is primarily governed by the figure of merit ZT, which requires high electrical conductivity and Seebeck coefficient, as well as low lattice thermal conductivity. The advent of nanostructured thermoelectrics in the early 2000s led to a resurgence of interest in waste–heat utilization. Since nanostructuring can exert great influence over the carrier mobility, the Seebeck coefficient (energy filtering effect) and the phonon transport, a rational design of nanostructure can strike a superior synergy for high thermoelectric performance. In addition, a deeper understanding of the influencing mechanisms of nanostructuring towards electrical and thermal transport properties is also extremely desirable.

This Special Issue welcomes cutting-edge contributions devoted to the finding of new nanomaterials, novel synthesis methods, experimental characterization, computational modeling studies, as well as research on electrical and thermal transport properties, all of which need to be related to nanostructured thermoelectrics.

Dr. Qiang Zhang
Prof. Dr. Shaoping Chen
Dr. Nagendra Singh Chauhan
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Nanomaterials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • thermoelectric properties
  • nanomaterials
  • charge carrier scattering
  • phonon scattering
  • electronic energy band structure
  • carrier effective mass
  • carrier mobility
  • phonon velocity

Published Papers (3 papers)

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Research

12 pages, 1466 KiB  
Article
Greatly Enhanced Thermoelectric Performance of Flexible Cu2−xS Composite Film on Nylon by Se Doping
by Xinru Zuo, Xiaowen Han, Zixing Wang, Ying Liu, Jiajia Li, Mingcheng Zhang, Changjun Huang and Kefeng Cai
Nanomaterials 2024, 14(11), 950; https://doi.org/10.3390/nano14110950 - 28 May 2024
Viewed by 246
Abstract
In this work, flexible Cu2−xS films on nylon membranes are prepared by combining a simple hydrothermal synthesis and vacuum filtration followed by hot pressing. The films consist of Cu2S and Cu1.96S two phases with grain sizes from [...] Read more.
In this work, flexible Cu2−xS films on nylon membranes are prepared by combining a simple hydrothermal synthesis and vacuum filtration followed by hot pressing. The films consist of Cu2S and Cu1.96S two phases with grain sizes from nano to submicron. Doping Se on the S site not only increases the Cu1.96S content in the Cu2−xS to increase carrier concentration but also modifies electronic structure, thereby greatly improves the electrical properties of the Cu2−xS. Specifically, an optimal composite film with a nominal composition of Cu2−xS0.98Se0.02 exhibits a high power factor of ~150.1 μW m−1 K−2 at 300 K, which increases by ~138% compared to that of the pristine Cu2-xS film. Meanwhile, the composite film shows outstanding flexibility (~97.2% of the original electrical conductivity is maintained after 1500 bending cycles with a bending radius of 4 mm). A four-leg flexible thermoelectric (TE) generator assembled with the optimal film generates a maximum power of 329.6 nW (corresponding power density of 1.70 W m−2) at a temperature difference of 31.1 K. This work provides a simple route to the preparation of high TE performance Cu2-xS-based films. Full article
(This article belongs to the Special Issue Study on the Thermoelectric Properties of Nanostructured Materials)
14 pages, 4636 KiB  
Article
Enhancement of ZT in Bi0.5Sb1.5Te3 Thin Film through Lattice Orientation Management
by Wei-Han Tsai, Cheng-Lung Chen, Ranganayakulu K. Vankayala, Ying-Hsiang Lo, Wen-Pin Hsieh, Te-Hsien Wang, Ssu-Yen Huang and Yang-Yuan Chen
Nanomaterials 2024, 14(9), 747; https://doi.org/10.3390/nano14090747 - 25 Apr 2024
Viewed by 521
Abstract
Thermoelectric power can convert heat and electricity directly and reversibly. Low-dimensional thermoelectric materials, particularly thin films, have been considered a breakthrough for separating electronic and thermal transport relationships. In this study, a series of Bi0.5Sb1.5Te3 thin films with [...] Read more.
Thermoelectric power can convert heat and electricity directly and reversibly. Low-dimensional thermoelectric materials, particularly thin films, have been considered a breakthrough for separating electronic and thermal transport relationships. In this study, a series of Bi0.5Sb1.5Te3 thin films with thicknesses of 0.125, 0.25, 0.5, and 1 μm have been fabricated by RF sputtering for the study of thickness effects on thermoelectric properties. We demonstrated that microstructure (texture) changes highly correlate with the growth thickness in the films, and equilibrium annealing significantly improves the thermoelectric performance, resulting in a remarkable enhancement in the thermoelectric performance. Consequently, the 0.5 μm thin films achieve an exceptional power factor of 18.1 μWcm−1K−2 at 400 K. Furthermore, we utilize a novel method that involves exfoliating a nanosized film and cutting with a focused ion beam, enabling precise in-plane thermal conductivity measurements through the 3ω method. We obtain the in-plane thermal conductivity as low as 0.3 Wm−1K−1, leading to a maximum ZT of 1.86, nearing room temperature. Our results provide significant insights into advanced thin-film thermoelectric design and fabrication, boosting high-performance systems. Full article
(This article belongs to the Special Issue Study on the Thermoelectric Properties of Nanostructured Materials)
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14 pages, 4748 KiB  
Article
A Novel PDMS-Based Flexible Thermoelectric Generator Fabricated by Ag2Se and PEDOT:PSS/Multi-Walled Carbon Nanotubes with High Output Performance Optimized by Embedded Eutectic Gallium–Indium Electrodes
by Rui Guo, Weipeng Shi, Rui Guo, Chenyu Yang, Yi Chen, Yonghua Wang, Danfeng Cui, Dan Liu and Chenyang Xue
Nanomaterials 2024, 14(6), 542; https://doi.org/10.3390/nano14060542 - 20 Mar 2024
Viewed by 985
Abstract
Flexible thermoelectric generators (FTEGs), which can overcome the energy supply limitations of wearable devices, have received considerable attention. However, the use of toxic Te-based materials and fracture-prone electrodes constrains the application of FTEGs. In this study, a novel Ag2Se and Poly [...] Read more.
Flexible thermoelectric generators (FTEGs), which can overcome the energy supply limitations of wearable devices, have received considerable attention. However, the use of toxic Te-based materials and fracture-prone electrodes constrains the application of FTEGs. In this study, a novel Ag2Se and Poly (3,4-ethylene dioxythiophene): poly (styrene sulfonate) (PEDOT:PSS)/multi-walled carbon nanotube (MWCNT) FTEG with a high output performance and good flexibility is developed. The thermoelectric columns formulated in the work are environmentally friendly and reliable. The key enabler of this work is the use of embedded EGaIn electrodes, which increase the temperature difference collected by the thermoelectric column, thereby improving the FTEG output performance. Additionally, the embedded EGaIn electrodes could be directly printed on polydimethylsiloxane (PDMS) molds without wax paper, which simplifies the preparation process of FTEGs and enhances the fabrication efficiency. The FTEG with embedded electrodes exhibits the highest output power density of 25.83 μW/cm2 and the highest output power of 10.95 μW at ΔT = 15 K. The latter is 31.6% higher than that of silver-based FTEGs and 2.5% higher than that of covered EGaIn-based FTEGs. Moreover, the prepared FTEG has an excellent flexibility (>1500 bends) and output power stability (>30 days). At high humidity and high temperature, the prepared FTEG maintains good performance. These results demonstrate that the prepared FTEGs can be used as a stable and environmentally friendly energy supply for wearable devices. Full article
(This article belongs to the Special Issue Study on the Thermoelectric Properties of Nanostructured Materials)
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