Enhancing Modulation of Thermal Conduction in Vanadium Dioxide Thin Film by Nanostructured Nanogapsopen access
- Authors
- Choe, Hwan Sung; Suh, Joonki; Ko, Changhyun; Dong, Kaichen; Lee, Sangwook; Park, Joonsuk; Lee, Yeonbae; Wang, Kevin; Wu, Junqiao
- Issue Date
- Aug-2017
- Publisher
- Nature Publishing Group
- Citation
- Scientific Reports, v.7
- Journal Title
- Scientific Reports
- Volume
- 7
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/8178
- DOI
- 10.1038/s41598-017-07466-4
- ISSN
- 2045-2322
- Abstract
- Efficient thermal management at the nanoscale is important for reducing energy consumption and dissipation in electronic devices, lab-on-a-chip platforms and energy harvest/conversion systems. For many of these applications, it is much desired to have a solid-state structure that reversibly switches thermal conduction with high ON/OFF ratios and at high speed. Here we describe design and implementation of a novel, all-solid-state thermal switching device by nanostructured phase transformation, i.e., modulation of contact pressure and area between two poly-silicon surfaces activated by microstructural change of a vanadium dioxide (VO2) thin film. Our solid-state devices demonstrate large and reversible alteration of cross-plane thermal conductance as a function of temperature, achieving a conductance ratio of at least 2.5. Our new approach using nanostructured phase transformation provides new opportunities for applications that require advanced temperature and heat regulations.
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