期刊
NANO LETTERS
卷 21, 期 10, 页码 4388-4393出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c01034
关键词
nanocomposites; contact thermal resistance; Kapitza resistance; silver nanowires; polymer composites
类别
资金
- U.S. National Science foundation [1903645, 1532107]
- National Aeronautics and Space Administration [NSTRF18_80NSSC18K1165]
- NSF [NNCI-2025233]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1532107] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1903645] Funding Source: National Science Foundation
This study reports on direct measurements of thermal transport through contacts between silver nanowires (AgNWs) with a poly(vinylpyrrolidone) (PVP) interlayer, showing that a PVP layer as thin as 4 nm can significantly increase the total thermal resistance of the contact. The thermal boundary resistance for PVP/silver interfaces could be significantly lower than that between polymer-carbon nanotubes (CNTs). Analysis based on these understandings further show why AgNWs could be more effective nanofillers than CNTs.
Various nanofillers have been adopted to enhance the thermal conductivity of polymer nanocomposites. While it is widely believed that the contact thermal resistance between adjacent nanofillers can play an important role in limiting thermal conductivity enhancement of composite materials, lack of direct experimental data poses a significant challenge to perceiving the effects of these contacts. This study reports on direct measurements of thermal transport through contacts between silver nanowires (AgNWs) with a poly(vinylpyrrolidone) (PVP) interlayer. The results indicate that a PVP layer as thin as 4 nm can increase the total thermal resistance of the contact by up to an order of magnitude, when compared to bare AgNWs, even with a larger contact area. On the other hand, the thermal boundary resistance for PVP/silver interfaces could be significantly lower than that between polymer-carbon nanotubes (CNTs). Analyses based on these understandings further show why AgNWs could be more effective nanofillers than CNTs.
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