4 years ago

Room-Temperature Dielectric Switchable Nanocomposites

Room-Temperature Dielectric Switchable Nanocomposites
Guoan Cheng, Peng Meng, Zhiyuan Tan, Ruiting Zheng, Xiaoling Wu, Yulong Wu, Quan Zhang
Room-temperature switchable dielectric materials are of interest for many applications, including solar energy storage, smart switches, automatic filters, and next-generation sensors. Here, a temperature-triggered dielectric switchable nanocomposite by dispersing octadecylamine-grafted multiwalled carbon nanotubes (ODA-MWCNTs, for short) into hexadecane is reported. The composite has low permittivity at molten state and high permittivity at frozen state, and the permittivity switch is triggered around 18 °C. The highest permittivity contrast ratio reaches 106.4 at 2.0% CNT volume fraction. The composite shows frequency-sensitive and temperature-ramping-rate-sensitive properties. Further investigation indicates that the permittivity switch is caused by the change of the ODA-MWCNT percolating networks during phase transition. A novel room-temperature dielectric switchable material is obtained by octadecylamine-grafted multiwalled carbon nanotubes (ODA-MWCNTs)/hexadecane composites. The distinct switchable behavior is caused by the microstructure evolution of ODA-MWCNTs when the matrix phase changes. The switch is triggered around 18 °C and the permittivity switching ratio can reach 106.4 times.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adfm.201701136

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