期刊
ADVANCED FUNCTIONAL MATERIALS
卷 22, 期 22, 页码 4819-4826出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201201155
关键词
graphene; defoggers; heat transfer; heat dissipation; Joule heating
类别
资金
- Technology Innovation Program [10039486]
- Ministry of Knowledge Economy (MKE, Korea)
- Star Faculty program of the National Research Foundation of Korea (NRF) [2010-0029653]
- World Class University (WCU) program of the National Research Foundation of Korea (NRF) [R31-2008-10029]
- Ministry of Education, Science and Technology (MEST) of Korea
In spite of recent successful demonstrations of flexible and transparent graphene heaters, the underlying heat-transfer mechanism is not understood due to the complexity of the heating system. Here, graphene/glass defoggers are fabricated and the dynamic response of the temperature as a function of input electrical power is measured. The graphene/glass defoggers reveal shorter response times than Cr/glass defoggers. Furthermore, the saturated temperature of the graphene/glass defoggers is higher than for Cr/glass defoggers at a given input electrical power. The observed dynamic response to temperature is well-fitted to the power-balance model. The response time of graphene/glass defogger is shorter by 44% than that of the Cr/glass defogger. The convective heat-transfer coefficient of graphene is 12.4 x 10-4 W cm-2 degrees C-1, similar to that of glass (11.1 x 10-4 W cm-2 degrees C-1) but smaller than that of chromium (17.1 x 10-4 W cm-2 degrees C-1). The graphene-based system reveals the lowest convective heat-transfer coefficient due to its ideal flat surface compared to its counterparts of carbon nanotubes (CNTs) and reduced graphene oxide (RGO)-based systems.
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