Heat Dissipation of Transparent Graphene Defoggers |
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Authors: | Jung Jun Bae Seong Chu Lim Gang Hee Han Young Woo Jo Dinh Loc Doung Eun Sung Kim Seung Jin Chae Ta Quang Huy Nguyen Van Luan Young Hee Lee |
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Affiliation: | BK21 Physics Division, Department of Energy Science, and Center for Nanotubes and Nanostructured Composites, Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University (SKKU), Suwon 440‐746, Korea |
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Abstract: | 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 × 10?4 W cm?2 °C?1, similar to that of glass (11.1 × 10?4 W cm?2 °C?1) but smaller than that of chromium (17.1 × 10?4 W cm?2 °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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Keywords: | graphene defoggers heat transfer heat dissipation Joule heating |
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