微波脫層法製備奈米石墨烯片及其散熱之應用

A Facile Approach to Synthesize Graphene Nanosheets Via Microwave Exfoliation for Heat Dissipation Applications

賴怡瑾(Y.J. Lai) ； 劉偉仁(W.R. Liu)

《鑛冶：中國鑛冶工程學會會刊》 61卷1期 (2017/03) Pp. 89-94

https://doi.org/10.30069/MM.201703_61(1).0009

摘要

本研究提出快速且有效製備膨脹石墨的法，主要以微波輔助脫層法製備石墨烯，石墨烯本身是會吸收微波的材料，所以相較於傳統使用高溫熱脫層之方法，可以減少能源的消耗及縮短製備膨脹石墨的時間。由SEM圖可得知經微波處理後形貌如蠕蟲狀般，膨脹體積明顯伴隨瓦數增加而變大，從Raman可以觀察到石墨經插層後其缺陷提升，經過微波處理後插層劑汽化使缺陷從0.42降低為0.052，之後會將不同製備參數的樣品利用混漿塗佈於銅箔上，可透過控制塗佈表面來提升散熱能力，藉由手機與平板電腦設計結構，模擬3C產品與運作過程中散熱狀況，並將製備好的散熱膜進行散熱測試。

關鍵字

石墨烯 ； 膨脹石墨 ； 微波 ； 散熱片

並列摘要

This study aimed to prepare graphene nanosheet (GNS) using a three-step synthesis and to investigate the thermal properties of the prepared GNS. Natural graphite (NG) was intercalated with various intercalating agents to produce graphite intercalated compound (GIC) which was then subjected to microwave-assisted expansion to produce expandable graphite (EG). When compared to that of traditional thermal method (TM), this was a faster and more cost-effective method to produce expandable graphite. The SEM images revealed several expansions on the surface of ＂worm-like＂ graphite. Our test results showed that the prepared expandable graphite had low defect rate (ID / IG 0.052) and high C/O ratio (10.36). MW-EG was physically exfoliated using ultrasonicator for 6 hours to obtain GNS. The prepared GNS were coated onto Cu film to evaluate its thermal properties. GNS provided better heat dissipation than bare Cu film.

並列關鍵字

grapheme ； expanded graphite ； microwave ； dissipation film