可拉伸石墨烯與量子點複合材料光感測器之特性研究

Abstract

可拉伸式裝置被廣泛應用在可變形電子元件、醫學研究與人機互動科技上。本篇論文主要研究由化學氣相沉積法製得之石墨烯與樹葉提煉之石墨烯量子點製作於薄膜波浪狀聚二甲基矽氧烷之可拉伸式光感測元件，此元件具有高度的可拉伸性與對325 nm波長紫外光雷射的高靈敏度。由於二維石墨烯本身的高度可彎曲性質，我們可以利用這種獨特的波浪狀結構來避免掉石墨烯本身的拉伸限制，而將拉伸轉變為彎曲，此方法可以讓石墨烯製作之光感測元件拉伸率高達百分之二十五，並且保留本身的高感光特性。其特殊的表面波浪結構可以利用光的多重反射與穿透作用進而達到增加光靈敏度的功效。此種石墨烯可拉伸式電子元件所具有的穩定電性勢必對未來產業就有所貢獻，其在可拉伸裝置上的應用可以彌補原本僵硬的半導體裝置缺陷，並且對於未來科技有革命性的發展。

Herein, we demonstrate a highly stretchable and sensitive photodetector based on hybrid composite consisting of graphene and graphene quantum dots (GQDs). A unique rippled structure of PDMS is used to support the graphene layer, which can be stretched under external strain far beyond all published reports. The ripple of the device can overcome the native stretchability limit of graphene, but also enhance the carrier generation in GQDs due to multiple reflections of photons between the ripples. We believe our strategy presented here can pave an effective way to many other material systems for designing stretchable electronic and optical devices, including other two-dimensional materials. Stretchable devices possess a great potential in a wide range of application, such as bio-medical, wearable gadget, and smart skin, which can be integrated with human body and penetrate into our daily life.