二氧化錫奈米線及石墨烯的奈米複合結構： 一種對於高效能發光的嶄新方法

Abstract

光致螢光的增強與隨機雷射已經藉由二氧化錫奈米線及石墨烯的奈米複合結構在此實驗中獲得證實。雖然二氧化錫奈米線的直接能隙並不能直接量測到發光，但藉由在二氧化錫奈米線及石墨烯的奈米複合結構，不僅可觀測到直接能隙的發光，更可觀測到大幅度的光致螢光增強及隨機雷射。而其機制是藉由二氧化錫奈米線表面起伏引起的石墨烯表面電漿與二氧化錫奈米線直接能隙躍遷的耦合。我們的研究不僅提供了新一代的高效能半導體光電材料，也開啟了對二維結構石墨烯的應用。

Giant enhancement of light emission and laser action have been demonstrated in the new composites consisting of SnO2 nanowires and graphene nanoflakes (GNFs). Quite surprisingly, even the band edge emission is undetectable in the pristine SnO2 nanowires, but it can be greatly enhanced and the laser action can be achieved in GNFs/SnO2 nanowires composites. The underlying mechanism is attributed to the resonant coupling between the surface plasmon of graphene induced by the surface corrugation and the band edge transition of SnO2 nanowires. Our approach shown here not only paves an excellent alternative for the generation of high-efficiency semiconductor optoelectronic devices, but also opens up a new avenue for the application of two-dimensional graphene crystal.