Reduced graphene oxide (rGO) has attracted interest in its potential application in large area photodetectors owing to its ease of manufacture and wideband optical absorbance. Here, we report that thin rGO films produced via vacuum filtration of GO followed by reduction by immersion in L-ascorbic acid are capable of sensing light through a bolometric mechanism. The photoresponse of these rGO thin films can be further enhanced by dropcasting graphene quantum dots (GQDs) on the rGO surface. These GQDs were observed to increase the opacity of the rGO film and hence its absorptivity of light, thereby enabling a significant increase in the photoresponse of the device.

由于其易于制造和宽带光吸收，还原氧化石墨烯（rGO）在大面积光电探测器中的潜在应用引起了人们的兴趣。在这里，我们报告说，通过真空过滤 GO 然后通过浸入 L-抗坏血酸中还原产生的薄 rGO 薄膜能够通过辐射热机制感测光。通过在 rGO 表面滴铸石墨烯量子点 (GQD)，可以进一步增强这些 rGO 薄膜的光响应。观察到这些 GQD 增加了 rGO 薄膜的不透明度，从而增加了它的光吸收率，从而显着增加了器件的光响应。