Sensitive photo-thermal response of graphene oxide for mid-infrared detection. Issue 38 (9th September 2015)

• Record Type: Journal Article
• Authors: Bae, Jung Jun; Yoon, Jung Hyun; Jeong, Sooyeon; Moon, Byoung Hee; Han, Joong Tark; Jeong, Hee Jin; Lee, Geon-Woong; Hwang, Ha Ryong; Lee, Young Hee; Jeong, Seung Yol; Lim, Seong Chu
• Is Part Of: Nanoscale. Volume 7:Issue 38(2015)
• Page Start: 15695
• Page End: 15700
• Publication Date: 2015-09-09
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c5nr04039f
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : The resonant absorption of mid-IR by functional groups and large negative TCR of GO enhance photothermal effect undoubtedly proving that the change of optical conductivity is invoked by the bolometer effect, instead of the photo-electric effect. Abstract : This study characterizes the effects of incident infrared (IR) radiation on the electrical conductivity of graphene oxide (GO) and examines its potential for mid-IR detection. Analysis of the mildly reduced GO (m-GO) transport mechanism near room temperature reveals variable range hopping (VRH) for the conduction of electrons. This VRH behavior causes the m-GO resistance to exhibit a strong temperature dependence, with a large negative temperature coefficient of resistance of approximately −2 to −4% K −1 . In addition to this hopping transport, the presence of various oxygen-related functional groups within GO enhances the absorption of IR radiation significantly. These two GO material properties are synergically coupled and provoke a remarkable photothermal effect within this material; specifically, a large resistance drop is exhibited by m-GO in response to the increase in temperature caused by the IR absorption. The m-GO bolometer effect identified in this study is different from that exhibited in vanadium oxides, which require added gold-black films that function as IR absorbers owing to their limited IR absorption capability.