Ultrasensitive room-temperature ethanol detection based on Au functionalized nanoporous SnO2/C60/SnO2 composites. Issue 85 (23rd November 2017)

• Record Type: Journal Article
• Authors: Shao, Shaofeng; Wang, Wei; Chen, Yunyun; Wang, Yunfei; Koehn, Ralf
• Is Part Of: RSC advances. Volume 7:Issue 85(2017)
• Page Start: 53925
• Page End: 53931
• Publication Date: 2017-11-23
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7ra11021a
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : An Au functionalized nanoporous SnO2 /C60 /SnO2 gas sensor exhibits an extremely sensitive, selective sub-ppm level ethanol gas detection at room temperature. Abstract : We have realized extremely sensitive, selective sub-ppm level ethanol gas detection through an Au functionalized nanoporous SnO2 /C60 /SnO2 sensing composite. This new type of hierarchically nanoporous SnO2 composite film supports both the Au@SnO2 /C60 layer with closely packed open macropores (∼300 nm) and the bottom SnO2 layer with highly ordered nanopores (8–10 nm). The structure, crystallinity and composition of the hierarchical structured Au@SnO2 /C60 /SnO2 nanocomposite films are characterized by XRD, Raman, HRTEM, and SAED. The interaction between the Au/SnO2 and C60 /SnO2 heterojunctions in light of transfer of charge carriers and modulation of potential barriers plays a crucial role in enhancing the detecting performance. The sensing properties of the Au@SnO2 /C60 /SnO2 nanocomposite sensor are investigated by exposing it to ethanol gas with a concentration range from 0.5 ppm to 50 ppm. Furthermore, the gas sensor exhibits ultrahigh sensitivity to ethanol gas with a response value of up to 16.8 at 0.5 ppm and a short recovery time of 9 seconds at room temperature.