Enhancement of H2S sensing performance of p-CuO nanofibers by loading p-reduced graphene oxide nanosheets

•For gas sensing, RGO loaded CuO NFs were produced by electrospinning method and subsequent heating.•0.5 wt% RGO loaded CuO NFs sensor had the maximum response to H2S gas.•Underlying sensing mechanism is discussed. Being compared to p-n heterojunctions, less attention has been paid to p-p heterojunc...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2019-02, Vol.281, p.453-461
Main Authors: Kim, Jae-Hun, Mirzaei, Ali, Zheng, Yifang, Lee, Jae-Hyoung, Kim, Jin-Young, Kim, Hyoun Woo, Kim, Sang Sub
Format: Article
Language:English
Subjects:
Copper oxides
Copper sulfides
CuO
Detection
Gas sensors
Gases
Graphene
H2S
Heterojunctions
Hydrogen sulfide
Morphology
Nanofiber
Nanofibers
Nanosheets
P-n junctions
Reduced graphene oxide
Selectivity
Sensing mechanism
Sensitivity
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Summary:•For gas sensing, RGO loaded CuO NFs were produced by electrospinning method and subsequent heating.•0.5 wt% RGO loaded CuO NFs sensor had the maximum response to H2S gas.•Underlying sensing mechanism is discussed. Being compared to p-n heterojunctions, less attention has been paid to p-p heterojunctions for gas sensing studies. Motivated by this fact, herein, gas sensing characteristics of p-reduced graphene oxide (RGO) loaded p-CuO nanofibers (NFs) will be presented. In order to find the optimal value of RGO loading, different amounts of RGO (0.05–1.5 wt%) were added to the electrospun CuO NFs. The results of sensing tests showed that the CuO-0.5 wt% RGO has the best sensitivity to H2S at 300 °C. Also, low response to the interfering gases demonstrated the good selectivity of the optimal sensor towards H2S. Underlying sensing mechanism is discussed in details. High response of CuO-0.5 wt% RGO sensor towards H2S was related to NF morphology, presence of RGO, high intrinsic sensitivity of CuO towards H2S gas, presence of a lot of CuO nanograins along with the existence of the plenty of p-p heterojunctions, which will be changed by transformation of CuO to CuS. The results of present study can be used for design and fabrication of novel RGO containing p-p heterojunction gas sensors.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2018.10.144