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Cited 3 time in webofscience Cited 3 time in scopus
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Prominent ethanol sensing with Cr2O3 nanoparticle-decorated ZnS nanorods sensorsopen access

Authors
Sun, Gun-JooKheel, HyejoonKo, Tae-GyungLee, ChongmuKim, Hyoun Woo
Issue Date
Aug-2016
Publisher
KOREAN PHYSICAL SOC
Keywords
Hydrothermal; ZnS; Cr2O3; Gas sensor; Ethanol
Citation
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.69, no.3, pp.390 - 397
Indexed
SCIE
SCOPUS
KCI
Journal Title
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
Volume
69
Number
3
Start Page
390
End Page
397
URI
https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/22274
DOI
10.3938/jkps.69.390
ISSN
0374-4884
Abstract
ZnS nanorods and Cr2O3 nanoparticle-decorated ZnS nanorods were synthesized by using facile hydrothermal techniques, and their ethanol sensing properties were examined. X-ray diffraction and scanning electron microscopy revealed good crystallinity and size uniformity for the ZnS nanorods. The Cr2O3 nanoparticle-decorated ZnS nanorod sensor showed a stronger response to ethanol than the pristine ZnS nanorod sensor. The responses of the pristine and the decorated nanorod sensors to 200 ppm of ethanol at 300 au broken vertical bar C were 2.9 and 13.8, respectively. Furthermore, under these conditions, the decorated nanorod sensor showed a longer response time (23 s) and a shorter recovery time (20 s) than the pristine one did (19 and 35 s, respectively). Consequently, the total sensing time of the decorated nanorod sensor (42 s) was shorter than that of the pristine one (55 s). The decorated nanorod sensor showed excellent selectivity to ethanol over other volatile organic compound gases including acetone, methanol, benzene, and toluene whereas the pristine one failed to show selectivity to ethanol over acetone. The improved sensing performance of the decorated nanorod sensor is attributed to a modulation of the width of the conduction channel and the height of the potential barrier at the ZnS-Cr2O3 interface accompanying the adsorption and the desorption of ethanol gas, and the greater surface-to-volume ratio of the decorated nanorods which was greater than that of the pristine one due to the existence of the ZnS-Cr2O3 interface.
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