Doping effects of ZnO quantum dots on the sensitive and selective detection of acetylene for dissolved-gas analysis applications of transformer oil

Doping effects of ZnO quantum dots on the sensitive and selective detection of acetylene for dissolved-gas analysis applications of transformer oil

•We report the doping effect on the sensing properties of ZnO quantum dots for acetylene.•Doping of ZnO quantum dots modified oxygen vacancies and optical band gaps.•In-doped ZnO quantum dots exhibited a better sensing performance to 10 ppm acetylene.•10 ppm acetylene could be selectively detected u...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Vol. 299; p. 126992
Main Authors: Park, Min Sun, Lee, Jun Ho, Park, Yunji, Yoo, Ran, Park, Seungryol, Jung, Hwaebong, Kim, Wonkyung, Lee, Hyun-Sook, Lee, Wooyoung
Format: Journal Article
Language:English
Published: Lausanne Elsevier B.V 15-11-2019
Elsevier Science Ltd
Subjects:
Acetylene
Acetylene gas sensor
Detection
Dissolved gas analysis
Dissolved gases
Doping
Gas analysis
Gas chromatography
Gases
Quantum dots
Transformer oil
Transformers
Zinc oxide
ZnO
Dissolved gas analysis
Acetylene gas sensor
Gas chromatography
ZnO
Quantum dots
Transformer oil
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Summary:•We report the doping effect on the sensing properties of ZnO quantum dots for acetylene.•Doping of ZnO quantum dots modified oxygen vacancies and optical band gaps.•In-doped ZnO quantum dots exhibited a better sensing performance to 10 ppm acetylene.•10 ppm acetylene could be selectively detected using a miniaturized gas chromatography.•The device can detect the major fault gases of hydrogen and acetylene separately within ∼100 s. We report on the doping effect on the sensing properties of ZnO quantum dots (QDs) for the detection of acetylene. We found that In-doped ZnO (IZO) QDs exhibited a better sensing performance to 10 ppm acetylene than undoped ZnO (ZO) QDs and Al-doped ZnO (AZO) QDs. The higher sensing response of IZO QDs can be attributed to a greater number of reactive sites for detecting acetylene, which is likely to originate from the increased number of oxygen vacancies, and the larger optical band gap and surface area of IZO. This is due to a higher valence dopant and a smaller particle size. The sensing properties of IZO QDs to 10 ppm acetylene was also found to be superior to previously reported acetylene sensors that are based on semiconducting metal oxides. Furthermore, we demonstrated that 10 ppm of acetylene can be selectively detected in air within ∼100 s using a recently developed miniaturized gas chromatography (GC) integrated with the IZO QDs sensor. In addition, we found that the device can detect the major fault gases of hydrogen and acetylene separately within ∼100 s. Our study demonstrates that the device can be utilized in the GC-based on-line dissolved gas analysis to detect small amounts of acetylene gas in transformer oil.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2019.126992