Lee, Jun Ho Park, Min Sun Jung, Hwaebong Choe, Yong-Sahm Kim, Wonkyung Song, Young Geun Kang, Chong-Yun Lee, Hyun-Sook Lee, Wooyoung 2024-01-19T18:01:36Z 2024-01-19T18:01:36Z 2021-09-05 2020-03-15 0925-4005 https://pubs.kist.re.kr/handle/201004/118850 We report on the sensitive and selective sensing properties of SnO2 nanorods (NRs) based gas sensors coupled with a miniature gas chromatography (mini-GC) system for the detection of acetylene. The SnO2 NRs were fabricated by a glancing angle deposition (GLAD) method and their average height and diameter were similar to 200 nm and similar to 30 nm, respectively. In order to overcome a selectivity issue of metal oxide semiconductor gas sensors, we integrated our SnO2 NRs based sensors with a packed column. The device accurately and selectively detected acetylene within 2 min (similar to 120 s). We found that loading a thin layer (5 nm) of metal catalysts such as Au, Pt or Pd increases the sensing abilities of the SnO2 NRs sensors. Among the tested sensors, the Pd-coated SnO2 NRs sensor (Pd-SnO2 NRs) exhibited the best sensing performance for the detection of 10 ppm of acetylene and the lower detection limit of 0.01 ppm. The superior sensing properties of Pd-SnO2 NRs are due to the large amount of oxygen deficiencies on the surface of Pd-SnO2 NRs, which acts as reactive sites. More importantly, the mini-GC device can be used to selectively detect 10 ppm of acetylene from other gases such as H-2. Our findings demonstrate that Pd-SnO2 NRs integrated with a mini-GC device can be utilized to monitor the dissolved acetylene gas in transformer oil in real time. English ELSEVIER SCIENCE SA SENSING PROPERTIES MICROSTRUCTURES ACETONE SYSTEM Selective C2H2 detection with high sensitivity using SnO2 nanorod based gas sensors integrated with a gas chromatography Article 10.1016/j.snb.2019.127598 1 SENSORS AND ACTUATORS B-CHEMICAL, v.307 SENSORS AND ACTUATORS B-CHEMICAL 307 scie scopus 000508110400051 2-s2.0-85077743418 Chemistry, Analytical Electrochemistry Instruments & Instrumentation Chemistry Electrochemistry Instruments & Instrumentation Article SENSING PROPERTIES MICROSTRUCTURES ACETONE SYSTEM Acetylene gas sensor SnO2 nanorod array Metal catalyst Miniaturized gas chromatography Dissolved gas analysis Transformer oil