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실내 대기질 진단을 위한 금속산화물 기반 폼알데하이드 가스센서 연구 동향
김윤화,김일두,구원태,장지수 한국센서학회 2019 센서학회지 Vol.28 No.6
People currently spend more than 80% of their time indoors; therefore, the management of indoor air quality has become an important issue. The contamination of indoor air can cause sick house syndrome and various environmental diseases such as atopy and nephropathy. Formaldehyde gas, which is the main contaminant of indoor air, is lethal even with microscopic exposure; however, it is commonly used as an adhesive and waterproofing agent for indoor building materials. Therefore, there is a need for a gas sensor capable of detecting trace amounts of formaldehyde gas. In this review, we summarize recent studies on metal oxide-based semiconductor gas sensors for formaldehyde gas detection, methods to improve the gas-sensing properties of metal oxides of various dimensions, and the effects of catalysts for the detection of parts-per-billion level gases. Through this, we discuss the necessary characteristics of the metal oxidebased semiconductors for gas sensors for the development of next-generation sensors.
고분산성 Cr2O3 및 Co3O4 전이금속 나노입자 촉매가 기능화된 다공성 WO3 나노섬유를 이용한 구취진단용 화학센서
장지수 ( Ji-soo Jang ),김상준 ( Sang-joon Kim ),최선진 ( Seon-jin Choi ),구원태 ( Won-tae Koo ),김일두 ( Il-doo Kim ) 한국센서학회 2016 센서학회지 Vol.25 No.3
In this work, we prepared porous WO3 nanofibers (NFs) functionalized by bio-inspired catalytic Cr2O3 and Co3O4 nanoparticles as highly sensitive and selective H2S gas sensing layers. Highly porous 3-dimensional (3D) NFs networks decorated by well-dispersed catalyst NPs exhibited superior H2S gas response (Rair/Rgas = 46 at 5 ppm) in high humidity environment (95 %RH). In particular, the sensors showed outstanding H2S selectivity against other interfering analytes (such as acetone, toluene, CO, H2, ethanol). Exhaled breath sensors using Cr2O3 and Co3O4 catalysts-loaded WO3 NFs are highly promising for the accurate detection of halitosis.