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Preparation of Barium Stannate nanowires for CO2 gas sensor
최조영,박기륭,김희택 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
The need to detect CO2 gas is increasing with increasing the environmental concerns. To date, IR absorption detectors and MS are mainly used for sensing carbon dioxide gas, however these are required a high maintenance costs. In contrast, electrochemical sensors can be produced at low cost however their preparations are complicated and vulnerable to humidity interference. The present study was attempted to overcome these weaknesses by preparing BaSnO3 nanowire (BSO NW) with outstanding gas sensing properties. The perovskite crystal structure of the BSO facilitates this materials to exhibit high CO2 gas sensing performance. Indeed, the high specific surface area and improved porous structure of BSO NW sensor increased its sensitivity toward CO2 sensing. The properties of the gas sensor was examined by scanning electron microscopy (SEM), X-Ray diffraction (XRD), thermal gravimetric analysis (TGA) and resistance test device.
CO<sub>2</sub> gas sensing by BaSnO<sub>3</sub> nanofibers with significant sensitivity change
최조영,박기륭,박성수,좌용호,김희택 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
The need to detect a CO<sub>2</sub> gas is greatly increase with a growth of environmental concerns. A BaSnO<sub>3</sub> (barium stannate) is a promising material to detect the CO<sub>2</sub> with a large detecting range. A BaSnO<sub>3</sub> nanofiber sensor was successfully fabricated via electrospinning. By introducing a nanoscale, we can obtain a crystallization temperature reduction and a high specific surface area. Significant sensitivity was obtained when sensor was exposed to 10,000 ppm CO<sub>2</sub> at 350°C due to a high specific surface area. The maximum sensitivity was reached to 1.95. However, a recovery and a response time take 60 sec and 150 sec respectively. To reduce a recovery and a response time, adding dopants to form a p-n junction will be performed in a future work. The characterizations of the BaSnO<sub>3</sub> were done by X-ray diffraction spectroscopy (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and UV-vis spectroscopy.
Synthesis of barium stannate nanowires for CO₂ gas detecting
최조영,박기륭,박성수,김희택 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
The need to detect CO2 gas is increasing with the increase in environmental concerns. Infrared absorption detectors, gas chromatography (GC) and mass spectrometers (MS) are mainly used for sensing carbon dioxide gas until now. However these equipments require a high maintenance costs. Because of a CO2 gas chemical stability only few materials like barium titanate (BaTiO3), tin oxide (SnO2) and barium stannate (BaSnO3) can sense moderate signal through the chemical or mechanical reaction. Among these materials, barium stannate is the most promising material to detect CO2. It can be applied in a wide range of CO2 concentration than existing materials. We report the fabrication of a barium stannate nano-wire through an electrospinning method. Introducing nano scale and nano wire, we can obtain a high specific surface area. In addition to that it can be mixed with another dopants to enhance a sensing signal and selectivity. The characterization of the sensor was done by XRD, SEM, and TGA.