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A Volatile Organic Compound Sensor Using Porous Co3O4 Spheres
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 Title & Authors
A Volatile Organic Compound Sensor Using Porous Co3O4 Spheres
Kim, Tae-Hyung; Yoon, Ji-Wook; Lee, Jong-Heun;
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Porous spheres with bimodal pore distribution (size: 2-3 nm and ~ 30 nm) were prepared by ultrasonic spray pyrolysis of aqueous droplets containing Co-acetate and polyethylene glycol (PEG), while dense secondary particles with monomodal pore distribution (size: 2-3 nm) were prepared from the spray solution without PEG. The formation of mesopores (~ 30 nm) was attributed to the decomposition of PEG. The responses of a porous sensor to various indoor air pollutants such as 5 ppm , xylene, toluene, benzene, and HCHO at were found to be significantly higher than those of a commercial sensor using and dense secondary particles. Enhanced gas response of porous sensor was attributed to high surface area and the effective diffusion of analyte gas through mesopores (~ 30 nm). Highly sensitive porous sensor can be used to monitor various indoor air pollutants.
Gas sensor;;Volatile organic compound;Spray pyrolysis;
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