TY - JOUR
T1 - Microstructure control of TiO2 nanotubular films for improved VOC sensing
AU - Seo, Min Hyun
AU - Yuasa, Masayoshi
AU - Kida, Tetsuya
AU - Huh, Jeung Soo
AU - Yamazoe, Noboru
AU - Shimanoe, Kengo
N1 - Funding Information:
This study was supported by NISSAN Science Foundation, by a Grant-in-Aid for Exploratory Research (No. 19659402 ) from the Ministry of Education, Culture, Sports, Science and Technology of Japan , by Joint Research Project between Japan and Korea of Japan Society for the Promotion of Science (JSPS), and by Environmental Research and Technology Development Fund from the Ministry of Environment of Japan .
PY - 2011/6/20
Y1 - 2011/6/20
N2 - Porous gas sensing films composed of TiO2 nanotubes were fabricated for the detection of volatile organic compounds (VOCs), such as alcohol and toluene. In order to control the microstructure of TiO2 nanotubular films, ball-milling treatments were used to shorten the length of TiO2 nanotubes and to improve the particle packing density of the films without destroying their tubular morphology and crystal structure. The ball-milling treatment successfully modified the porosity of the gas sensing films by inducing more intimate contacts between nanotubes, as confirmed by scanning electron microscopy (SEM) and mercury porosimetry. The sensor using nanotubes after the ball-milling treatment for 3 h exhibited an improved sensor response and selectivity to toluene (50 ppm) at the operating temperature of 500 °C. However, an extensive ball-milling treatment did not enhance the original sensor response, probably owing to a decrease in the porosity of the film. The results obtained indicated the importance of the microstructure control of sensing layers in terms of particle packing density and porosity for detecting large sized organic gas molecules.
AB - Porous gas sensing films composed of TiO2 nanotubes were fabricated for the detection of volatile organic compounds (VOCs), such as alcohol and toluene. In order to control the microstructure of TiO2 nanotubular films, ball-milling treatments were used to shorten the length of TiO2 nanotubes and to improve the particle packing density of the films without destroying their tubular morphology and crystal structure. The ball-milling treatment successfully modified the porosity of the gas sensing films by inducing more intimate contacts between nanotubes, as confirmed by scanning electron microscopy (SEM) and mercury porosimetry. The sensor using nanotubes after the ball-milling treatment for 3 h exhibited an improved sensor response and selectivity to toluene (50 ppm) at the operating temperature of 500 °C. However, an extensive ball-milling treatment did not enhance the original sensor response, probably owing to a decrease in the porosity of the film. The results obtained indicated the importance of the microstructure control of sensing layers in terms of particle packing density and porosity for detecting large sized organic gas molecules.
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U2 - 10.1016/j.snb.2010.01.069
DO - 10.1016/j.snb.2010.01.069
M3 - Article
AN - SCOPUS:79955672208
SN - 0925-4005
VL - 154
SP - 251
EP - 256
JO - Sensors and Actuators B: Chemical
JF - Sensors and Actuators B: Chemical
IS - 2
ER -