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Bromocresol Green/Mesoporous Silica Adsorbent for Ammonia Gas Sensing via an Optical Sensing Instrument
Institute of Environmental Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, Taiwan
* Author to whom correspondence should be addressed.
Received: 20 January 2011; in revised form: 18 March 2011 / Accepted: 18 March 2011 / Published: 6 April 2011
Abstract: A meso-structured Al-MCM-41 material was impregnated with bromocresol green (BG) dye and then incorporated into a UV-Vis DRA spectroscopic instrument for the online detection of ammonia gas. The absorption response of the Al-MCM-41/BG ammonia sensing material was very sensitive at the optical absorption wavelength of 630 nm. A high linear correlation was achieved for ppmv and sub-ppmv levels of ammonia gas. The response time for the quantitative detection of ammonia gas concentrations ranging from 0.25 to 2.0 ppmv was only a few minutes. The lower detection limit achieved was 0.185 ppmv. The color change process was fully reversible during tens of cycling tests. These features together make this mesoporous Al-MCM-41 material very promising for optical sensing applications.
Keywords: ammonia gas; optical sensor; mesoporous silica material; UV-Vis absorbance; bromocresol green dye
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Chang, Y.-C.; Bai, H.; Li, S.-N.; Kuo, C.-N. Bromocresol Green/Mesoporous Silica Adsorbent for Ammonia Gas Sensing via an Optical Sensing Instrument. Sensors 2011, 11, 4060-4072.
Chang Y-C, Bai H, Li S-N, Kuo C-N. Bromocresol Green/Mesoporous Silica Adsorbent for Ammonia Gas Sensing via an Optical Sensing Instrument. Sensors. 2011; 11(4):4060-4072.
Chang, Yu-Chang; Bai, Hsunling; Li, Shou-Nan; Kuo, Chun-Nan. 2011. "Bromocresol Green/Mesoporous Silica Adsorbent for Ammonia Gas Sensing via an Optical Sensing Instrument." Sensors 11, no. 4: 4060-4072.