Sensors 2011, 11(4), 4060-4072; doi:10.3390/s110404060
Article

Bromocresol Green/Mesoporous Silica Adsorbent for Ammonia Gas Sensing via an Optical Sensing Instrument

1 Institute of Environmental Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan 2 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
(This article belongs to the Special Issue Direct and Indirect Sensing of Odor and VOCs and Their Control)
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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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MDPI and ACS Style

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.

AMA Style

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.

Chicago/Turabian Style

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.

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