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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
,
1,* , 2
 and
2
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 / Revised: 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 ammonia gas; optical sensor; mesoporous silica material; UV-Vis absorbance; bromocresol green dye
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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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.

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