標題: | Bromocresol Green/Mesoporous Silica Adsorbent for Ammonia Gas Sensing via an Optical Sensing Instrument |
作者: | Chang, Yu-Chang Bai, Hsunling Li, Shou-Nan Kuo, Chun-Nan 環境工程研究所 Institute of Environmental Engineering |
關鍵字: | ammonia gas;optical sensor;mesoporous silica material;UV-Vis absorbance;bromocresol green dye |
公開日期: | 1-四月-2011 |
摘要: | 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. |
URI: | http://dx.doi.org/10.3390/s110404060 http://hdl.handle.net/11536/9055 |
ISSN: | 1424-8220 |
DOI: | 10.3390/s110404060 |
期刊: | SENSORS |
Volume: | 11 |
Issue: | 4 |
起始頁: | 4060 |
結束頁: | 4072 |
顯示於類別: | 期刊論文 |