title: Bromocresol green/mesoporous silica adsorbent for ammonia gas sensing via an optical sensing instrument.
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.
authors.affiliation: Institute of Environmental Engineering, National Chiao Tung University, Hsinchu, Taiwan. bruce0313@gmail.com
authors.forename: Yu-Chang
authors.initials: YC
authors.lastname: Chang
authors.forename: Hsunling
authors.initials: H
authors.lastname: Bai
authors.forename: Shou-Nan
authors.initials: SN
authors.lastname: Li
authors.forename: Chun-Nan
authors.initials: CN
authors.lastname: Kuo
mesh_terms: D000641:Ammonia / Q000032:analysis*; D001961:Bromcresol Green / Q000737:chemistry*; D005740:Gases / Q000032:analysis*; D006801:Humans; D012822:Silicon Dioxide / Q000737:chemistry; D013057:Spectrum Analysis / Q000379:methods
chemical_list: D005740:Gases; D012822:Silicon Dioxide; D000641:Ammonia; D001961:Bromcresol Green