Bromocresol green/mesoporous silica adsorbent for ammonia gas sensing via an optical sensing instrument

Yu Chang Chang, Hsun-Ling Bai*, Shou Nan Li, Chun Nan Kuo

*Corresponding author for this work

Research output: Contribution to journalArticle

36 Scopus citations

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.

Original languageEnglish
Pages (from-to)4060-4072
Number of pages13
JournalSensors
Volume11
Issue number4
DOIs
StatePublished - 1 Apr 2011

Keywords

  • Ammonia gas
  • Bromocresol green dye
  • Mesoporous silica material
  • Optical sensor
  • UV-Vis absorbance

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