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Highly Sensitive and Exceptionally Wide Dynamic Range Detection of Ammonia Gas by Indium Hexacyanoferrate Nanoparticles Using FTIR Spectroscopy
- Manakasettharn, Supone, Takahashi, Akira, Kawamoto, Tohru, Noda, Keiko, Sugiyama, Yutaka, Nakamura, Tohru
- Analytical chemistry 2018 v.90 no.7 pp. 4856-4862
- Fourier transform infrared spectroscopy, ambient temperature, ammonia, ammonium, anions, moieties, nanoparticles
- Ammonia gas is useful but caustic; thus, its concentration is monitored depending on applications. We prepared indium hexacyanoferrate nanoparticles (InHCF-NPs, HCF = [Feᴵᴵ(CN)₆]⁴–) with average diameter around 8 nm by simple reaction at room temperature between In cations and HCF anions, and we found the unique functionality of InHCF-NPs which were capable of highly sensitive (16 ppb) and exceptionally wide range (190000, 16 ppb −0.3%) detection of ammonia gas within 6 min by IR measurements. Slope changes of the IR peak ratio of adsorbed ammonium over CN moieties in the InHCF framework indicated a good log–log linear correlation along gas concentrations, in which a wide dynamic range over 10⁵ was realized for the first time in the field of ammonia gas detection.