Journal
ANALYTICAL CHEMISTRY
Volume 90, Issue 7, Pages 4856-4862Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.8b00359
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Funding
- NMRI, AIST, Japan
- NANOTEC, NSTDA, Thailand [P1750113, F216004667]
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Ammonia gas is useful but caustic; thus, its concentration is monitored depending on applications. We prepared indium hexacyanoferrate nanoparticles (InHCF-NPs, HCF = [Fe-II(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 10(5) was realized for the first time in the field of ammonia gas detection.
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