Fast detection of hydrogen sulfide gas in the ppmv range with silver nanoparticle films at ambient conditions
| Autor: | Hannah R. Morris, Paul M. Whitmore, Rui Chen |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Chemistry
Hydrogen sulfide First-order reaction Inorganic chemistry Metals and Alloys Analytical chemistry Condensed Matter Physics Chemical reaction Silver nanoparticle Surfaces Coatings and Films Electronic Optical and Magnetic Materials Chemical kinetics Reaction rate Ammonia chemistry.chemical_compound Materials Chemistry Electrical and Electronic Engineering Absorption (chemistry) Instrumentation |
| Zdroj: | Sensors and Actuators B: Chemical. 186:431-438 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2013.05.075 |
| Popis: | Based on the chemical reaction of silver nanoparticles (Ag NPs) with hydrogen sulfide (H 2 S), an optical sensor to detect H 2 S gas at room temperature was designed. Peak intensity of localized surface plasmon resonance (LSPR) absorption of Ag NPs was monitored as the sensor responded to H 2 S. The fabricated Ag NP films were very sensitive to the presence of H 2 S with a gas concentration in the parts per million by volume (ppmv) range. The reaction of H 2 S on silver nanoparticle surfaces proceeded very quickly, as indicated by a significant and rapid decrease in the peak absorbance of LSPR. From analysis of the reaction kinetics, the initial reaction between Ag NPs and H 2 S gas was revealed to be a first-order reaction in Ag, and the initial reaction rate was proportional to the gas concentration in the ppmv range. The H 2 S gas concentration can be determined from either the initial reaction rate or from the H 2 S dose measured after extended reaction periods. Performance of the Ag NP film as a dosimeter at ambient conditions was evaluated by exposure to H 2 S in air, to water vapor with different relative humidity, to ammonia, to hydrochloric acid and to some volatile organic compound vapors. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect