Chemically Induced Sintering of Nanoparticles

We have observed solid‐state growth of pre‐existing silver nanoparticles (AgNPs) upon exposure to trace (ppb) concentrations of reactive gases at room temperature. The consequent change in localized surface plasmon resonances alters the visible absorbance of dried, printed sensor spots made from ink...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2019-10, Vol.58 (40), p.14193-14196
Main Authors: Li, Zheng, Suslick, Kenneth S.
Format: Article
Language:English
Subjects:
Acidic oxides
Air pollution
colorimetric sensor arrays
Colorimetry
Dosimeters
Dosimetry
Environmental monitoring
Exposure
Gases
gas–solid reaction
Inks
nanoparticle sensors
Nanoparticles
Organic chemistry
Oxidation
Ozone
Pollutants
Pollution monitoring
Production methods
Sensor arrays
Silver
Sintering
ultrasensitive dosimetry
Vapors
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Summary:We have observed solid‐state growth of pre‐existing silver nanoparticles (AgNPs) upon exposure to trace (ppb) concentrations of reactive gases at room temperature. The consequent change in localized surface plasmon resonances alters the visible absorbance of dried, printed sensor spots made from inks of 10 nm‐AgNPs and provides a novel mechanism for trace detection and dosimetry of reactive gases. Colorimetric sensor arrays based on these AgNP inks offer dosimetric identification of acidic and oxidizing gases and other reactive vapors with limits of detection below ppb levels for 1 h exposures. For an array of AgNP inks with various capping agents, a unique color response pattern is observed for each specific analyte. Excellent discrimination among 11 reactive gases was demonstrated using standard chemometric methods. The chemically induced sintering of NPs paves the way for novel solid‐state sensors for the ultrasensitive detection of reactive gases and their application to the monitoring of trace airborne pollutants. Sintering sensors: The solid‐state growth of pre‐existing silver nanoparticles (AgNPs) upon exposure to trace (ppb) concentrations of reactive gases at room temperature is reported. The consequent change in localized surface plasmon resonances alters the visible absorbance of dried, printed sensor spots made from inks of 10 nm AgNPs and provides a novel mechanism for trace detection and dosimetry of reactive gases.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201908600