Issue 24, 2021

Colorimetric detection of water content in organic solvents via a smartphone with fluorescent Ag nanoclusters

Abstract

We detected the water content in ethanol and dimethyl sulfoxide (DMSO) solvents via a smartphone with the help of fluorescent Ag nanoclusters (Ag NCs). The Ag NCs intrinsically have two emission peaks, among which the long-wavelength emission intensified with decreasing water content due to the aggregation induced emission enhancement (AIEE) effect, but in contrast the short-wavelength emission was relatively insensitive to water content. This fact makes the Ag NCs an ideal colorimetric indicator of water content in organic solvents. A smartphone was applied to take pictures of Ag NC samples and read the R, G, and B values from the images. When the water content increased from 20% to 55% in ethanol, the G/B values displayed a good linear relationship with the water content, and a limit of detection (LOD) of 4.48% was achieved. Moreover, good consistency was observed when the colorimetric fluorescent Ag NCs were applied to detect water content in real samples such as white wine and medical alcohol. These studies demonstrated a convenient and practical method for the detection of water content via a smartphone.

Graphical abstract: Colorimetric detection of water content in organic solvents via a smartphone with fluorescent Ag nanoclusters

Supplementary files

Article information

Article type
Paper
Submitted
24 Mar 2021
Accepted
17 May 2021
First published
17 May 2021

Anal. Methods, 2021,13, 2722-2727

Colorimetric detection of water content in organic solvents via a smartphone with fluorescent Ag nanoclusters

N. Kong, H. Yuan, H. Zhou, Y. Zhao and S. Zhang, Anal. Methods, 2021, 13, 2722 DOI: 10.1039/D1AY00497B

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