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Issue 4, 2021
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Three-dimensional porous SERS powder for sensitive liquid and gas detections fabricated by engineering dense “hot spots” on silica aerogel

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Abstract

A three-dimensional porous SERS powder material, Ag nanoparticles-engineered-silica aerogel, was developed. Utilizing an in situ chemical reduction strategy, Ag nanoparticles were densely assembled on porous aerogel structures, thus forming three-dimensional “hot spots” distribution with intrinsic large specific surface area and high porosity. These features can effectively enrich the analytes on the metal surface and provide huge near field enhancement. Highly sensitive and homogeneous SERS detections were achieved not only on the conventional liquid analytes but also on gas with the enhancement factor up to ∼108 and relative standard deviation as small as ∼13%. Robust calibration curves were obtained from the SERS data, which demonstrates the potential for the quantification analysis. Moreover, the powder shows extraordinary SERS stability than the conventional Ag nanostructures, which makes long term storage and convenient usage feasible. With all of these advantages, the porous SERS powder material can be extended to on-site SERS “nose” applications such as liquid and gas detections for chemical analysis, environmental monitoring, and anti-terrorism.

Graphical abstract: Three-dimensional porous SERS powder for sensitive liquid and gas detections fabricated by engineering dense “hot spots” on silica aerogel

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Supplementary files

Article information


Submitted
11 Oct 2020
Accepted
30 Nov 2020
First published
08 Dec 2020

This article is Open Access

Nanoscale Adv., 2021,3, 1012-1018
Article type
Paper

Three-dimensional porous SERS powder for sensitive liquid and gas detections fabricated by engineering dense “hot spots” on silica aerogel

L. Yang, Z. Ren, M. Zhang, Y. Song, P. Li, Y. Qiu, P. Deng and Z. Li, Nanoscale Adv., 2021, 3, 1012
DOI: 10.1039/D0NA00849D

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