Highly sensitive colorimetric determination of nitrite based on the selective etching of concave gold nanocubes

Title
Highly sensitive colorimetric determination of nitrite based on the selective etching of concave gold nanocubes
Authors
이강봉이연희남윤식김진영이지영윤수진
Keywords
Nitrite ion sensor; Concave gold nanocubes; Etching; Colorimetric probe; Surface plasmon resonance
Issue Date
2021-03
Publisher
Microchimica Acta
Citation
VOL 188, NO 132-11
Abstract
Concave gold nanocubes are viable optical nanoprobes for the determination of nitrite ions. Herein, a novel approach was developed, based on the measurement of localized surface plasmon resonance absorption. The addition of nitrite ions selectively induced the etching of concave gold nanocubes, abrading the sharp vertices to spherical corners, which resulted in blue-shifted absorption accompanied by a color change from sapphire blue to light violet. The mechanism of selective etching of concave gold nanocube tips was elucidated by using X-ray photoelectron spectroscopy and atom probe tomography. The optimized detection of NO2? via the concave gold nanocube-based probe occurred at pH 3.0 and in 20 mM NaCl concentration at 40 °C. The absorption ratios (A550 nm/A640 nm) were proportional to the NO2? concentrations in the range 0.0?30 μM, with a detection limit of 38 nM (limit of quantitation of 0.12 μM and precision of 2.7%) in tap water. The highly selective and sensitive colorimetric assay has been successfully applied to monitor the nitrite ion concentrations in spiked tap water, pond water, commercial ham, and sausage samples.
URI
http://pubs.kist.re.kr/handle/201004/72974
ISSN
0026-3672
Appears in Collections:
KIST Publication > Article
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