Jump to main content
Jump to site search

Issue 4, 2015
Previous Article Next Article

A colorimetric nitrite detection system with excellent selectivity and high sensitivity based on Ag@Au nanoparticles

Author affiliations

Abstract

Excessive uptake of NO2 is detrimental to human health, but the currently available methods used to sensitively detect this ion in the environment are cumbersome and expensive. In this study, we developed an improved NO2 detection system based on a redox etching strategy of CTAB-stabilized Ag–Au core–shell nanoparticles (Ag@AuNPs). The detection mechanism was verified by UV-Vis spectroscopy, TEM and XPS. The detection system produces a color change from purple to colorless in response to an increase of NO2 concentration. The selectivity of detection of NO2, both with the unaided eye and by measurement of UV-Vis spectra, is excellent in relation to other ions, including Cu2+, Co2+, Ni2+, Cr3+, Al3+, Pb2+, Cd2+, Ca2+, Ba2+, Zn2+, Mn2+, Mg2+, Fe3+, Hg2+, Ag+, K+, F, PO43−, C2O42−, SO32−, CO32−, SO42−, NO3 and CH3–COO (Ac). The limit of detection (LOD) for NO2 is 1.0 μM by eye and 0.1 μM by UV-Vis spectroscopy. The LOD by eye is lower than the lowest previously reported value (4.0 μM). There is a good linear relationship between A/A0 and the concentration of NO2 from 1.0 to 20.0 μM NO2, which permits a quantitative assay. The applicability of our detection system was also verified by analysis of NO2 in tap water and lake water. The results demonstrate that our Ag@AuNP-based detection system can be used for the rapid colorimetric detection of NO2 in complex environmental samples, with excellent selectivity and high sensitivity.

Graphical abstract: A colorimetric nitrite detection system with excellent selectivity and high sensitivity based on Ag@Au nanoparticles

Back to tab navigation

Supplementary files

Publication details

The article was received on 28 Aug 2014, accepted on 13 Dec 2014 and first published on 15 Dec 2014


Article type: Paper
DOI: 10.1039/C4AN01583E
Citation: Analyst, 2015,140, 1076-1081
  •   Request permissions

    A colorimetric nitrite detection system with excellent selectivity and high sensitivity based on Ag@Au nanoparticles

    T. Li, Y. Li, Y. Zhang, C. Dong, Z. Shen and A. Wu, Analyst, 2015, 140, 1076
    DOI: 10.1039/C4AN01583E

Search articles by author

Spotlight

Advertisements