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Issue 12, 2014
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Upconversion nanoparticles for ratiometric fluorescence detection of nitrite

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Abstract

We have developed a selective upconversion switching method for the ratiometric fluorescence detection of nitrite using upconversion nanoparticles (UCNPs) and an efficient nitrite reaction. The green emission (λem = 539 nm) of NaYF4:Yb3+,Er3+ nanoparticles can be selectively quenched by the neutral red (NR) dye due to the spectral overlap between the emission at 539 nm and the absorption of NR, while its red emission (λem = 654 nm) remains unchanged. Nitrite reacts specifically and strongly with NR to form diazonium salt and lose the diazonium group, which sharply decreases the absorption of NR. Thus, the green emission of NaYF4:Yb3+,Er3+ can be recovered by increasing the amount of nitrite, leading to visible color changes from red to orange-yellow and finally green under excitation at 980 nm. The increase in the ratio of emission intensities (I539/I654) is quantitatively correlated to the concentration of nitrite ions. Moreover, the developed method has been successfully applied to nitrite detection in real samples such as drinking water, natural water and meat foods. In particular, the upconversion sensors can efficiently avoid background optical interference and thus show potential for the detection of nitrite salts in complex samples.

Graphical abstract: Upconversion nanoparticles for ratiometric fluorescence detection of nitrite

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Article information


Submitted
27 Feb 2014
Accepted
10 Apr 2014
First published
10 Apr 2014

Analyst, 2014,139, 3032-3038
Article type
Paper
Author version available

Upconversion nanoparticles for ratiometric fluorescence detection of nitrite

J. Han, C. Zhang, F. Liu, B. Liu, M. Han, W. Zou, L. Yang and Z. Zhang, Analyst, 2014, 139, 3032
DOI: 10.1039/C4AN00402G

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