Label-free upconversion nanosensor for water safety monitoring of permanganate and dichromate ions.

ABSTRACT: Water contaminated with heavy metal ions poses serious threat to the human health and environment protection. It is imperative to develop analytical tools to detect heavy metal ions. Herein, we propose autofluorescence free SiO₂ modified upconversion nanosensor for label-free and fast determination of MnO₄^- and Cr₂O₇^2- anions. The highly efficient and multi-colour upconversion luminescence (UCL) of UCNPs@SiO₂ was effectively quenched by MnO₄^- and Cr₂O₇^2- anions with fast response time of 2 and 1 min, respectively. The UCNPs@SiO₂ nanosensor exhibits linear detection ranges of 0.6-2000, 2-2000 µM with the LOD at 0.15, 0.04 µM for MnO₄^-

SUBMITTER: Xu K 

PROVIDER: S-EPMC11883987 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature