1. Integration of quantum dots with Zn 2 GeO 4 nanoellipsoids to expand the dynamic detection range of uranyl ions in fluorescent test strips.
- Author
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Zhang J, Hou J, Zhang K, Zhang R, Geng J, Wang S, and Zhang Z
- Subjects
- Colorimetry, Fluorescent Dyes chemistry, Ions, Water, Zinc, Quantum Dots chemistry
- Abstract
Fluorescent colorimetric test strips normally have a narrow dynamic detection-range due to the limited responsive range from single responsive materials, which cannot meet the wide detection requirement in practical applications. Herein, we developed an approach to detect uranyl ions (UO
2 ) with a broad detection range using the synthesized ZnS:Mn quantum dots (QDs) modified Zn2+ ) with a broad detection range using the synthesized ZnS:Mn quantum dots (QDs) modified Zn2 GeO4 nanoellipsoids (Zn2 GeO4 @ZnS:Mn NEs), containing two responsive materials with the opposite signal responses at different UO2 2+ concentrations. Specifically, a red to chocolate color change was observed at low analyte concentrations (0.01-100 μM) resulting from the photoinduced electron transfer effect from ZnS:Mn QDs to UO2 2+ . A sequentially olive drab to green color change has been observed when further increasing the UO2 2+ concentration (100-1000 μM) as a result of the antenna effect between Zn2 GeO4 nanoellipsoids and UO2 2+ . In addition, a low-cost and portable fluorescent test strip has been further fabricated through embedding Zn2 GeO4 @ZnS:Mn NEs on a microporous structure membrane, demonstrating a facile yet effective colorimetric response to UO2 2+ in lab water, lake water, and seawater with a wide dynamic range. Therefore, it is potentially attractive for real-time and on-site detection of UO2 2+ in sudden-onset situations., (Copyright © 2022 Elsevier B.V. All rights reserved.)- Published
- 2022
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