Li, Yi-Ting and Lo, Chien Feng and Lin, Kuan-Han and Liao, Pin-Chao and Juan, Joon Ching and Hsiao, Po-Hsuan and Chen, Chia-Yun (2024) Sensitivity improvement of Au-nanoparticle-based colorimetric probes via surface decoration of carbon quantum dots. New Journal of Chemistry, 48 (22). pp. 10053-10059. ISSN 1144-0546, DOI https://doi.org/10.1039/d4nj00640b.
Full text not available from this repository.Abstract
Visually colorimetric sensing of hazardous metallic ions based on gold nanoparticles (AuNPs) has been considered a facile, on-site, and reliable monitoring route, yet the improvement of detection limit, as well as environmental pH tolerance, is still needed. Herein, we present an integrated probe design based on functionalizing AuNP cores with carbon quantum dots (CQD) as colorimetric probes for tracing Cu2+ ions with a limit of detection as low as 18.7 nM. Improved detection selectivity was elucidated with the reduction in thiol groups bound between CQD decorations and AuNP probes initiated by oxidation of Cu2+ ion analytes, thus separating crossly connected probes, depending on tracing Cu2+ concentrations. Moreover, distributed CQDs with negative potentials allowed the stabilization of dispersed AuNPs against re-aggregation, which caused the gradual morphological transition from aggregated features to dispersed states in microscopic view, and eventually, reflected the gradual color change from red to purple-red. The correlated practicality of colorimetric detection of the Cu2+ ion was further validated with sound-sensing selectivity, environmental pH resistance and tests on real samples.
| Item Type: | Article |
|---|---|
| Funders: | Ministry of Science and Technology, Taiwan (MOST 110-2223-E-006-003-MY3), Hierarchical Green-Energy Materials (Hi-GEM) Research Center, and Featured Areas Research Center Program |
| Uncontrolled Keywords: | Plasmon resonance LSPR; Fluorescent detection; Gold nanoparticles; CU2+; Ions; Copper |
| Subjects: | Q Science > Q Science (General) Q Science > QD Chemistry |
| Divisions: | Deputy Vice Chancellor (Research & Innovation) Office > Nanotechnology & Catalysis Research Centre |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 30 Sep 2024 01:56 |
| Last Modified: | 30 Sep 2024 01:56 |
| URI: | http://eprints.um.edu.my/id/eprint/45226 |
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