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Title: Synthesis of photoluminescent carbon dots for the detection of cobalt ions
Authors: Chi-Lin Li;Chih-Ching Huang;Arun Prakash Periasamy;Prathik Roy;Wei-Cheng Wu;Chia-Lun Hsua;Huan-Tsung Chang
Contributors: 國立臺灣海洋大學:生命科學暨生物科技學系
Date: 2015
Issue Date: 2016-09-07T02:02:51Z
Publisher: RSC Advances
Abstract: Abstract: We have developed a simple assay for the sensing of cobalt ions (Co2+), based on the analyte induced photoluminescence (PL) quenching of carbon dots (C-dots). The C-dots (mean diameter 3.6 ± 0.3 nm) prepared from L-cysteine through a simple hydrothermal process at 300 °C for 2 h have a quantum yield of 13.2%. The C-dots have strong blue PL with a maximum PL intensity at 395 nm under an excitation wavelength of 325 nm. Through the reactions of Co2+ ions with cysteine molecules/residues on the surfaces of the C-dots, non-photoluminescent CoxSy nanoparticles are formed. As-formed CoxSy nanoparticles and the C-dots further form aggregates in the solution, leading to PL quenching. The C-dot probe allows detection of Co2+ ions over a concentration range from 10 nM to 100 μM (R2 = 0.992). This reliable, rapid, sensitive, and selective C-dot probe has been utilized for the determination of the concentrations of Co2+ ions in vitamin B12 and natural water samples.
Relation: 3
Appears in Collections:[Department of Life Science] Periodical Articles

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