期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 389, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2019.112204
关键词
Multiple ions; CDs dots; g-C(3)N(4)sheets; Fluorescence; Label-free sensor
资金
- SRM Institute of science and technology, Department of Chemistry, Tamilnadu, India
We report a simple new approach on green synthesized carbon dots@graphitic-carbon nitride (CDs@g-C3N4) nanocomposite to explore the potential application of Turn-On fluorescent sensor for signaling the detection of multiple heavy metal ions. As prepared fluorescent CDs exhibits a high dispersibility and g-C3N4 nanosheets show a good exfoliation to strongly hold the CDs over its surface to constitute a label-free sensor. Initially, the fluorescence intensity of CDs was quenched via excited state non-radiative energy transfer process from CDs to gC(3)N(4) sheets. However, on hosting of metal ions into CDs@g-C3N4 nanocomposite it forms a strong surface complex with g-C3N4 nanosheets, which may encourage the recovery of CDs. More interestingly, the sensing performance was investigated at different pH to understand the switching in surface charge of g-C3N4 nanosheets, which has significantly improved the sensitivity for detection of Cr (VI), Cu (II) and Pb (II) ions with a LOD of 0.54 nM, 0.18 nM and 0.2 nM respectively. Moreover, this proposed sensor was expected to be prompt, convenient, low cost, an eco-friendly and sensitive platform for the detecting of heavy metal ions in practical samples with satisfying results.
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