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Open AccessArticle

Carbon Quantum Dots Prepared with Chitosan for Synthesis of CQDs/AuNPs for Iodine Ions Detection

by Juanjuan Song 1,†, Li Zhao 1,†, Yesheng Wang 1, Yun Xue 1, Yujia Deng 1, Xihui Zhao 1,2,* and Qun Li 1,2
1
School of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, China
2
State Key Laboratory of Bio-Fibers and Eco-Textiles, Shandong Collaborative Innovation Center of Marine Biobased Fibers and Ecological Textiles, Institute of Marine Biobased Materials, Qingdao University, Qingdao 266071, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Nanomaterials 2018, 8(12), 1043; https://doi.org/10.3390/nano8121043
Received: 23 November 2018 / Revised: 8 December 2018 / Accepted: 11 December 2018 / Published: 13 December 2018
Water-soluble and reductive carbon quantum dots (CQDs) were fabricated by the hydrothermal carbonization of chitosan. Acting as a reducing agent and stabilizer, the as-prepared CQDs were further used to synthesize gold nanoparticles (AuNPs). This synthetic process was carried out in aqueous solution, which was absolutely “green”. Furthermore, the CQDs/AuNPs composite was used to detect iodine ions by the colorimetric method. A color change from pink to colorless was observed with the constant addition of I ions, accompanied by a decrease in the absorbance of the CQDs/AuNPs composite. According to the absorbance change, a favorable linear relationship was obtained between ΔA and I concentration in the range of 20–140 μM and 140–400 μM. The detection limit of iodide ions, depending on the 3δ/slope, was estimated to be 2.3 μM, indicating high sensitivity to the determination of iodide. More importantly, it also showed good selectivity toward I over other anion ions, and was used for the analysis of salt samples. Moreover, TEM results indicated that I ions induced the aggregation of CQDs/AuNPs, resulting in changes in color and absorbance. View Full-Text
Keywords: carbon quantum dots; chitosan; gold nanoparticles; Iodine ions detection carbon quantum dots; chitosan; gold nanoparticles; Iodine ions detection
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MDPI and ACS Style

Song, J.; Zhao, L.; Wang, Y.; Xue, Y.; Deng, Y.; Zhao, X.; Li, Q. Carbon Quantum Dots Prepared with Chitosan for Synthesis of CQDs/AuNPs for Iodine Ions Detection. Nanomaterials 2018, 8, 1043.

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