One-step green synthesized fluorescent carbon nanodots from bamboo leaves for copper(II) ion detection

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• 作者：Yingshuai Liu^a ; ^b ; ^{ysliu@swu.edu.cn" class="auth_mail}Author Vitae ; Yanan Zhao^a ; ^bAuthor Vitae ; Yuanyuan Zhang^a ; ^bAuthor Vitae
• 关键词：Carbon quantum dots ; Biomass ; Cu2+ detection ; Photoluminescence
• 刊名：Sensors and Actuators B: Chemical
• 出版年：June, 2014
• 年：2014
• 卷：196
• 期：Complete
• 页码：647-652
• 全文大小：1739 K

文摘

High quantum yield carbon quantum dots (CQDs) are successfully synthesized via a simple, low cost, and green hydrothermal method using bamboo leaves as carbon source for the first time. Branched polyethylenimine (BPEI)-capped CQDs (BPEI-CQDs) are prepared by coating the CQDs with BPEI via electrostatic adsorption. The BPEI-CQDs are then employed as fluorescent probes for sensitive and selective Cu²⁺ detection. Experimental results show that the synthesized CQDs have average size of 3.6 nm in diameter with narrow size distribution. The biomass-based CQDs offer high quantum yield of 7.1%. The BPEI-CQDs-based sensing system renders a simple, reliable and sensitive Cu²⁺detection with limit of detection (LOD) as low as 115 nM and a dynamic range from 0.333 to 66.6 渭M. In addition, the BPEI-CQDs are successfully used to detect Cu²⁺ in river water, demonstrating its good selectivity and great potential for analysis of environmental water samples.