Boron-Doped Graphene Quantum Dots for Selective Glucose Sensing Based on the 鈥淎bnormal鈥?Aggregation-Induced Photoluminescence Enhancement

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• 作者：Li Zhang ; Zhi-Yi Zhang ; Ru-Ping Liang ; Ya-Hua Li ; Jian-Ding Qiu
• 刊名：Analytical Chemistry
• 出版年：2014
• 出版时间：May 6, 2014
• 年：2014
• 卷：86
• 期：9
• 页码：4423-4430
• 全文大小：579K
• 年卷期：v.86,no.9(May 6, 2014)
• ISSN：1520-6882

文摘

A hydrothermal approach for the cutting of boron-doped graphene (BG) into boron-doped graphene quantum dots (BGQDs) has been proposed. Various characterizations reveal that the boron atoms have been successfully doped into graphene structures with the atomic percentage of 3.45%. The generation of boronic acid groups on the BGQDs surfaces facilitates their application as a new photoluminescence (PL) probe for label free glucose sensing. It is postulated that the reaction of the two cis-diol units in glucose with the two boronic acid groups on the BGQDs surfaces creates structurally rigid BGQDs鈥揼lucose aggregates, restricting the intramolecular rotations and thus resulting in a great boost in the PL intensity. The present unusual 鈥渁ggregation-induced PL increasing鈥?sensing process excludes any saccharide with only one cis-diol unit, as manifested by the high specificity of BGQDs for glucose over its close isomeric cousins fructose, galactose, and mannose. It is believed that the doping of boron can introduce the GQDs to a new kind of surface state and offer great scientific insights to the PL enhancement mechanism with treatment of glucose.