Simple and Sensitive Fluorescent and Electrochemical Trinitrotoluene Sensors Based on Aqueous Carbon Dots

详细信息    查看全文

• 作者：Lingling Zhang ; Yujie Han ; Jinbo Zhu ; Yanling Zhai ; Shaojun Dong
• 刊名：Analytical Chemistry
• 出版年：2015
• 出版时间：February 17, 2015
• 年：2015
• 卷：87
• 期：4
• 页码：2033-2036
• 全文大小：283K
• ISSN：1520-6882

文摘

Aqueous N-rich carbon dots (CDs), prepared by the microwave-assisted pyrolysis method, are applied as a dual sensing platform for both the fluorescent and electrochemical detection of 2,4,6-trinitrotoluene (TNT). The fluorescent sensing platform is established on the strong TNT鈥揳mino interaction which can quench the photoluminescence of amino functionalized CDs through charge transfer. The resultant linear detection ranges from 10 nM to 1.5 渭M with a fast response time of 30 s. Glassy carbon electrode modified with CDs exhibits a fine capability for TNT reduction with the linear range from 5 nM to 30 渭M, better than that obtained by the fluorescent method. Moreover, the minimum distinguishable response concentration with respect to these two methods is down to the nanomolar level with a high specificity and sensitivity.