Functional Carbon Quantum Dots for Highly Sensitive Graphene Transistors for Cu2+ Ion Detection
Functional Carbon Quantum Dots for Highly Sensitive Graphene Transistors for Cu2+ Ion Detection
复制标题
用于 Cu2 离子检测的高灵敏度石墨烯晶体管的功能性碳量子点
DOI：
10.1021/acsami.9b20785
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发表时间：
2020-01-29
影响因子：
9.5
通讯作者：
Wang, Xianbao
中科院分区：
文献类型：
--
作者：
Fan, Qin;Li, Jinhua;Wang, Xianbao
Cu 2+离子在人体内发生的各种生物事件中起着重要作用。建立一种高效、可靠的铜离子检测方法对人体健康具有重要意义。溶液门控石墨烯晶体管（SGGT）作为一种有前途的化学和生物传感应用平台已被广泛研究。在此，高灵敏度和高选择性的Cu 2+离子检测传感器的成功构建基于SGGT与功能性碳量子点（CQD）修饰的栅电极。该传感器的传感机理是CQDs与Cu ~（2+）离子的配位作用引起栅电极附近双电层电容的变化，进而引起沟道电流的变化。与其他金属离子相比，Cu 2+离子与CQD具有优异的结合性质，使其成为一种选择性的传感器。CQD修饰的传感器实现了优异的Cu（2+）离子检测，具有最低浓度水平（1 x 10（-14）M），这比从其他常规检测方法获得的值低几个数量级。有趣的是，该设备还显示了秒级的快速响应时间。由于CQDs的功能化特性，具有CQDs修饰的门的SGGT显示出良好的前景，以实现多功能的传感平台，在生化检测。
Cu2+ ions play essential roles in various biological events that occur in the human body. It is important to establish an efficient and reliable detection of Cu2+ ions for people's health. The solution-gated graphene transistors (SGGTs) have been extensively investigated as a promising platform for chemical and biological sensing applications. Herein, highly sensitive and highly selective sensor for Cu2+ ion detection is successfully constructed based on SGGTs with gate electrodes modified by functional carbon quantum dots (CQDs). The sensing mechanism of the sensor is that the coordination of CQDs and Cu2+ ions induces the capacitance change of the electrical double layer (EDL) near the gate electrode and then results in the change of channel current. Compared to other metal ions, Cu2+ ions have an excellent binding nature with CQDs that make it an ultrahigh selective sensor. The CQD-modified sensor achieves excellent Cu(2+ )ion detection with a minimal level of concentration (1 x 10(-14) M), which is several orders of magnitude lower than the values obtained from other conventional detection methods. Interestingly, the device also displays a quick response time on the order of seconds. Due to the functionalized nature of CQDs, SGGTs with CQD-modified gate show good prospects to achieve multifunctional sensing platform in biochemical detections.