A fluorescence-electrochemical study of carbon nanodots (CNDs) in bio- and photoelectronic applications and energy gap investigation.
A fluorescence-electrochemical study of carbon nanodots (CNDs) in bio- and photoelectronic applications and energy gap investigation.
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DOI：
10.1039/c7cp02875j
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发表时间：
2017-08-02
期刊：
影响因子：
--
通讯作者：
Wei J
中科院分区：
文献类型：
--
作者：
Zeng Z;Zhang W;Arvapalli DM;Bloom B;Sheardy A;Mabe T;Liu Y;Ji Z;Chevva H;Waldeck DH;Wei J
碳纳米点（CND）由于其优异的溶解度、生物相容性、可调谐的光致发光和光电特性而引起了极大的关注。这项工作描述了一种新的基于荧光的光谱电化学方法，用于同时研究微波合成 CND 的光致发光和波长依赖性光电流。 CND 的荧光在循环伏安法期间对可逆氧化还原对、铁氰化物/亚铁氰化物 - 反应具有选择性猝灭。 CND 修饰的金滑动电极在荧光电化学研究中表现出波长依赖性光电流的产生，表明在光电子学中的潜在应用。紫外-可见光吸收和电化学用于量化 CND 的能隙，然后校准 CND 电子能级的 Hückel 模型。 Hückel（或紧密结合）模型将单个 CND 视为分子，将共轭 π 态 (C=C) 与与表面电子态相关的官能团（C=O、C-O 和 COOH）结合起来。 CND 的实验和理论研究为 CND 的光电特性提供了新的视角，并有助于其在生物医学、化学传感和光电设备中的实际应用的开发。通过新颖的荧光光谱电化学和综合能隙研究，获得了对 CND 光电特性的新视角。
Carbon nanodots (CNDs) have attracted great attention due to their superior solubility, biocompatibility, tunable photoluminescence, and opto-electronic properties. This work describes a new fluorescence-based spectroelectrochemistry approach to simultaneously study the photoluminescence and wavelength dependent photocurrent of microwave synthesized CNDs. The fluorescence of CNDs has a selective quench upon a reversible redox couple, ferricyanide/ferrocyanide,− reaction during the cyclic voltammetry. The CNDs modified gold slide electrode demonstrates wavelength dependent photocurrent generation during the fluorescence-electrochemical study, suggesting potential application in photoelectronics. UV-Vis absorption and electrochemistry are used to quantify the energy gap of the CNDs, and then to calibrate a Hückel model for the CNDs electronic energy levels. The Hückel (or tight binding) model treatment of an individual CND as a molecule combines the conjugated π states (C=C) with the functional groups (C=O, C-O, and COOH) associated with the surface electronic states. This experimental and theoretical investigation of the CNDs provides a new perspective on the optoelectronic properties of CNDs and should aid in their development for practical use in biomedicine, chemical sensing, and photoelectric devices. A new perspective on optoelectronic properties of CNDs is obtained from a novel fluorescence spectroelectrochemitry and comprehensive energy gap investigation.
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