Photoelectrochemical response of carbon dots (CDs) derived from chitosan and their use in electrochemical imaging
Photoelectrochemical response of carbon dots (CDs) derived from chitosan and their use in electrochemical imaging
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DOI：
10.1039/c7mh00784a
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发表时间：
2018-05
影响因子：
13.3
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中科院分区：
文献类型：
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我们报道了由壳聚糖通过溶剂热方法制备的低成本碳点(CDs)的直接光电化学响应。碳点通过自组装的硅烷单分子膜共价连接到氧化铟锡(ITO)表面。我们将ITO-硅烷-Cd表面的光电流归因于在420 nm到450 nm的光照下，硫化镉发生的光生电子转移过程。利用自组装单分子膜对表面进行微米级横向分辨率的交流光电流成像。这一发现为镉在生物分析和生物成像应用中作为生物相容的、光可寻址的电化学传感器开辟了新的应用。
We report a direct photoelectrochemical response from low cost carbon dots (CDs) prepared from chitosan via a solvothermal method. The carbon dots were covalently linked to an indium tin oxide (ITO) surface through a self-assembled silane monolayer. We attribute the photocurrent of the ITO–silane–CD surface to a photogenerated electron-transfer process by CDs under illumination with a wavelength of 420 nm to 450 nm. The self-assembled monolayer of CDs was used for ac-photocurrent imaging of the surface with micron scale lateral resolution. This discovery opens up new applications for CDs as biocompatible, light-addressable electrochemical sensors in bioanalytical and bioimaging applications.