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.

中文翻译：

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壳聚糖衍生的碳点（CD）的光电化学反应及其在电化学成像中的用途†

我们报告了通过溶剂热法从壳聚糖制备的低成本碳点（CD）的直接光电化学反应。碳点通过自组装的硅烷单层共价连接到铟锡氧化物（ITO）表面。我们将ITO-硅烷-CD表面的光电流归因于CD在波长为420 nm至450 nm的光照下的光生电子转移过程。CD的自组装单层用于微米级横向分辨率的表面的交流光电流成像。这一发现为生物分析和生物成像应用中的生物相容性，光寻址电化学传感器打开了CD的新应用。