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

Publication Type:

Journal Article

Source:

Materials Horizons, Volume 5, Issue 3, p.423-428 (2018)

ISBN:

2051-6347

Abstract:

<p>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.</p>