Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 19, Issue 30, Pages 20101-20109Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cp02875j
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Funding
- National Heart, Lung, and Blood Institute of the National Institutes of Health [R15HL129212]
- National Science Foundation [ECCS-1542174]
- US Department of Energy [ER46430]
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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 shows selective quenching upon a reversible redox couple, ferricyanide/ferrocyanide, reaction during cyclic voltammetry. The CND modified gold slide electrode demonstrates wavelength dependent photocurrent generation during the fluorescence-electrochemical study, suggesting the potential application of CNDs in photoelectronics. UV-Vis absorption and electrochemistry are used to quantify the energy gap of the CNDs, and then to calibrate a Huckel model for CNDs' electronic energy levels. The Huckel (or tight binding) model treatment of an individual CND as a molecule combines the conjugated pi 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 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.
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