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Enhancing light absorption and charge transfer efficiency in carbon dots through graphitization and core nitrogen doping

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Title: Enhancing light absorption and charge transfer efficiency in carbon dots through graphitization and core nitrogen doping
Authors: Martindale, BCM
Hutton, GAM
Caputo, CA
Prantl, S
Godin, RP
Durrant, JR
Reisner, E
Item Type: Journal Article
Abstract: Single-source precursor syntheses have been devised for the preparation of structurally similar graphitic carbon dots (CDs), with (g-N-CD) and without (g-CD) core nitrogen doping for artificial photosynthesis. An order of magnitude improvement has been realized in the rate of solar (AM1.5G) H2 evolution using g-N-CD (7950 μmolH2 (gCD)−1 h−1) compared to undoped CDs. All graphitized CDs show significantly enhanced light absorption compared to amorphous CDs (a-CD) yet undoped g-CD display limited photosensitizer ability due to low extraction of photogenerated charges. Transient absorption spectroscopy showed that nitrogen doping in g-N-CD increases the efficiency of hole scavenging by the electron donor and thereby significantly extends the lifetime of the photogenerated electrons. Thus, nitrogen doping allows the high absorption coefficient of graphitic CDs to be translated into high charge extraction for efficient photocatalysis.
Issue Date: 2-May-2017
Date of Acceptance: 3-Apr-2017
URI: http://hdl.handle.net/10044/1/46246
DOI: https://dx.doi.org/10.1002/anie.201700949
ISSN: 1433-7851
Publisher: Wiley
Start Page: 6459
End Page: 6463
Journal / Book Title: Angewandte Chemie - International Edition
Volume: 56
Issue: 23
Copyright Statement: © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
Sponsor/Funder: Commission of the European Communities
Funder's Grant Number: 291482
Keywords: Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Chemistry
carbon dots
doping
excited state dynamics
light harvesting
photocatalysis
PHOTOCATALYTIC HYDROGEN GENERATION
GRAPHENE QUANTUM DOTS
NICKEL-CATALYST
CITRIC-ACID
NANODOTS
STATES
SEMICONDUCTOR
LUMINESCENCE
TEMPERATURE
REDUCTION
Organic Chemistry
03 Chemical Sciences
Publication Status: Published
Appears in Collections:Chemistry
Faculty of Natural Sciences



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