Synthesis of N-doped graphene quantum dots by pulsed laser ablation with diethylenetriamine (DETA) and their photoluminescence

S. R. M. Santiago; T. N. Lin; C. H. Chang; Y. A. Wong; C. A. J. Lin; C. T. Yuan; J. L. Shen

doi:10.1039/C7CP03993J

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Synthesis of N-doped graphene quantum dots by pulsed laser ablation with diethylenetriamine (DETA) and their photoluminescence

S. R. M. Santiago,^a T. N. Lin,^a C. H. Chang,^b Y. A. Wong,^c C. A. J. Lin,^d C. T. Yuan^a and J. L. Shen

*^a

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* Corresponding authors

^a Department of Physics and Center for Nanotechnology, Chung Yuan Christian University, Chung-Li 32023, Taiwan
E-mail: jlshen@cycu.edu.tw

^b Master Program in Nanotechnology at CYCU, Chung Yuan Christian University, Chung-Li 32023, Taiwan

^c Department of Ecology, Evolution and Marine Biology, University of California at Santa Barbara, CA 93106-5055, USA

^d Department of Biomedical Engineering, Chung Yuan Christian University, Chung-Li, Taiwan

Abstract

We report a facile, fast, and one-step approach to prepare N-doped graphene quantum dots (GQDs) using pulsed laser ablation with diethylenetriamine (DETA). The synthesized N-doped GQDs with an average size of about 3.4 nm and an N/C atomic ratio of 26% have been demonstrated. Compared to pristine GQDs, the N-doped GQDs emit enhanced photoluminescence (PL) with a factor as high as 66, originated from the enhanced densities of pyridinic and graphitic N. The temperature-dependent PL of the N-doped GQDs was studied from cryogenic to room temperature. An anomalous temperature dependence of PL intensity was observed for the N-doped GQDs, which was ascribed to a carrier transfer mechanism from a dopant-induced state to the quantum-dot emitting state.

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DOI: https://doi.org/10.1039/C7CP03993J
Article type: Paper
Submitted: 14 Jun 2017
Accepted: 06 Aug 2017
First published: 07 Aug 2017

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Phys. Chem. Chem. Phys., 2017,19, 22395-22400

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Synthesis of N-doped graphene quantum dots by pulsed laser ablation with diethylenetriamine (DETA) and their photoluminescence

S. R. M. Santiago, T. N. Lin, C. H. Chang, Y. A. Wong, C. A. J. Lin, C. T. Yuan and J. L. Shen, Phys. Chem. Chem. Phys., 2017, 19, 22395 DOI: 10.1039/C7CP03993J

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Physical Chemistry Chemical Physics

Synthesis of N-doped graphene quantum dots by pulsed laser ablation with diethylenetriamine (DETA) and their photoluminescence

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Synthesis of N-doped graphene quantum dots by pulsed laser ablation with diethylenetriamine (DETA) and their photoluminescence

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