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A nanocomposite of N-doped carbon dots with gold nanoparticles for visible light active photosensitisers

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Abstract

This study aims to report the synthesis of nitrogen-doped carbon dots (N-CDs) derived from biomass, tannic acid and polyethyleneimine, which is a N-doping agent. The N-doping of CDs is found to enhance singlet oxygen (1O2) generation under visible light irradiation. Additionally, the N-CDs work as both a reducing agent and stabiliser, and hence the N-CDs can directly reduce chloroauric acid to form gold nanoparticles (Au NPs) without adding other reducers and stabilisers. The as-prepared N-CD–Au NP nanocomposite possesses 2.3 times higher photosensitising ability for producing 1O2 than N-CDs. To the best of our knowledge, this is the first report on the enhancement of the photosensitising ability of N-CDs by Au NPs. We suggest that the plasmon coupling of Au NPs with the N-CDs causes the energy transfer from the N-CDs to the ground state oxygen (3O2), thus resulting in an increased 1O2 generation.

Graphical abstract: A nanocomposite of N-doped carbon dots with gold nanoparticles for visible light active photosensitisers

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Publication details

The article was received on 18 Jan 2019, accepted on 27 Feb 2019 and first published on 27 Feb 2019


Article type: Paper
DOI: 10.1039/C9PP00035F
Citation: Photochem. Photobiol. Sci., 2019, Advance Article

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    A nanocomposite of N-doped carbon dots with gold nanoparticles for visible light active photosensitisers

    T. Nozaki, T. Kakuda, Y. B. Pottathara and H. Kawasaki, Photochem. Photobiol. Sci., 2019, Advance Article , DOI: 10.1039/C9PP00035F

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