Journal
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
Volume 18, Issue 5, Pages 1235-1241Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9pp00035f
Keywords
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Funding
- JSPS KAKENHI [15H03520, 15H03526, 26107719]
- Grants-in-Aid for Scientific Research [26107719, 15H03520, 15H03526] Funding Source: KAKEN
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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 (O-1(2)) 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 O-1(2) 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 (O-3(2)), thus resulting in an increased O-1(2) generation.
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