Efficient electron transfer in carbon nanodot-graphene oxide nanocomposites

Pyng Yu*, Xiaoming Wen, Yon-Rui Toh, Yu-Chieh Lee, Kuo-Yen Huang, Shujuan Huang, Santosh Shrestha, Gavin Conibeer, Jau Tang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)

Abstract

Carbon nanodots (CNDs) have emerged as fascinating materials with exceptional electronic and optical properties, and thus they offer many promising applications in photovoltaics and photocatalysis. In this paper we investigate electron transfer in nanocomposites of CNDs-graphene oxide (GO), -multi-walled carbon nanotubes (MWNTs) and -TiO2 nanoparticles without linker molecules, using steady state and time-resolved spectroscopy. Significant fluorescence quenching was observed in the CND-GO system, and it is attributed to the ultrafast electron transfer from CNDs to GO with a time constant of 400 fs. In comparison, carbon nanotubes result in static quenching of fluorescence in CNDs. No charge transfer was observed in both CND-MWNT and CND-TiO2 nanocomposites. This finding suggests that the CND-GO nanocomposite can be an excellent candidate for hot carrier solar cells due to the effective carrier extraction, broad spectral absorption, weak electron-phonon scattering, and thus a slow cooling rate for hot carriers.

Original languageEnglish
Pages (from-to)2894-2901
Number of pages8
JournalJournal of Materials Chemistry C
Volume2
Issue number16
DOIs
Publication statusPublished - 28 Apr 2014
Externally publishedYes

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