Photoluminescence quenching of graphene oxide by metal ions in aqueous media

Di Yan Wang, Duan Wei Wang, Hsin An Chen, Tin Reui Chen, Shao Sian Li, Yun Chieh Yeh, Tsung Rong Kuo, Jiahn Haur Liao, Yu Ching Chang, Wei Ting Chen, Shih Hsiung Wu, Cho Chun Hu, Chun Wei Chen, Chia Chun Chen

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The photoluminescence (PL) quenching of water-soluble graphene oxide (GO) solution was systematically investigated in the presence of transition metal ions. Their PL spectra were analyzed by the Stern-Volmer equation, and the trend of the quenching efficiency was Fe2+ > Co2+ > Ni2+ > Cd2+ > Hg2+. The results of the steady-state and time-resolved PL spectra of the GO solution suggested that the PL quenching was related to the new non-radiative optical transitions from the bridging states due to the hybridization of the sp3 orbitals of GO and the 3d orbitals of metal ions, proven by density functional theory calculations. The overall results indicated that the bridging states from the hybridization of GO sp3 and unfilled 3d orbitals (Fe2+) in comparison with filled 3d orbitals (Hg2+) were highly localized, and their energy levels were more suitable for being non-radiative transition states.

Original languageEnglish
Pages (from-to)24-30
Number of pages7
JournalCarbon
Volume82
Issue numberC
DOIs
Publication statusPublished - 2015
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)

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