Photoinduced Electron Transfer in a MoS2/Anthracene Mixed-Dimensional Heterojunction in Aqueous Media

Research output: Contribution to journalArticle

Abstract

Mixed-dimensional (0D/2D) van der Waals heterojunctions were constructed by physical adsorption of anthracene (Anth) onto few-layer MoS2 nanosheets. The physical modification of few-layer MoS2 nanosheets using anthryl dendron 1, i.e., a poly(amidoamine) dendrimer having an anthracene core, via a simple yet efficient exfoliation approach afforded MoS2/1 hybrids, which are stable for at least one month. The emission quenching typical for anthracene is also observed in the MoS2/anthracene mixed-dimensional heterojunctions. Transient absorption measurements on MoS2/1 hybrids proved that photoinduced electron transfer occurs at the MoS2/anthracene interface. The lifetime of the singlet excited state (τS1(1Anth*)) for MoS2/1 was evaluated to be 4.1 ns, which is shorter than that of anthryl dendron 1 (13 ns). Interestingly, a remarkably long lifetime was observed for the anthracene cation radical (6.1 ¯s). Relatively long lifetimes of charge-separate states of MoS2/1 hybrids would be beneficial design features for efficient photovoltaics, photocatalysts, and related optoelectronic applications.

Original languageEnglish
Pages (from-to)745-750
Number of pages6
JournalBulletin of the Chemical Society of Japan
Volume93
Issue number6
DOIs
Publication statusPublished - 2020

Keywords

  • Charge transfer
  • Heterojunction
  • Molybdenum(IV) sulfide

ASJC Scopus subject areas

  • Chemistry(all)

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