Photoinduced Electron Transfer in a MoS<sub>2</sub>/Anthracene Mixed-Dimensional Heterojunction in Aqueous Media

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Abstract

<p>Mixed-dimensional (0D/2D) van der Waals heterojunctions were constructed by physical adsorption of anthracene (Anth) onto few-layer MoS<sub>2</sub> nanosheets. The physical modification of few-layer MoS<sub>2</sub> nanosheets using anthryl dendron <b>1</b>, <i>i.e.</i>, a poly(amidoamine) dendrimer having an anthracene core, via a simple yet efficient exfoliation approach afforded MoS<sub>2</sub>/<b>1</b> hybrids, which are stable for at least one month. The emission quenching typical for anthracene is also observed in the MoS<sub>2</sub>/anthracene mixed-dimensional heterojunctions. Transient absorption measurements on MoS<sub>2</sub>/<b>1</b> hybrids proved that photoinduced electron transfer occurs at the MoS<sub>2</sub>/anthracene interface. The lifetime of the singlet excited state (τ<sub>S1</sub>(<sup>1</sup>Anth*)) for MoS<sub>2</sub>/<b>1</b> was evaluated to be 4.1 ns, which is shorter than that of anthryl dendron <b>1</b> (13 ns). Interestingly, a remarkably long lifetime was observed for the anthracene cation radical (6.1 µs). Relatively long lifetimes of charge-separate states of MoS<sub>2</sub>/<b>1</b> hybrids would be beneficial design features for efficient photovoltaics, photocatalysts, and related optoelectronic applications.</p>
Original languageEnglish
Pages (from-to)745-750
Number of pages6
JournalBulletin of the Chemical Society of Japan
Volume93
Issue number6
DOIs
Publication statusPublished - 2020
Externally publishedYes

Keywords

  • Molybdenum(IV) sulfide
  • Heterojunction
  • Charge transfer

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