Photoluminescence from Single-Walled MoS2Nanotubes Coaxially Grown on Boron Nitride Nanotubes

Ming Liu, Kaoru Hisama, Yongjia Zheng, Mina Maruyama, Seungju Seo, Anton Anisimov, Taiki Inoue, Esko I. Kauppinen, Susumu Okada, Shohei Chiashi, Rong Xiang, Shigeo Maruyama*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Abstract

Single-walled and multiwalled molybdenum disulfide (MoS2) nanotubes have been coaxially synthesized on small-diameter boron nitride nanotubes (BNNTs) that are obtained from removing single-walled carbon nanotubes (SWCNTs) in heteronanotubes of SWCNTs coated by BNNTs. The photoluminescence (PL) from single-walled MoS2 nanotubes supported by core BNNTs is observed in this work, which evidences the direct bandgap structure of single-walled MoS2 nanotubes with a diameter around 6-7 nm. The observation is consistent with our DFT results that the single-walled MoS2 nanotube changes from an indirect-gap to a direct-gap semiconductor when the diameter of a nanotube is more than around 5.2 nm. On the other hand, when there are SWCNTs inside the heteronanotubes of BNNTs and single-walled MoS2 nanotubes, the PL signal from MoS2 nanotubes is considerably quenched. The charge transfer and energy transfer between SWCNTs and single-walled MoS2 nanotubes were examined through characterizations by PL, X-ray photoelectron spectroscopy, and Raman spectroscopy. Moreover, the PL signal from multiwalled MoS2 nanotubes is significantly quenched. Single-walled and multiwalled MoS2 nanotubes exhibit different Raman features in both resonant and nonresonant Raman spectra.

Original languageEnglish
Pages (from-to)8418-8426
Number of pages9
JournalACS Nano
Volume15
Issue number5
Early online date2021
DOIs
Publication statusPublished - 25 May 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • bandgap
  • molybdenum disulfide nanotubes
  • one-dimensional heterostructure
  • photoluminescence
  • Raman spectroscopy
  • single-walled carbon nanotubes

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