Emergence of new red-shifted carbon nanotube photoluminescence based on proximal doped-site design

Tomohiro Shiraki, Tomonari Shiraishi, Gergely Juhász, Naotoshi Nakashima

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

Abstract

Single-walled carbon nanotubes (SWNTs) show unique photoluminescence (PL) in the near-infrared (NIR) region. Here we propose a concept based on the proximal modification in local covalent functionalization of SWNTs. Quantum mechanical simulations reveal that the SWNT band gap changes specifically based on the proximal doped-site design. Thus, we synthesize newly-designed bisdiazonium molecules and conduct local fucntionalisation of SWNTs. Consequently, new red-shifted PL (E 11 2∗) from the bisdiazonium-modified SWNTs with (6, 5) chirality is recognized around 1250 nm with over ∼270 nm Stokes shift from the PL of the pristine SWNTs and the PL wavelengths are shifted depending on the methylene spacer lengths of the modifiers. The present study revealed that SWNT PL modulation is enable by close-proximity-local covalent modification, which is highly important for fundamental understanding of intrinsic SWNT PL properties as well as exciton engineering-based applications including photonic devices and (bio)imaging/sensing.

Original languageEnglish
Article number28393
JournalScientific reports
Volume6
DOIs
Publication statusPublished - Jun 27 2016

All Science Journal Classification (ASJC) codes

  • General

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