Journal
CARBON
Volume 96, Issue -, Pages 145-152Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2015.09.051
Keywords
Quantum dots; Carbon nanotubes; Interface; Nanohybrids; Photocurrent
Funding
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- FRQNT (Le Fonds de Recherche du Quebec-Nature et Technologies)
- Nano-Quebec (the Quebec Organization for the promotion of nanoscience and nanotechnologies)
- JSPS (Japan Society for the Promotion of Science)
- JSPS [26-360]
- JSPS KAKENHI [24710115]
- National Research Foundation of Korea (NRF) grant - Korea government (MSIP) [NRF-2014R1A2A1A10050585]
Ask authors/readers for more resources
Carbon nanotubes (CNTs)/lead sulfide (PbS) quantum dots (QDs) nanohybrids have been synthesized through the controlled decoration of CNTs by PbS-QDs by means of the pulsed laser deposition technique. The size of the PbS-QDs and their surface coverage of the CNTs' surface are monitored through the number of laser ablation pulses. Here, while comparing both single-walled (SW) and double-walled (DW) CNTs based nanohybrids, focus is put on the investigation of their interfacial structure and the effect of inner tube. Anchoring PbS through direct sulfur-carbon chemical bonding between CNTs' outer wall and PbS-QDs, which are thought to be profitable for efficient charge transfer but not for charge transport along CNT's tube axis, are confirmed by Raman spectroscopy and X-ray photoelectron spectroscopy. In the case of double-walled CNTs (DWCNTs), inner tube remains unaffected by ablated PbS species, then it serves efficient conduction way for transferred photo-generated charges. This unique feature of the DWCNTs based nanohybrid, where the photocharges are generated by the chemically bonded PbS-QDs to the outer tube and then efficiently conveyed by the inner tube of the nanotubes, is highly likely at the origin of their significantly higher photo-activity (several hundred times than in SWCNTs-based nanohybrids). (C) 2015 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available