Covalent Synthesis and Optical Characterization of Double-Walled Carbon Nanotube-Nanocrystal Heterostructures

Journal Article · Thu May 20 04:00:00 EDT 2010 · Journal of Physical Chemistry C

DOI:https://doi.org/10.1021/jp100580h· OSTI ID:984814

Peng, X; Sfeir, M; Zhang, F; Misewich, J A; Wong, S S

The unique electronic structure and optical properties of double-walled carbon nanotubes (DWNTs) have made them a key focus material of research in recent years. However, the incorporation of DWNTs with quantum dots (QDs) into nanocomposites via a covalent chemical approach as well as the optical properties of the composites have rarely been explored. In particular, we have been interested in this model system to investigate whether nanomaterial heterostructures can provide efficient pathways for charge separation relative to loss mechanisms such as recombination. In this specific work, the synthesis of DWNT-CdSe QD heterostructures obtained by using a conventional covalent protocol has been demonstrated. CdSe QDs with terminal amino groups have been conjugated onto the surfaces of oxidized DWNTs by the formation of amide bonds. The observed trap emission of CdSe is thought to arise from the presence of 2-aminoethanethiol capping ligands and is effectively quenched upon conjugation with the DWNT surface because of the charge transfer from CdSe to DWNTs.

• Research Organization: BROOKHAVEN NATIONAL LABORATORY (BNL)
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 984814
• Report Number(s): BNL--91357-2010-JA; KC0202020
• Journal Information: Journal of Physical Chemistry C, Journal Name: Journal of Physical Chemistry C Journal Issue: 19 Vol. 114; ISSN 1932-7447
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMIDES
CARBON
ELECTRONIC STRUCTURE
NANOTUBES
OPTICAL PROPERTIES
QUANTUM DOTS
RECOMBINATION
SYNTHESIS