By a News Reporter-Staff News Editor at Physics Week -- Research findings on Nanotubes are discussed in a new report. According to news reporting out of New Haven, Connecticut, by VerticalNews editors, research stated, "As hybrid nanomaterials have myriad of applications in modern technology, different functionalization strategies are being intensely sought for preparing nanocomposites with tunable properties and structures. Multi-Walled Carbon Nanotube (MWNT)/CdSe Quantum Dot (QD) heterostructures serve as an important example for an active component of solar cells."
Our news journalists obtained a quote from the research from Yale University, "The attachment mechanism of CdSe QDs and MWNTs is known to affect the charge transfer between them and consequently to alter the efficiency of solar cell devices. In this study, we present a novel method that enables the exchange of some of the organic capping agents on the QDs with carboxyl functionalized MWNTs upon ultrasonication. This produces a ligand-free covalent attachment of the QDs to the MWNTs. EXAFS characterization reveals direct bond formation between the CdSe QDs and the MWNTs. The amount of oleic acid exchanged is quantified by temperature-programmed decomposition; the results indicate that roughly half of the oleic acid is removed from the QDs upon functionalized MWNT addition. Additionally, we characterize the optical and structural properties of the QD-MWNT heterostructures and investigate how these properties are affected by the attachment. The steady state photoluminescence response of QDs is completely quenched. The lifetime of the PL of the QDs measured with time resolved photoluminescence shows a significant decrease after they are covalently bonded to functionalized MWNTs, suggesting a fast charge transfer between QDs and MWNTs."
According to the news editors, the research concluded: "Our theoretical calculations are consistent with and support these experimental findings and provide microscopic models for the QD binding mechanisms."
For more information on this research see: Mechanism for strong binding of CdSe quantum dots to multiwall carbon nanotubes for solar energy harvesting. Nanoscale, 2013;5(15):6893-900. (Royal Society of Chemistry - www.rsc.org/; Nanoscale - pubs.rsc.org/en/journals/journalissues/nr)
Our news journalists report that additional information may be obtained by contacting S. Azoz, Mason Laboratory, Yale University, 9 Hillhouse Avenue, New Haven, Connecticut 06520-8286, United States. Additional authors for this research include J. Jiang, G. Keskar, C. McEnally, A. Alkas, F. Ren, N. Marinkovic, G.L. Haller, S. Ismail-Beigi and L.D Pfefferle.
Keywords for this news article include: New Haven, Fullerenes, Connecticut, Quantum Dots, United States, Nanotechnology, Quantum Physics, Emerging Technologies, North and Central America, Multiwalled Carbon Nanotube.
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