By a News Reporter-Staff News Editor at Electronics Newsweekly -- Current study results on Nanocrystals have been published. According to news reporting originating from Perugia, Italy, by VerticalNews correspondents, research stated, "The exciton dynamics in semiconductor nanocrystals can be strongly affected by coupling the nanocrystals to organic ligands. A deeper understanding of the interactions in semiconductor-organic hybrid systems is important for the design of functional devices."
Our news editors obtained a quote from the research from the University of Perugia, "In the present work, the interactions between CdS quantum dots and bithiophene molecules have been investigated. In particular, the photophysical behavior of CdS nanocrystals has been investigated in n-heptane in the presence of increasing bithiophene concentration by use of steady-state and time-resolved measurements. Bithiophene is a well-known electron donor (or hole acceptor), and it has a good affinity with CdS surface for the presence of sulfur atoms. The nanocrystal luminescence was efficiently quenched upon addition of increasing concentration of the thiophene derivative, and modifications in the emission decay profiles of CdS were observed; the analysis of luminescence data suggests that quenching is mainly due to static interaction able to modify the dynamics of the exciton states of the hybrid nanomaterials. The transient absorption measurements enable to detect the bithiophene radical cation upon CdS excitation, thus revealing the occurrence of an efficient hole transfer process from the nanocrystals to the organic ligand, for which a quantum efficiency of 36% has been measured. The dependence of transient signal on bithiophene concentration and the formation of tetrathiophene intermediates indicate that CdS exciton states are able to photosensitize the polymerization of bithiophene after the hole transfer processes."
According to the news editors, the research concluded: "The data indicate that in the investigated system the decay of charged species is not determined by back-reactions."
For more information on this research see: Photoinduced Formation of Bithiophene Radical Cation via a Hole-Transfer Process from CdS Nanocrystals. Journal of Physical Chemistry C, 2013;117(45):23996-24002. Journal of Physical Chemistry C can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Journal of Physical Chemistry C - www.pubs.acs.org/journal/jpccck)
The news editors report that additional information may be obtained by contacting A. Iagatti, University of Perugia, CEMIN, I-06123 Perugia, Italy. Additional authors for this research include R. Flamini, M. Nocchetti and L. Latterini.
Keywords for this news article include: Italy, Europe, Perugia, Electronics, Semiconductor, Nanotechnology, Emerging Technologies
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