News Column

Findings from Indiana University Reveals New Findings on Nanocrystals (Effects of Surface-Passivating Ligands and Ultrasmall CdSe Nanocrystal Size on...

August 15, 2014



Findings from Indiana University Reveals New Findings on Nanocrystals (Effects of Surface-Passivating Ligands and Ultrasmall CdSe Nanocrystal Size on the De localization of Exciton Confinement)

By a News Reporter-Staff News Editor at Science Letter -- Researchers detail new data in Nanocrystals. According to news reporting originating from Indianapolis, Indiana, by NewsRx correspondents, research stated, "Here we report an unprecedentedly large and controllable decrease in the optical band gap (up to 107 nm, 610 meV) of molecule-like ultrasmall CdSe nanocrystals (diameters ranging from 1.6 to 2.0 nm) by passivating their surfaces with conjugated ligands (phenyldithiocarbamates, PDTCs) containing a series of electron-donating and withdrawing functional groups through a ligand-exchange reaction on dodecylamine (DDA)-coated nanocrystals. This band-edge absorption shift is due to the delocalization of the strongly confined excitonic hole from nanocrystals to the ligand molecular orbitals and not from nanocrystal growth or dielectric constant effects."

Our news editors obtained a quote from the research from Indiana University, "H-1 NMR analysis confirmed that the nanocrystal surface contained a mixed ligation of DDA and PDTC. The effects of the nanocrystal size on the extent of exciton delocalization were also studied and found to be smaller for larger nanocrystals."

According to the news editors, the research concluded: "Modulating the energy level of ligand-passivated ultrasmall nanocrystals and controlling the electronic interaction at the nanocrystal-passivating ligand interface are very important to the fabrication of solid-state devices."

For more information on this research see: Effects of Surface-Passivating Ligands and Ultrasmall CdSe Nanocrystal Size on the De localization of Exciton Confinement. Langmuir, 2014;30(26):7851-7858. Langmuir can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Langmuir - www.pubs.acs.org/journal/langd5)

The news editors report that additional information may be obtained by contacting M.B. Teunis, Indiana University, Purdue University, Integrated Nanosyst Dev Inst, Indianapolis, IN 46202, United States. Additional authors for this research include S. Dolai and R. Sardar (see also Nanocrystals).

Keywords for this news article include: Indianapolis, United States, Nanotechnology, Emerging Technologies, North and Central America

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


For more stories covering the world of technology, please see HispanicBusiness' Tech Channel



Source: Science Letter


Story Tools






HispanicBusiness.com Facebook Linkedin Twitter RSS Feed Email Alerts & Newsletters