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Study Findings on Fullerenes Are Outlined in Reports from University of Bayreuth (Fullerene-Grafted Copolymers Exhibiting High Electron Mobility...

August 15, 2014

Study Findings on Fullerenes Are Outlined in Reports from University of Bayreuth (Fullerene-Grafted Copolymers Exhibiting High Electron Mobility without Nanocrystal Formation)

By a News Reporter-Staff News Editor at Science Letter -- New research on Fullerenes is the subject of a report. According to news reporting originating in Bayreuth, Germany, by NewsRx journalists, research stated, "Well-soluble fullerene-grafted copolymers PPCBMs with high contents of pendant phenyl-C-61-butyric acid methyl ester (PCBM) between 30 and 64 wt % are reported. Herein, the tailor-made precursor copolymers poly(4-methoxystyrene-stat-4-tert-butoxystyrene) obtained by reversible addition-fragmentation chain transfer (RAFT) polymerization are functionalized via an efficient polymer-analogous esterification."

The news reporters obtained a quote from the research from the University of Bayreuth, "The synthesized acceptor copolymers retain the optical and electrochemical properties of the incorporated PCBM independent of their fullerene weight fraction. Their electron transport properties are studied by the space-charge limited current (SCLC) method. The maximum electron mobility mu(e) of 1 X 10(-4) cm(2) V-1 s(-1) is achieved for 37 wt % of incorporated PCBM. Below 50 wt % of PCBM, the acceptor polymers exhibit exceptional high charge carrier mobility compared to the corresponding blends of molecular PCBM and precursor copolymer. Detailed structural studies using AFM, TEM, and XRD are performed. We confirm amorphous morphology both in thin films and in bulk for the PPCBMs, which clearly indicates the absence of PCBM nanocrystals. Thus, an efficient charge carrier percolation is facilitated by the homogeneous distribution of PCBM in the copolymer."

According to the news reporters, the research concluded: "Additionally, the absence of nanocrystal formation was demonstrated during thermal annealing."

For more information on this research see: Fullerene-Grafted Copolymers Exhibiting High Electron Mobility without Nanocrystal Formation. Macromolecules, 2014;47(7):2324-2332. Macromolecules can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society -; Macromolecules -

Our news correspondents report that additional information may be obtained by contacting M. Hufnagel, University of Bayreuth, Dept. of Macromol Chem 1, D-95440 Bayreuth, Germany. Additional authors for this research include M.A. Muth, J.C. Brendel and M. Thelakkat (see also Fullerenes).

Keywords for this news article include: Europe, Carbon, Germany, Bayreuth, Fullerenes, Nanotechnology, Emerging Technologies

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Source: Science Letter

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