A novel “double cable” material for photodiodes, containing both electron‐ and hole‐transporting functional groups, is obtained by co‐polymerization of thiophenes that bear a covalently linker‐bound fullerene (see Figure). Even at 14 % of fullerene substitution, the order of the main polythiophene chain is not seriously disturbed.
The synthesis of a novel bithiophene with a pendant fullerene substituent and its electrochemical polymerisation are reported; light induced ESR measurements on the electrodeposited films reveal a photoinduced electron transfer from the donor cable (polythiophene) to the pendant acceptor cable (fullerene moieties).
We have prepared a novel bithiophene carrying a fulleropyrrolidine substituent. Its electrochemical polymerization affords an electron donor-acceptor material that has been studied by means of electrochemical and spectroscopic techniques. The results from photoinduced absorption (PIA) and light-induced electron spin resonance (LESR) experiments demonstrate a photoinduced electron transfer from the polythiophene backbone to the tethered acceptor moieties.
Nanometric ceria powders doped with 30 mol % samaria are consolidated by a high‐pressure spark plasma sintering (HP‐SPS) method to form > 99 % dense samples with a crystallite size as small as 16.5 nm. A conductivity dependence on grain size was noted: when the grain size was less than 20 nm, only one semicircle in the AC impedance spectra was observed and was attributed to bulk conductivity. In contrast to previous observations on pure ceria, the disappearance of the grain‐boundary blocking effect is not associated with mixed conductivity. With annealing and concomitant grain growth, the samples show the presence of a grain‐boundary effect.
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