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A bis(2-oxoindolin-3-ylidene)-benzodifuran-dione (BIBDF)-based low band gap polymer (PBIBDF-BT), containing a solubilizing alkyl chain bithiophene unit as a donor, has been synthesized. The polymer with a low-lying LUMO/HOMO energy level (--4.03/--5.55 eV) exhibits efficient ambipolar charge transport. The electron and hole mobilities are as high as 1.08 and 0.30 cm² V-1 s-1 respectively. [ABSTRACT FROM AUTHOR]

(001) Oriented calcite crystals were synthesized on mica due to the crystal lattice match between the (001) calcite face and (001) plane of mica. Poly(vinyl sulfonate) and poly(acrylic acid) were used to study their effects on the crystal habit of calcite. Two different kinds of morphogenesis of (001) oriented calcite on mica occurred with the increase of additive concentrations. The present study is useful to understand the roles of additives in the crystallization of CaCO3and provides an appropriate model system for biomineralization. [ABSTRACT FROM AUTHOR]

A blend of organic semiconductors and photocrosslinkable insulating polymers was photolithographically patterned to yield organic thin-film transistors (OTFTs). The semiconducting polymer of the blend, poly(3-hexylthiophene), was present as a nanofibrillar network and yielded excellent electronic properties. The insulating polymer matrix, poly(vinyl cinnamate), provided the photosensitivity required for photopatterning. The photopatterned TFT devices showed large on/off ratios (>105) and high mobilities (0.015 cm2V−1s−1) comparable to those of devices patterned by conventional means using the same semiconducting materials. This simple method permitted the high-resolution cost-effective patterning of organic semiconductors and may play an important role in the mass-production of organic electronic devices. [ABSTRACT FROM AUTHOR]

Fluorinated azobenzene-modified nanoporous substrates were fabricated such that the surface properties were photoreversibly converted between superhydrophobicity and superhydrophilicity as a result of UV irradiation. This result was attributed to the enhanced surface roughness of the nanostructured surface, which supplied sufficient free space within the monolayer for the tethered azobenzenes to facilely isomerize. [ABSTRACT FROM AUTHOR]