The movement of nanosized Au clusters on Si bicrystal was found to be critically influenced by strained fields of the buried twist-dislocation network by in situ ultrahigh vacuum transmission electronic microscopy. Collective movement of Au atoms was observed. Most strikingly, clusters of more than three million atoms move concertedly by one dislocation spacing (7–45 nm) within 1∕30s at a substrate temperature of 250 °C. The “jumping” mechanism is attributed to the viscous flow. The observation shall serve as a good reference to refine the theory to realize the control of self-organized nanoparticles on silicon bicrystals.

A metal-oxide field-effect transistor ͑MOSFET͒ based on an electroluminescent conjugated polymer is fabricated on a glass substrate. It is found that the mobility horizontal to the substrate is two to three orders of magnitude larger than the mobility vertical to the substrate. The high horizontal mobility is attributed to the in-plane chain alignment in amorphous spin-coated films. We demonstrate an active pixel in which the light-emitting diode and the driving MOSFET share the same active polymer.

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SynopsisPlasma activation is a method that takes the advantage of low temperature plasma to immobilize the bioactive materials. An active immobilized glucose oxidase membrane was obtained via plasma-initiated polymerization of acrylic acid. The obtained immobilized enzyme is very active and stable. After 100 tests, the response error of the glucose sensor is less than 5% and its linear detecting range is 0-300 ppm. A hydrophilic PP film treated by Ar or NH, plasma was used for the preparation of the immobilized glucose oxidase membrane. The obtained immobilized enzyme is also very active and stable. After 180 tests, the response error of the glucose sensor is less than 4% and its linear detecting range is 0-300 ppm. Furthermore, SEM w a s used to study the mophology of the glucose oxidase membranes obtained via both methods. And ESCA was used t o analyze the plasm-initiated polymerization products and the plasma-treated PP films so as t o obtain the optimum conditions for the immobilization of bioactive materials.

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