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Intracrystalline diffusivities for aromatic carbons in ZSM-5 were measured by the zero length column (ZLC) method. Experiments were analyzed by two traditional methods [long time (LT) and short time (ST)] and a new fuller range method which avoids the problems caused by the LT or ST method and is more suitable to analyze ZLC experiments.

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Detection of static and dynamic molecular charge state using a GaAs-based nanowire field-effect transistor (FET) was investigated. Tetraphenylporphyrin (TPP) was put on the device as target molecules. After coating TPP on the FET, the drain current obviously decreased. On the other hand, the current largely increased by 405-nm light irradiation, indicating that TPP worked as photo-excited donor. The light irradiation on the FET also induced Lorentzian noise component, which was superimposed onto conventional 1/f noise.These behaviors were not seen in the gateless nanowire even with TPP. Obtained results indicated that electrical interaction between TPP and the nanowire was enhanced when a metal gate existed, although the channel was protected from TPP by the gate metal. We discuss the observed behaviors on the basis of a model where only TPP in the gate periphery modulated the channel potential and the drain current.2

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