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Electronic transmission of three-terminal pyrene molecular bridge

Chinese Physics B 2009年第2期18卷 501-505页

作者：王利光张秀梅 Terence Kin Shun Wong Katsunori Tagami Masaru Tsukada School of Science Jiangnan University School of Electrical and Electronic Engineering Nanyang Technological University Nano Technology Research Centre Waseda University

This paper investigates theoretically the electronic transmission spectra of the three terminal pyrene molecular bridge and the quantum current distribution on each bond by the tight-binding model based on nonequilibrium Green＇s function and the quantum current density approach, in which one π molecular orbital is taken into account per carbon atom when the energy levels and HOMO-LUMO gap are obtained. The transmission spectra show that the electronic transmission of the three terminal pyrene molecular bridge depends obviously on the incident electronic energy and the pyrene eigenenergy. The symmetrical and oscillation properties of the transmission spectra are illustrated. A novel plus-minus energy switching function is found. The quantum current distribution shows that the loop currents inside the pyrene are induced, and some bond currents are much larger than the input and the output currents. The reasons why the loop currents and the larger bond currents are induced are the phase difference of the atomic orbits and the degeneracy of the molecular orbits. The calculations illustrate that the quantum current distributions are in good agreement with Kirchhoff quantum current conservation law.

关键词： pyrene three terminals electronic transmission current distribution

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Simple Planar Structure Hydrogen Gas Sensor Device with Large Response

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稀有金属材料与工程 2006年第A3期35卷 120-123页

作者： Shinji Nakagomi Takashi Shida Yu Itsukaichi Yoshihiro Kokubun Faculty of Science and Engineering Ishinomaki Senshu UniversityIshinomak 986-8580Japan

Hydrogen gas sensor device with simple planar structure based on p^+ silicon substrate with n-type epi-layer was fabricated only by using a lift-off technique of an evaporated metal *** device consists of Ohmic source and drain electrodes and platinum Schottky gate *** sensor device has a little similar property as ***-voltage characteristics between the source and drain of the device are sensitive to hydrogen *** voltage difference between in hydrogen ambient and oxygen ambient is about 2.3 volts for a constant current of 0.9 *** device can detect 0.4% hydrogen gas in *** on oxidation reaction of hydrogen on the surface of the platinum gate,hydrogen sensitivity of the device changes by the coexisting oxygen *** flow in the buried channel formed between the gate electrode and the p^+n *** was confirmed that the gate bias influences the *** current-voltage property changes also depending on the wiring method.

关键词： planar structure hydrogen sensor three terminals large response

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