Electrically controllable metal-insulator-like transition in nanoparticle compacts

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题名:	Electrically controllable metal-insulator-like transition in nanoparticle compacts
作者:	Wang,CW;Wu,CM;Karna,SK;Li,CY;Hsu,CK;Li,CHC;Li,WH
贡献者:	物理學系
关键词:	POWDER COMPACTS;GOLD ATOMS;MAGNETORESISTANCE;RESISTIVITY;CONDUCTANCE;PARTICLES
日期:	2011
上传时间:	2012-06-11 10:48:43 (UTC+8)
出版者:	國立中央大學
摘要:	We report on the observations of tunneling transport in nanocompacts, where nanoparticles are packed into compact units using selective mass compositions and packing densities. An insulator-like thermal behavior in electron transport is seen in a very loosely packed 6-nm Ag nanocompact, whereas the densely packed 4.5-nm Au nanocompact displays a metal-like thermal behavior. Metal-insulator-like transitions, with the transition temperature can readily be tuned by controlling the bias voltage, are observed in the nanocompact consists of mixtures of 2.4 nm Ag and 4.8 nm core/shell Cu/Cu(2)O nanoparticles. The resistivity across the metal-insulator transition is found to change by more than four orders-of-magnitude. At low bias voltages or small excitation currents, the metal-insulator transition occurs at similar to 190 K. The transition temperature can be tuned to reach the ambient temperature when a higher bias voltage or a larger current is allowed. Possible mechanisms that may produce the observed transport characteristics in the nanocompacts are discussed.
關聯:	JOURNAL OF NANOPARTICLE RESEARCH
显示于类别:	[物理學系] 期刊論文

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