Electrically controllable metal-insulator-like transition in nanoparticle compacts

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/52893

Title:	Electrically controllable metal-insulator-like transition in nanoparticle compacts
Authors:	Wang,CW;Wu,CM;Karna,SK;Li,CY;Hsu,CK;Li,CHC;Li,WH
Contributors:	物理學系
Keywords:	POWDER COMPACTS;GOLD ATOMS;MAGNETORESISTANCE;RESISTIVITY;CONDUCTANCE;PARTICLES
Date:	2011
Issue Date:	2012-06-11 10:48:43 (UTC+8)
Publisher:	國立中央大學
Abstract:	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.
Relation:	JOURNAL OF NANOPARTICLE RESEARCH
Appears in Collections:	[Department of Physics] journal & Dissertation

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