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NCUEIR > College of Science > Department of Physics > Periodical Articles > Item 987654321/14254

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/14254

Title:	A Simple Approach of Fabricating Thermoelectric γ-NaxCoO2 and Superconductive Nax(H2O)yCoO2-δFilms Using the Sol-gel Spin-coating Method
Authors:	Liu, Chia-Jyi;Nayak, Pradipta K.;Chen, Yong-Zhi
Contributors:	物理學系
Keywords:	Thermoelectric oxides;sol-gel spin coating;Superconductivity;Electrical resistivity;Thermoelectric power
Date:	2009-11
Issue Date:	2012-09-10T06:16:04Z
Publisher:	Elsevier
Abstract:	We report a simple approach of fabricating thermoelectric γ-NaxCoO2 film with the c-axis orientation using the sol–gel spin-coating method. The inferred sodium content is x = 0.65 according to the correlation between the c-axis lattice constant and x. Temperature dependence of both the resistivity and thermopower resembles that of the γ-Na0.68CoO2 film grown by the reactive solid-phase epitaxy. The fitted thermopower data show that the bandwidth of γ-NaxCoO2 is found to be ~ 101 meV, being close to the quasi-particle band (70–100 meV) derived from an angle-resolved photoemission study of γ-Na0.7CoO2. These results enable the possibility of low-cost fabrication of γ-NaxCoO2-based thermoelectric film devices. Furthermore, we have also topotactically transformed the of γ-NaxCoO2 film to a superconducting Nax(H2O)yCoO2-δ film with Tc, onset = 4.12 K.
Relation:	Thin Solid Films, 518(1): 91-93
Appears in Collections:	[Department of Physics] Periodical Articles

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