A simple approach of fabricating thermoelectric γ-NaxCoO2 and superconductive Nax(H2O)yCoO2-δ films using the sol-gel spin-coating method

Chia Jyi Liu; Pradipta K. Nayak; Yong Zhi Chen

doi:10.1016/j.tsf.2009.06.038

A simple approach of fabricating thermoelectric γ-Na_xCoO₂ and superconductive Na_x(H₂O)_yCoO_2-δ films using the sol-gel spin-coating method

Chia Jyi Liu, Pradipta K. Nayak, Yong Zhi Chen

Department of Physics

Research output: Contribution to journal › Article

7 Citations (Scopus)

Abstract

We report a simple approach of fabricating thermoelectric γ-Na_xCoO₂ 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-Na_0.68CoO₂ film grown by the reactive solid-phase epitaxy. The fitted thermopower data show that the bandwidth of γ-Na_xCoO₂ 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-Na_0.7CoO₂. These results enable the possibility of low-cost fabrication of γ-Na_xCoO₂-based thermoelectric film devices. Furthermore, we have also topotactically transformed the of γ-Na_xCoO₂ film to a superconducting Na_x(H₂O)_yCoO_2-δ film with T_{c, onset} = 4.12 K.

Original language	English
Pages (from-to)	91-93
Number of pages	3
Journal	Thin Solid Films
Volume	518
Issue number	1
DOIs	https://doi.org/10.1016/j.tsf.2009.06.038
Publication status	Published - 2009 Nov 2

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Surfaces and Interfaces
Surfaces, Coatings and Films
Metals and Alloys
Materials Chemistry

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Liu, C. J., Nayak, P. K., & Chen, Y. Z. (2009). A simple approach of fabricating thermoelectric γ-Na_xCoO₂ and superconductive Na_x(H₂O)_yCoO_2-δ films using the sol-gel spin-coating method. Thin Solid Films, 518(1), 91-93. https://doi.org/10.1016/j.tsf.2009.06.038

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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.",

author = "Liu, {Chia Jyi} and Nayak, {Pradipta K.} and Chen, {Yong Zhi}",

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AU - Chen, Yong Zhi

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N2 - 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.

AB - 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.

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