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Research Papers

Thermal and Electrical Properties of 3.2 nm Thin Gold Films Coated on Alginate Fiber

[+] Author and Article Information
Hua Dong

School of Environmental and
Municipal Engineering,
Qingdao University of Technology,
Qingdao 266033, Shandong, China
e-mail: dhua1959@hotmail.com

Ranran Chen

School of Environmental and
Municipal Engineering,
Qingdao University of Technology,
Qingdao 266033, Shandong, China
e-mail: 18354288361@163.com

Yongqiang Mu

School of Environmental and
Municipal Engineering,
Qingdao University of Technology,
Qingdao 266033, Shandong, China
e-mail: 1532306932@qq.com

Shouting Liu

School of Environmental and
Municipal Engineering,
Qingdao University of Technology,
Qingdao 266033, Shandong, China
e-mail: 15764240478@163.com

Jingkui Zhang

School of Environmental and
Municipal Engineering,
Qingdao University of Technology,
Qingdao 266033, Shandong, China
e-mail: zjk_neu@163.com

Huan Lin

School of Environmental and
Municipal Engineering,
Qingdao University of Technology,
Qingdao 266033, Shandong, China
e-mail: huanlin8302@gmail.com

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received January 14, 2017; final manuscript received March 23, 2017; published online July 25, 2017. Assoc. Editor: Jingchao Zhang.

J. Thermal Sci. Eng. Appl 10(1), 011012 (Jul 25, 2017) (5 pages) Paper No: TSEA-17-1016; doi: 10.1115/1.4036798 History: Received January 14, 2017; Revised March 23, 2017

The thermal transport in metallic thin films can be reduced by the electron scattering and there are very little available knowledge that can be used to explain the mechanism. In this work, we characterized the thermal and electron transport of 3.2 nm thin gold films coated on alginate fiber by the transient electrothermal (TET) technique. The results reveal that the thermal and electrical conductivities are reduced significantly from the respective values of bulk material by 76.2% and 93.9%. At the same time, the Lorenz number is calculated as 8.66 × 10−8 W Ω K−2 and it is almost three times increased from the value of bulk material. The intrinsic thermal diffusivity of alginate fiber is 3.25 × 10−7 m2 s−1 and the thermal conductivity is 0.51 W m−1 K−1.

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Figures

Grahic Jump Location
Fig. 1

(a) The experimental principle diagram of TET technology. (b) The theoretical fitting and experimental data of different thicknesses of gold films coated on alginate fiber. The upper one refers to the alginate fiber coated with six gold films. The lower one is the alginate fiber with one gold film. The normalized temperature rise of alginate fiber coated with one gold film goes up slower than that with six gold films. Consequently, the thermal diffusivity of alginate fiber coated with one gold film is smaller than the value with six gold films. The inset is the SEM image of 3.2-nm thick gold film coated on alginate fiber.

Grahic Jump Location
Fig. 2

(a) The change of effective thermal diffusivity of alginate fiber coated with 3.2-nm thick gold layer against the reciprocal of resistance. (b) The variation of effective thermal diffusivity with the number of 3.2-nm gold films coated on alginate fiber. (c) The change of reciprocal of resistance with the number of 3.2-nm gold films coated on alginate fiber. The error bars in measuring Lorenz number and electrical and thermal conductivities are shown in the figure.

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