Far-infrared conductivity of CuS nanoparticles measured by terahertz time-domain spectroscopy

doi:10.1088/1674-1056/19/4/043302

Abstract This paper reports that terahertz time-domain spectroscopy is used to measure the optical properties of CuS nanoparticles in composite samples. The complex conductivity of pure CuS nanoparticles is extracted by applying the Bruggeman effective medium theory. The experimental data are consistent with the Drude--Smith model of conductivity in the range of 0.2--1.5 THz. The results demonstrate that carriers become localized with a backscattering behaviour in small-size nanostructures. In addition, the time constant for the carrier scattering is obtained and is only 64.3 fs due to increased electron interaction with interfaces and grain boundaries.

Keywords: terahertz time-domain spectroscopy conductivity effective medium theory Drude--Smith model

Received: 28 July 2009
Revised: 14 August 2009
Accepted manuscript online:

PACS:	78.67.Bf	(Nanocrystals, nanoparticles, and nanoclusters)
	73.63.Bd	(Nanocrystalline materials)
	78.70.Gq	(Microwave and radio-frequency interactions)
	61.72.Mm	(Grain and twin boundaries)
	78.20.Ci	(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))

Fund: Project supported by the Research Foundation of the State Ethnic Affairs Commission of People's Repulic of China (Grant No.~09ZY012), the National Natural Science Foundation of China (Grant No.~10904176), the ``Project 985'', and the ``Project 211'' of Mi

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Yang Yu-Ping(杨玉平), Zhang Zhen-Wei(张振伟), Shi Yu-Lei(施宇蕾), Feng Shuai(冯帅), and Wang Wen-Zhong(王文忠) Far-infrared conductivity of CuS nanoparticles measured by terahertz time-domain spectroscopy 2010 Chin. Phys. B 19 043302

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Far-infrared conductivity of CuS nanoparticles measured by terahertz time-domain spectroscopy

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