A Powerful Method to Describe Transport Properties of Nano and Bio Materials

Di Sia, Paolo; Dallacasa, Valerio; Dallacasa, Filippo

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Home > Journal of Nano Research > Journal of Nano Research Vol. 11 > A Powerful Method to Describe Transport Properties...

Paper Title:

A Powerful Method to Describe Transport Properties of Nano and Bio Materials

Periodical	Journal of Nano Research (Volume 11)
Main Theme	Journal of Nano Research Vol. 11
Pages	45-56
DOI	10.4028/www.scientific.net/JNanoR.11.45
Citation	Paolo Di Sia et al., 2010, Journal of Nano Research, 11, 45
Online since	May, 2010
Authors	Paolo Di Sia, Valerio Dallacasa, Filippo Dallacasa
Keywords	Nanostructure, Biofluid, Correlation Functions, Diffusion, Frequency Dependent Conductivity, Semiconducting Oxide
Price	US$ 28,-

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Abstract

A key factor for the efficiency in nanostructured devices is charge transport. Despite considerable attention to this subject, the precise nature of transport processes in these systems has remained unresolved. To understand the microscopic aspects of carrier dynamics, we suggest a method for the calculation of correlation functions. They can be expressed as the Fourier transform of a kernel containing the frequency-dependent conductivity (). We present results for the velocity correlation functions , the mean square deviation of position R2 = <[R(t)-R(o)]2> and the diffusion coefficient D = (R2/t) in materials, like TiO2, ZnO, Si, for which a Drude-Lorentz description or its generalizations applies with a good agreement with experiments. We find that D = 0, indicating absence of diffusion at long times, except in the Drude case (o = 0). For small times t/ < 1, however, diffusion can occur even when o 0, within a limited region of size increasing with the value of o. The quantum mechanical extension of this method allows applications for the nanodiffusion in nanostructured, porous and cellular materials, as for biological, medical and nanopiezotronic devices.