Abstract
The investigation of the new class of the semi-insulating materials, namely, asbestoses filled with nanoscaled components using the non-steady-state photoelectromotive force (photo-EMF) technique is the main goal of this paper.The non-steady-state photo-EMF technique based on the detection of the alternating electric current arising in the sample illuminated by an oscillating interference pattern is the most versatile and advanced method. The photo-EMF technique allows determination of the number of photoelectric parameters (conductivity, carrier sign, lifetime, diffusion length, and drift mobility), and can be applied for the investigation of both non-centrosymmetric and centrosymmetric media. The experimental arrangement used for the investigation of the non-steady-state photo-EMF in polypyrrole nanostructures within chrysotile asbestos is shown in Fig. 1. The light from the conventional Nd: YAG (λ=532 nm, Pout, = 2 mW) laser was split into two beams forming interference pattern with spatial frequency' K and contrast m=0.97 on the sample’s surface. The signal beam was phase modulated with frequency ω and amplitude Δ=0.81 by the electrooptic modulator ML-102A. The photocurrent arising in the sample generated the corresponding voltage on the load resistor RL =9.1 Ω which then was amplified and measured with the lock-in nanovoltmeter Unipan-232B.
© 2007 IEEE
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