Linear and Nonlinear Optical Properties of Mercaptoacetic Acid-Capped CdTe Nanoparticles by Z-Scan Technique
CdTe nanocrystals were synthesized by wet chemical route using potassium tellurite and cadmium chloride as starting materials in the presence of mercaptoacetic acid (MAA) as capping agent at pH ≈ 11.2. The effect of precursors molar ratio on the synthesis of these nanocrystalline samples was measured using UV-Visible absorption, photoluminescence and nonlinear optical analysis. By increasing Cd/Te molar ratio the emission wavelength in the photoluminescence shifted to higher energies. The CdTe nanocrystallites have a radius of approximately 3.22 nm and interesting photophysical properties. Z-scan studies were carried out to measure the sign and magnitude of the optical nonlinearity of CdTe nanoparticles. The calculated values of n 2, β and χ (3) from Z-scan measurements are –5.45 × 10–9 cm2/W, –1.048 × 10–4 cm/W and 24.64 × 10–6 esu, respectively. The synthesized CdTe nanoparticles were characterized with XRD, FT-IR analysis and optical non- linearity studies and the results are discussed.
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Document Type: Short Communication
Publication date: October 1, 2011
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