Abstract
Starch capped cadmium sulfide (CdS) nanoparticles were synthesized by aqueous solution precipitation. Starch added during the synthesis of nanoparticles resulted in cadmium-rich nanoparticles forming a stable complex with starch. The size of the CdS quantum dots was measured using high resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD). The average diameter (d) of nanoparticles spanned the range 4.8±0.4 to 5.7±0.2nm when the pH of the solution was varied within the range 10–14. The main Raman phonon of CdS, the longitudinal optical mode located around 300cm−1, softens as diameter decreases, in accordance with theoretical predictions. In addition, the largest Raman response of starch, near 478cm−1, related with the important skeletal vibration modes of the starch pyranose ring, dominates the spectra of the CdS capped nanoparticles and also softens as the size decreases. This fact indicates a strain variation on CdS as a function of d which increases as the pH increases.
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