Journal
JOURNAL OF APPLIED PHYSICS
Volume 105, Issue 8, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3111971
Keywords
bonds (chemical); cadmium compounds; filled polymers; II-VI semiconductors; nanocomposites; nanowires; Raman spectra; surface phonons; transmission electron microscopy; valence bands; wide band gap semiconductors; X-ray photoelectron spectra
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Funding
- Department of Science and Technology, Government of India
- Council of Scientific and Industrial Research, Government of India
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CdS nanocomposites have been grown in polyvinyl alcohol matrix by a chemical synthesis process. The transmission electron micrographs of nanocomposites synthesized at 70-90 degrees C temperature showed the growth of needlelike and junctionlike nanostructures. X-ray photoelectron spectroscopy analysis revealed the growth of stoichiometric CdS without the formation of any intermediate phases at the CdS-polyvinyl alcohol interface. Raman spectra of first order longitudinal optical phonon peak has been analyzed using phonon dispersion model to detect the surface phonon modes in CdS nanoneedles and wires. The origin of negative differential resistance behavior in current-voltage characteristics for junctionlike CdS nanocomposites has been discussed.
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