Photoluminescence study of PVP capped CdS nanoparticles embedded in PVA matrix

Journal Article · Thu May 03 04:00:00 EDT 2007 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2006.08.029· OSTI ID:21000629

Pattabi, Manjunatha ^[1]; Saraswathi Amma, B ^[1]; Manzoor, K ^[2]

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1. Department of Materials Science, Mangalore University, Mangalagangotri 574199 (India)
2. Defence Laboratory, Jodhpur 342011 (India)

Photoluminescence properties of polyvinyl pyrrolidone (PVP) capped cadmium sulphide (CdS) nanoparticles embedded in polyvinyl alcohol matrix (PVA) are reported. The PVP-CdS nanoparticles are prepared by non-aqueous method wherein cadmium nitrate is used as the cadmium source and hydrogen sulphide as the sulphur source. The synthesized nanoparticles are dispersed in polyvinyl alcohol (PVA) matrix and cast as self-standing flexible (PVP-CdS)-PVA films. The nanocomposites are characterized by optical absorption spectroscopy, X-ray diffraction (XRD) and transmission electron microscopy (TEM) studies. XRD and TEM studies show the formation of cubic CdS particles with average size {approx}3-5 nm. Thermal studies, carried out to observe the changes in PVA matrix due to the incorporation of PVP-CdS nanoparticles show strong interaction between the polymer matrix and nanoparticles. The photoluminescence emission spectra of the nanocomposites show two peaks, at 502 and 636 nm, which are attributed to the band edge and surface defects respectively, of CdS nanoparticles. Effective surface capping with optimum concentration of polyvinyl pyrrolidone leads to the quenching of surface defect-related emission.

• OSTI ID: 21000629
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 5 Vol. 42; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
CADMIUM
CADMIUM NITRATES
CADMIUM SULFIDES
COMPOSITE MATERIALS
EMISSION SPECTRA
HYDROGEN SULFIDES
NANOSTRUCTURES
OPTICAL PROPERTIES
PHOTOLUMINESCENCE
PVA
PVP
QUENCHING
STRONG INTERACTIONS
SULFUR
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION