Document Details

Document Type : Article In Journal 
Document Title :
Structure and optoelectronic properties of PbSe quantum dots /PVA. Does the polymer molecular weight matter?
Structure and optoelectronic properties of PbSe quantum dots /PVA. Does the polymer molecular weight matter?
 
Subject : Physics 
Document Language : English 
Abstract : Polyvinyl alcohol (PVA) with different molecular weights (8000, 14,000, and 132,000g/mol) capped lead selenide (PbSe) quantum dots (QDs) are prepared. The nanocomposites are characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). XRD and TEM studies show that the particle size of PbSe QDs decrease with the increase in PVA molecular weight and/or PVA amount. This may be due to the increase in molecular weight inhibiting further growth of PbSe into the polymer matrix. Thermogravimetric analysis showed that the introduction of PbSe QDs into PVA decreases the crystallinity of the polymer. The optical absorption spectroscopy of prepared nanocomposites showed that the absorption peaks are strongly shifted to the lower wavelength (blue shift) from near infrared region to visible region by increasing the PVA molecular weight. The (I-V) characteristic curves of the PVA/PbSe nanocomposite films under illumination showed a photovoltaic cell-like behavior. The results indicated that as the molecular weight of polymer increases, the conversion efficiency increases. 
ISSN : 1042-7147 
Journal Name : Polymers for Advanced Technologies 
Volume : 22 
Issue Number : 12 
Publishing Year : 1432 AH
2011 AD 
Article Type : Article 
Added Date : Wednesday, February 8, 2012 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
وليد السيد محمودMahmoud, Waleed EResearcherDoctoratew_e_mahmoud@yahoo.com

Files

File NameTypeDescription
 32222.pdf pdfAbstract

Back To Researches Page