Synthesis, characterization and optical properties of polymer-based ZnS nanocomposites.
Nanostructured polymer-semiconductor hybrid materials such as ZnS-poly(vinyl alcohol) (ZnS-PVA), ZnS-starch and ZnS-hydroxypropylmethyl cellulose (Zns-HPMC) are synthesized by a facile aqueous route. The obtained nanocomposites are characterized using various techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), UV/vis spectroscopy and photoluminescence (PL). XRD studies confirm the zinc blende phase of the nanocomposites and indicate the high purity of the samples. SEM studies indicate small nanoparticles clinging to the surface of a bigger particle. The Energy Dispersive Analysis by X-rays (EDAX) spectrum reveals that the elemental composition of the nanocomposites consists primarily of Zn:S. FTIR studies indicate that the polymer matrix is closely associated with ZnS nanoparticles. The large number of hydroxyl groups in the polymer matrix facilitates the complexation of metal ions. The absorption spectra of the specimens show a blue shift in the absorption edge. The spectrum reveals an absorption edge at 320, 310 and 325 nm, respectively. PL of nanocomposites shows broad peaks in the violet-blue region (420-450 nm). The emission intensity changes with the nature of capping agent. The PL intensity of ZnS-HPMC nanocomposites is found to be highest among the studied nanocomposites. The results clearly indicate that hydroxyl-functionalized HPMC is much more effective at nucleating and stabilizing colloidal ZnS nanoparticles in aqueous suspensions compared with PVA and starch.
Department of Chemistry, Government Lahiri College, Chirimiri, 497449, India.
A
A
Tiwari
Government College Seepat, Bilaspur 495555, India.
S A
SA
Khan
Department of Physics, Government E. R. R. PG Science College, Bilaspur, 495006, India.
R S
RS
Kher
Department of Physics, RTM Nagpur University, Nagpur, 440033, India.
S J
SJ
Dhoble
Department of Chemistry, Government E. R. R. PG Science College, Bilaspur, 495006, India.
A L S
ALS
Chandel
D065347:Hypromellose Derivatives / Q000737:chemistry; D053761:Nanocomposites / Q000737:chemistry*; D055620:Optical Phenomena; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D013213:Starch / Q000737:chemistry; D013440:Sulfides / Q000737:chemistry*; D017967:Zinc Compounds / Q000737:chemistry*
D013440:Sulfides; D017967:Zinc Compounds; D065347:Hypromellose Derivatives; D011142:Polyvinyl Alcohol; D013213:Starch; C031238:zinc sulfide
SEM-EDAX; UV/vis spectrum; ZnS-polymer nanocomposites; photoluminescence