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báo cáo hóa học: " Structural and thermal studies of silver nanoparticles and electrical transport study of their thin films"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Structural and thermal studies of silver nanoparticles and electrical transport study of their thin films | Majeed Khan et al. Nanoscale Research Letters 2011 6 434 http www.nanoscalereslett.eom content 6 1 434 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Structural and thermal studies of silver nanoparticles and electrical transport study of their thin films Mohd Abdul Majeed Khan 1 Sushil Kumar2 Maqusood Ahamed1 Salman A Alrokayan1 and Mohammad Saleh AlSalhi1 3 Abstract This work reports the preparation and characterization of silver nanoparticles synthesized through wet chemical solution method and of silver films deposited by dip-coating method. X-ray diffraction XRD field emission scanning electron microscopy FESEM field emission transmission electron microscopy FETEM high-resolution transmission electron microscopy HRTEM selected area electron diffraction SAED and energy dispersive spectroscopy EDX have been used to characterize the prepared silver nanoparticles and thin film. The morphology and crystal structure of silver nanoparticles have been determined by FESEM HRTEM and FETEM. The average grain size of silver nanoparticles is found to be 17.5 nm. The peaks in XRD pattern are in good agreement with that of face-centered-cubic form of metallic silver. TGA DTA results confirmed the weight loss and the exothermic reaction due to desorption of chemisorbed water. The temperature dependence of resistivity of silver thin film determined in the temperature range of 100-300 K exhibit semiconducting behavior of the sample. The sample shows the activated variable range hopping in the localized states near the Fermi level. Keywords Silver nanoparticles thin film XRD FESEM FETEM Electrical properties Introduction Metal nanoparticles with at least one dimension approximately 1-100 nm have received considerable attention in both scientific and technological areas due to their unique and unusual physico-chemical properties compared with that of bulk materials 1 . Phenomena at the nanoscale are likely to be a completely new world where .