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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.
Highlights
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]
The fine powder of silver nanoparticles has been dispersed in ethanol on a carbon coated copper grid and TEM images were obtained with ultra-high resolution field emission transmission electron microscopy (FETEM) (JEOL, JEM-2100F) at an accelerating voltage of 200 kV
From the fitted values of To, we have found the value of density of states at the Fermi level N(EF) approximately 3.732 × 1024 eV-1 m-3 for silver nanoparticles
Summary
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]. A lot of researches have been focused on silver nanoparticles because of their important scientific and technological applications in color filters [13,14], optical switching [15], optical sensors [16,17], and especially in surfaceenhanced Raman scattering [18,19,20] Such properties and applications strongly depend on the morphology, crystal structure, and dimensions of silver nanostructures. The precipitate has been collected and powdered finely, and identified as silver nanoparticles using characterization tools These silver nanoparticles have been re-dispersed in ethanol for the preparation of silver film. The fine powder of silver nanoparticles has been dispersed in ethanol on a carbon coated copper grid and TEM images were obtained with ultra-high resolution FETEM (JEOL, JEM-2100F) at an accelerating voltage of 200 kV. The temperature was measured by mounting a calibrated copper-constantan thermocouple near the sample
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