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Structural and thermal studies of silver nanoparticles and electrical transport study of their thin films

Majeed Khan MA, Kumar S, Ahamed M, Alrokayan SA, Alsalhi MS - Nanoscale Res Lett (2011)

Bottom Line: The average grain size of silver nanoparticles is found to be 17.5 nm.TGA/DTA results confirmed the weight loss and the exothermic reaction due to desorption of chemisorbed water.The sample shows the activated variable range hopping in the localized states near the Fermi level.

Affiliation: King Abdullah Institute for Nanotechnology, King Saud University, Riyadh-11451, Saudi Arabia. majeed_phys@rediffmail.com.

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.

FESEM image of silver nanoparticles and inset shows EDX profile for the same.
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Figure 2: FESEM image of silver nanoparticles and inset shows EDX profile for the same.

Mentions: Figure 2 shows the FESEM image of silver nanoparticles. It exhibits that almost all the nanoparticles are of spherical shape with no agglomeration. FETEM and HRTEM images of the same sample are shown in Figure 3a, b, respectively. Figure 3a shows that silver nanoparticles are spherical in shape having smooth surface and are well dispersed. The average diameter of silver nanoparticles is found to be approximately 35 nm. TEM image also shows that the produced nanoparticles have more or less narrow size distribution. HRTEM image (Figure 3b) has given us further insight into the microstructure and crystallinity of as-prepared silver nanoparticles. The clear and uniform lattice fringes confirmed that the spherical particles are highly crystallized. The lattice spacing of 0.232 nm corresponds to (111) planes of silver. The results show that the dominant faces of silver spheres are (111). The SAED pattern has been obtained by directing the electron beam perpendicular to one of the spheres. The hexagonal symmetry of diffraction spots pattern shown in the inset of Figure 3b confirmed that the spherical particles are well crystalline, and its face is indexed to (111) planes. Both HRTEM image and SAED pattern confirmed that the prepared spherical silver nanoparticles are single crystals.

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Structural and thermal studies of silver nanoparticles and electrical transport study of their thin films

Majeed Khan MA, Kumar S, Ahamed M, Alrokayan SA, Alsalhi MS - Nanoscale Res Lett (2011)

FESEM image of silver nanoparticles and inset shows EDX profile for the same.
© Copyright Policy - open-access
Figure 2: FESEM image of silver nanoparticles and inset shows EDX profile for the same.
Mentions: Figure 2 shows the FESEM image of silver nanoparticles. It exhibits that almost all the nanoparticles are of spherical shape with no agglomeration. FETEM and HRTEM images of the same sample are shown in Figure 3a, b, respectively. Figure 3a shows that silver nanoparticles are spherical in shape having smooth surface and are well dispersed. The average diameter of silver nanoparticles is found to be approximately 35 nm. TEM image also shows that the produced nanoparticles have more or less narrow size distribution. HRTEM image (Figure 3b) has given us further insight into the microstructure and crystallinity of as-prepared silver nanoparticles. The clear and uniform lattice fringes confirmed that the spherical particles are highly crystallized. The lattice spacing of 0.232 nm corresponds to (111) planes of silver. The results show that the dominant faces of silver spheres are (111). The SAED pattern has been obtained by directing the electron beam perpendicular to one of the spheres. The hexagonal symmetry of diffraction spots pattern shown in the inset of Figure 3b confirmed that the spherical particles are well crystalline, and its face is indexed to (111) planes. Both HRTEM image and SAED pattern confirmed that the prepared spherical silver nanoparticles are single crystals.

Bottom Line: The average grain size of silver nanoparticles is found to be 17.5 nm.TGA/DTA results confirmed the weight loss and the exothermic reaction due to desorption of chemisorbed water.The sample shows the activated variable range hopping in the localized states near the Fermi level.

Affiliation: King Abdullah Institute for Nanotechnology, King Saud University, Riyadh-11451, Saudi Arabia. majeed_phys@rediffmail.com.

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.

View Similar Images In: Results  - Collection
View Article: PubMed Central - HTML -  PubMed
Show All Figures - Show MeSH
getmorefigures.php?pmc=3211852&rFormat=json&query=null&req=5