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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.The peaks in XRD pattern are in good agreement with that of face-centered-cubic form of metallic silver.The sample shows the activated variable range hopping in the localized states near the Fermi level.

View Article: PubMed Central - HTML - PubMed

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.

No MeSH data available.


Related in: MedlinePlus

DTA-TGA themogram of silver nanoparticles.
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Figure 4: DTA-TGA themogram of silver nanoparticles.

Mentions: TGA and DTA spectra have been recorded in temperature range from room temperature to 700°C using simultaneous thermal system (Shimadzu, DTG-60). A ceramic (Al2O3) crucible was used for heating and measurements were carried out in nitrogen atmosphere at the heating rate of 10°C/min. TGA and DTA curves of powder silver nanoparticles are given in Figure 4. It is observed from TGA curve that dominant weight loss of the sample occurred in temperature region between 200 and 300°C. There is almost no weight loss below 200°C and above 300°C. It can be generally attributed to the evaporation of water and organic components. Overall, TGA results show a loss of 14.58% upto 300°C. DTA plot displays an intense exothermic peak between 200°C and 300°C which mainly attributed to crystallization of silver nanoparticles. DTA profiles show that complete thermal decomposition and crystallization of the sample occur simultaneously.


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)

DTA-TGA themogram of silver nanoparticles.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211852&req=5

Figure 4: DTA-TGA themogram of silver nanoparticles.
Mentions: TGA and DTA spectra have been recorded in temperature range from room temperature to 700°C using simultaneous thermal system (Shimadzu, DTG-60). A ceramic (Al2O3) crucible was used for heating and measurements were carried out in nitrogen atmosphere at the heating rate of 10°C/min. TGA and DTA curves of powder silver nanoparticles are given in Figure 4. It is observed from TGA curve that dominant weight loss of the sample occurred in temperature region between 200 and 300°C. There is almost no weight loss below 200°C and above 300°C. It can be generally attributed to the evaporation of water and organic components. Overall, TGA results show a loss of 14.58% upto 300°C. DTA plot displays an intense exothermic peak between 200°C and 300°C which mainly attributed to crystallization of silver nanoparticles. DTA profiles show that complete thermal decomposition and crystallization of the sample occur simultaneously.

Bottom Line: 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.The sample shows the activated variable range hopping in the localized states near the Fermi level.

View Article: PubMed Central - HTML - PubMed

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.

No MeSH data available.


Related in: MedlinePlus