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Materials 2017, 10(4), 402;

Structural and Optical Properties of Ag Nanoparticles Synthesized by Thermal Treatment Method

Department of Physics, Faculty of Science, University of Putra Malaysia (UPM), Serdang 43400, Selangor, Malaysia
Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA
Authors to whom correspondence should be addressed.
Academic Editor: Ilaria Fratoddi
Received: 26 December 2016 / Revised: 12 March 2017 / Accepted: 15 March 2017 / Published: 12 April 2017
(This article belongs to the Special Issue Noble Metal Nanoparticles)
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The modified thermal treatment method via alternate oxygen and nitrogen flow was successfully employed to synthesize very narrow and pure Ag nanoparticles. The structural and optical properties of the obtained metal nanoparticles at different calcination temperatures between 400 and 800 °C were studied using various techniques. The FTIR and EDX confirmed the formation of Ag nanoparticles without a trace of impurities. The XRD spectra revealed that the amorphous sample at 30 °C had transformed into the cubic crystalline nanostructures at the calcination temperature of 400 °C and higher. The TEM images showed the formation of spherical Ag nanoparticles in which the average particle size decreased with increasing calcination temperature from 7.88 nm at 400 °C to 3.29 nm at 800 °C. The optical properties were determined by UV-vis absorption spectrophotometer, which showed an increase in the conduction band of Ag nanoparticles with increasing calcination temperature from 2.75 eV at 400 °C to 3.04 eV at 800 °C. This was due to less attraction between conduction electrons and metal ions as the particle size decreases in corresponding to fewer numbers of atoms that made up the metal nanoparticles. View Full-Text
Keywords: Ag nanoparticles; conduction electrons; conduction bands; thermal treatment method Ag nanoparticles; conduction electrons; conduction bands; thermal treatment method

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Gharibshahi, L.; Saion, E.; Gharibshahi, E.; Shaari, A.H.; Matori, K.A. Structural and Optical Properties of Ag Nanoparticles Synthesized by Thermal Treatment Method. Materials 2017, 10, 402.

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