Correlation of Silver Size Nanoparticles Between TEM and QELS
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Correlation of Silver Size Nanoparticles Between TEM and QELS A. Ruíz-Baltazar1, A. Escobedo2, U. Pal2, R. Pérez,3 and G. Rosas.1 1
2
Instituto de Investigaciones Metalúrgicas, UMSNH, Edificio U, Ciudad Universitaria, CP 58060, Morelia Michoacán, MEXICO.
Instituto de Física, BUAP, Edif. 14, Ciudad Universitaria, C.P. 72570, Puebla, Puebla, MÉXICO. 3
Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, P.O. Box 48-3, Cuernavaca, Morelos, 62251, MEXICO. Email: [email protected]
ABSTRACT In this work, silver nanoparticles were synthesized by two methods: polyol and chemical reduction using sodium borohydride (NaBH4). In both cases, silver nitrate was employed as starting metallic salt and Poly-vinyl pyrrolidone (PVP) as surfactant agent. The average nanoparticles size was correlated by transmission electron microscopy (TEM) and quasielastic light scattering (QELS). The experimental results indicate that the average particle sizes measured by QELS were slightly higher than those obtained directly by TEM. Therefore, this work confirms that the QELS technique can give rapid and approximate average-particle size values in comparison with those obtained through TEM direct observations. Keywords: Ag, chemical synthesis, transmission electron microscopy (TEM), nanoscale, nanostructure. INTRODUCTION In recent years, synthesis and stabilization of nanoparticles has been subject to active investigation using different reducing agents. The physical and chemical properties of silver nanoparticles are promising for applications in catalysis, sensors, photoelectronics, and biomedicine [1]. Nanoparticles are defined as atomic arrangements with nanometric dimensions and usually with a small number of constituent atoms. Particles in the nano-regime are of immense importance due to their potential applications in different fields. The control of the size and the dispersion of nanometric metal particles have an important effect on their physical properties [2, 3]. Therefore, the synthesis and characterization of silver nanoparticles have attracted considerable attention from a fundamental and practical point of view. In particular, silver nanoparticles have received great interests due to their attractive catalytic, antibacterial, magnetic, and optical properties and potential applications in the fields of physics, chemistry, biology, medicine, and materials science and their different interdisciplinary fields [4, 5]. Silver nanoparticles have been obtained recently using different synthesis methods [6-8]. However, the chemical methods are reliable, simple to carry out, and available to control de size and shape of the small particles On the other hand, the structural determination of the nanoparticles becomes an important task to understand some of their properties [9-12]. In this scope, the use of the TEM and associated methods has been established as one of the main tools in the study of nanomaterials [13]. However, TEM characterization is usually slow, so that the use of
Mater. Res. Soc. Symp. P
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