Gold Spherical and Flake Assemblies Fabrication Through Calcination of Gold Nanoparticles Incorporated Poly(acrylonitril
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ORIGINAL PAPER
Gold Spherical and Flake Assemblies Fabrication Through Calcination of Gold Nanoparticles Incorporated Poly(acrylonitrile) Nanofibers Amir Shahin Shamsabadi1,2 • Hossein Tavanai1,2 • Mehdi Ranjbar2,3 Received: 9 April 2020 Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract This work reports on the outcome of the calcination of gold nanoparticles incorporated polyacrylonitrile nanofibers in air which results in the formation of gold spherical and flake cluster assemblies. The architecture and morphology of gold nanostructures play a role in determining their different applications. The results of this research showed that calcination at 650 C for 5 h led to almost complete disintegration and disappearance of the poly(acrylonitrile) matrix and polyhedral nanostructures were formed. FTIR analysis showed the complete disappearance of poly(acrylonitrile) matrix at calcination temperatures of 850 C and 1000 C. XRD analysis also showed the complete disappearance of poly(acrylonitrile) at calcination temperatures above 850 C. SEM micrographs taken after calcination of the precursor showed that calcination around 850 C leads to the formation of spherical gold clusters, whereas, calcination at 1000 C produces gold flake clusters. Keywords Gold nanoflakes Gold nanoparticles Calcination Electrospun nanofibers Poly(acrylonitrile)
Introduction Synthesis, characteristics and applications of gold nanostructures have been investigated intensively in order to exploit their electrical and optical properties. Apart from their high surface area and as a result, high amount of surface atoms, gold nanostructures enjoy chemical, physical and thermal stability as well as biocompatibility. It must be pointed out that among metal nanostructures, gold ones have been the most favored. Surface enhanced Raman scattering (SERS), localized surface plasmon resonance (LSPR) and highly enhanced fluorescence intensity constitute the main optical characteristics of gold nanostructures, which can be significantly affected by their & Hossein Tavanai [email protected] 1
Department of Textile Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
2
Research Institute for Nanotechnology and Advanced Materials, Isfahan University of Technology, Isfahan 84156-83111, Iran
3
Department of Physics, Isfahan University of Technology, Isfahan 84156-83111, Iran
morphology [1–6]. It must be pointed out that different architecture and morphology of gold nanostructures play a role in determining their different applications such as sensors, electrodes, catalysis, batteries, superconductors and biological devices [7–12]. For example, UV adsorption of gold nanorods can be tailored by changing their aspect ratio [7, 13] or morphology of gold nanostructures has shown to affect their LSPR and SERS characteristics [14–16] or the catalytic activity of gold nanostructures has proved to be influenced by their size, morphology and crystalline phase
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