Synthesis of Mixed AuZn Nanoparticles by Spark Discharge Technique
- PDF / 470,503 Bytes
- 9 Pages / 432 x 648 pts Page_size
- 80 Downloads / 159 Views
MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.221
Synthesis of Mixed AuZn Nanoparticles by Spark Discharge Technique Shubhra Kala1,a) and F. E. Kruis2 1 Department of Physics, H.N.B. Garhwal (a central) University, Srinagar (Garhwal) Uttarakhand, 246174, India
2 Institute for Nanostructures and Technology, Faculty of Engineering Science, University of DuisburgEssen, Duisburg, 47057, Germany
Abstract
In this study, feasibility of spark discharge technique to generate mixed metal nanoparticles is demonstrated. Two immiscible metals Au and Zn are selected to prepare AuZn mixed nanoparticles. Ignition of spark between Au and Zn electrodes under normal pressure, in the presence of carrier gas, leads to formation of mixed nanoparticles by condensation and nucleation. Online particle size-distribution is monitored by a scanning mobility particle sizer on changing carrier gas flow rate and capacitor charging current during co-sparking between Au and Zn electrodes. The technique provides flexibility to generate binary mixture of AuZn nanoparticles in the size range of 10-80 nm. Distribution of Au and Zn in the prepared mixed nanoparticles is mapped by scanning electron microscopy and high resolution electron microscopy. a)
Corresponding author: [email protected]
1621
Downloaded from https://www.cambridge.org/core. Rice University, on 19 Aug 2019 at 10:04:19, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1557/adv.2019.221
INTRODUCTION Au based bimetallic and metallic-semiconducting alloy nanoparticles are widely applicable due to modifications of optical properties and improvements in catalytic activity. Besides these, Au is widely used as a seed particle for growing nanowires and nanotubes in pristine and alloyed forms. [1] Phase diagram on nanoscale for observing alloying ability and phase stability due to size and surface effects is also reported in Au-Zn, Au-Pt, Au-Si and Au-Ge systems. [2] Different methods e.g., vapour quenching, co-deposition sputtering, mechanical alloying and ion-beam mixing have been reported to prepare mixed nanoparticles. [3, 4] Synthesis of mixed metal nanoparticles of Ag-Cu, Au–Pt, Au-Pd, Ag-Pd, Au-Ge, Pd-Pt, Cu-W and Cr-Co, has been carried for different applications. [5-12] Ag-Cu nanoparticles were found suitable as conductive fillers in electrically conductive adhesives due to high electrical conductivity of Ag and low electrical migration of Cu. [5, 6]. Due to selective hydrogenation catalytic activity, Au–Pt nanoparticles can be utilized in various reactions [6, 8]. Cu-W composites, in which Cu possesses high thermal and electrical conductivities and W exhibits the low thermal expansion coefficient, can be a good candidate as heat sinks in electronic packages. [9] Mixed nanoparticles of Co–Cr have been synthesized so that it can find application in longitudinal high-density recording media. [10, 11] In the above mentioned reports, many synthesized mixed nanoparticles are immiscible in their
Data Loading...
