Creation of Gold Nanoparticles in ZnO by Ion Implantation-DFT and Experimental Studies

• Published in: Nanomaterials (Basel, Switzerland) Switzerland), 2020-11, Vol.10 (12), p.2392
• Main Authors: Cajzl, Jakub, Jeníčková, Karla, Nekvindová, Pavla, Michalcová, Alena, Veselý, Martin, Macková, Anna, Malinský, Petr, Jágerová, Adéla, Mikšová, Romana, Akhmadaliev, Shavkat
• Format: Article
• Language: English
• Subjects: DFT; gold; ion implantation; luminescence; nanoparticles; ZnO
• ISSN: 2079-4991; 2079-4991
• DOI: 10.3390/nano10122392

Three different crystallographic orientations of the wurtzite ZnO structure (labeled as -plane, -plane and -plane) were implanted with Au ions using various energies and fluences to form gold nanoparticles (GNPs). The ion implantation process was followed by annealing at 600 °C in an oxygen atmosphere to decrease the number of unwanted defects and improve luminescence properties. With regard to our previous publications, the paper provides a summary of theoretical and experimental results, i.e., both DFT and FLUX simulations, as well as experimental results from TEM, HRTEM, RBS, RBS/C, Raman spectroscopy and photoluminescence. From the results, it follows that in the ZnO structure, implanted gold atoms are located in random interstitial positions -experimentally, the amount of interstitial gold atoms increased with increasing ion implantation fluence. During ion implantation and subsequent annealing, the metal clusters and nanoparticles with sizes from 2 to 20 nm were formed. The crystal structure of the resulting gold was not cubic (confirmed by diffraction patterns), but it had a hexagonal close-packed ( ) arrangement. The ion implantation of gold leads to the creation of Zn and O interstitial defects and extended defects with distinct character in various crystallographic cuts of ZnO, where significant O-sublattice disordering occurred in -plane ZnO.