The synthesis of Au-NPs by ion implantation in the crystalline GaN and characterisation of their optical properties

0565828 - ÚJF 2023 RIV FR eng C - Conference Paper (international conference)
Jagerová, Adéla - Flaks, Josef - Sofer, Z. - Vronka, Marek - Michalcová, A. - Macková, Anna
The synthesis of Au-NPs by ion implantation in the crystalline GaN and characterisation of their optical properties.
EPJ Web of Conferences. Vol. 261. Les ulis: EDP sciences, 2022, č. článku 01003. E-ISSN 2100-014X.
[Applied Nuclear Physics Conference (ANPC 2021). Prague (CZ), 12.09.2021-17.09.2021]
Research Infrastructure: CANAM II - 90056
Institutional support: RVO:61389005 ; RVO:68378271
Keywords : analytical methods * ion beam * material science
OECD category: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect); Condensed matter physics (including formerly solid state physics, supercond.) (FZU-D)
https://doi.org/10.1051/epjconf/202226101003

Nanostructured surfaces with embedded noble metal nanoparticles is an attractive way for manipulation with the optical properties of wide bandgap semiconductors applied in optoelectronics, photocatalytic processes or for Surface-Enhanced Raman spectroscopy. Ion implantation offers an effective way for nanoparticle preparation without the use of additional chemicals that offers precise control of nanoparticle depth distribution. The aim of this study is a synthesis of the gold nanoparticles in GaN by implantation of 1.85 MeV Au ions with high fluences up to 7×1016 cm-2 and study of optical properties of Au implanted GaN. Implanted crystals were annealed at 800 °C in an ammonia atmosphere for 20 min to support Au nanoparticle creation and GaN recovery. The structure characterisation has been realized by Rutherford backscattering spectroscopy in channelling mode and it showed the formation of two separated disordered regions – the surface region and buried layer. The lower implantation fluences induce damage mainly in a buried layer. However, the increase of the Au-ion fluence leads to the increase of surface disorder as well. Further, the increase of the Au-ion fluence induces the Au dopant shift to the surface and multimodal Audepth profiles. TEM analyses confirmed the formation of Au nanoparticles in the implanted samples after annealing with sizes up to 14 nm. The increase of light absorption and modification of GaN bandgap of the Au modified GaN was deduced from the change in optical transmission spectra between 370 – 1400 nm.
Permanent Link: https://hdl.handle.net/11104/0337316