Core-shell like Au-Ir nanoparticles with spatially variant electronic state of Au synthesized by femtosecond laser irradiation of solution

Teppei Nishi, Yuichiro Hayasaka, Takahiro Nakamura, Takeshi Morikawa, Shunichi Sato

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In this work, nanoparticles were obtained via laser-induced nucleation. Specifically, the fabrication of Au-Ir core-shell like nanoparticles was demonstrated, based on the femtosecond laser irradiation of aqueous solution of HAuCl 4 and H 2 IrCl 6 . UV–vis transmission spectra showed that the metal ions were reduced and nanoparticles were generated in response to the laser irradiation of these solutions. In addition, elemental mapping by energy dispersive X-ray spectroscopy confirmed a core (Ir)-shell (Au) in which a portion of the Ir was exposed to the surface. The formation of this nanostructure is ascribed to the relative probabilities of interactions between the incident laser light and the two types of anions. Electron energy loss spectroscopy demonstrated that the electronic states in the Au region of Au7Ir3 core-shell like nanoparticles were quite different from those of pure Au nanoparticles and also exhibited spatial variations. We propose that the strain at the Au/Ir interface induced by a lattice mismatch could be responsible for the spatial variation of the electronic states.

Original languageEnglish
Pages (from-to)1044-1049
Number of pages6
JournalApplied Surface Science
Volume457
DOIs
Publication statusPublished - 2018 Nov 1

Keywords

  • EELS
  • Electronic state
  • Femtosecond laser
  • Nanoparticle

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Fingerprint Dive into the research topics of 'Core-shell like Au-Ir nanoparticles with spatially variant electronic state of Au synthesized by femtosecond laser irradiation of solution'. Together they form a unique fingerprint.

Cite this