On the high sensitivity of the electronic states of1 nm gold particles to pretreatments and modifiers

Oxana Anatolievna Martynyuk, Yulia Kotolevich, Rodrigo Vélez, Jesus Efren Cabrera Ortega, Hugo Tiznado, Trino Zepeda Partida, Josué D. Mota-Morales, Alexey Pestryakov, Nina Bogdanchikova

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6 Citations (Scopus)

Abstract

In this paper, the effect of modifiers and pretreatments on the electronic states of 1 nm gold nanoparticles (AuNPs) supported on silica was systematically studied. AuNPs deposited on silica (particle size of 2-4 nm) modified with Ce, La and Fe oxides, were studied by FTIR of adsorbed CO after different redox treatments at 100, 300 and 500 °C. This study was conducted at room temperature to allow detecting the electronic states of gold, which is more likely involved in CO oxidation at the same temperature. AuNP size distribution was measured by HRTEM. It is shown that the electronic state of gold species (Aunδ-, Au0 , Aunδ+ , Au+ ) in 1 nm AuNPs is sensitive to the modifier as well as to the temperatures of redox pretreatments. Supports modified with the same additives but containing larger AuNPs (3, 4, 5, and 7 nm) were also studied. They showed that Au0 remains stable irrespective of additives and redox pretreatments, indicating no significant effect of such treatments on the electronic properties of larger AuNPs. Samples with a predominant AuNP size of 2 nm are an intermediate case between these two groups of materials.

Original languageEnglish
Article number432
JournalMolecules
Volume21
Issue number4
DOIs
Publication statusPublished - 1 Apr 2016

Keywords

  • 1 nm gold
  • Electron stage of gold
  • FTIR CO
  • Sensitivity to pretreatment

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemistry (miscellaneous)
  • Molecular Medicine
  • Pharmaceutical Science
  • Drug Discovery
  • Physical and Theoretical Chemistry
  • Organic Chemistry

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  • Cite this

    Martynyuk, O. A., Kotolevich, Y., Vélez, R., Ortega, J. E. C., Tiznado, H., Partida, T. Z., Mota-Morales, J. D., Pestryakov, A., & Bogdanchikova, N. (2016). On the high sensitivity of the electronic states of1 nm gold particles to pretreatments and modifiers. Molecules, 21(4), [432]. https://doi.org/10.3390/molecules21040432