Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance upgrade on Thursday 4th of May 2017 from 8.00am to 9.00am (BST).

During this time our websites will be offline temporarily. If you have any questions please use the feedback button on this page. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 6, 2007
Previous Article Next Article

Electronic properties of Ag nanoparticle arrays. A Kelvin probe and high resolution XPS study

Author affiliations

Abstract

The electronic properties of citrate stabilised Ag nanoparticles with sizes ranging from 4 to 35 nm were investigated by the Kelvin probe method and high resolution XPS. Two and three dimensional assemblies of the particles were prepared by electrostatic adsorption from aqueous solution onto poly-L-lysine modified surfaces. The work function of the Ag particles increased from 5.29 ± 0.05 to 5.53 ± 0.05 eV as the particle size decreased. These values are approximately 0.8 eV higher than for clean polycrystalline Ag surfaces. The origin of these remarkable high work functions cannot be explained in terms of either citrate induced changes in the surface dipole or image forces in the confined metallic domains. High resolution XPS spectra of the Ag 3d5/2 core level were characterised by broad bands and a 0.4 eV shift towards lower binding energies for the smallest particles. Comparisons with reported studies on extended Ag surfaces indicate that as-grown particles exhibit partially oxidised surfaces. The behaviour of the work function further suggests that the strength of the Ag–O bonding increases with decreasing particle sizes. These findings are highly relevant to the interpretation of the catalytic properties of Ag nanoparticles.

Graphical abstract: Electronic properties of Ag nanoparticle arrays. A Kelvin probe and high resolution XPS study

Back to tab navigation
Please wait while Download options loads

Publication details

The article was received on 09 Aug 2006, accepted on 27 Nov 2006 and first published on 15 Dec 2006


Article type: Paper
DOI: 10.1039/B611496B
Citation: Phys. Chem. Chem. Phys., 2007,9, 725-730
  •   Request permissions

    Electronic properties of Ag nanoparticle arrays. A Kelvin probe and high resolution XPS study

    M. Schnippering, M. Carrara, A. Foelske, R. Kötz and D. J. Fermín, Phys. Chem. Chem. Phys., 2007, 9, 725
    DOI: 10.1039/B611496B

Search articles by author