A Nexafs Study of Nitric Oxide Layers Adsorbed from a nitrite Solution onto a Pt(111) Surface

TL;DR

This study uses NEXAFS, XPS, LEED, and STM to analyze nitric oxide adsorption on Pt(111) from a nitrite solution, revealing non-ordered structures, adsorption through N atoms, and co-adsorption of nitrite and nitrogen species.

Contribution

It provides new insights into NO adsorption behavior from solution on Pt(111), including adsorption geometry and coverage, compared to UHV conditions.

Findings

NO adsorbs through N atom in upright conformation

Maximum coverage is about 0.3 monolayers

No long-range order observed in adsorbed layers

Abstract

NO molecules adsorbed on a Pt(111) surface from dipping in an acidic nitrite solution are studied by near edge X-ray absorption fine structure spectroscopy (NEXAFS), X-ray photoelectron spectroscopy (XPS), low energy electron diffraction (LEED) and scanning tunnelling microscopy (STM) techniques. LEED patterns and STM images show that no long range ordered structures are formed after NO adsorption on a Pt(111) surface. Although the total NO coverage is very low, spectroscopic features in N K-edge and O K-edge absorption spectra have been singled out and related to the different species induced by this preparation method. From these measurements it is concluded that the NO molecule is adsorbed trough the N atom in an upright conformation. The maximum saturation coverage is about 0.3 monolayers, and although nitric oxide is the major component, nitrite and nitrogen species are slightly co-adsorbed on the surface. The results obtained from this study are compared with those previously reported in the literature for NO adsorbed on Pt(111) under UHV conditions.