CO and O2 Adsorption and CO Oxidation on Pt Nanoparticles by Indirect Nanoplasmonic Sensing

Benjamin Demirdjian; Igor Ozerov; Frédéric Bedu; Alain Ranguis; Claude R Henry

doi:10.1021/acsomega.1c01487

CO and O₂ Adsorption and CO Oxidation on Pt Nanoparticles by Indirect Nanoplasmonic Sensing

ACS Omega. 2021 May 12;6(20):13398-13405. doi: 10.1021/acsomega.1c01487. eCollection 2021 May 25.

Authors

Benjamin Demirdjian¹, Igor Ozerov¹, Frédéric Bedu¹, Alain Ranguis¹, Claude R Henry¹

Affiliation

¹ Aix Marseille Univ, CNRS, CINAM, Marseille, France.

Abstract

We used indirect nanoplasmonic sensing (INPS) coupled with mass spectrometry to study CO and oxygen adsorption as well as CO oxidation, on Pt nanoparticles, in the Torr pressure range. Due to an optimization of the physical parameters of our plasmonic sample, we obtain a highly sensitive probe that can detect gas adsorption of a few hundredths of a monolayer, even with a very low number density of Pt particles. Moreover and for the first time, a similarity is observed between the sign and the evolution of the localized surface plasmon resonance (LSPR) peak shift and the work function measurements for CO and oxygen chemisorption. Controlling the size, shape, and surface density of Pt particles, the turnover frequency (TOF) has also been accurately determined. For similar experimental conditions, the TOF is close to those measured on Pt/oxide powder catalysts and Pt(100) single crystals.