Role of Au nanoparticles and NiTiO3 matrix in H2S sensing and its catalytic oxidation to SOx

Enrico Della Gaspera, Massimo Guglielmi, Giuseppe Giallongo, Stefano Agnoli, Gaetano Granozzi, Franco Quaglio, Alessandro Martucci

Research output: Contribution to journalArticlepeer-review

Abstract

The role of Au nanoparticles inside TiO2-NiO sol-gel thin films for hydrogen sulfide optical detection has been assessed by combining optical spectroscopy, X-ray diffraction (XRD), reaction products analysis and X-ray photoemission spectroscopy (XPS) data. Sulfur oxides (i.e., SO2 and SO3, hereafter SOx) are clearly distinguished as reaction products and SOx species are detected on the surface of the samples by XPS. After exposure to H2S, no metal sulfide species can be detected, neither by XRD nor XPS, so we propose that the reaction mechanism does not involve the formation of Ni, Ti or Au sulfides, but a direct catalytic oxidation of H2S to SOx. The role of Au is to provide an optical probe sensitive to the H2S presence, while the oxide matrix is responsible for the conversion of H2Sto SOx.

Original languageEnglish
Pages (from-to)591-594
Number of pages4
JournalSensor Letters
Volume9
Issue number2
DOIs
Publication statusPublished - Apr 2011

Keywords

  • Au nanoparticles
  • HS
  • Nanocomposite film
  • Optical sensor
  • Sol-Gel

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics

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