Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Improving the CO and CH4 Gas Sensor Response at Room Temperature of α-Fe2O3(0001) Epitaxial Thin Films Grown on SrTiO3(111) Incorporating Au(111) Islands

Version 1 : Received: 21 June 2021 / Approved: 22 June 2021 / Online: 22 June 2021 (10:45:38 CEST)

A peer-reviewed article of this Preprint also exists.

Serrano, A.; López-Sánchez, J.; Arnay, I.; Cid, R.; Vila, M.; Salas-Cólera, E.; Castro, G.R.; Rubio-Zuazo, J. Improving the CO and CH4 Gas Sensor Response at Room Temperature of α-Fe2O3(0001) Epitaxial Thin Films Grown on SrTiO3(111) Incorporating Au(111) Islands. Coatings 2021, 11, 848. Serrano, A.; López-Sánchez, J.; Arnay, I.; Cid, R.; Vila, M.; Salas-Cólera, E.; Castro, G.R.; Rubio-Zuazo, J. Improving the CO and CH4 Gas Sensor Response at Room Temperature of α-Fe2O3(0001) Epitaxial Thin Films Grown on SrTiO3(111) Incorporating Au(111) Islands. Coatings 2021, 11, 848.

Journal reference: Coatings 2021, 11, 848
DOI: 10.3390/coatings11070848

Abstract

In this work epitaxial Au islands have been grown on epitaxial α-Fe2O3 thin film by pulsed laser deposition on SrTiO3(111) substrate. Both Au and α-Fe2O3 layer show an island-type growth with an average particle size of 40 and 62 nm, respectively. The crystallographic coupling of lattices is confirmed with a rotation of 30º between the in-plane crystallographic axes of α-Fe2O3(0001) structure and those of SrTiO3(111) substrate and between the in-plane crystallographic axes of Au(111) and those of α-Fe2O3(0001) structure. α-Fe2O3 is the only phase of iron oxide identified before and after its functionalization with Au nanoparticles. In addition, its structural character-istics are also preserved after Au deposition, with minor changes at short-range order. The func-tional character of the complex systems as gas sensor has been proven at room temperature. Con-ductance measurements of Au(111)/α-Fe2O3(0001)/ SrTiO3(111) system show that the incorpora-tion of Au islands on top of the α-Fe2O3(0001) layer induces an enhancement of the gas-sensing ac-tivity for CO and CH4 gas in comparison to a bare α-Fe2O3(0001) layer grown on SrTiO3(111).

Subject Areas

Au/α-Fe2O3 heterostructure; island-type growth; epitaxial growth; surface functionalization; gas sensor activity

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