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Article

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

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Instituto de Cerámica y Vidrio (ICV), Consejo Superior de Investigaciones Científicas (CSIC), 28049 Madrid, Spain
2
Spanish CRG BM25 Beamline-SpLine at the European Synchrotron Radiation Facility (ESRF), 38000 Grenoble, France
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Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas (CSIC), 28049 Madrid, Spain
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Departamento de Física de Materiales, Universidad Complutense de Madrid, 28040 Madrid, Spain
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Centre for Cooperative Research on Alternative Energies (CIC energiGUNE), Basque Research and Technology Alliance (BRTA), Alava Technology Park, 01510 Vitoria-Gasteiz, Spain
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Escuela Técnica Superior de Ingeniería de Telecomunicación (ETSIT), Universidad Rey Juan Carlos, 28933 Madrid, Spain
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Departamento de Física, Universidad Carlos III de Madrid (UC3M), Leganés, 28911 Madrid, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Angela De Bonis
Coatings 2021, 11(7), 848; https://doi.org/10.3390/coatings11070848
Received: 18 June 2021 / Revised: 5 July 2021 / Accepted: 8 July 2021 / Published: 14 July 2021
(This article belongs to the Special Issue Advanced Ceramic Films and Coatings)
In this work, the functional character of complex α-Fe2O3(0001)/SrTiO3(111) and Au(111) islands/α-Fe2O3(0001)/SrTiO3(111) heterostructures has been proven as gas sensors at room temperature. Epitaxial Au islands and α-Fe2O3 thin film are grown by pulsed laser deposition on SrTiO3(111) substrates. Intrinsic parameters such as the composition, particle size and epitaxial character are investigated for their influence on the gas sensing response. Both Au and α-Fe2O3 layer show an island-type growth with an average particle size of 40 and 62 nm, respectively. The epitaxial and incommensurate growth is evidenced, confirming a rotation of 30° 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 characteristics are also preserved after Au deposition, with minor changes at short-range order. Conductance measurements of Au(111)/α-Fe2O3(0001)/SrTiO3(111) system show that the incorporation of epitaxial Au islands on top of the α-Fe2O3(0001) layer induces an enhancement of the gas-sensing activity of around 25% under CO and 35% under CH4 gas exposure, in comparison to a bare α-Fe2O3(0001) layer grown on SrTiO3(111) substrates. In addition, the response of the heterostructures to CO gas exposure is around 5–10% higher than to CH4 gas in each case. View Full-Text
Keywords: Au/α-Fe2O3 heterostructure; island-type growth; epitaxial growth; surface functionalization; gas sensor activity Au/α-Fe2O3 heterostructure; island-type growth; epitaxial growth; surface functionalization; gas sensor activity
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MDPI and ACS Style

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. https://doi.org/10.3390/coatings11070848

AMA Style

Serrano A, López-Sánchez J, Arnay I, Cid R, Vila M, Salas-Cólera E, Castro GR, 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(7):848. https://doi.org/10.3390/coatings11070848

Chicago/Turabian Style

Serrano, Aída, Jesús López-Sánchez, Iciar Arnay, Rosalía Cid, María Vila, Eduardo Salas-Cólera, Germán R. Castro, and Juan Rubio-Zuazo. 2021. "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 11, no. 7: 848. https://doi.org/10.3390/coatings11070848

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