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Effect of Ni, Pd, and Pt Nanoparticle Dispersion on Thick Films of TiO(2) Nanotubes for Hydrogen Sensing: TEM and XPS Studies

[Image: see text] Crystal structure, morphological features, and hydrogen-sensing properties of thick film sensors of TiO(2) nanotubes (NTs) impregnated with nanoparticles of elements of Group 10, viz., nickel, palladium, and platinum, having average grain size of about 25, 20, and 20 nm, respective...

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Autores principales: David, T. Manovah, Gnanasekar, K. I., Wilson, Paul, Sagayaraj, Pappu, Mathews, Tom
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2020
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7254529/
https://www.ncbi.nlm.nih.gov/pubmed/32478223
http://dx.doi.org/10.1021/acsomega.0c00292
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author David, T. Manovah
Gnanasekar, K. I.
Wilson, Paul
Sagayaraj, Pappu
Mathews, Tom
author_facet David, T. Manovah
Gnanasekar, K. I.
Wilson, Paul
Sagayaraj, Pappu
Mathews, Tom
author_sort David, T. Manovah
collection PubMed
description [Image: see text] Crystal structure, morphological features, and hydrogen-sensing properties of thick film sensors of TiO(2) nanotubes (NTs) impregnated with nanoparticles of elements of Group 10, viz., nickel, palladium, and platinum, having average grain size of about 25, 20, and 20 nm, respectively, are presented. The sensitivity is observed to be higher for Pd/TiO(2) NTs than for Pt/TiO(2) NTs. Ni/TiO(2) NTs exhibited very poor sensitivity. X-ray photoelectron spectroscopy (XPS) studies confirm reduction of the oxide layer of palladium nanoparticles, which, in turn, is responsible for the generation of Ti(3+) ion in TiO(2) NTs through hydrogen spillover. For Pt/TiO(2) NTs, only reduction of the oxide layer over Pt nanoparticles takes place without any spillover effect. For Ni/TiO(2) NTs, neither NiO nor TiO(2) undergoes any reduction. Changes in the Fermi level difference of PdO and TiO(2) along with Ti(3+) generation synergistically operate for Pd/TiO(2) NTs, whereas the difference in Fermi levels of PtO and TiO(2) alone operates for Pt/TiO(2) NTs during sensing.
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spelling pubmed-72545292020-05-29 Effect of Ni, Pd, and Pt Nanoparticle Dispersion on Thick Films of TiO(2) Nanotubes for Hydrogen Sensing: TEM and XPS Studies David, T. Manovah Gnanasekar, K. I. Wilson, Paul Sagayaraj, Pappu Mathews, Tom ACS Omega [Image: see text] Crystal structure, morphological features, and hydrogen-sensing properties of thick film sensors of TiO(2) nanotubes (NTs) impregnated with nanoparticles of elements of Group 10, viz., nickel, palladium, and platinum, having average grain size of about 25, 20, and 20 nm, respectively, are presented. The sensitivity is observed to be higher for Pd/TiO(2) NTs than for Pt/TiO(2) NTs. Ni/TiO(2) NTs exhibited very poor sensitivity. X-ray photoelectron spectroscopy (XPS) studies confirm reduction of the oxide layer of palladium nanoparticles, which, in turn, is responsible for the generation of Ti(3+) ion in TiO(2) NTs through hydrogen spillover. For Pt/TiO(2) NTs, only reduction of the oxide layer over Pt nanoparticles takes place without any spillover effect. For Ni/TiO(2) NTs, neither NiO nor TiO(2) undergoes any reduction. Changes in the Fermi level difference of PdO and TiO(2) along with Ti(3+) generation synergistically operate for Pd/TiO(2) NTs, whereas the difference in Fermi levels of PtO and TiO(2) alone operates for Pt/TiO(2) NTs during sensing. American Chemical Society 2020-05-13 /pmc/articles/PMC7254529/ /pubmed/32478223 http://dx.doi.org/10.1021/acsomega.0c00292 Text en Copyright © 2020 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
spellingShingle David, T. Manovah
Gnanasekar, K. I.
Wilson, Paul
Sagayaraj, Pappu
Mathews, Tom
Effect of Ni, Pd, and Pt Nanoparticle Dispersion on Thick Films of TiO(2) Nanotubes for Hydrogen Sensing: TEM and XPS Studies
title Effect of Ni, Pd, and Pt Nanoparticle Dispersion on Thick Films of TiO(2) Nanotubes for Hydrogen Sensing: TEM and XPS Studies
title_full Effect of Ni, Pd, and Pt Nanoparticle Dispersion on Thick Films of TiO(2) Nanotubes for Hydrogen Sensing: TEM and XPS Studies
title_fullStr Effect of Ni, Pd, and Pt Nanoparticle Dispersion on Thick Films of TiO(2) Nanotubes for Hydrogen Sensing: TEM and XPS Studies
title_full_unstemmed Effect of Ni, Pd, and Pt Nanoparticle Dispersion on Thick Films of TiO(2) Nanotubes for Hydrogen Sensing: TEM and XPS Studies
title_short Effect of Ni, Pd, and Pt Nanoparticle Dispersion on Thick Films of TiO(2) Nanotubes for Hydrogen Sensing: TEM and XPS Studies
title_sort effect of ni, pd, and pt nanoparticle dispersion on thick films of tio(2) nanotubes for hydrogen sensing: tem and xps studies
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7254529/
https://www.ncbi.nlm.nih.gov/pubmed/32478223
http://dx.doi.org/10.1021/acsomega.0c00292
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