High-Temperature Hydrogen Sensing Performance of Ni-Doped TiO<sub>2</sub> Prepared by Co-Precipitation Method

High-Temperature Hydrogen Sensing Performance of Ni-Doped TiO<sub>2</sub> Prepared by Co-Precipitation Method

This work deals with the substantially high-temperature hydrogen sensors required by combustion and processing technologies. It reports the synthesis of undoped and Ni-doped TiO<sub>2</sub> (with 0, 0.5, 1 and 2 mol.% of Ni) nanoparticles by a co-precipitation method and the obtained cha...

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Main Authors: Roussin Lontio Fomekong, Klemens Kelm, Bilge Saruhan
Format: Article
Language:English
Published: MDPI AG 2020-10-01
Series:Sensors
Subjects:
high-temperature sensing
Ni-doped TiO<sub>2</sub>
hydrogen
gas sensor
co-precipitation
Online Access:https://www.mdpi.com/1424-8220/20/21/5992
id doaj-f4f70f74c22344e8bbb0c910c7f9a874
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spelling doaj-f4f70f74c22344e8bbb0c910c7f9a8742020-11-25T04:03:15ZengMDPI AGSensors1424-82202020-10-01205992599210.3390/s20215992High-Temperature Hydrogen Sensing Performance of Ni-Doped TiO<sub>2</sub> Prepared by Co-Precipitation MethodRoussin Lontio Fomekong0Klemens Kelm1Bilge Saruhan2Higher Teacher Training College, University of Yaounde I, Yaounde P.O. BOX 47, CameroonGerman Aerospace Center (DLR), Institute of Materials Research, 51147 Cologne, GermanyGerman Aerospace Center (DLR), Institute of Materials Research, 51147 Cologne, GermanyThis work deals with the substantially high-temperature hydrogen sensors required by combustion and processing technologies. It reports the synthesis of undoped and Ni-doped TiO<sub>2</sub> (with 0, 0.5, 1 and 2 mol.% of Ni) nanoparticles by a co-precipitation method and the obtained characteristics applicable for this purpose. The effect of nickel doping on the morphological variation, as well as on the phase transition from anatase to rutile, of TiO<sub>2</sub> was investigated by scanning electron microscopy, X-ray diffraction and Raman spectroscopy. The resistive sensors prepared with these powders were tested toward H<sub>2</sub> at 600 °C. The results indicate that 0.5% Ni-doped TiO<sub>2</sub> with almost equal amounts of anatase and rutile shows the best H<sub>2</sub> sensor response (ΔR/R0 = 72%), response rate and selectivity. The significant improvement of the sensing performance of 0.5% Ni-doped TiO<sub>2</sub> is mainly attributed to the formation of the highest number of n-n junctions present between anatase and rutile, which influence the quantity of adsorbed oxygen (i.e., the active reaction site) on the surface and the conductivity of the material.https://www.mdpi.com/1424-8220/20/21/5992high-temperature sensingNi-doped TiO<sub>2</sub>hydrogengas sensorco-precipitation
collection DOAJ
language English
format Article
sources DOAJ
author Roussin Lontio Fomekong
Klemens Kelm
Bilge Saruhan
spellingShingle Roussin Lontio Fomekong
Klemens Kelm
Bilge Saruhan
High-Temperature Hydrogen Sensing Performance of Ni-Doped TiO<sub>2</sub> Prepared by Co-Precipitation Method
Sensors
high-temperature sensing
Ni-doped TiO<sub>2</sub>
hydrogen
gas sensor
co-precipitation
author_facet Roussin Lontio Fomekong
Klemens Kelm
Bilge Saruhan
author_sort Roussin Lontio Fomekong
title High-Temperature Hydrogen Sensing Performance of Ni-Doped TiO<sub>2</sub> Prepared by Co-Precipitation Method
title_short High-Temperature Hydrogen Sensing Performance of Ni-Doped TiO<sub>2</sub> Prepared by Co-Precipitation Method
title_full High-Temperature Hydrogen Sensing Performance of Ni-Doped TiO<sub>2</sub> Prepared by Co-Precipitation Method
title_fullStr High-Temperature Hydrogen Sensing Performance of Ni-Doped TiO<sub>2</sub> Prepared by Co-Precipitation Method
title_full_unstemmed High-Temperature Hydrogen Sensing Performance of Ni-Doped TiO<sub>2</sub> Prepared by Co-Precipitation Method
title_sort high-temperature hydrogen sensing performance of ni-doped tio<sub>2</sub> prepared by co-precipitation method
publisher MDPI AG
series Sensors
issn 1424-8220
publishDate 2020-10-01
description This work deals with the substantially high-temperature hydrogen sensors required by combustion and processing technologies. It reports the synthesis of undoped and Ni-doped TiO<sub>2</sub> (with 0, 0.5, 1 and 2 mol.% of Ni) nanoparticles by a co-precipitation method and the obtained characteristics applicable for this purpose. The effect of nickel doping on the morphological variation, as well as on the phase transition from anatase to rutile, of TiO<sub>2</sub> was investigated by scanning electron microscopy, X-ray diffraction and Raman spectroscopy. The resistive sensors prepared with these powders were tested toward H<sub>2</sub> at 600 °C. The results indicate that 0.5% Ni-doped TiO<sub>2</sub> with almost equal amounts of anatase and rutile shows the best H<sub>2</sub> sensor response (ΔR/R0 = 72%), response rate and selectivity. The significant improvement of the sensing performance of 0.5% Ni-doped TiO<sub>2</sub> is mainly attributed to the formation of the highest number of n-n junctions present between anatase and rutile, which influence the quantity of adsorbed oxygen (i.e., the active reaction site) on the surface and the conductivity of the material.
topic high-temperature sensing
Ni-doped TiO<sub>2</sub>
hydrogen
gas sensor
co-precipitation
url https://www.mdpi.com/1424-8220/20/21/5992
work_keys_str_mv AT roussinlontiofomekong hightemperaturehydrogensensingperformanceofnidopedtiosub2subpreparedbycoprecipitationmethod
AT klemenskelm hightemperaturehydrogensensingperformanceofnidopedtiosub2subpreparedbycoprecipitationmethod
AT bilgesaruhan hightemperaturehydrogensensingperformanceofnidopedtiosub2subpreparedbycoprecipitationmethod
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