Nanostructured pure and Nb-doped TiO2 as thick film gas sensors for environmental monitoring

Carotta, M.C.; Ferroni, Matteo; Gnani, D.; Guidi, V.; Merli, M.; Martinelli, G.; Casale, Marco; Notaro, M.

doi:10.1016/s0925-4005(99)00148-3

Cited by 154 publications

(70 citation statements)

References 11 publications

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“…30 The electrical resistance change of the gas sensor based on FGO nanosheets with KBIP, MPP, and HFBA on the yarn ber to NH 3 exposure was approximately three times higher than that based on rGO nanosheets. The electrical resistance of FGO with KBIP increased by 70%, whereas rGO-based sensors exhibited an electrical resistance change of only 12% under exposure to 8 ppm NH 3 . In the case of NH 3 gas, the minimum concentration of 0.5 ppm and gas response with positive sensitivity were observed.…”

Section: Resultsmentioning

confidence: 98%

“…Gas sensors that provide information regarding the presence and concentration of specic gas molecules in the ambient atmosphere have been used for human health, 1 indoor and outdoor environmental monitoring, 2,3 and medical diagnostics. 4 Among various types of gas sensors, commercially available metal-oxide-based gas sensors have been investigated for several years owing to their relatively low cost and high sensitivity, but typical metal-oxide-based gas sensors require high operating temperatures of at least 200 C for effective interaction with the target gas.…”

Section: Introductionmentioning

confidence: 99%

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Highly sensitive and wearable gas sensors consisting of chemically functionalized graphene oxide assembled on cotton yarn

Kang

Kim

et al. 2018

RSC Adv.

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Highly sensitive and wearable chemical sensors for the detection of toxic gas molecules are given significant attention for a variety of applications in human health care and environmental safety. Herein, we demonstrated fiber-type gas sensors based on graphene oxide functionalized with organic molecules such as heptafluorobutylamine (HFBA), 1-(2-methoxyphenyl)piperazine (MPP), and 4-(2-keto-1-benzimidazolinyl)piperidine (KBIP) by assembling functionalized graphene oxide (FGO) on a single yarn fabric. These gas sensors of FGO on yarn exhibited extraordinarily higher sensitivity upon exposure to gas molecules than chemically reduced graphene oxide due to many active functional groups on the GO surface. Furthermore, the mechanical stability and chemical durability of the resulting gas sensors are well-maintained. Based on these results, we expected that our sensors with high sensitive and wearability will provide a good premise for wearable chemical sensors-based multidisciplinary applications.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Highly sensitive and wearable gas sensors consisting of chemically functionalized graphene oxide assembled on cotton yarn

Kang

Kim

et al. 2018

RSC Adv.

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“…e rutile is identi ed by the ICDD card no. 21-1276 according to the following crystal system: tetragonal space group: P4 2 /mmm − D e possible incorporation of Nb 5+ ions into the crystalline structure of TiO 2 [14][15][16] can be assumed, once the corresponding ionic radius of Ti 4+ and Nb 5+ can be identi ed as a source for the absence of niobium peaks in the corresponding curves. e insets of Figures 3(b)-3(d) con rm the absence of the rutile phase and the incorporation of Nb atoms into the TiO 2 structure.…”

Section: Microstructural Characterizationmentioning

confidence: 99%

Preparation, Characterization, and Evaluation of Humidity-Dependent Electrical Properties of Undoped and Niobium Oxide-Doped TiO₂ : WO₃ Mixed Powders

Faia

Libardi

Barbosa³

et al. 2017

Advances in Materials Science and Engineering

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e study of selective metal oxide-based binary/ternary systems has received increasing interest in recent years due to the possibility of producing e cient new ceramic materials for relative humidity (RH) detection, given the superior properties of the mixed compounds in comparison with pristine ones. e aim of this work was focused on preparation and characterization of non-doped and Nb 2 O 5 -doped TiO 2 : WO 3 pair (in the pellet form) and evaluation of corresponding humidity-dependent electrical properties. e microstructure of the samples was analyzed from scanning electron microscopy, X-ray di raction patterns, Raman spectra, BET surface area analysis, and porosimetry. e electrical characterization was obtained from impedance spectroscopy (100 Hz to 40 MHz) in the 10-100% RH range. e results showed that adequate doping levels of Nb 2 O 5 introduce important advantages due to the atomic substitution of Ti by Nb atoms in highly doped structures with di erent levels of porosity and grain sizes. ese aspects introduced a key role in the excursion (one order of magnitude) in the bulk resistance and grain boundary resistance, which characterizes these composite ceramics as a promising platform for RH identi cation.

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“…25 When niobium ions enter substitutionally into TiO 2 , the charge of the Nb 5ϩ ions should be compensated for a decrease in oxygen vacancies, leading to the hindering of the anatase-to-rutile transformation. 25,41 …”

Section: B Inhibition Of the Anatase-to-rutile Phase Transitionmentioning

confidence: 99%

Effects of Nb doping on the TiO2 anatase-to-rutile phase transition

Arbiol

Cerdá

Dezanneau

et al. 2002

Journal of Applied Physics

312

184

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We study the influence of Nb doping on the TiO 2 anatase-to-rutile phase transition, using combined transmission electron microscopy, Raman spectroscopy, x-ray diffraction and selected area electron diffraction analysis. This approach enabled anatase-to-rutile phase transition hindering to be clearly observed for low Nb-doped TiO 2 samples. Moreover, there was clear grain growth inhibition in the samples containing Nb. The use of high resolution transmission electron microscopy with our samples provides an innovative perspective compared with previous research on this issue. Our analysis shows that niobium is segregated from the anatase structure before and during the phase transformation, leading to the formation of NbO nanoclusters on the surface of the TiO 2 rutile nanoparticles.

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Nanostructured pure and Nb-doped TiO2 as thick film gas sensors for environmental monitoring

Cited by 154 publications

References 11 publications

Highly sensitive and wearable gas sensors consisting of chemically functionalized graphene oxide assembled on cotton yarn

Highly sensitive and wearable gas sensors consisting of chemically functionalized graphene oxide assembled on cotton yarn

Preparation, Characterization, and Evaluation of Humidity-Dependent Electrical Properties of Undoped and Niobium Oxide-Doped TiO₂ : WO₃ Mixed Powders

Effects of Nb doping on the TiO2 anatase-to-rutile phase transition

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Nanostructured pure and Nb-doped TiO2 as thick film gas sensors for environmental monitoring

Cited by 154 publications

References 11 publications

Highly sensitive and wearable gas sensors consisting of chemically functionalized graphene oxide assembled on cotton yarn

Highly sensitive and wearable gas sensors consisting of chemically functionalized graphene oxide assembled on cotton yarn

Preparation, Characterization, and Evaluation of Humidity-Dependent Electrical Properties of Undoped and Niobium Oxide-Doped TiO2 : WO3 Mixed Powders

Effects of Nb doping on the TiO2 anatase-to-rutile phase transition

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Preparation, Characterization, and Evaluation of Humidity-Dependent Electrical Properties of Undoped and Niobium Oxide-Doped TiO₂ : WO₃ Mixed Powders