Preparation and gas sensing activity of La and Y co-doped titania nanoparticles

Ling, Baoping; Yu, Yang; Qi, Wei; Zhang, Shufang

doi:10.1007/s10971-014-3501-7

Cited by 12 publications

(3 citation statements)

References 19 publications

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“…TiO 2 in nature has three crystal structures, known as brookite, anatase, and rutile; rutile, and anatase are most widely used as a gas sensor. Rutile is more stable at high temperature while anatase has better gas sensitivity due its eminent gas reaction capability (Comini et al, 2005;Li et al, 2009;Jing et al, 2015). Currently, the TiO 2 -coatings based on physical vapor deposition (e.g., sputtering) are mainly for high temperature gas sensing, which is carried out under high vacuum, thus increasing the cost of the final device.…”

Section: Introductionmentioning

confidence: 99%

Sol-gel Synthesis of TiO2 With p-Type Response to Hydrogen Gas at Elevated Temperature

Xie

Sun

et al. 2019

Front. Mater.

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Titanium dioxide is considered as one of the potential candidates for high-temperature gas sensing applications due to its excellent sensitivity and stability. However, its practical use as a gas sensor under elevated conditions is limited on account of its selectivity and insufficient understanding of response conversion from n-to p-type. To this context, the present work is intended to prepare and understand the p-type response of anatase TiO 2 toward H 2 gas (20-1,000 ppm) at elevated temperature (500 • C). Sol-gel route is adopted to facilely synthesize powders containing pure and chromium (1-10 at.%) doped TiO 2 nanoparticles, which are then brushed onto substrates with already patterned inter-digitated platinum electrodes. In this work, even, the undoped TiO 2 samples showed p-type gas sensing response, which then decreased with Cr doping. However, in comparison to previously reported work, the sensing characteristics of all sensors is improved. For instance, 5 at.% Cr-TiO 2 showed high response (147), fast response and recovery (142/123s) time, and good selectivity to hydrogen against monoxide and methane. Despite better response values, the TiO 2 based samples show instability and drift in baseline resistance; such issues were not observed for Cr-doped TiO 2 samples (≥3 at.%). The powders were further analyzed by XRD, SEM, TEM, and XPS to understand the basic characteristics, p-type response and stability. Further, a plausible sensing mechanism is discussed on basis of results obtained from aforementioned techniques.

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Section: Introductionmentioning

confidence: 99%

Sol-gel Synthesis of TiO2 With p-Type Response to Hydrogen Gas at Elevated Temperature

Xie

Sun

et al. 2019

Front. Mater.

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“…Among these, anatase TiO x (A-TiO x ) and rutile TiO x (R-TiO x ) are the most widely used in gas sensors. R-TiO x is more stable at high temperatures, whereas A-TiO x , due to its excellent gas response, has emerged as a more promising candidate for gas sensors. − However, titanium oxide typically requires metal doping to enhance its electrical performance. Li et al explored the impact of Cr doping on the gas sensing characteristics of TiO 2 NPs, whereas Kayani et al demonstrated significant improvements in the optical and electrical properties of Mg-doped TiO 2 by altering the band gap.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Room Temperature NO₂ Sensor Using Two-Phase TiO_x Heterogeneous Nanoparticles

Huang,

Sivakumar,

et al. 2024

ACS Appl. Mater. Interfaces

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In this study, we successfully synthesized two-phase titanium oxide (TiO x ) heterogeneous nanoparticles (NPs) using an advanced sol–gel method, a significant stride in developing efficient, room temperature (RT) NO2 gas sensors. The prepared two-phase TiO x heterogeneous NPs exhibited exceptional sensitivity to low concentrations of NO2 gas at RT. The heightened gas response was attributed to a significant presence of oxygen vacancies, creating intermediate states within the two-phase heterostructures and thus narrowing the band gap. This facilitated electron transport from the valence band (VB) to the conduction band (CB), resulting in increased current at RT. The XPS analysis confirmed a substantial amount of chemisorbed oxygen O2(ads) – within the two-phase heterostructures, providing more chemisorption sites for nitrogen dioxide gas. This increase in chemisorption sites significantly improved the gas response. Furthermore, the introduction of zinc into the TiO x NPs reduced their band gap, enhancing the background resistance signal-to-noise ratio and increasing the response while maintaining remarkable stability. In summary, our work introduces a promising RT NO2 sensor based on two-phase TiO x heterogeneous NPs, holding great potential for applications in environmental monitoring and gas sensing technology. In future work, we aim to delve deeper into the capabilities of the sensor, exploring broader applications and refining its design for enhanced practicality in environmental monitoring.

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“…The study of doped semiconductor oxides has grown in the past years due to their many potential technological applications in current highly relevant topics, such as spintronics [1,2], gas sensors [3][4][5][6][7], photocatalysis [8,9] or fuel cells for renewable energies [10]. In this sense, the characterization and modelling of properties related to the inclusion of impurities in an oxide nowadays are of an important and increasing interest.…”

Section: Introductionmentioning

confidence: 99%

Substitutional Ta-doping in Y₂O₃ semiconductor by sol-gel synthesis: experimental and theoretical studies

Richard

Rentería

Carbonari

2017

Semicond. Sci. Technol.

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The Pechini sol-gel method has been employed for the synthesis of pure and ( 181 Hf→) 181 Ta-doped Y 2 O 3 nanopowders. We performed a structural characterization from the micro to the subnanoscopic scale by means of scanning electron microscopy, energy dispersive x-ray spectroscopy, x-ray diffraction, and time-differential perturbed γ-γ angular correlation (PAC) spectroscopy. The results show the formation of the cubic bixbyite structure after a thermal treatment at 1473 K. For the synthesized 181 Ta-doped Y 2 O 3 , the PAC experiments demonstrate that the impurities are mainly located at both substitutional cationic sites of the bixbyite structure. The experimental investigation was complemented by performing firstprinciples electronic structure calculations for Ta atoms localized at the two cationic sites of the Y 2 O 3 semiconductor structure, which allow the study of the structural and electronic modifications induced in the host system when the impurities are introduced. These calculations confirm that the measured electric-field gradients for the synthesized 181 Ta-doped Y 2 O 3 correspond to double-ionized impurities located at substitutional defect-free cationic sites of the bixbyite host structure and indicate the site occupancy preference for 181 Hf(→ 181 Ta) doping. The behaviour of the site preference of 181 Ta impurities with temperature is also discussed. In addition to an extensive structural and electronic characterization of pure and Ta-doped Y 2 O 3 semiconductor, our results demonstrate that the Pechini sol-gel process is an affordable and effective way to successfully synthesize these PAC substitutional doped samples.

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Preparation and gas sensing activity of La and Y co-doped titania nanoparticles

Cited by 12 publications

References 19 publications

Sol-gel Synthesis of TiO2 With p-Type Response to Hydrogen Gas at Elevated Temperature

Sol-gel Synthesis of TiO2 With p-Type Response to Hydrogen Gas at Elevated Temperature

Highly Efficient Room Temperature NO₂ Sensor Using Two-Phase TiO_x Heterogeneous Nanoparticles

Substitutional Ta-doping in Y₂O₃ semiconductor by sol-gel synthesis: experimental and theoretical studies

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Preparation and gas sensing activity of La and Y co-doped titania nanoparticles

Cited by 12 publications

References 19 publications

Sol-gel Synthesis of TiO2 With p-Type Response to Hydrogen Gas at Elevated Temperature

Sol-gel Synthesis of TiO2 With p-Type Response to Hydrogen Gas at Elevated Temperature

Highly Efficient Room Temperature NO2 Sensor Using Two-Phase TiOx Heterogeneous Nanoparticles

Substitutional Ta-doping in Y2O3 semiconductor by sol-gel synthesis: experimental and theoretical studies

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Highly Efficient Room Temperature NO₂ Sensor Using Two-Phase TiO_x Heterogeneous Nanoparticles

Substitutional Ta-doping in Y₂O₃ semiconductor by sol-gel synthesis: experimental and theoretical studies