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Xiao, Dingquan; Yu, Ping; Du, Ruoxin; Zhu, Jianguo; Shang-Qiang, Peng; Li, Ping; Zhuang, Yuli

doi:10.1023/a:1021889107847

Cited by 8 publications

(3 citation statements)

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“…1 Flow chart of the ceramic sensor fabricated in present research [3] (a) (b) [7]. It results in the alteration of TiO 2 conduction from n to p type.…”

Section: Cr 2 O 3 -Tio 2 /Cr Doped Tio 2 Powder Millingmentioning

confidence: 99%

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Electrical characterization of TiO2-based ceramics for VOCs

Wang

Xiao

et al. 2008

J Electroceram

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Cr doped TiO 2 and TiO 2 /Cr 2 O 3 powders are prepared by sol-gel technique and solid state reaction respectively. The structural and electronic properties of these powders are investigated. The responses of the materials made from the powders to benzene and formaldehyde vapors are studied. The research results show that Cr 3+ can enter into the lattice as substitutional metal dopant by sol gel route at lower temperature. The segregation of Cr 2 O 3 happens when Cr content exceed 8 at.%. The resistance of TiO 2 can be remarkable decreased by doping Cr 3+ as substitutional metal dopant. Besides Cr 3+ , the segregation of Cr 2 O 3 also contributes to the alteration of conduction from n-to p-type. With some other catalyzer, both of Cr doped TiO 2 -based and Cr 2 O 3 /TiO 2 -based ceramics can detect benzene and formaldehyde vapors at 21 ppm.

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“…1 Flow chart of the ceramic sensor fabricated in present research [3] (a) (b) [7]. It results in the alteration of TiO 2 conduction from n to p type.…”

Section: Cr 2 O 3 -Tio 2 /Cr Doped Tio 2 Powder Millingmentioning

confidence: 99%

“…The processing flow chart of the gas sensor is shown in Fig. 1 [3]. The materials were finally sintered in the air at 923 K. The structure of the sensor is given in Fig.…”

Section: Introductionmentioning

confidence: 99%

Electrical characterization of TiO2-based ceramics for VOCs

Wang

Xiao

et al. 2008

J Electroceram

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“…The semiconductor metal oxide gas sensors characterized by very good gas selectivity, high sensitivity, lower operating temperature, fast recovery time, cheap, easy miniaturization and the others, have been widely applied in various fields [1][2][3] . No matter what kind of sensor, it is inevitable to involve the adsorption of gas and the further exchange reactions on the gas-sensitive material surface [4] .…”

Section: Introductionmentioning

confidence: 99%

Influence of the Pore Structure on the Reaction Characteristics of the Gas Sensitive Porous Medium

Song

2011

AMR

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Taken the pore structure effects into account, a mathematical model to describe the interaction of mass transfers, the chemical reaction and the pore structure in the gas sensitive porous medium is presented and solved. The properties of the mass transfers and the reaction characteristics of the gas-sensitive porous system are analyzed. The effects of pore size distribution and porosity on the concentration field of detected gas and the effective utilization degree of the porous matrix are provided. The results indicate that the Thiele number, which can reflect the relative magnitude of chemical reaction rate and gas diffusion velocity in nature, is the main basis for judging the effects of various parameters. It usefully reproduces the observed effects of pore structure and reaction temperature on diffusion and chemical reaction response, showing that the gas sensitivity and the effective utilization coefficient of the gas sensitive porous medium can be controlled by adjusting key parameters.

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