The role of Ce doping in enhancing sensing performance of ZnO-based gas sensor by adjusting the proportion of oxygen species

Zhang, Yiqun; Liu, Yueying; Zhou, Linsheng; Liu, Deye; Liu, Fengmin; Liu, Fangmeng; Liang, Xishuang; Yan, Xu; Gao, Yuan

doi:10.1016/j.snb.2018.05.167

Cited by 163 publications

(46 citation statements)

References 38 publications

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“…The ZnO nanoparticles evolve into nanorods due to the (001) plane showing fast growth along this direction. Zhang et al [60] successfully regulated the proportion of ZnO surface oxygen species by Ce doping. Ce ions doped into the ZnO lattice, which can absorb oxygen ions forming saturated bonds and generating more oxygen vacancies in the lattice.…”

Section: Doping Of Rare Earth Elementmentioning

confidence: 99%

Advances in Doped ZnO Nanostructures for Gas Sensor

Wang

Gong

et al. 2020

The Chemical Record

131

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Gas sensors based on metal oxides semiconductor (MOS) have attracted extensive attention from both academic and industry. ZnO, as a typical MOS, exhibits potential applications in toxic gas detection, owning to its wide band gap, n-type transport characteristic and excellent electrical performance. Meanwhile, doping is an effective way to improve the sensing performance of ZnO materials. In this review, the effects of different types of doping on morphology, crystal structure, band gap and depletion layer of ZnO materials are comprehensively discussed. Theoretical analysis on the strategies for enhancing the sensing properties of ZnO is also provided. This review puts forward the reasonable insight for designing efficient n-type ZnO-based semiconductor oxide sensing materials.

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Section: Doping Of Rare Earth Elementmentioning

confidence: 99%

Advances in Doped ZnO Nanostructures for Gas Sensor

Wang

Gong

et al. 2020

The Chemical Record

131

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“…In this paragraph, ZnO, a typical n-type semiconductor, will be used as an example to illustrate the working mechanism of this approach. While exposed to air, zinc oxide could adsorb the oxygen molecules on its surface, and these adsorbed oxygen molecules could then trap free electrons from the conduction band of ZnO and consequently transform to O 2 − , O − , and O 2− by ionizing (as shown in Equations (1)–(4) [120,121,122]), which caused the formation of the depletion layer on the sensitive material’s surface, making the conductive channel narrow and the resistance increase. O 2 (gas)→O 2 (ads) O 2 (ads)+e — →O 2 — O 2 — +e — →2O — O — +e — →O 2 — 2CO+O 2 — →2CO 2 +e — CO+O — →CO 2 +e — CO+O 2 — →CO 2 +2e — …”

Section: Decorating With Noble Metal Nanoparticlesmentioning

confidence: 99%

“…When reduced gas is diffused, it will be oxidized by oxygen ions on the surface, so the captured electrons will be released into the conduction band of ZnO (as shown in Equations (5)–(7) [120,121,122]). As a result, the thickness of the electron depletion layer of ZnO becomes thinner, the concentration of free electrons in ZnO increases, and the resistance decreases [123,124,125].…”

Section: Decorating With Noble Metal Nanoparticlesmentioning

confidence: 99%

Approaches to Enhancing Gas Sensing Properties: A Review

Yuan

Meng

et al. 2019

Sensors

114

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A gas nanosensor is an instrument that converts the information of an unknown gas (species, concentration, etc.) into other signals (for example, an electrical signal) according to certain principles, combining detection principles, material science, and processing technology. As an effective application for detecting a large number of dangerous gases, gas nanosensors have attracted extensive interest. However, their development and application are restricted because of issues such as a low response, poor selectivity, and high operation temperature, etc. To tackle these issues, various measures have been studied and will be introduced in this review, mainly including controlling the nanostructure, doping with 2D nanomaterials, decorating with noble metal nanoparticles, and forming the heterojunction. In every section, recent advances and typical research, as well mechanisms, will also be demonstrated.

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“…It has reported that rare‐earth ions with f ‐orbitals act as efficient surface traps and absorb the electrons, which effectively alter the recombination rate of photogenerated carriers, then improve the photocatalytic performance. Among the lanthanide ions, the catalytic properties of cerium have received much attention due to the alteration of Ce oxidation state between Ce 3+ with 4 f 1 5 d 0 and Ce 4+ with 4 f 0 5 d 0 , which brings about excellent oxygen mobility . Furthermore, the change in the valence state of cerium ion (Ce 4+ to Ce 3+ ) is always along with the variation in the amount of oxygen vacancies (OVs) and adsorbed oxygen .…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Activity of Bi₂O₃ Enhanced by the Addition of Ce³⁺/Ce⁴⁺ Synthesized by Ethylene Glycol‐assisted Solvothermal Method

Quan

Shi

et al. 2020

ChemistrySelect

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The photocatalysts Bi 2 O 3 :Ce 3 + /Ce 4 + (cerium content 0.2, 0.5, 0.8, and 1.1 wt. %) were prepared via one-pot ethylene glycolassisted solvothermal method. The prepared x Ce-Bi 2 O 3 (x = 0.5, 0.8, 1.1) samples present δ-Bi 2 O 3 phase with space group of Fm-3 m at room temperature, which indicates that the hightemperature cubic phase could be stabilized via Ce doping in Bi 2 O 3 lattices. Moreover, the addition of Ce 3 + /Ce 4 + could change the amount of oxygen vacancies (OVs) and adsorbed oxygen on the surface of photocatalysts. The existence of oxygen vacancies and adsorbed oxygen facilitated the generation of superoxide radicals () and hydroxide radicals (), which were the dominant reactive oxygen species for phenol degradation. The photocatalyst containing 0.8 wt. % cerium presented the highest photoactivity than the other synthesized samples. A photodegradation mechanism is proposed based on scavenger and electron spin resonance studies.[a] T.

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The role of Ce doping in enhancing sensing performance of ZnO-based gas sensor by adjusting the proportion of oxygen species

Cited by 163 publications

References 38 publications

Advances in Doped ZnO Nanostructures for Gas Sensor

Advances in Doped ZnO Nanostructures for Gas Sensor

Approaches to Enhancing Gas Sensing Properties: A Review

Photocatalytic Activity of Bi₂O₃ Enhanced by the Addition of Ce³⁺/Ce⁴⁺ Synthesized by Ethylene Glycol‐assisted Solvothermal Method

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The role of Ce doping in enhancing sensing performance of ZnO-based gas sensor by adjusting the proportion of oxygen species

Cited by 163 publications

References 38 publications

Advances in Doped ZnO Nanostructures for Gas Sensor

Advances in Doped ZnO Nanostructures for Gas Sensor

Approaches to Enhancing Gas Sensing Properties: A Review

Photocatalytic Activity of Bi2O3 Enhanced by the Addition of Ce3+/Ce4+ Synthesized by Ethylene Glycol‐assisted Solvothermal Method

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Product

Resources

About

Photocatalytic Activity of Bi₂O₃ Enhanced by the Addition of Ce³⁺/Ce⁴⁺ Synthesized by Ethylene Glycol‐assisted Solvothermal Method