Synthesis and acetone gas sensing properties of Ag activated hollow sphere structured ZnFe2O4

Zhang, Chao; Wu, Qingdan; Zheng, Baoyu; You, Jiajun; Luo, Yifan

doi:10.1016/j.ceramint.2018.08.064

Cited by 59 publications

(13 citation statements)

References 43 publications

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“…Operation at RT is the biggest challenge for sensors based on metal oxide semiconductors, and this had led to the development of ways to overcome this inconvenience. These approaches include doping [ 92 , 93 , 94 ], obtaining heterojunctions from p and n-type semiconductors [ 95 , 96 ], developing special microstructures [ 97 , 98 ], and inducing oxygen vacancies or the use of composite materials [ 86 , 99 , 100 ]. Among the most used and known methods of synthesis of doped materials are chemical vapor deposition, the hydrothermal method, the sol-gel method, and thermal annealing [ 101 ].…”

Section: Sensitive Materials Used In Gas Detectionmentioning

confidence: 99%

ZnO Metal Oxide Semiconductor in Surface Acoustic Wave Sensors: A Review

Constantinoiu

Viespe

2020

Sensors

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Surface acoustic wave (SAW) gas sensors are of continuous development interest to researchers due to their sensitivity, short detection time, and reliability. Among the most used materials to achieve the sensitive film of SAW sensors are metal oxide semiconductors, which are highlighted by thermal and chemical stability, by the presence on their surface of free electrons and also by the possibility of being used in different morphologies. For different types of gases, certain metal oxide semiconductors are used, and ZnO is an important representative for this category of materials in the field of sensors. Having a great potential for the development of SAW sensors, the discussion related to the development of the sensitivity of metal oxide semiconductors, especially ZnO, by the synthesis method or by obtaining new materials, is suitable and necessary to have an overview of the latest results in this domain.

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Section: Sensitive Materials Used In Gas Detectionmentioning

confidence: 99%

ZnO Metal Oxide Semiconductor in Surface Acoustic Wave Sensors: A Review

Constantinoiu

Viespe

2020

Sensors

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“…The operating temperature of the sensors was adjusted by means of the applied voltage. Further details of the testing system were shown in our previous works [17,30]. The target gas was collected in a poly(methyl methacrylate) (PMMA) chamber (volume: 50 L), the volume of which was calibrated using the following Equation 1:…”

Section: Fabrication and Sensing Test Of Gas Sensorsmentioning

confidence: 99%

“…However, Figure 3d, Figure 3h and Figure 3j show that when the rGO content exceeds 0.25 wt %, there are more ZnFe 2 O 4 spheres which are composed of small nanoparticles instead of nanosheets. This deformation of the self-assembled structure of the nanosheets may be ascribed to the introduction of more water to the organic solvent when increasing the volume of the aqueous GO dispersion [37,38] or to the low mass fraction of rGO in the ZnFe 2 O 4 /rGO composites [17,39].…”

Section: Samples Characterizationmentioning

confidence: 99%

“…However, the response decreases with the increase of the rGO content from 0.5 to 1 wt %, which may be explained as follows. The addition of a large amount of the aqueous dispersion of GO to the organic solvent, in which the reaction occurrs, affects the formation of the ZnFe 2 O 4 hollow spheres [17,39], resulting in a limitation of surface reactions. In addition, as shown in Figure 8b, the response of the sensors to 25-100 ppm acetone was also probed employing the same experimental conditions.…”

Section: Gas Sensing Performancementioning

confidence: 99%

“…Porous ZnFe 2 O 4 double-shell microspheres showed a response to acetone at 206 °C, which is mainly ascribed to their unique morphology [16]. Some researchers also found that Ag-activated hollow spheres of ZnFe 2 O 4 exhibited an excellent acetone gas-sensing performance at 175 °C [17]. Moreover, ZnFe 2 O 4 /ZnO composites showed an excellent response and recovery performance, which was attributed to their nanostructure and synergistic effects in the heterostructures.…”

Section: Introductionmentioning

confidence: 95%

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Synthesis and acetone sensing properties of ZnFe₂O₄/rGO gas sensors

Wu¹,

Luo²,

Liu³

et al. 2019

Beilstein J. Nanotechnol.

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Hollow spheres of pure ZnFe2O4 and of composites of ZnFe2O4 and reduced graphene oxide (rGO) with different rGO content were prepared via a simple solvothermal method followed by a high-temperature annealing process in an inert atmosphere. The X-ray diffraction analysis confirmed that the introduction of rGO had no effect on the spinel structure of ZnFe2O4. In addition, the results of field-emission scanning electron microscopy and (high-resolution) transmission electron microscopy indicated that the synthesized samples had the structure of hollow spheres distributed uniformly onto rGO nanosheets. The diameters of the spheres were determined as about 600–1000 nm. The gas sensing test revealed that the introduction of rGO improved the performance of the sensing of acetone to low concentration, and the ZnFe2O4/rGO composite gas sensor containing 0.5 wt % of rGO exhibited a high sensitivity in sensing test using 0.8–100 ppm acetone at 200 °C. The response of the 0.5 wt % ZnFe2O4/rGO sensor to 0.8 ppm acetone was 1.50, and its response to 10 ppm acetone was 8.18, which is around 2.6 times more pronounced than the response of pure ZnFe2O4 (10 ppm, 3.20). Moreover, the sensor showed a wide linear range and good selectivity.

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Chemiresistive Gas Sensors Based on Hollow Heterojunction: A Review

Liu

Xiao

2021

Adv Materials Inter

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Chemiresistive gas sensors are widely used in tens of thousands of applications, from health and safety to energy efficiency and emission control. Fabrication of highly effective sensing materials is of great significance for the practical applications in efficient gas detection. Among numerous sensing materials, semiconductor‐based sensing materials with hollow and heterojunction structures demonstrate distinct advantages such as high sensitivity, low operating temperature, and fast response/recovery. In this paper, the mechanism of gas sensing by chemiresistive sensors, as well as the mechanisms responsible for enhanced sensing performance in hollow structure and heterojunction are reviewed. Both single‐shelled and multi‐shelled hollow heterojunction materials applied in gas detection are presented. Then, the design and application of open hollow heterojunction in gas sensing are discussed. This review provides a deeper understanding of innovative works on the material design of high‐performance sensing materials for gas detection. It also summarizes the key technical challenges in material development and points out the perspectives for future studies on the next generating of chemiresistive gas sensing materials.

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Synthesis and acetone gas sensing properties of Ag activated hollow sphere structured ZnFe2O4

Cited by 59 publications

References 43 publications

ZnO Metal Oxide Semiconductor in Surface Acoustic Wave Sensors: A Review

ZnO Metal Oxide Semiconductor in Surface Acoustic Wave Sensors: A Review

Synthesis and acetone sensing properties of ZnFe₂O₄/rGO gas sensors

Chemiresistive Gas Sensors Based on Hollow Heterojunction: A Review

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Synthesis and acetone gas sensing properties of Ag activated hollow sphere structured ZnFe2O4

Cited by 59 publications

References 43 publications

ZnO Metal Oxide Semiconductor in Surface Acoustic Wave Sensors: A Review

ZnO Metal Oxide Semiconductor in Surface Acoustic Wave Sensors: A Review

Synthesis and acetone sensing properties of ZnFe2O4/rGO gas sensors

Chemiresistive Gas Sensors Based on Hollow Heterojunction: A Review

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Synthesis and acetone sensing properties of ZnFe₂O₄/rGO gas sensors