Sn–Ga co-doped ZnO nanobelts fabricated by thermal evaporation and application to ethanol gas sensors

Yu, Lihua; Liu, Sheng; Zhang, Nana; Wei, Jiansong; Lei, Ming; Fan, Xing

doi:10.1016/j.matlet.2014.11.049

Cited by 40 publications

(9 citation statements)

References 13 publications

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“…Gas sensors have been widely used in medicine industry and ecology to protect people from harmful gases [1]. Generally, gas-sensing mechanism is founded on the electron transport between adsorbed oxygen species and test gas molecules [2]. The response of sensor is not only determined by the amount of adsorbed oxygen species but also by the specific surface area, structure, active sites, and electron properties of sensing materials.…”

Section: Introductionmentioning

confidence: 99%

ZnO Nanorods for Gas Sensors

Wang¹

2020

Nanorods and Nanocomposites

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ZnO nanorods have been widely used to detect low-concentration gases due to its range of conductance variability, response toward both oxidative and reductive gases, and highly sensitive and selective properties. In this chapter, the fabrication methods of ZnO nanorods, their controllable growth, their different configurations, their modification for improving sensing property, and their composites for gas sensors are thoroughly introduced. The synthesis methods to fabricate ZnO nanorods consist of hydrothermal method, microemulsion synthesis, microwaveassisted hydrolysis preparation, gas-solution-solid method, spray pyrolysis, sonochemical route, simple solution route, and so on. The controllable fabrication of ZnO nanorods can be realized by control growth, selective growth, and diameter regulation. Different structures formed by ZnO nanorods include cross-linked configuration, flowerlike structure, and multishelled hollow spheres and hollow microsemispheres, as influence their sensing properties. ZnO nanorods can be modified by doping, functionalization, decoration, and sensitization for enhancing the sensing property. ZnO can be combined with graphene, carbon nanotubes, SnO 2 , In 2 O 3 , and Fe 2 O 3 to form core-shell composites for gas sensor.

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Section: Introductionmentioning

confidence: 99%

ZnO Nanorods for Gas Sensors

Wang¹

2020

Nanorods and Nanocomposites

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“…Doping by metal elements is a frequently applied strategy to modify ZnO nanomaterials for an enhanced gas sensing performance. , For example, Noel et al reported that 3%-Gd-modified ZnO fiberoptic sensor exhibited the best sensitivity for ethanol sensing. Xu et al synthesized an excellent acetone sensor based on La-doped ZnO nanofibers.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive and Selective Ethanol Sensor Fabricated with In-Doped 3DOM ZnO

Wang

Tian

Han

et al. 2016

ACS Appl. Mater. Interfaces

188

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ZnO is an important n-type semiconductor sensing material. Currently, much attention has been attracted to finding an effective method to prepare ZnO nanomaterials with high sensing sensitivity and excellent selectivity. A three-dimensionally ordered macroporous (3DOM) ZnO nanostructure with a large surface area is beneficial to gas and electron transfer, which can enhance the gas sensitivity of ZnO. Indium (In) doping is an effective way to improve the sensing properties of ZnO. In this paper, In-doped 3DOM ZnO with enhanced sensitivity and selectivity has been synthesized by using a colloidal crystal templating method. The 3DOM ZnO with 5 at. % of In-doping exhibits the highest sensitivity (∼88) to 100 ppm ethanol at 250 °C, which is approximately 3 times higher than that of pure 3DOM ZnO. The huge improvement to the sensitivity to ethanol was attributed to the increase in the surface area and the electron carrier concentration. The doping by In introduces more electrons into the matrix, which is helpful for increasing the amount of adsorbed oxygen, leading to high sensitivity. The In-doped 3DOM ZnO is a promising material for a new type of ethanol sensor.

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“…The HR‐TEM pattern also shows uniform and well dispersed nanostructures having size ∼80 nm. SAED pattern demonstrates polycrystalline nature and the crystal plane corresponding to different spots are (100), (002), (101), (102) and (110) in Figure 4 (c) [39,40] . The crystal plane corresponding to lattice fringe is (112) and interplanar spacing value (d) is 0.318 nm [Figure 4 (f)].…”

Section: Resultsmentioning

confidence: 99%

Enhanced Acetaldehyde Sensing Performance of Spherical Shaped Copper Doped ZnO Nanostructures

Rodrigues

Borge

Jain³

et al. 2023

ChemistrySelect

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Spherical shape copper (Cu) doped ZnO nanostructures of various amount (3, 6, 9 and 12 %) were synthesized. The XRD, FTIR, UV‐Visible, HR‐TEM, FESEM, EDS, SAED and XPS were done to understand the structural, optical, morphology and shape of Cu doped ZnO nanostructures. To achieve the best gas reaction, doping concentration was optimized. ZnO and Cu doped ZnO nanostructures were exposed to various oxygenated volatile organic compounds (OVOCs) and found to be more selective towards acetaldehyde sensing. For 50 ppm acetaldehyde gas, temperature study was done at various temperatures (RT, 50, 100, 150, 200 °C) which showed optimal at 100°C for maximal gas response. The response and recovery time was 16.53 and 18.36 seconds for 50 ppm of acetaldehyde gas. The gas sensing study was carried out at different humidity rates (11, 32, 51, 63 and 84 %) using different saturated solutions. 9 % Cu doped ZnO shows maximum response (61.53 %) as compared to pure ZnO and 3, 6 and 12 % Cu doped ZnO. The spherical shape Cu doped ZnO sensing response was increases with increase in concentration of gas from 10 to 300 ppm. Acetaldehyde gas shows enhanced selectivity towards spherical shape Cu doped ZnO sensors as compared to the other OVOCs like acetone, ethyl methyl ketone, methanol, ethanol, n‐propanol, n‐butanol, formaldehyde, acetaldehyde, propionaldehyde and acrolein. The reproducibility of Cu doped ZnO was studied for 50 days. Also, after acetaldehyde gas sensing change in morphology study of sensor was done.

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Sn–Ga co-doped ZnO nanobelts fabricated by thermal evaporation and application to ethanol gas sensors

Cited by 40 publications

References 13 publications

ZnO Nanorods for Gas Sensors

ZnO Nanorods for Gas Sensors

Highly Sensitive and Selective Ethanol Sensor Fabricated with In-Doped 3DOM ZnO

Enhanced Acetaldehyde Sensing Performance of Spherical Shaped Copper Doped ZnO Nanostructures

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