Effect of adding ZHS microcubes on ZnO nanorods for CO2 gas sensing applications

Juang, Feng-Renn; Chen, Bo-Yai

doi:10.1016/j.sse.2019.107711

Cited by 19 publications

(9 citation statements)

References 18 publications

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“…The ZnO nanorods with and without adding a catalyst ZnSn(OH) 6 (ZHS) microcubes have been synthesized on a p-type silicon substrate by a simple hydrothermal method and it is found that ZHS has a good ability to be used as a catalyst. In this report, ZHS microcubes can enhance the sensing performance of CO 2 by 35% in comparison to previously reported studies [104]. Ca-doped ZnO thin films coated Langasite (La 3 Ga 5 SiO 14 ) substrate have been prepared which shows good sensing performance towards CO 2 at high temperature by using a SAW sensor.…”

Section: Greenhosue Gas Sensorsmentioning

confidence: 54%

Nanostructured metal oxide semiconductor-based sensors for greenhouse gas detection: progress and challenges

Gautam¹,

Sharma²,

Tyagi³

et al. 2021

R. Soc. open sci.

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Climate change and global warming have been two massive concerns for the scientific community during the last few decades. Anthropogenic emissions of greenhouse gases (GHGs) have greatly amplified the level of greenhouse gases in the Earth's atmosphere which results in the gradual heating of the atmosphere. The precise measurement and reliable quantification of GHGs emission in the environment are of the utmost priority for the study of climate change. The detection of GHGs such as carbon dioxide, methane, nitrous oxide and ozone is the first and foremost step in finding the solution to manage and reduce the concentration of these gases in the Earth's atmosphere. The nanostructured metal oxide semiconductor (NMOS) based technologies for sensing GHGs emission have been found most reliable and accurate. Owing to their fascinating structural and morphological properties metal oxide semiconductors become an important class of materials for GHGs emission sensing technology. In this review article, the current concentration of GHGs in the Earth's environment, dominant sources of anthropogenic emissions of these gases and consequently their possible impacts on human life have been described briefly. Further, the different available technologies for GHG sensors along with their principle of operation have been largely discussed. The advantages and disadvantages of each sensor technology have also been highlighted. In particular, this article presents a comprehensive study on the development of various NMOS-based GHGs sensors and their performance analysis in order to establish a strong detection technology for the anthropogenic GHGs. In the last, the scope for improved sensitivity, selectivity and response time for these sensors, their future trends and outlook for researchers are suggested in the conclusion of this article.

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Section: Greenhosue Gas Sensorsmentioning

confidence: 54%

Nanostructured metal oxide semiconductor-based sensors for greenhouse gas detection: progress and challenges

Gautam¹,

Sharma²,

Tyagi³

et al. 2021

R. Soc. open sci.

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“…The difference in work functions of CNTs and ZnO is relatively small, and leads to the formation of Ohmic contacts between ZnO and CNTs. The electrons will transfer from the conduction band of ZnO to CNTs and holes will flow from CNTs to ZnO until this creates the in-built electric field between the n-ZnO/p-CNTs heterojunction [70,71]. When the CO 2 interacts with ZnO/CNTs surface, the field can be decreased owing to the easy flow of the charge carriers, which leads to a much higher sensing response [30,72].…”

Section: Gas-sensing Mechanismmentioning

confidence: 99%

“…When the CO 2 interacts with ZnO/CNTs surface, the field can be decreased owing to the easy flow of the charge carriers, which leads to a much higher sensing response [30,72]. The potential barrier between the n-ZnO/p-CNTs heterojunction is decreased under exposure to CO 2 gas, which offers an easy flow of the charge carriers and hence a higher sensing response [30,71,72].…”

Section: Gas-sensing Mechanismmentioning

confidence: 99%

Fabrication of ZnO/CNTs for Application in CO2 Sensor at Room Temperature

et al. 2021

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Thin films of ZnO and ZnO/carbon nanotubes (CNTs) are prepared and used as CO2 gas sensors. The spray pyrolysis method was used to prepare both ZnO and ZnO/CNTs films, with CNTs first prepared using the chemical vapor deposition method (CVD). The chemical structure and optical analyses for all the prepared nanomaterials were performed using X-ray diffraction (XRD), Fourier transformer infrared spectroscopy (FTIR), and UV/Vis spectrophotometer devices, respectively. According to the XRD analysis, the crystal sizes of ZnO and ZnO/CNTs were approximately 50.4 and 65.2 nm, respectively. CNTs have average inner and outer diameters of about 3 and 13 nm respectively, according to the transmitted electron microscope (TEM), and a wall thickness of about 5 nm. The detection of CO2 is accomplished by passing varying rates of the gas from 30 to 150 sccm over the prepared thin-film electrodes. At 150 sccm, the sensitivities of ZnO and ZnO/CNTs sensors are 6.8% and 22.4%, respectively. The ZnO/CNTs sensor has a very stable sensitivity to CO2 gas for 21 days. Moreover, this sensor has a high selectivity to CO2 in comparison with other gases, in which the ZnO/CNTs sensor has a higher sensitivity to CO2 compared to H2 and C2H2.

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“…Although the polycrystalline structure of this material has quite promising parameters in terms of use in gas sensors, pure ZnO has not represented high sensing performance. Introducing various dopants in this material results in high sensitivity, selectivity, and stability toward both oxidizing and reducing gases [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Gas Sensor Based on ZnO Nanostructured Film for the Detection of Ethanol Vapor

et al. 2022

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In this paper, the ZnO<La> target was synthesized by the solid-state reaction method and a nanostructured thin film was deposited by the RF (radio frequency) magnetron sputtering method on a Multi-Sensor-Platform. The obtained ZnO<La> nanostructured film was investigated as the sensing material. Energy-Dispersive X-ray (EDX) analysis indicated the existence of La in the synthesized ZnO<La> material. Scanning Electron Microscope (SEM) images of the film showed the grain sizes in the range of 20–40 nm. Sensor performance characteristics such as a dynamic response, response and recovery times, and ethanol detection range were investigated at 50–300 °C. A sensitivity was observed at extremely low concentrations of ethanol (0.7 ppm). The minimum response and recovery times of the sensor corresponding to 675 ppm ethanol vapor concentration at 250 °C were found to be 14 s and 61 s, respectively. The sensor showed a high response, good selectivity, fast response/recovery behavior, excellent repeatability toward ethanol vapor, and low sensitivity toward humidity. These characteristics enable the use of a ZnO<La> based sensor for ethanol detecting applications.

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Effect of adding ZHS microcubes on ZnO nanorods for CO2 gas sensing applications

Cited by 19 publications

References 18 publications

Nanostructured metal oxide semiconductor-based sensors for greenhouse gas detection: progress and challenges

Nanostructured metal oxide semiconductor-based sensors for greenhouse gas detection: progress and challenges

Fabrication of ZnO/CNTs for Application in CO2 Sensor at Room Temperature

Gas Sensor Based on ZnO Nanostructured Film for the Detection of Ethanol Vapor

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