Enhanced CO 2 gas-sensing performance of ZnO nanopowder by La loaded during simple hydrothermal method

Jeong, Yun Jin; Balamurugan, C.; Lee, D.-W.

doi:10.1016/j.snb.2015.11.093

Cited by 101 publications

(40 citation statements)

References 34 publications

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“…For n-type semiconductor materials, CO 2 gas molecules also react with adsorbed oxygen ions and returns excess electrons to material. These reactions causes decreased sensor’s resistance while loading of CO 2 gas 42 . Due to increasing activation energy of CH 4 , H 2 S and CO 2 gases in comparison to H 2 , maximum sensor response is observed for hydrogen at even ppm level with maximum change in depletion region.…”

Section: Discussionmentioning

confidence: 99%

Pd/ZnO nanorods based sensor for highly selective detection of extremely low concentration hydrogen

Kumar

Bhati

Ranwa

et al. 2017

Sci Rep

110

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We report highly hydrogen selective Pd contacted ZnO nanorods based sensor detecting low concentration even at low operating temperature of 50 °C. The sensor performance was investigated for various gases such as H2, CH4, H2S and CO2 at different operating temperatures from 50 °C to 175 °C for various gas concentrations ranging from 7 ppm to 10,000 ppm (1%). The sensor is highly efficient as it detects hydrogen even at low concentration of ~7 ppm and at operating temperature of 50 °C. The sensor’s minimum limit of detection and relative response at 175 °C were found 7 ppm with ~38.7% for H2, 110 ppm with ~6.08% for CH4, 500 ppm with ~10.06% for H2S and 1% with ~11.87% for CO2. Here, Pd exhibits dual characteristics as metal contact and excellent catalyst to hydrogen molecules. The activation energy was calculated for all the gases and found lowest ~3.658 kJ/mol for H2. Low activation energy accelerates desorption reactions and enhances the sensor’s performance.

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Section: Discussionmentioning

confidence: 99%

Pd/ZnO nanorods based sensor for highly selective detection of extremely low concentration hydrogen

Kumar

Bhati

Ranwa

et al. 2017

Sci Rep

110

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“…However, the response decreased by further increasing the La concentration. Similarly, Jeong et al show 50% La loaded ZnO nano-powder as a suitable CO2 gas sensor operated at 400°C [90] . Table 3 presents comparison of various SMO-based gas sensors operated at high temperature.…”

Section: Role Of Dopants and Catalyst On Sensing Operated At High Temmentioning

confidence: 95%

High‐Temperature Gas Sensors for Harsh Environment Applications: A Review

Ghosh

Zhang

Hai-feng

2019

CLEAN Soil Air Water

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This review paper introduces various types of gas sensors operating at high temperatures and their mechanisms, which can provide solutions to gas sensor selection for harsh environment application. Most of the gas sensors are found to be functioning at moderate operating temperatures (<400°C) and only a few reports are available, which highlight gas-sensing performance above 400°C. Therefore, the selection of a more reliable high-temperature gas sensor is necessary and advantageous for applications in areas such as agricultural waste processes (such as pyrolysis processes), military facilities, nuclear power plants, and automobile industries. In this paper, three major parts have been conducted to address the importance of high-temperature gas sensors and provide strategical solution for gas sensor selection. First, we have highlighted the application scenario and the sensing mechanism of various gas sensors operating at high temperature. Additionally, factors that affect sensing performance at moderate operating temperature have been investigated. Secondly, we have discussed the effect of material compositions, morphology of the nanostructures, and the use of dopants on sensing performance of high temperature gas sensors. Meanwhile, the catalytic nature of the sensing layer and temperature effect on chemisorption in oxide-based sensors have been discussed meticulously. Lastly, future challenges including factors affecting various sensor performance, selection, and preparation of sensing materials operating at higher temperatures are explored systematically.

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“…Oxygen adsorption and desorption reach an equilibrium state, consequently, the depletion layer is formed and this process causes a higher resistance. When ZnO nanostructures are exposed to an oxidizing gas such as NO, gas molecules capture the electrons on the sensing surface, as shown in the following reaction [19]:…”

Section: Resultsmentioning

confidence: 99%

“…The NO reacts with the surface-adsorbed active oxygen species and is oxidized in the sensing reaction (the surface is reduced) [18,19]. Thus, the concentration of holes increases, increasing the depletion-layer widths in the adjacent grains and decreasing the conducting-channel widths as a result of this resistance increases.…”

Section: Resultsmentioning

confidence: 99%

Low-level NO gas sensing properties of $$\hbox {Zn}_{1-x}\hbox {Sn}_{x}\hbox {O}$$ Zn 1 - x Sn x

Çağırtekin

Çorlu

et al. 2019

Bull Mater Sci

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Zn 1−x Sn x O (x = 0, 0.05, 0.10, 0.15, 0.20) nanostructures have been grown through the successive ionic layer adsorption and reaction method. The structural, morphological and compositional properties of the nanostructures have been characterized through X-ray diffraction, scanning electron microscope and energy dispersive X-ray analysis, respectively. The NO gas sensing properties of sensors to 20 ppb have been systematically investigated in the dark and under UV light irradiation. A Zn 0.90 Sn 0.10 O sensor has exhibited the highest response for 20 ppb NO gas compared with other sensors. The sensor response has increased from 1.9 to 43% depending on the UV light irradiation for the Zn 0.90 Sn 0.10 O sensor. Zn 0.90 Sn 0.10 O nanostructure can be used as a suitable gas sensor material for detection of low concentration levels of NO gas.

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Enhanced CO 2 gas-sensing performance of ZnO nanopowder by La loaded during simple hydrothermal method

Cited by 101 publications

References 34 publications

Pd/ZnO nanorods based sensor for highly selective detection of extremely low concentration hydrogen

Pd/ZnO nanorods based sensor for highly selective detection of extremely low concentration hydrogen

High‐Temperature Gas Sensors for Harsh Environment Applications: A Review

Low-level NO gas sensing properties of $$\hbox {Zn}_{1-x}\hbox {Sn}_{x}\hbox {O}$$ Zn 1 - x Sn x

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