Humidity sensing enhancement and structural evolution of tungsten doped ZnO nanosensors fabricated through co-precipitation synthesis

Verma, Vernica; Pandey, Narendra Kumar; Gupta, Priya; Singh, Kuldeep; Singh, Peramjeet

doi:10.1016/j.physb.2021.413224

Cited by 20 publications

(8 citation statements)

References 42 publications

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“…The sensor response time toward CO 2 is an important parameter for approximating material performance, as it determines the delay to reach the exact gas concentration value and the time required to prepare the sensor for the subsequent measurement. 49 The response time (t res ) is defined as the time taken for the relative resistance change to reach 90% of the steady 50,51 state value after CO 2 injection, while the recovery time is for the delay required to reduce the difference between highest and lowest resistance. The YCeO sensor manifested decent response at 30 °C and exhibited almost a linear increase with CO 2 concentrations as shown in Fig.…”

Section: Co 2 Sensing Analysismentioning

confidence: 99%

Fabrication of Highly Sensitive YCeO Chemo-resistive Gas Sensor for Selective Detection of CO₂

Srivastava,

Pandey,

Verma

et al. 2024

ECS Sens. Plus

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A room-temperature-operated CO2 gas sensor based on YCeO nanocomposite was effectively prepared by the simple hydrothermal technique to detect low traces of CO2 (50-250 ppm). The YCeO granular morphological features were observed using field-emission scanning electron microscopy, which confirmed successful fabrication of nanocomposite of Y2O3 and CeO2. X-ray diffraction of YCeO showed the Cubic structure of space group Fm3m having density 6.74 gmcm-3. Rietveld refinement was performed for the analysis of complete crystal structural property. Surface porosity and specific surface area were observed by Brunnauer-Emmet Teller analysis. Optical properties were observed using UV-Visible spectroscopy. The band gap, optical conductivity, and refractive index calculated were 3.44 eV, 2.63×106, and 0.1164, respectively. Fourier transform infrared spectroscopy was done to analyze the functional and elastic properties of as-prepared nanomaterial. The highest sensor response recorded was 2.14. The response and recovery time at 50 ppm observed were 75.6 and 107.3 s, respectively. The YCeO chemo-resistive sensor confirmed long-term stability and selectivity to CO2 as compared to other gases viz. LPG, NH3, CH4, H2S, NO2 and H2. The relative humidity exposure was also performed at 15, 55 and 95% RH, in which it was confirmed that the sensor would give best response at mid humidity level i.e. 55 %RH. Sensing characteristics curve of YCeO nanocomposite at different temperature (30-90°C) at 50 ppm confirmed that YCeO sensor performed excellent at room temperature. This report unlocks an innovative opening for the fabrication of sensing devices that are room-temperature-operatable, highly-sensitive and selective for quick detection of CO2 gas for its commercialization

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Section: Co 2 Sensing Analysismentioning

confidence: 99%

Fabrication of Highly Sensitive YCeO Chemo-resistive Gas Sensor for Selective Detection of CO₂

Srivastava,

Pandey,

Verma

et al. 2024

ECS Sens. Plus

Self Cite

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“…The energy density (u) of a real nanocrystal is not isotropic. In this case, the ratio between stress and strain is non-linear [74,75]. Therefore, it is more appropriate to use the Williamson-Hall (W-H) method to determine strain [76][77][78].…”

Section: Structural Analysismentioning

confidence: 99%

“…The humidity sensing mechanism responsible for the change in resistance depending on RH% is a process that includes chemical adsorption (chemisorption), physical adsorption (physisorption) and capillary condensation, and the Zn 2+ ions on the material surface and the morphology of the humidity-sensing metal oxide material are the critical parameters of this process [37,75,91,92]. According to figure 8, the resistances of BZO humidity sensors change quite rapidly at low relative humidity.…”

Section: Humidity Sensing Measurementsmentioning

confidence: 99%

“…The interaction of water molecules with the sensor surface results in the release of free electrons and this leads to the decrease in resistance. Metal cations and hydroxyl ions of dissociated water molecules form covalent bonds and cause the emergence of mobile protons [75]. In this case, conduction occurs by the movement of these mobile protons from site to site via the Von Grotthuss mechanism (proton hopping mechanism) across the surface in this first chemically absorbed layer.…”

Section: Humidity Sensing Measurementsmentioning

confidence: 99%

“…Grain size and crystallinity quality stand out as factors that have a remarkable impact on the humidity sensitivity of humidity sensors [96]. High crystallinity quality and/or smaller particle size have an increasing effect on humidity sensitivity [75]. It was determined from XRD analysis that the structure with the highest crystallinity quality was BZO10.…”

Section: Humidity Sensing Measurementsmentioning

confidence: 99%

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Improved humidity sensing performances of boron doped ZnO nanostructured thin films depending on boron concentration

Algün,

Alshater,

Akçay

2024

Phys. Scr.

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This study details the production and analysis of undoped zinc oxide (uZnO) and boron (B) doped zinc oxide nanostructured thin films, with a specific focus on assessing the influence of varying B doping concentrations on humidity sensing performance. The synthesis of undoped ZnO and B doped ZnO nanoparticles was carried out using sol-gel method. B doping concentrations within the ZnO lattice were adjusted to 1, 3, 4, 5, and 10 mol%. Subsequently, nanostructured thin films were obtained through the spin coating technique on glass substrates. X-ray diffraction analysis revealed a hexagonal wurtzite structure for all nanostructured thin films. Notably, a change in preferential orientation from the (002) plane to the (100) plane occurred when B doping concentration exceeded 5 mol%. Scanning electron microscopy showcased nano-sized grains and capillary nanopores on the surface of each thin film. Energy dispersive X-ray spectra confirmed the presence of zinc, oxygen, and boron elements in the nanostructured thin films. Humidity sensing performance was assessed through electrical resistance measurements in the range of 45–90% relative humidity at room temperature. All fabricated sensors exhibited sensitivity to humidity. Remarkably, the sensor with a 5 mol% B doping concentration demonstrated the highest humidity sensitivity (438.44 times) and the fastest response (2.0 s) and recovery times (14.2 s). The study concluded that the optimal B doping concentration for designing a highly efficient humidity sensor was determined to be 5 mol%. Overall, the study underscores the potential of B doped ZnO nanostructures for humidity sensor applications, given their exceptional sensor performance.

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Efficient Fabrication of CrFeO₃‐Based Humidity Sensing Device with Fast Dynamics for Real‐Time Breath Monitoring and Contact‐Less Sensing

Dhariwal,

Yadav,

Kumari

et al. 2024

Part & Part Syst Charact

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In this study, a simple and cost‐effective method is presented for developing a metal oxide‐based humidity sensor. CrFeO3 is synthesized without any precipitating agent and chosen as a model material to study the validity of humidity sensing properties. The surface morphology and structural analysis are provided using field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), X‐ray diffraction (XRD), and Brunauer–Emmett–Teller (BET) analysis. Elemental analysis is provided with the help of X‐ray photoelectron spectroscopy (XPS). Obtained results demonstrate the tunable response of order 860 and stability in a large range of humidity. Also, by controlling the porosity and film uniformity, a fast response time of 1.6 s and a recovery time of 2.6 s are achieved with very low hysteresis. Also, cole–cole plot and Fourier transform infrared spectroscopy (FTIR) spectra in the presence and absence of humidity provide detailed analysis of surface interaction with H2O molecules. In addition to this, the developed sensor demonstrates excellent response and reproducibility toward real‐time human respiration monitoring along with non‐contact sensing. This work enables the study of developed sensors in real‐time humidity monitoring for practical applications.

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Humidity sensing enhancement and structural evolution of tungsten doped ZnO nanosensors fabricated through co-precipitation synthesis

Cited by 20 publications

References 42 publications

Fabrication of Highly Sensitive YCeO Chemo-resistive Gas Sensor for Selective Detection of CO₂

Fabrication of Highly Sensitive YCeO Chemo-resistive Gas Sensor for Selective Detection of CO₂

Improved humidity sensing performances of boron doped ZnO nanostructured thin films depending on boron concentration

Efficient Fabrication of CrFeO₃‐Based Humidity Sensing Device with Fast Dynamics for Real‐Time Breath Monitoring and Contact‐Less Sensing

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Humidity sensing enhancement and structural evolution of tungsten doped ZnO nanosensors fabricated through co-precipitation synthesis

Cited by 20 publications

References 42 publications

Fabrication of Highly Sensitive YCeO Chemo-resistive Gas Sensor for Selective Detection of CO2

Fabrication of Highly Sensitive YCeO Chemo-resistive Gas Sensor for Selective Detection of CO2

Improved humidity sensing performances of boron doped ZnO nanostructured thin films depending on boron concentration

Efficient Fabrication of CrFeO3‐Based Humidity Sensing Device with Fast Dynamics for Real‐Time Breath Monitoring and Contact‐Less Sensing

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Product

Resources

About

Fabrication of Highly Sensitive YCeO Chemo-resistive Gas Sensor for Selective Detection of CO₂

Fabrication of Highly Sensitive YCeO Chemo-resistive Gas Sensor for Selective Detection of CO₂

Efficient Fabrication of CrFeO₃‐Based Humidity Sensing Device with Fast Dynamics for Real‐Time Breath Monitoring and Contact‐Less Sensing