Enhanced room temperature ammonia gas sensing properties of Al-doped ZnO nanostructured thin films

Devi, K. Radhi; Selvan, G.; Karunakaran, M.; Raj, I. Loyola Poul; El‐Rehim, A. F. Abd; Zahran, H.Y.; Shkir, Mohd.; AlFaify, S.

doi:10.1007/s11082-020-02621-0

Cited by 16 publications

(3 citation statements)

References 78 publications

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“…2 versus hν to estimate optical band gap of the CdO:Se film, respectively. In estimating the optical band gap, the relationship between the photon energy (hν) and the absorption coefficient (α) is given by the following equation [38]:…”

Section: Resultsmentioning

confidence: 99%

Long‐term stable and high responsivity visible-ultraviolet photodetector of Se-doped CdO film on Si by spin coating

Şakar

Orhan

Yıldırım

et al. 2023

J. Phys. D: Appl. Phys.

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Se-doped CdO thin films were prepared on p-Si substrates via spin coating. Morphological, structural and absorption measurements of CdO:Se film was performed. Then, a CdS:Se/p-Si heterojunction was produced by coating CdO:Se film on a p-Si substrate using spin coating method. From the I-V measurements, it has been seen that the device has a very good rectification feature in the dark, at room temperature. In order to investigate the performance of the device under light, a detailed analysis was performed by performing I-V measurements under UV light (365 and 395 nm, 10 mW/cm2) and different intensities of visible light (between 10-125 mW/cm2) as well as ambient light. It was observed that the CdO:Se/p-Si heterojunction performed well under both illumination conditions. The maximum responsivity and specific detectivity values were obtained as 0.72 and 4.47 A/W and 3.31×109 and 2.05×1010 Jones for visible and UV regions, respectively. It was also seen that the device exhibited very high performance and stability even after 160 days.

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Section: Resultsmentioning

confidence: 99%

Long‐term stable and high responsivity visible-ultraviolet photodetector of Se-doped CdO film on Si by spin coating

Şakar

Orhan

Yıldırım

et al. 2023

J. Phys. D: Appl. Phys.

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“…Calculated by this method, the sensitivity and the detection limit in case of NH 3 are, respectively, 0.03 Hz/ppm and 100 ppm at the shown optimal doping concentration of 3 × 10 −5 M. Based on the found optimal doping concentration, these parameters could be significantly improved by the variation of deposition parameters (time and temperature), as well as other known approaches. For Al-doped ZnO thin films in [33] and in [34], the reported response for ammonia is 100 ppm at room temperature and 25 ppm at 100 • C, respectively. The difference in sensitivity between ethanol and ammonia is due to the significantly higher binding energy of ammonia to ZnO (14.6 eV) than that of ethanol to ZnO (3.2 eV) [35].…”

Section: Concentration Ofmentioning

confidence: 99%

Influence of Al Doping on the Morphological, Structural and Gas Sensing Properties of Electrochemically Deposited ZnO Films on Quartz Resonators

et al. 2022

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The detection of hazardous gases at different concentration levels at low and room temperature is still an actual and challenging task. In this paper, Al-doped ZnO thin films are synthesized by the electrochemical deposition method on the gold electrodes of AT-cut quartz resonators, vibrating at 10 MHz. The average roughness, surface morphology and gas sensing properties are investigated. The average roughness of Al-doped ZnO layers strongly depends on the amount of the doping agent Al2(SO4)3 added to the solution. The structural dependence of these films with varying Al concentrations is evident from the scanning electron microscopy images. The sensing properties to ethanol and ammonia analytes were tested in the range of 0–12,800 ppm. In the analysis of the sensitivity to ammonia, a dependence on the concentration of the added Al2(SO4)3 in the electrochemically deposited layers is also observed, as the most sensitive layer is at 3 × 10−5 M. The sensitivity and the detection limit in case of ammonia are, respectively, 0.03 Hz/ppm and 100 ppm for the optimal doping concentration. The sensitivity depends on the active surface area of the layers, with those with a more developed surface being more sensitive. Al-doped ZnO layers showed a good long-term stability and reproducibility towards ammonia and ethanol gases. In the case of ethanol, the sensitivity is an order lower than that for ammonia, as those deposited with Al2(SO4)3 do not practically react to ethanol.

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“…H A. Varudkar et al [ 53 ] synthesised Al-doped ZnO nanoparticles by the co-precipitation method and obtained a spherical morphology; they reported sensing performance towards NH 3 as low as 10 ppm at room temperature. K. R. Devi et al [ 67 ] used the SILAR approach to synthesise Al-doped ZnO nanoparticles with a nanowire structure; they reported NH 3 sensing performance as low as 100 ppm at ambient temperature. L. H. Kathwate et al [ 68 ] employed spray pyrolysis to produce Al-doped ZnO nanoparticles with NH 3 sensing capability as low as 25 ppm at 100 °C.…”

Section: Selectivity and Sensing Mechanismmentioning

confidence: 99%

A nanostructured Al-doped ZnO as an ultra-sensitive room-temperature ammonia gas sensor

Bantikatla

Devi

Nagaraju³

et al. 2023

J Mater Sci: Mater Electron

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Novel chemi-resistive gas sensors with strong detection capabilities operating at room temperature are desirable owing to their extended cycle life, high stability, and low power consumption. The current study focuses on detecting NH 3 at room temperature using lower gas concentrations. The co-precipitation technique was employed to produce pure and Al-doped ZnO nanoparticles, which were calcined at 300 °C for three hours. The effect of aluminium (Al) doping on the structural, morphological, optical, and gas-sensing abilities was investigated and reported. The presence of aluminium was confirmed by XRD, EDX, and FTIR spectroscopy. Additionally, to assess the various characteristics of Al-doped ZnO nanoparticles, scanning electron microscopy (SEM), ultraviolet–visible diffuse reflectance spectroscopy (UV-DRS), atomic force microscopy (AFM), and Brunauer–Emmett–Teller (BET) techniques were used. The crystallite size increased from 14.82 to 17.49 nm in the XRD analysis; the SEM pictures showed a flower-like morphology; and the energy gap decreased from 3.240 to 3.210 eV when Al doping was raised from 1 wt% to 4 wt%. AFM studies revealed topographical information with significant roughness in the range of 230–43 nm. BET analysis showed a mesoporous nature with surface areas varying from 25.274 to 14.755 m 2 /g and pore diameters ranging from 8.34 to 7.00 nm. The sensing capacities of pure and Al-doped ZnO nanoparticles towards methanol (CH 3 OH), toluene (C 7 H 8 ), ethanol (C 2 H 5 OH), and ammonia (NH 3 ) were investigated at room temperature. The one-wt% Al-doped ZnO sensor demonstrated an ultrafast response and recovery times at one ppm compared to other AZO-based sensors towards NH 3 .

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Enhanced room temperature ammonia gas sensing properties of Al-doped ZnO nanostructured thin films

Cited by 16 publications

References 78 publications

Long‐term stable and high responsivity visible-ultraviolet photodetector of Se-doped CdO film on Si by spin coating

Long‐term stable and high responsivity visible-ultraviolet photodetector of Se-doped CdO film on Si by spin coating

Influence of Al Doping on the Morphological, Structural and Gas Sensing Properties of Electrochemically Deposited ZnO Films on Quartz Resonators

A nanostructured Al-doped ZnO as an ultra-sensitive room-temperature ammonia gas sensor

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