Wrinkle type nanostructured Y-doped ZnO thin films for oxygen gas sensing at lower operating temperature

Choudhary, K. M.; Saini, Richa; Upadhyay, Gaurav; Rana, Vijay S.; Purohit, L.P.

doi:10.1016/j.materresbull.2021.111342

Cited by 13 publications

(5 citation statements)

References 39 publications

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“…On the other hand, lattice constants (a and c) and d-spacing values increased for the Y-doped ZnO samples. These results are due to the substitution of the smaller Zn 2 ions by the larger Y 3 ions in the ZnO unit cell, which causes the extension for the Y-doped ZnO samples in comparison to pure ZnO [15]. Fig.…”

Section: Resultsmentioning

confidence: 96%

Untitled

2021

DJNB

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In this work, Y-doped ZnO nanoparticles were precipitately synthesized for various yttrium molar percentage values ranging from 0 to 5%, and then utilized as photocatalysts to demonstrate methylene blue degradation. Morphology shows that the particle size of pure ZnO is 113.7733.26 nm, which is reduced to the minimum value less than one-third for the Y-doped ZnO samples. As a result, surface-to-volume ratios of Y-doped ZnO samples have successfully increased due to their decreased size. This decrease in particle size is consistent with the small crystalline size, primarily due to low crystallization in the presence of yttrium doping. However, the expansion of the crystal structure is observed. Chemical surface structures point to the major vibration of ZnO. However, some carbon-relating groups remain to appear. Optical property reveals similar trends for all Y-doped ZnO samples. The estimated band gap energy (E g ) was reduced to the minimum value for the 4 mol% condition. For use as a photocatalyst, the appropriate Y-doped ZnO for 4 mol% yttrium doping presents the maximum degradation efficiency of 61.19%. The improvement in photocatalytic degradation is caused by the synergy of decreased particle size and reduced E g . Therefore, yttrium plays a role to decrease particle size and reduce E g of Y-doped ZnO materials, thus leading to enhance photocatalytic performance.

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Section: Resultsmentioning

confidence: 96%

Untitled

2021

DJNB

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“…This is probably because of the partial substitution of Zn 2+ in the pure sample by Dy 3+ in the doped thin film and the thinner film. As a result, the additional free electrons are released into the conduction band, increasing the electrical conductivity [ 13 ]. In order to study the relaxation time as a function of temperature, the variation in the imaginary part of impedance Z” versus angular frequency at different temperatures of ZnO undoped and doped thin films are presented in Figure 5 c,d.…”

Section: Resultsmentioning

confidence: 99%

“…However, sensing devices composed of pure ZnO usually present limited specificity to gas compounds [ 11 ]. In this sense, the use of additional nanomaterials for decorating or doping ZnO is a widely adopted strategy to improve sensing properties such as selectivity and sensitivity or to reduce the optimum operating temperature [ 12 , 13 , 14 ]. Most of the research studies are centered on the use of alternative metal or metal oxide compounds for doping ZnO [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Dysprosium Doped Zinc Oxide for NO2 Gas Sensing

Fidha

Bitri

Mahjoubi

et al. 2022

Sensors

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Pure and dysprosium-loaded ZnO films were grown by radio-frequency magnetron sputtering. The films were characterized using a wide variety of morphological, compositional, optical, and electrical techniques. The crystalline structure, surface homogeneity, and bandgap energies were studied in detail for the developed nanocomposites. The properties of pure and dysprosium-doped ZnO thin films were investigated to detect nitrogen dioxide (NO2) at the ppb range. In particular, ZnO sensors doped with rare-earth materials have been demonstrated as a feasible strategy to improve the sensitivity in comparison to their pure ZnO counterparts. In addition, the sensing performance was studied and discussed under dry and humid environments, revealing noteworthy stability and reliability under different experimental conditions. In this perspective, additional gaseous compounds such as ammonia and ethanol were measured, resulting in extremely low sensing responses. Therefore, the gas-sensing mechanisms were discussed in detail to better understand the NO2 selectivity given by the Dy-doped ZnO layer.

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“…The past published reports on PDs indicate that in most of the PDs, GaN and silicon have been used as absorbing layers. – However, due to the blurring of optical signals between neighboring pixels, cross-talk of optical signals, low band gap, poor efficiency, and high cost of these materials, researchers take interest in other semiconductors like ZnS, CdS, V 2 O 5 , CeO 2 , CuO, ZnO, etc. ,– Out of these semiconducting materials, ZnO is the most preferable material for making PDs because of its unique properties like wide direct band gap (∼3.37 eV), large exciton energy (60 meV), nontoxicity, transparency, and thermal stability. – The most interesting property is its large excitonic binding energy of 60 meV at room temperature, which makes ZnO an efficient light emitter. – Also, the crystal growth of ZnO is easier than that in most semiconductors. Due to these unique desirable properties, ZnO can be essentially used as a high-response photodetector (PD) which could be fabricated with both Schottky and ohmic contacts . However, a key issue with pristine ZnO (also with most wide-band-gap metal oxides) is that it can work for ultraviolet (UV) photodetection, as allowed by its wide-band-gap structure, while many areas require a photosensor which can detect visible light.…”

Section: Introductionmentioning

confidence: 99%

“…Due to these unique desirable properties, ZnO can be essentially used as a high-response photodetector (PD) which could be fabricated with both Schottky and ohmic contacts. 25 However, a key issue with pristine ZnO (also with most wide-band-gap metal oxides) is that it can work for ultraviolet (UV) photodetection, as allowed by its wide-band-gap structure, 26 while many areas require a photosensor which can detect visible light. Several past research works stated that doping of various transition metals in ZnO can tune its optical and optoelectronic properties.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Visible-Light Photodetection with Undoped and Doped ZnO Thin-Film Self-Powered Photodetectors

Singh,

Ambedkar,

Tyagi

et al. 2023

ACS Omega

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Photodetection plays an essential role in the visiblelight zone and is important in modern science and technology owing to its potential applications in various fields. Fabrication of a stable photodetector remains a challenge for researchers. We demonstrated a high-response/recovery and self-powered undoped ZnO (UZO) and Cu-doped ZnO (CZO) thin film-based visible-light photodetector fabricated on a cost-effective Si substrate using reactive cosputtering. The structural, morphological, and optical properties of CZO and UZO thin films have been examined using X-ray diffraction, field emission scanning electron microscopy, X-ray photoelectron spectroscopy, atomic force microscopy, and photoluminescence spectroscopy. The results of the CZO/n-Si photodetector compared with those of the undoped ZnO (UZO)/n-Si photodetector show that the CZO/n-Si exhibits a higher on/off ratio, responsivity, and detectivity than UZO/n-Si. Also, the CZO/ n-Si photodetector shows high stability and reproducibility over 20 cycles after 180 days. A relative study of CZO/n-Si-and UZO/n-Si-based photodetectors reveals the enhanced performance of the CZO/n-Si photodetector, which has a high on/off ratio of ∼300 with a high specific detectivity of 2.8 × 10 10 Jones for 75 mW visible light. The prepared self-powered CZO/n-Si/Ag thin film-based visible-light photodetector paves the way for the development of high-performance photodetector designs.

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Wrinkle type nanostructured Y-doped ZnO thin films for oxygen gas sensing at lower operating temperature

Cited by 13 publications

References 39 publications

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Dysprosium Doped Zinc Oxide for NO2 Gas Sensing

Enhanced Visible-Light Photodetection with Undoped and Doped ZnO Thin-Film Self-Powered Photodetectors

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