Fabrication and characterization of CdS doped ZnO nano thick films

Vishwakarma, Ankit Kumar; Yadava, Lallan

doi:10.1016/j.vacuum.2018.06.013

Cited by 27 publications

(5 citation statements)

References 19 publications

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“…[ 44 ] A relatively smaller ionic radius of dopants shrinks the ZnO lattice resulting in a decrease in the relative intensity of the diffraction peaks and their corresponding left shift. [ 45,46 ] This can be confirmed in our results reported in supplementary material, where it is possible to observe the relative intensity peak differences, where doped samples display a reduction of the intensity with reference to the undoped sample (Table S1, Supporting Information). Also, it is well known that the doping generates both oxygen vacancies on the surface and substitutional defects in the bulk reducing the crystallinity of the doped ZnO nanoparticle, which subsequently up‐turns both dislocation density and the average microstrain of the doped samples, [ 47,48 ] as shown in Table 1.…”

Section: Resultssupporting

confidence: 83%

Carbon Dioxide Detectors based on Al‐ and Ni‐Doped ZnO

Lozano-Rosas

Hernandez

Elizalde-González

et al. 2022

Physica Status Solidi (a)

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Humanity all around the world currently faces two serious challenges: global warming and the COVID-19 pandemic. It is well known that the earth's atmosphere is composed of greenhouse gases that act as a shielding blanket, keeping the global temperature in an optimal range. [1] The three main greenhouse gasses which have presented a significant increment in the course of the industrial period are carbon dioxide (CO 2 ), methane (CH 4 ), and nitrous oxide (N 2 O). [2] CO 2 plays a primary role in global warming because of its production due to a wide range of sources like manufacturing processes, automobiles, human respiration, decomposition, ocean release, etc. [3] In contrast, from December 2019 to date, the COVID-19 pandemic is causing a global impact on every sector of society. [4] One of the strategies of mitigation for the pandemic has been CO 2 concentration monitoring in enclosed spaces to measure indoor ventilation requirements and thus reduce the risk of contagion by the aerosol transmission of the virus. Also, it is clear that CO 2 monitoring has become mandatory to maintain air quality.The values of CO 2 concentration in outdoor ambient air are %400 ppm. [5] Regarding CO 2 concentrations in internal environments, the reality is different depending on the country, specific location, and ventilation system; however, according to the document "Recommendations for operation and maintenance of air conditioning and ventilation systems of buildings and premises for the prevention of the spread of SARS-Cov-2" from Spanish Ministry of Health, for good quality air, it is considered that the concentration of CO 2 in the indoor environment with respect to its concentration in the outdoor environment, should not be higher than 500 ppm. [6] ðCO 2 indoor À CO 2 outdoorÞ < 500 ppm CO 2(1)The first decade of the 21 st century was witness to massive production of sensors, [7] driven principally by the growing concern of global warming. However, new sensing technologies were emerged in the past decade, such as calorimetric sensors (CB), metal-oxide-semiconductor field-effect transistor (MOSFET), conducting polymer sensors, electrochemical sensors (EC), metal-oxide semiconductor (MOS), optical sensors, quartz crystal microbalance (QMB), and surface acoustic wave (SAW). [8] Among these, MOS sensors are mostly investigated, due to their excellent sensitivity, very short response times, low cost, minimal noise, small size, low power consumption for adequate battery life, detection of both oxidizing and reducing gases, easy fabrication, and are excellent candidates for miniaturization with high portability. [9][10][11] There is a wide variety of metal oxides employed for CO 2 detection, including pristine materials:

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Section: Resultssupporting

confidence: 83%

Carbon Dioxide Detectors based on Al‐ and Ni‐Doped ZnO

Lozano-Rosas

Hernandez

Elizalde-González

et al. 2022

Physica Status Solidi (a)

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“…Thin films consisting of (CdS/ZnO) nanocomposites have been widely explored due to their applications in the area of optoelectronic, photo-catalysis and optics. [8][9][10][11][12] The CdS possesses a narrow direct optical band gap (∼ 2.4 eV) and is extensively used as a visible light photocatalyst. The CdS is the most appropriate visible sensitizer for zinc oxide (ZnO) because its crystal lattice constant is similar to that of ZnO, having the optical band-gap energy in the visible light region creating a heterojunction with zinc oxide, which enables a very fast interband electronic charge transfer between these compounds.…”

Section: Introductionmentioning

confidence: 99%

Structural and optical characteristic features of RF sputtered CdS/ZnO thin films*

et al. 2020

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In this study, CdS/ZnO (2:3 mol%) thin films are successfully deposited on quartz substrates by using the sputtering technique. Good images on the structural and optical characteristic features of CdS/ZnO thin films before and after annealing are obtained. The CdS/ZnO thin films are annealed respectively at temperatures of 373 K, 473 K, and 573 K and the structural features are examined by XRD, ATR-FTIR, and FESEM. The optical properties of CdS/ZnO thin films such as refractive indices, absorption coefficients, optical band gap energy values, Urbach energy values, lattice dielectric constants, and high frequency dielectric constants are determined from spectrophotometer data recorded over the spectral range of 300 nm–2500 nm. Dispersion parameters are investigated by using a single-oscillator model. Photoluminescence spectra of CdS/ZnO thin films show an overall decrease in their intensity peaks after annealing. The third-order nonlinear optical parameter, and nonlinear refractive index are also estimated.

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“…The crystalline size can be calculated by the well-known formula given by the Debye Scherer relationship. 22,23 In this case, k = 0.94, where λ is the X-ray source's wavelength, β is the full width at half maximum (FWHM), and θ is the diffraction angle. The crystallite sizes of samples S 1 , S 2 , and S 3 are found at 25.1 nm, 16.1 nm, and 13.9 nm, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The crystalline size can be calculated by the well-known formula given by the Debye Scherer relationship. 22,23 D ¼ lk b cos q…”

Section: Xrdmentioning

confidence: 99%

Study of the response behavior of a CdS–SnO₂ thick film for high selectivity towards propanol gas

Vishwakarma,

Sharma,

Yadava

2024

RSC Adv.

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Fabrication and characterization of CdS doped ZnO nano thick films

Cited by 27 publications

References 19 publications

Carbon Dioxide Detectors based on Al‐ and Ni‐Doped ZnO

Carbon Dioxide Detectors based on Al‐ and Ni‐Doped ZnO

Structural and optical characteristic features of RF sputtered CdS/ZnO thin films*

Study of the response behavior of a CdS–SnO₂ thick film for high selectivity towards propanol gas

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Fabrication and characterization of CdS doped ZnO nano thick films

Cited by 27 publications

References 19 publications

Carbon Dioxide Detectors based on Al‐ and Ni‐Doped ZnO

Carbon Dioxide Detectors based on Al‐ and Ni‐Doped ZnO

Structural and optical characteristic features of RF sputtered CdS/ZnO thin films*

Study of the response behavior of a CdS–SnO2 thick film for high selectivity towards propanol gas

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Study of the response behavior of a CdS–SnO₂ thick film for high selectivity towards propanol gas