Studies on Dilute Magnetic Semiconducting Co-Doped CdS Thin Films Prepared by Chemical Bath Deposition method

Saravanakumar, S.; Chandramohan, R.; Premarani, R.; Devadasan, J. Jebaraj; Thirumalai, Jagannathan

doi:10.1007/s10854-017-7022-3

Cited by 14 publications

(4 citation statements)

References 21 publications

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“…As depicted in Figure S17, the full-survey-scan spectra illustrate the coexistence of C, N, Cd, and I elements in Cd-MOF , and the O element is newly emerged from the survey spectrum of Cd-MOF-PO . In the high-resolution spectra of Cd 3d, the double peaks at 405.17 and 411.88 eV could be assigned to 3d 5/2 and 3d 3/2 spin-orbit splits of the Cd(II) oxidation state, respectively (Figure c) . With the attack of the oxygen atom of PO to the Cd(II) center, the large electronegativity of O (χ O = 3.44) increases the electronic cloud density around Cd(II), leading to slight shifts of binding energy from 405.17 to 405.28 eV and 411.88 to 412.05 eV .…”

Section: Resultsmentioning

confidence: 99%

“…In the high-resolution spectra of Cd 3d, the double peaks at 405.17 and 411.88 eV could be assigned to 3d 5/2 and 3d 3/2 spin-orbit splits of the Cd(II) oxidation state, respectively (Figure 4c). 67 With the attack of the oxygen atom of PO to the Cd(II) center, the large electronegativity of O (χ O = 3.44) increases the electronic cloud density around Cd(II), leading to slight shifts of binding energy from 405.17 to 405.28 eV and 411.88 to 412.05 eV. 68 Meanwhile, two deconvolution peaks are recognized at 406.63 and 413.66 eV in the Cd 3d XPS spectrum of Cd-MOF-PO.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Dynamic Metal–Iodide Bonds in a Tetracoordinated Cadmium-Based Metal–Organic Framework Boosting Efficient CO₂ Cycloaddition under Solvent- and Cocatalyst-Free Conditions

Qiao

et al. 2022

Inorg. Chem.

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Due to the inherent thermodynamic stability and kinetic inertness of CO2, heterogeneous catalytic conversion of CO2 to cyclic carbonates often requires harsh operating conditions, high temperature and high pressure, and the addition of cocatalysts. Therefore, the development of efficient heterogeneous catalysts under cocatalyst-free and mild conditions for CO2 conversion has always been a challenge. Herein, an infrequent tetracoordinated Cd-MOF was synthesized and used to catalyze CO2 cycloaddition reactions efficiently without the addition of any cocatalyst, and its catalytic mechanism was systematically investigated through a series of experiments, including fluorescence analysis, X-ray photoelectron spectroscopy, microcalorimetry, and density functional theory (DFT) calculation. Cd-MOF features a 3D supermolecule structure with 1D 11.6 × 7.7 Å2 channels, and the abundant Lewis acid/base and I– sites located in the confined channel boost efficient CO2 conversion with a maximum yield of 98.2% and a turnover number value of 1080.11 at 60 °C and 0.5 MPa, far surpassing most pristine MOF-based catalytic systems. A combined experimental and DFT calculation demonstrates that the exposed Cd(II) Lewis acid sites rapidly participate in coordination to activate the epoxides, and the resulting large steric hindrance facilitates leaving of the coordinated iodide ions in a reversibly dynamic fashion convenient for the rate-determining step ring-opening as a strong nucleophile. Such a pristine MOF catalyst with self-independent catalytic ring-opening overcomes the complicated operation limitation of the traditional cocatalyst-free MOF systems based on encapsulating/postmodifying cocatalysts, providing a whole new strategy for the development of simple, green, and efficient heterogeneous catalysts for CO2 cycloaddition.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Dynamic Metal–Iodide Bonds in a Tetracoordinated Cadmium-Based Metal–Organic Framework Boosting Efficient CO₂ Cycloaddition under Solvent- and Cocatalyst-Free Conditions

Qiao

et al. 2022

Inorg. Chem.

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“…The decrease in band gap when CdS deposited on ZnS and CoS could be due to strain and increase in the grain size as shown in SEM micrograph of CdS/ZnS and CdS/CoS films (Figure 2) [43,44]. In the case of CdS/CoS, the band gap decrease can also be resulted from the substitution of some of the Cd ions specially at the interface region by relatively larger atomic radius Co ions [45].…”

Section: Optical Propertiesmentioning

confidence: 95%

Untitled

2021

Int. J. Thin. Fil. Sci. Tec.

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In this work multilayer films of CdS/ZnS and CdS/CoS were prepared using the chemical bath deposition technique. The influence of substrate materials on structural, morphological, compositional and optical properties of the films was investigated. The powder X-ray diffraction (XRD) pattern of CdS/ZnS thin film showed nearly similar structure to that of the cubic ZnS structure. The XRD pattern of CdS/CoS thin films confirmed the co-existence of hexagonal and orthorhombic CdS phases. A cubic CdS structure is observed for CdS/glass thin film. The scanning electron microscopy (SEM) micrograph of CdS/glass film revealed spherical grains of size 125 nm covering the substrate uniformly without voids and cracks. The as large grain size as 800 nm with distinct grain boundaries was observed for CdS/ZnS multilayer film with some voids on the surface. The SEM micrograph of CdS/CoS thin film showed spherical surface grains of size 450 nm on flat and compact background. The energy dispersive X-ray spectra of single and multilayer CdS films confirmed the presence of Cd and S. The optical analysis of the CdS/glass, CdS/ZnS and CdS/CoS thin films confirmed band gaps of 2.5, 2.3 and 2.27 eV respectively.

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“…It has a high absorption coefficient, good transfer efficiency, reliable, and inexpensive [1]. CdS considered as interesting material because it used at different applications for instance diode sensor [2], transistor [3], photosensor [4], photodetectors [5], photodiodes [6]. CdS have been deposited by chemical bath deposition (CBD) method [7], sol-gel [8], pules laser deposition technique (PLD) [9], chemical vapour deposition (CVD) [10], RF-sputtering [11].…”

Section: Introductionmentioning

confidence: 99%

Cadmium sulfide doped with silver as CO2 gas sensor using pyrolysis technique

Al-Jarah¹,

Mohamad

Abdul-Hussein³

2022

IJEECS

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The monitoring of CO2 in our life safety, industrial, and chemical laboratory applications make it an inspiring task. The chemical spray pyrolysis technique was used to prepare CdS/Ag thin films. The nanocrystalline cadmium sulfide thin films were doped with Silver at different doping concentrations (0%, 2%, and 4%). The morphologies, structures, and gas sensing properties of CdS/Ag films are presented. The samples were characterized using X-ray diffraction (XRD) and atomic force microscope (AFM). The XRD results show that the films are a polycrystalline composition and hexagonal type with a favoured orientation along (111) direction. The average grain size (nm) of AFM is between 75 and 55 nm. As a result, Ag doping changes the sensitivity of the samples respectively with the percentage of doping with time. The synthesis samples show controlling sensitivity and the small response of sensitivity are the key point in this study.

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Studies on Dilute Magnetic Semiconducting Co-Doped CdS Thin Films Prepared by Chemical Bath Deposition method

Cited by 14 publications

References 21 publications

Dynamic Metal–Iodide Bonds in a Tetracoordinated Cadmium-Based Metal–Organic Framework Boosting Efficient CO₂ Cycloaddition under Solvent- and Cocatalyst-Free Conditions

Dynamic Metal–Iodide Bonds in a Tetracoordinated Cadmium-Based Metal–Organic Framework Boosting Efficient CO₂ Cycloaddition under Solvent- and Cocatalyst-Free Conditions

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Cadmium sulfide doped with silver as CO2 gas sensor using pyrolysis technique

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Studies on Dilute Magnetic Semiconducting Co-Doped CdS Thin Films Prepared by Chemical Bath Deposition method

Cited by 14 publications

References 21 publications

Dynamic Metal–Iodide Bonds in a Tetracoordinated Cadmium-Based Metal–Organic Framework Boosting Efficient CO2 Cycloaddition under Solvent- and Cocatalyst-Free Conditions

Dynamic Metal–Iodide Bonds in a Tetracoordinated Cadmium-Based Metal–Organic Framework Boosting Efficient CO2 Cycloaddition under Solvent- and Cocatalyst-Free Conditions

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Cadmium sulfide doped with silver as CO2 gas sensor using pyrolysis technique

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Dynamic Metal–Iodide Bonds in a Tetracoordinated Cadmium-Based Metal–Organic Framework Boosting Efficient CO₂ Cycloaddition under Solvent- and Cocatalyst-Free Conditions

Dynamic Metal–Iodide Bonds in a Tetracoordinated Cadmium-Based Metal–Organic Framework Boosting Efficient CO₂ Cycloaddition under Solvent- and Cocatalyst-Free Conditions