Effect of CdS layers on opto-electrical properties of chemically prepared ZnS/CdS/TiO2 photoanodes

T, Sainta Jostar.; Devadason, Suganthi; Suthagar, J.

doi:10.1016/j.mssp.2015.02.021

Cited by 17 publications

(6 citation statements)

References 24 publications

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“…Generally, the phenomenon takes place as lower the electron–hole pair recombination, lower is the PL intensity and higher is the photocatalytic activity. 47,48 The PL spectra of the as-prepared bare CdS NPs (a), binary (CdS–TiO 2 ) (b), and ternary (CdS–TiO 2 /Pd) (c) nanocatalysts excited at 350 nm are shown in Figure 8. Compared to the intensity of bare CdS NPs, it has been observed that CdS–TiO 2 nanocatalysts have a slightly lower intensity, whereas ternary CdS–TiO 2 /Pd has the lowest intensity of them all, indicating that the electron–hole pair recombination is reduced effectively as the lifetimes of photogenerated carriers are elongated due to the synergistic effect of CdS and Pd.…”

Section: Resultsmentioning

confidence: 99%

Preparation of CdS–TiO₂-Based Palladium Heterogeneous Nanocatalyst by Solvothermal Route and Its Catalytic Activity for Reduction of Nitroaromatic Compounds

2019

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In this study, bare CdS nanoparticles (NPs) were prepared by solvothermal method using CdCl2(3-methylbenzaldehyde thiosemicarbazone)2 as a single-source molecular precursor in the presence of ethylene glycol. Further, these CdS NPs were used for the preparation of binary (CdS–TiO2) and ternary (CdS–TiO2/Pd) heterogeneous nanocatalysts. Characterization of the as-prepared nanocatalysts has been carried out using different techniques such as powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), UV–visible diffuse reflectance spectroscopy, and photoluminescence studies. The peak observed at 2θ = 39.5° in XRD confirms the successful doping of noble metal (Pd) on the surface of CdS–TiO2 nanocatalyst, which is well supported by Raman analysis. From FESEM and TEM analyses, mixed morphology has been observed and elemental composition was confirmed by energy-dispersive X-ray spectroscopy elemental mapping. Furthermore, the as-prepared bare CdS NPs, binary CdS–TiO2, and ternary CdS–TiO2/Pd heterogeneous nanocatalysts were used for the reductive transformation of various nitroaromatic compounds to their corresponding aromatic amines at room temperature. It has been observed that among all of the catalysts, ternary CdS–TiO2/Pd heterogeneous nanocatalyst has excellent catalytic property to reduce all nitroaromatic compounds in very short time span.

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Section: Resultsmentioning

confidence: 99%

Preparation of CdS–TiO₂-Based Palladium Heterogeneous Nanocatalyst by Solvothermal Route and Its Catalytic Activity for Reduction of Nitroaromatic Compounds

2019

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Section: Resultsmentioning

confidence: 99%

“…The Pd-based ternary nanocomposites show lower intensities when compared with that of the binary nanocomposites. This phenomenon takes place because the Pd metal in ternary nanocomposites has higher Fermi energy level, which increases the electron-transfer reaction and leads to the prolonged electron–hole pair recombination. , …”

Section: Resultsmentioning

confidence: 99%

“…This phenomenon takes place because the Pd metal in ternary nanocomposites has higher Fermi energy level, which increases the electron-transfer reaction and leads to the prolonged electron−hole pair recombination. 63,64 The catalytic efficiency of the as-prepared Pd-based ternary nanoclusters was evaluated at RT for the reduction of highly toxic Cr(VI) to Cr(III). It was monitored by UV−vis spectra with the absorption peak observed at 349 nm for Cr(VI) as shown in Figure 10.…”

Section: Acs Omegamentioning

confidence: 99%

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One-Pot Synthesis of Pd-Based Ternary Pd@CdS@TiO₂ Nanoclusters via a Solvothermal Route and Their Catalytic Reduction Efficiency toward Toxic Hexavalent Chromium

2018

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In this work, we report the synthesis of Pd-based ternary Pd@CdS@TiO 2 nanocomposites using molecular precursors. This method is facile, less time-consuming, and cost-effective. This catalyst is prepared within 2 h by a solvothermal route using molecular precursors. Information about the phase, morphologies, elemental mapping, and composition of the nanocomposites was obtained using various characterization techniques. The catalytic activity of the as-prepared Pd-based ternary Pd@CdS@TiO 2 nanocomposites exhibits effective reduction efficiency for the conversion of toxic Cr(VI) to Cr(III) using formic acid as a reducing agent within 5–7 min. To the best of our knowledge, this is the first report on Pd-based ternary Pd@CdS@TiO 2 nanocomposites prepared by a solvothermal route and used as catalysts toward the reduction of hexavalent chromium at room temperature.

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“…In recent years, research on QDSCs has mainly concentrated on their photovoltaic conversion and electrochemical properties. [9][10][11][12][13] The study of the transport mechanism of photoinduced free charge carriers (FCCs) in the photoanode consisting of a wide bandgap semiconductor and QD sensitizer is important because the photoanode is a key component for determining the overall performance of QDSC. [14][15][16][17] In the present paper, a mesoporous La-doped nano-TiO 2 thin film is used as a substrate material of the photoanode because it has a direct wide bandgap of more than 3.0 eV.…”

Section: Introductionmentioning

confidence: 99%

Enhanced transient photovoltaic characteristics of core–shell ZnSe/ZnS/L-Cys quantum-dot-sensitized TiO ₂ thin-film

Li¹,

Ren²,

Shen³

2018

Chinese Phys. B

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Photoanodic properties greatly determine the overall performance of quantum-dot-sensitized solar cells (QDSCs). In the present report, the microdynamic behaviors of carriers in the nanocomposite thin-film, a ZnSe QD-sensitized mesoporous La-doped nano-TiO 2 thin-film, as a potential candidate for photoanode, are probed via nanosecond transient photovoltaic (TPV) spectroscopy. The results confirm that the L-Cys ligand has a dual function serving as a stabilizer and molecular linker. Large quantities of interface states are located at the energy level with a photoelectric threshold of 1.58 eV and a quantum well (QW) depth of 0.67 eV. This QW depth is approximately 0.14 eV deeper than the depth of QW buried in the ZnSe QDs, and a deeper QW results in a higher quantum confinement energy. A strong quantum confinement effect of the interface state may be responsible for the excellent TPV characteristics of the photoanode. For example, the peak intensity of the TPV response of the QD-sensitized thin-film lasts a long time, from 9.40 × 10 −7 s to 2.96 × 10 −4 s, and the end time of the PTV response of the QD-sensitized thin-film is extended by approximately an order of magnitude compared with those of the TiO 2 substrate and the QDs. The TPV characteristics of the QD-sensitized thin-film change from p-type to n-type for the QDs before and after sensitizing. These properties strongly depend on the extended diffusion length of the photogenerated carries and the reduced recombination rate of photogenerated electron-hole pairs, resulting in prolonged carrier lifetime and an increased level of electron injection into the TiO 2 thin-film substrate.

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Effect of CdS layers on opto-electrical properties of chemically prepared ZnS/CdS/TiO2 photoanodes

Cited by 17 publications

References 24 publications

Preparation of CdS–TiO₂-Based Palladium Heterogeneous Nanocatalyst by Solvothermal Route and Its Catalytic Activity for Reduction of Nitroaromatic Compounds

Preparation of CdS–TiO₂-Based Palladium Heterogeneous Nanocatalyst by Solvothermal Route and Its Catalytic Activity for Reduction of Nitroaromatic Compounds

One-Pot Synthesis of Pd-Based Ternary Pd@CdS@TiO₂ Nanoclusters via a Solvothermal Route and Their Catalytic Reduction Efficiency toward Toxic Hexavalent Chromium

Enhanced transient photovoltaic characteristics of core–shell ZnSe/ZnS/L-Cys quantum-dot-sensitized TiO ₂ thin-film

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Effect of CdS layers on opto-electrical properties of chemically prepared ZnS/CdS/TiO2 photoanodes

Cited by 17 publications

References 24 publications

Preparation of CdS–TiO2-Based Palladium Heterogeneous Nanocatalyst by Solvothermal Route and Its Catalytic Activity for Reduction of Nitroaromatic Compounds

Preparation of CdS–TiO2-Based Palladium Heterogeneous Nanocatalyst by Solvothermal Route and Its Catalytic Activity for Reduction of Nitroaromatic Compounds

One-Pot Synthesis of Pd-Based Ternary Pd@CdS@TiO2 Nanoclusters via a Solvothermal Route and Their Catalytic Reduction Efficiency toward Toxic Hexavalent Chromium

Enhanced transient photovoltaic characteristics of core–shell ZnSe/ZnS/L-Cys quantum-dot-sensitized TiO 2 thin-film

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Preparation of CdS–TiO₂-Based Palladium Heterogeneous Nanocatalyst by Solvothermal Route and Its Catalytic Activity for Reduction of Nitroaromatic Compounds

Preparation of CdS–TiO₂-Based Palladium Heterogeneous Nanocatalyst by Solvothermal Route and Its Catalytic Activity for Reduction of Nitroaromatic Compounds

One-Pot Synthesis of Pd-Based Ternary Pd@CdS@TiO₂ Nanoclusters via a Solvothermal Route and Their Catalytic Reduction Efficiency toward Toxic Hexavalent Chromium

Enhanced transient photovoltaic characteristics of core–shell ZnSe/ZnS/L-Cys quantum-dot-sensitized TiO ₂ thin-film