Raman and photoluminescence investigation of CdS/CdSe quantum dots on TiO2 nanoparticles with multi-walled carbon nanotubes and their application in solar cells

Lee, Kun‐Mu; Chang, Sheng Hsiung; Wu, Ming C.; Wu, Chun Guey

doi:10.1016/j.vibspec.2015.08.001

Cited by 11 publications

(1 citation statement)

References 32 publications

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“…The Ti−Ti vibrational modes of anatase are located at 140 and 195 cm −1 . 40,41 Rutile's Ti−O vibrational modes are located around 445, 610, and 825 cm −1 , and the Ti−Ti vibrational mode of rutile is located around 140 cm −1 . 41 Since the rutile phase is representing the minority, the only recognizable peaks were at 445 and 791 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

Novel TiO₂/C₃N₄ Photocatalysts for Photocatalytic Reduction of CO₂ and for Photocatalytic Decomposition of N₂O

Reli¹,

Huo²,

Šihor³

et al. 2016

J. Phys. Chem. A

177

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TiO/g-CN photocatalysts with the ratio of TiO to g-CN ranging from 0.3/1 to 2/1 were prepared by simple mechanical mixing of pure g-CN and commercial TiO Evonik P25. All the nanocomposites were characterized by X-ray powder diffraction, UV-vis diffuse reflectance spectroscopy, photoluminescence, X-ray photoelectron spectroscopy, Raman spectroscopy, infrared spectroscopy, transmission electron microscopy, photoelectrochemical measurements, and nitrogen physisorption. The prepared mixtures along with pure TiO and g-CN were tested for the photocatalytic reduction of carbon dioxide and photocatalytic decomposition of nitrous oxide. The pure g-CN exhibited the lowest photocatalytic activity in both cases, pointing to a very high recombination rate of charge carriers. On the other hand, the most active photocatalyst toward all the products was (0.3/1)TiO/g-CN. The highest activity is achieved by combination of a number of factors: (i) specific surface area, (ii) adsorption edge energy, (iii) crystallite size, and (iv) efficient separation of the charge carriers, where the efficient charge separation is the most decisive parameter.

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Section: Resultsmentioning

confidence: 99%

Novel TiO₂/C₃N₄ Photocatalysts for Photocatalytic Reduction of CO₂ and for Photocatalytic Decomposition of N₂O

Reli¹,

Huo²,

Šihor³

et al. 2016

J. Phys. Chem. A

177

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Retorting Photocorrosion and Enhanced Charge Carrier Separation at CdSe Nanocapsules by Chemically Synthesized TiO₂ Shell for Photocatalytic Hydrogen Fuel Generation

et al. 2020

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Metal chalcogenide‐based semiconductor nanostructures are promising candidates for photocatalytic or photoelectrocatalytic hydrogen generation. In order to protect CdSe from photocorrosion, a layer of TiO2 wrapped (shell) onto CdSe (core) nanocapsule via the post‐synthesis process. The morphology studies confirm that a thin crystalline TiO2 shell (3–8 nm) wrapped in all the three directions onto CdSe core and thickness of the shell can be controlled through modulating the titania precursor concentration. The feasibility of pristine CdSe nanocapsules and CdSe@TiO2 in transforming visible light to hydrogen conversion was tested through photocatalysis reaction. The CdSe@TiO2 nanocapsules generated a four‐fold high rate of hydrogen gas (21 mmol.h−1.g−1cat) than pristine CdSe. In order to understand the role of shell@core, we have studied the photoelectrochemical and impedance analysis. The CdSe@TiO2 nanocapsules showed higher photoelectric current generation and lower charge transfer resistance at electrode/electrolyte interfaces compared to pristine CdSe. These studies endorse that chemically synthesized crystalline TiO2 shell played a multifunctional role in (a) surface passivation from photocorrosion, (b) promoting photocharge carrier separation via tunneling process between CdSe and TiO2 interface. As a result, CdSe@TiO2 nanocapsules showed a high conversion efficiency of 12.9 % under visible light irradiation (328 mW.cm−2) and a TOF of 0.05018 s−1.

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Enhancing electrochemical properties of TiO2 nanotube by incorporation of CdSe quantum dots

Rawat

Juyal

et al. 2023

J Nanopart Res

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Raman and photoluminescence investigation of CdS/CdSe quantum dots on TiO2 nanoparticles with multi-walled carbon nanotubes and their application in solar cells

Cited by 11 publications

References 32 publications

Novel TiO₂/C₃N₄ Photocatalysts for Photocatalytic Reduction of CO₂ and for Photocatalytic Decomposition of N₂O

Novel TiO₂/C₃N₄ Photocatalysts for Photocatalytic Reduction of CO₂ and for Photocatalytic Decomposition of N₂O

Retorting Photocorrosion and Enhanced Charge Carrier Separation at CdSe Nanocapsules by Chemically Synthesized TiO₂ Shell for Photocatalytic Hydrogen Fuel Generation

Enhancing electrochemical properties of TiO2 nanotube by incorporation of CdSe quantum dots

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Raman and photoluminescence investigation of CdS/CdSe quantum dots on TiO2 nanoparticles with multi-walled carbon nanotubes and their application in solar cells

Cited by 11 publications

References 32 publications

Novel TiO2/C3N4 Photocatalysts for Photocatalytic Reduction of CO2 and for Photocatalytic Decomposition of N2O

Novel TiO2/C3N4 Photocatalysts for Photocatalytic Reduction of CO2 and for Photocatalytic Decomposition of N2O

Retorting Photocorrosion and Enhanced Charge Carrier Separation at CdSe Nanocapsules by Chemically Synthesized TiO2 Shell for Photocatalytic Hydrogen Fuel Generation

Enhancing electrochemical properties of TiO2 nanotube by incorporation of CdSe quantum dots

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Novel TiO₂/C₃N₄ Photocatalysts for Photocatalytic Reduction of CO₂ and for Photocatalytic Decomposition of N₂O

Novel TiO₂/C₃N₄ Photocatalysts for Photocatalytic Reduction of CO₂ and for Photocatalytic Decomposition of N₂O

Retorting Photocorrosion and Enhanced Charge Carrier Separation at CdSe Nanocapsules by Chemically Synthesized TiO₂ Shell for Photocatalytic Hydrogen Fuel Generation