Journal ArticleDOI
CdS and CdTeS quantum dot decorated TiO2 nanowires. Synthesis and photoefficiency.
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TLDR
This study indicates that the generation of strongly anchored CdS and CdTeS QDs on a TiO(2) nanowire surface is achievable without introduction of a linker molecule, whose presence is known to decrease the electron injection efficiency.Abstract:
An easy process was developed to synthesize TiO2 nanowires sensitized with CdS and CdTeS quantum dots (QDs) requiring no pretreatment of the TiO2 nanowires prior to nanoparticle generation. CdS and CdTeS nanoparticles were firstly grown by an in situ colloidal method directly onto the TiO2 surface, hence not requiring subsequent functionalization of the QDs. The resulting nanostructure assembly and composition was confirmed by transmission electron microscopy (TEM), x-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. Successful decoration of the TiO2 nanowires by the QDs was observed by TEM, while XPS spectra provided clear evidence for the coexistence of CdS and CdTeS QDs and TiO2 nanowires. The electronic structure of the TiO2 nanowires was preserved as indicated by Raman spectroscopy. Preliminary photocurrent measurements showed that inclusion of Te in CdS QDs improved the photocurrent efficiency. Compared to bare TiO2 nanowires, CdS/TiO2 nanoassemblies showed an enhancement in photocurrent efficiency of 300% while CdTeS/TiO2 presented an improvement of 350%. This study indicates that the generation of strongly anchored CdS and CdTeS QDs on a TiO2 nanowire surface is achievable without introduction of a linker molecule, whose presence is known to decrease the electron injection efficiency.read more
Citations
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One-Dimensional Titanium Dioxide Nanomaterials: Nanowires, Nanorods, and Nanobelts
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Future CO2 Emissions and Climate Change from Existing Energy Infrastructure
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All-solid-state Z-scheme system of RGO-Cu2O/Bi2O3 for tetracycline degradation under visible-light irradiation
TL;DR: In this article, a series of RGO-Cu2O/Bi2O3 composite photocatalysts was developed by depositing Cu2O and Bi2O 3 nanocrystals on the surface of the RGO via an in situ precipitation method, which favored the transfer of photogenerated electrons and holes towards an effective path.
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References
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Journal ArticleDOI
Photocatalysis on TiO2 Surfaces - Principles, Mechanisms, and Selected Results
TL;DR: In this article, the authors focus on interfacial processes and summarize some of the operating principles of heterogeneous photocatalysis systems, including the electron transfer and energy transfer processes in photocatalytic reactions.
Journal ArticleDOI
Synthesis and characterization of nearly monodisperse CdE (E = sulfur, selenium, tellurium) semiconductor nanocrystallites
TL;DR: In this paper, a simple route to the production of high-quality CdE (E=S, Se, Te) semiconductor nanocrystallites is presented, based on pyrolysis of organometallic reagents by injection into a hot coordinating solvent.
Journal ArticleDOI
Quantum Dot Bioconjugates for Ultrasensitive Nonisotopic Detection
Warren C. W. Chan,Shuming Nie +1 more
TL;DR: Highly luminescent semiconductor quantum dots (zinc sulfide-capped cadmium selenide) have been covalently coupled to biomolecules for use in ultrasensitive biological detection and these nanometer-sized conjugates are water-soluble and biocompatible.
Journal ArticleDOI
Formation of high-quality CdTe, CdSe, and CdS nanocrystals using CdO as precursor.
Peng Za,Xiaogang Peng +1 more
TL;DR: This paper proves that Cd(CH3)2 can be replaced by CdO and develops a one-pot synthesis which does not require separated preparation of cadmium complex and is reproducible and simple and thus can be readily scaled up for industrial production.
Journal ArticleDOI
Quantum Dot Solar Cells. Semiconductor Nanocrystals as Light Harvesters
TL;DR: In this paper, three major ways to utilize semiconductor dots in solar cell include (i) metal−semiconductor or Schottky junction photovoltaic cell, (ii) polymer−smiconductor hybrid solar cell, and (iii) quantum dot sensitized solar cell.
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