X-ray Photoelectron Spectroscopy of CdSe Nanocrystals with Applications to Studies of the Nanocrystal Surface

Katari, J. E. B.; Colvin, Vicki L.; Alivisatos, A. Paul

doi:10.1021/j100066a034

Cited by 1,084 publications

(731 citation statements)

References 5 publications

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“…Though the photooxidation product of CdSe nanoparticles has not been analyzed in the present experiment, the previous investigation has confirmed the formation of SeO 2 as a oxidation product. 24 Furthermore, it has been reported that the photoirradiation of an aqueous solution containing CdSe nanoparticles caused the liberation of Cd 2+ ions in the solution along with the photo- oxidation of CdSe. Thus, the net reaction is reasonably assumed to be eq 1.…”

Section: Resultsmentioning

confidence: 99%

Photochemical Fine-Tuning of Luminescent Color of Cadmium Selenide Nanoparticles: Fabricating a Single-Source Multicolor Luminophore

et al. 2006

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Size-selective photoetching was applied to silica-coated cadmium selenide (SiO 2 /CdSe) nanoparticles to precisely control their photoluminescence properties. The absorption spectra of CdSe was blue-shifted by irradiation of monochromatic light, and finally, the absorption onset agreed with the wavelength of irradiation light, indicating that CdSe particles were photoetched to smaller ones until the irradiated photons were not absorbed by the photoetched particles and that the SiO 2 shell layer surrounding the CdSe core prevented coalescence between the photoetched particles. Although as-prepared SiO 2 /CdSe did not exhibit photoluminescence, the application of size-selective photoetching to SiO 2 /CdSe resulted in the development of the band gap emission, with the degree being enhanced with progress of the photoetching. The peak wavelength of photoluminescence decreased with a decrease in the wavelength used for the photoetching, so that the luminescence color could be tuned between red and blue. Partial photoetching of SiO 2 /CdSe nanoparticle films produced intense band gap emission of CdSe at the photoetched area, while the remainder of the SiO 2 / CdSe films did not exhibit detectable photoluminescence, resulting in the formation of a clear photoluminescence image under UV irradiation. This technique makes it possible to produce a multicolored photoluminescence image by irradiation with monochromatic lights having various wavelengths using a single source material.

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Section: Resultsmentioning

confidence: 99%

Photochemical Fine-Tuning of Luminescent Color of Cadmium Selenide Nanoparticles: Fabricating a Single-Source Multicolor Luminophore

et al. 2006

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“…Also in these systems, binding dynamics and surface diffusion are found (Moreels et al 2007); the surface coverage may depend on the particle size and geometric shape of the ligand molecules involved (Bowen-Katari et al 1994). Besides TOP and/or TOPO, hexadecylamine or other amines are also commonly used ligands for CdSe quantum dots (Ji et al 2008), which can also be replaced by stronger binding molecules, e.g.…”

Section: (C) Ligand Exchangementioning

confidence: 99%

Surface modification, functionalization and bioconjugation of colloidal inorganic nanoparticles

Sperling

Parak

2010

Phil. Trans. R. Soc. A.

1,373

1,085

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Inorganic colloidal nanoparticles are very small, nanoscale objects with inorganic cores that are dispersed in a solvent. Depending on the material they consist of, nanoparticles can possess a number of different properties such as high electron density and strong optical absorption (e.g. metal particles, in particular Au), photoluminescence in the form of fluorescence (semiconductor quantum dots, e.g. CdSe or CdTe) or phosphorescence (doped oxide materials, e.g. Y 2 O 3 ), or magnetic moment (e.g. iron oxide or cobalt nanoparticles). Prerequisite for every possible application is the proper surface functionalization of such nanoparticles, which determines their interaction with the environment. These interactions ultimately affect the colloidal stability of the particles, and may yield to a controlled assembly or to the delivery of nanoparticles to a target, e.g. by appropriate functional molecules on the particle surface. This work aims to review different strategies of surface modification and functionalization of inorganic colloidal nanoparticles with a special focus on the material systems gold and semiconductor nanoparticles, such as CdSe/ZnS. However, the discussed strategies are often of general nature and apply in the same way to nanoparticles of other materials.

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“…A similar type of immobilization of CdS nanoparticles onto 3,3′-dithiobis(succinimidyl propionate) SAM through the amide bond has been also reported. 17 Although these reports briefly discussed the surface structure of the CdS nanoparticles and/or the nature of the binding between SAM and semiconductor nanoparticles, 13,14 the detailed characterization of surface structure, which may decisively influence the device property, has not yet been completed.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of CdS-Nanoparticle Mono- and Multilayers on a Self-Assembled Monolayer of Alkanedithiols on Gold

1998

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Mono-and multilayers of cadmium sulfide (CdS) nanoparticles were fabricated on a gold substrate covered with alkanedithiol self-assembled monolayers (SAMs) by an alternate immersion of the substrate into ethanolic solutions of dithiol, i.e., 1,6-hexanedithiol or 1,10-decanedithiol, and dispersion of CdS nanoparticles (ca. 3 nm in diameter), the latter of which was prepared in sodium bis(2-ethylhexyl)sulfosuccinate (Aerosol OT, AOT)/H 2 O/heptane reversed micelles. A layer-by-layer structure of dithiol SAM and CdS monolayer was confirmed with Fourier transform infrared reflection-absorption spectroscopy (FT-IRRAS) and X-ray photoelectron spectroscopy (XPS) at each step of composite-film preparation. It was revealed that CdS nanoparticles on SAMs were surrounded by AOT, which was then substituted by dithiols when the film was treated with the dithiol solution. The amount of CdS nanoparticles on the sample was measured by inductively coupled plasma mass spectrometry (ICP-MS) to be consistent with the above-mentioned monolayer structure. The photoinduced anodic current was observed when the composite film was immersed in an electrolyte solution containing triethanolamine as an electron donor. An action spectrum, which was quite similar to the absorption spectrum of CdS dispersion, indicates that the CdS nanoparticle keeps its size without mutual aggregation, and semiconducting properties even after being immobilized on the substrate.

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X-ray Photoelectron Spectroscopy of CdSe Nanocrystals with Applications to Studies of the Nanocrystal Surface

Cited by 1,084 publications

References 5 publications

Photochemical Fine-Tuning of Luminescent Color of Cadmium Selenide Nanoparticles: Fabricating a Single-Source Multicolor Luminophore

Photochemical Fine-Tuning of Luminescent Color of Cadmium Selenide Nanoparticles: Fabricating a Single-Source Multicolor Luminophore

Surface modification, functionalization and bioconjugation of colloidal inorganic nanoparticles

Fabrication and Characterization of CdS-Nanoparticle Mono- and Multilayers on a Self-Assembled Monolayer of Alkanedithiols on Gold

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