Optical properties of selenium sols

Watillon, André; Dauchot, Josette

doi:10.1016/0021-9797(68)90188-4

Cited by 36 publications

(26 citation statements)

References 27 publications

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“…Since the Bohr radius of the exciton in trigonal selenium amounts to 1.55 nm [9], the changes in the optical characteristics of the selenium particles investigated in the present work during their enlargement are clearly not due to changes in the electronic structure of the Se nanoparticles and the quantum dimensional effects accompanying them. In [1, 7,8] it was demonstrated that similar spectral changes in the investigated range of sizes of selenium nanoparticles were due largely to increased Raleigh scattering with increase in the size of the selenium particles and were closely described by Mie's theory.…”

Section: The Absorption Spectra Of Se Nanoparticlesmentioning

confidence: 87%

“…If the selenium nanoparticles are stabilized by other polymers (PVA, SPP, PEG 600) the E g values calculated from the absorption spectra are somewhat lower than E g bulk . This may be due to the superimposition of the plasmon absorption band of selenium [7,8] at the edge of the band corresponding to the indirect electronic transition, which is seen most clearly in the case of the stabilization of the selenium nanoparticles with polyethyleneglycol (see Fig. 2a, curve 3).…”

Section: The Absorption Spectra Of Se Nanoparticlesmentioning

confidence: 92%

“…Thus, in [7] it was shown that it is possible to vary the size of the selenium nanoparticles in the range of 40-500 nm and obtain highly monodisperse sols of selenium by varying the size of the gold nanoparticles used as centers for the nucleation of the selenium nanoparticles during the reduction of sodium selenite. On the other hand, by restricting this reaction in the volume of the micelles from sodium dodecylsulfonate [1], it is possible to obtain selenium nanoparticles with a size of 20-240 nm, which is determined by the internal volume of the micelle and depends on the concentration of water and surfactant.…”

mentioning

confidence: 99%

“…It was shown that during the deposition of CdS and Cd 0.5 Zn 0.5 S on the surface of the Se nanoparticles followed by dissolution of the selenium with sodium sulfite it is possible to obtain network "nanoframeworks" with size 30-50 nm, formed by CdS or Cd 0.5 Zn 0.5 S particles measuring 3-5 nm.The increased interest in nanostructures based on selenium, observed in recent years, is due to a series of its unique characteristics -high photoconductivity, high nonlinear optical and piezo-and thermoelectrical responses, catalytic activity in oxidation and hydrogenation, ability to act as antioxidants in biological systems [1-6], and others.Most methods for the production of selenium nanoparticles (NP) of given size are based on the use of a template, i.e., nanoparticles of various types on which selenium is deposited from a reaction mixture [7,8], or a reaction leading to the formation of selenium in a restricted space [1,2]. Thus, in [7] it was shown that it is possible to vary the size of the selenium nanoparticles in the range of 40-500 nm and obtain highly monodisperse sols of selenium by varying the size of the gold nanoparticles used as centers for the nucleation of the selenium nanoparticles during the reduction of sodium selenite.…”

mentioning

confidence: 99%

“…Most methods for the production of selenium nanoparticles (NP) of given size are based on the use of a template, i.e., nanoparticles of various types on which selenium is deposited from a reaction mixture [7,8], or a reaction leading to the formation of selenium in a restricted space [1,2]. Thus, in [7] it was shown that it is possible to vary the size of the selenium nanoparticles in the range of 40-500 nm and obtain highly monodisperse sols of selenium by varying the size of the gold nanoparticles used as centers for the nucleation of the selenium nanoparticles during the reduction of sodium selenite.…”

mentioning

confidence: 99%

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Structure and spectral-optical characteristics of Se, Se/CdS, and Se/Cd0.5Zn0.5S nanoparticles, stabilized in polymer-containing media

et al. 2007

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A method was proposed for the production of colloidal nanoparticles of selenium stabilized by polymers and surfactants, and their structural and optical characteristics were studied. It was shown that during the deposition of CdS and Cd 0.5 Zn 0.5 S on the surface of the Se nanoparticles followed by dissolution of the selenium with sodium sulfite it is possible to obtain network "nanoframeworks" with size 30-50 nm, formed by CdS or Cd 0.5 Zn 0.5 S particles measuring 3-5 nm.The increased interest in nanostructures based on selenium, observed in recent years, is due to a series of its unique characteristics -high photoconductivity, high nonlinear optical and piezo-and thermoelectrical responses, catalytic activity in oxidation and hydrogenation, ability to act as antioxidants in biological systems [1-6], and others.Most methods for the production of selenium nanoparticles (NP) of given size are based on the use of a template, i.e., nanoparticles of various types on which selenium is deposited from a reaction mixture [7,8], or a reaction leading to the formation of selenium in a restricted space [1,2]. Thus, in [7] it was shown that it is possible to vary the size of the selenium nanoparticles in the range of 40-500 nm and obtain highly monodisperse sols of selenium by varying the size of the gold nanoparticles used as centers for the nucleation of the selenium nanoparticles during the reduction of sodium selenite. On the other hand, by restricting this reaction in the volume of the micelles from sodium dodecylsulfonate [1], it is possible to obtain selenium nanoparticles with a size of 20-240 nm, which is determined by the internal volume of the micelle and depends on the concentration of water and surfactant. Ultrasmall nanoparticles of selenium and also separate Se 8 rings can be produced by reducing Se(IV) compounds in the pores of zeolite [2].In the present work it was shown that selenium nanoparticles can be obtained easily under relatively mild conditions by the acidic decomposition of Na 2 SeSO 3 in aqueous solutions of stabilizing polymers. The structural and spectral-optical characteristics of Se nanoparticles produced under various conditions are discussed. The processes leading to the formation of composite Se/CdS and Se/Cd 0.5 Zn 0.5 S nanostructures and also their transformation into network "nanoframeworks," consisting of CdS or Cd 0.5 Zn 0.5 S nanoparticles, are examined. 280040-5760/07/4301-0028

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Section: The Absorption Spectra Of Se Nanoparticlesmentioning

confidence: 87%

Section: The Absorption Spectra Of Se Nanoparticlesmentioning

confidence: 92%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Structure and spectral-optical characteristics of Se, Se/CdS, and Se/Cd0.5Zn0.5S nanoparticles, stabilized in polymer-containing media

et al. 2007

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Synthesis and Characterization of Uniform Nanowires of Trigonal Selenium

et al. 2002

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This article describes a soft, solution‐phase approach to the large‐scale synthesis of uniform nanowires of trigonal selenium (t‐Se) with lateral dimensions controllable in the range of ∼10 to ∼800 nm, and lengths up to hundreds of micrometers. These highly anisotropic, one‐dimensional (1D) nanostructures were directly nucleated and grown from aqueous solutions without the help of any physical templates, such as channel‐like structures etched in porous materials, or scaffolds assembled from surfactants or block‐copolymers. The 1D morphology of the product was solely determined by the linear characteristics of the building blocks—i.e., the extended, helical chains of atoms contained in the crystalline lattice of t‐Se. A blue shift was observed for the bandgap and interchain transition of these nanowires when their diameters were reduced from ∼32 to ∼10 nm. The photoconductivity of individual nanowires has also been measured using the four‐probe method, and an increase by ∼150 times was found when the sample was taken from the dark and exposed with ∼3 μW μm–2 tungsten light. Since no exotic seeds were involved in this synthetic process, every nanowire (including both ends) should be made entirely of pure selenium, crystallized in the trigonal phase. We believe the protocol described here can be scaled up for the high‐volume production of t‐Se nanowires that can subsequently serve as the physical or chemical templates to generate 1D nanostructures of various kinds of functional materials. The synthetic strategy itself, may also be extendable to other systems containing chain‐like building blocks. The single crystallinity and absence of kinks and other related defects in these nanowires should make them particularly useful in fabricating nanoscale electronic, optical, or mechanical nanodevices.

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Advanced Multimaterial Electronic and Optoelectronic Fibers and Textiles

et al. 2018

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The ability to integrate complex electronic and optoelectronic functionalities within soft and thin fibers is one of today's key advanced manufacturing challenges. Multifunctional and connected fiber devices will be at the heart of the development of smart textiles and wearable devices. These devices also offer novel opportunities for surgical probes and tools, robotics and prostheses, communication systems, and portable energy harvesters. Among the various fiber‐processing methods, the preform‐to‐fiber thermal drawing technique is a very promising process that is used to fabricate multimaterial fibers with complex architectures at micro‐ and nanoscale feature sizes. Recently, a series of scientific and technological breakthroughs have significantly advanced the field of multimaterial fibers, allowing a wider range of functionalities, better performance, and novel applications. Here, these breakthroughs, in the fundamental understanding of the fluid dynamics, rheology, and tailoring of materials microstructures at play in the thermal drawing process, are presented and critically discussed. The impact of these advances on the research landscape in this field and how they offer significant new opportunities for this rapidly growing scientific and technological platform are also discussed.

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Optical properties of selenium sols

Cited by 36 publications

References 27 publications

Structure and spectral-optical characteristics of Se, Se/CdS, and Se/Cd0.5Zn0.5S nanoparticles, stabilized in polymer-containing media

Structure and spectral-optical characteristics of Se, Se/CdS, and Se/Cd0.5Zn0.5S nanoparticles, stabilized in polymer-containing media

Synthesis and Characterization of Uniform Nanowires of Trigonal Selenium

Advanced Multimaterial Electronic and Optoelectronic Fibers and Textiles

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