Preparation of Size-Controlled CdS Colloids in Water and Their Optical Properties

Nosaka, Yoshio; Yamaguchi, Katsuhiko; Miyama, Hajime; Hayashi, H.

doi:10.1246/cl.1988.605

Cited by 103 publications

(45 citation statements)

References 16 publications

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“…As mentioned above, optical constants of nanoparticles can differ from those of the bulk material and in addition depend on the particle size [39][40][41][42][69][70][71][72][73][74][75][76] , which will be evident below with the example of the refractive index. However, the most striking demonstration of related phenomena is probably, as indicated in the preceding section, the color dependence of nanoparticles on the particle size.…”

Section: Influence Of the Particle Size On Optical Properties Of Nanomentioning

confidence: 99%

Nanocomposites of polymers and metals or semiconductors: Historical background and optical properties

Caseri¹

2000

Macromol. Rapid Commun.

536

335

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Upon transmission of visible light through composites comprising of a transparent polymer matrix with embedded particles, the intensity loss by scattering is substantially reduced for particle diameters below 50–100 nm (nanoparticles, nanosized particles). As a consequence, related materials (nanocomposites) have found particular interest in optical studies. The first part of this article deals with a historical survey on nanoparticles and nanocomposites and the importance of small particle sizes on their optical properties. The second part focuses on results from our laboratory concerning nanocomposites with extremely high or low refractive indices and dichroic nanocomposites and their application in bicolored liquid crystal displays (LCD). The inorganic colloids required for these studies (lead sulfide, iron sulfides, gold, and silver) were prepared in situ in presence of a polymer or isolated as redispersable metal colloids modified at the surface with a self‐assembled monolayer (SAM) of an alkanethiol. The nanocomposites themselves were finally obtained by coprecipitation, spin coating, solvent casting or melt extrusion, with poly(ethylene oxide), gelatin, poly(vinyl alcohol) and polyethylene as matrix polymers.

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Section: Influence Of the Particle Size On Optical Properties Of Nanomentioning

confidence: 99%

Nanocomposites of polymers and metals or semiconductors: Historical background and optical properties

Caseri¹

2000

Macromol. Rapid Commun.

536

335

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“…Preparation of the colloidal particles was carried as reported in the literature [14,15]. Colloidal solutions of CdS capped with 3-mercaptopropane diol (3-MPD) were prepared by injecting Na 2 S into de-aerated solutions containing CdClO 4 , hexametaphosphate (HMP) and 3-MPD.…”

Section: Methodsmentioning

confidence: 99%

“…The use of thiols as capping agents to control cluster size is well known [14,15]. The advantage of a functionalized surface is that it enables to localize electrons at the particle surface.…”

Section: Introductionmentioning

confidence: 99%

Detection of shallow electron traps in quantum-sized CdS particles using dithiolenes

Jacob

Biswas

Mukherjee

et al. 2008

Res. Chem. Intermed.

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Abstract-Photophysical characteristics of capped and uncapped CdS particles have been investigated in aqueous solution. It is seen that the fluorescence spectrum shifts towards lower energies in the presence of toluene dithiol (TDT) and dimercaptophthalic acid (DMPA). This shift, which is due to quenching of shallow traps, is more predominant with TDT. Also, the presence of excess Cd 2+ ions at the surface of the CdS particles facilitates the binding of dithiolenes.

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“…In the first set (Method A), a known amount of MEA was added to the Cd 2 + solution before its exposure tõ S. This method was similar to the one employed by other researchers [6][7][8][9][10][11][12] in controlling the size of CdS colloids.…”

Section: Control Of Cds Particle Size With Meamentioning

confidence: 99%

Surface Modification of CdS Colloids with Mercaptoethylamine

Kamat

Wijngaarden

Hotchandani

1993

Israel Journal of Chemistry

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Abstract. Surface modification as well as size control ofCdS colloids in acetonitrile has been achieved with mercaptoethylamine (MEA). The CdS emission yield increases as it interacts with the surface modifier. A decrease in the hole-trapping yield was observed in optically excited CdS colloids wbich were modified with MEA. Use of such surface modifiers in bridging a semiconductor colloid with a gold colloid has also been demonstrated.

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Preparation of Size-Controlled CdS Colloids in Water and Their Optical Properties

Abstract: Size of colloidal CdS particles in aqueous medium was controlled by adding thiols in the procedure of the preparation. The change in optical absorption spectra and the quantum yield of photoinduced electron transfer were measured for these size-controlled CdS colloids.

Cited by 103 publications

References 16 publications

Nanocomposites of polymers and metals or semiconductors: Historical background and optical properties

Nanocomposites of polymers and metals or semiconductors: Historical background and optical properties

Detection of shallow electron traps in quantum-sized CdS particles using dithiolenes

Surface Modification of CdS Colloids with Mercaptoethylamine

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