The kinetics of growth of semiconductor nanocrystals in a hot amphiphile matrix

Dushkin, Ceco D.; Saita, Soichiro; Yoshie, Kenichi; Yamaguchi, Yoshiko

doi:10.1016/s0001-8686(00)00040-3

Cited by 77 publications

(68 citation statements)

References 78 publications

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“…We found that the nanoparticle growth in microemulsion is well described by the twostage theoretical model proven for CdSe nanoparticles in the hot-matrix synthesis [13]. During the fast initial process (Fig.…”

Section: Growth Of Cdse Nanoparticles 331 Time Dependencesupporting

confidence: 54%

“…This formula is devised for CdSe nanocrystals synthesized by pyrolysis in a hot-amphiphile matrix. Although these conditions are rather different from the microemulsion synthesis utilized here, the formula gives plausible results for the nanoparticle diameters that are comparable with those calculated from the absorption peak using the attenuated quantum confinement model [13,19]. The dispersion of size distribution was calculated from the experimental data for the absorbance as described in ref.…”

Section: Methodsmentioning

confidence: 83%

“…The dispersion of size distribution was calculated from the experimental data for the absorbance as described in ref. [13]. For comparison, the CdSe nanoparticle size was also determined from photographs taken by the Hitachi 7500 Transmission Electron Microscope (TEM).…”

Section: Methodsmentioning

confidence: 99%

“…The main advantage of the hot-matrix method is the superior crystallinity and monodisperse size distribution of the semiconductor nanoparticles. The kinetics of nanocrystal growth is also well understood [13]. However, nothing is known about the types of aggregate formed in the heated matrix;it is likely that they are virtual structures with the amphiphiles engulfing the nanoparticles rather than preexisting aggregates in TOPO.…”

Section: Introductionmentioning

confidence: 99%

“…This enables one to plot the particle diameter as a function of time and to fit it using the two-stage growth model from ref. [13] originally derived for the hotmatrix synthesis. This model also describes the microemulsion synthesis surprisingly well, providing larger time constants and comparable values for other parameters.…”

Section: Introductionmentioning

confidence: 99%

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Growth kinetics of CdSe nanoparticles synthesized in reverse micelles using bis(trimethylsilyl) selenium precursor

Emin¹,

Dushkin

Nakabayashi

et al. 2007

Open Chemistry

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Abstract:We first focus on the kinetics of nanoparticle growth in a microemulsion synthesis of CdSe semiconductor nanocrystals. The process consists of a fast initial stage of typical time constant of the order of 10 3 s followed by a slow stage of time constant of the order of 10 4 s. Growth proceeds similarly to that described for the hot-matrix synthesis of CdSe, underlining the generality of the twostage growth mechanism, irrespective of the matrix type and synthesis conditions. However, the time constant of each stage in the microemulsion synthesis is much larger than in the hot-matrix one. Also, the ratio between the fast and slow time constant is appreciably bigger. We also prove that larger size reverse micelles, obtained by increasing the water:surfactant ratio, generally lead to larger CdSe nanoparticles. Bis(trimethylsilyl) selenium is the crucial precursor for the CdSe nanoparticle synthesis. An intermediate stage of the chemical reaction limiting the bis(trimethylsilyl) selenium production is described theoretically.

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Section: Growth Of Cdse Nanoparticles 331 Time Dependencesupporting

confidence: 54%

Section: Methodsmentioning

confidence: 83%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Growth kinetics of CdSe nanoparticles synthesized in reverse micelles using bis(trimethylsilyl) selenium precursor

Emin¹,

Dushkin

Nakabayashi

et al. 2007

Open Chemistry

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Synthesis of Nanofluids

Das

Choi

et al. 2007

Nanofluids

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In this chapter we are concerned with the synthesis of a diverse variety of nanofluids. As this book is concerned with nanofluids designed for specific applications, we limit our discussion to stable nanofluids and free-standing nanosystems which may be made in the form of fluids. Although the first category of fluids may not be separable into the constituent phases (i.e., solid and liquid), the other is in the separated phases to begin with. Nanoparticles formed in porous media such as zeolites, and embedded particles in glasses are not dealt with, although in a larger sense, particles in solids may be considered as solutions.From a general perspective, a two-phase colloidal system can be classified in terms of a dispersed phase and a dispersion medium. The dispersed phase and dispersion medium can be any one of the three phases (i.e., gas, liquid, or solid) except that the first category (i.e., gas in gas) is unknown. From this, a solid nanoparticle dispersed in an amorphous solid may be considered as a colloidal system and consequently, a nanofluid. In our descriptions, fluids will be liquids at ordinary conditions of temperature and pressure, and for that reason, supercritical fluids and gases as the dispersion phase are not considered. It may be noted that the synthesis of nanoparticles in these media (i.e., solid matrices 1 and supercritical fluids 2 ) is a large and advanced area of science. From a historical perspective, it is also important to remember that some of the early applications of nanoparticles were in the form of embedded particles in glasses. 3 Supercritical fluids are a recent area of development in nanoparticle science. GENERAL ISSUES OF CONCERNThere are several factors of interest when considering a given synthetic approach:(1) thermal stability, (2) dispersability in diverse media, and (3) chemical compatibility and ease of chemical manipulation. Each of these parameters is discussed in some detail below. It should be noted that several are intimately connected to each other.

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