Growth kinetics of CdSe nanoparticles in glass

Abstract

The growth of CdS 0.08 Se 0.92 nanoparticles in glass is studied through the analysis of optical absorption spectra with the help of a quantized-state effectivemass model in which the conduction band effective mass is particle size dependent. The glass includes nanoparticles with an initial average size of ∼1.4 nm on cooling down to room temperature from the melt at ∼1000 • C. Particles grow by diffusion of the reactants onto the surface of initially formed nuclei upon heat treatment between 575 and 675 • C. Combined use of Arrhenius plots and the model yields an activation energy of ∼500 kJ mol −1 .

Solid‐phase precipitation of CdTe nanoparticles in glass

“…The evolution of the absorption edge spectra over time is consistent with heterogeneous nucleation of nanoparticles, followed by diffusive growth. The time rate at which the absorption peak position moves to lower energies, i.e., = / E t~0.25 eV h -1 at 625 °C compares well with the previously reported rate of ~0.33 eV h -1 at 625 °C for the growth of CdS 0.5 Se 0.5 particles [9] and ~0.41 eV h -1 at 625 °C for the growth of CdS 0.08 Se 0.92 particles [10] in glass, which undergo heterogeneous nucleation. In diffusionlimited growth of the particles, all nuclei are assumed to be extrinsic and created at t = 0 prior to the heat treatment during quenching the melt to room temperature.…”

“…The present work follows previous work in Cd 1-x Zn x S and CdS x Se 1-x by Yükselici [9,10]. We employed optical absorption spectroscopy to study the growth kinetics of CdTe nanoparticles in glass.…”

Thermal treatment-dependent chemical composition of ternary CdS1−xSex nanocrystals grown in borosilicate glass

“…Diffusion-limited growth in a glass matrix is a well elaborated technique for obtaining II-VI semiconductor nanocrystals, with the growth process basically consisting of three stagesnucleation, normal growth, and coalescence (Ostwald ripening or competitive growth) [1][2][3][4][5][6][7][8]. The near-spherical shape of thus grown nanocrystals is evidenced by transmission electron microscopy (TEM) [1][2][3]9].…”

“…The near-spherical shape of thus grown nanocrystals is evidenced by transmission electron microscopy (TEM) [1][2][3]9]. Their average size can be evaluated from TEM [1][2][3]9], small-angle X-ray scattering [5,9,10], low-frequency Raman scattering [10,11], and optical absorption [7,8,[12][13][14] and is known to increase with the thermal treatment duration and/or temperature.…”

Movable Au microplates as fluorescence enhancing substrates for live cells

“…As seen in Fig. 4(g), the area of the triangular plate increased linearly with the time of thermolysis, implying that the growth is diffusion limited [21]. The slope may depend on the local concentration of the precursor and the temperature, among other conditions.…”