Abstract
Colloidal suspensions of semiconductor InP@ZnS nanoparticles were prepared using single-step procedure without precursor injection. Thermal properties of toluene containing InP@ZnS semiconductor with different sizes (3.1, 4.2, and 4.6 nm) were measured by mode mismatched dualbeam thermal lens technique. This was done in order to measure the effect of the presence of semiconductor nanoparticles and size on the nanofluids thermal diffusivity. The characteristic time constant of the transient thermal lens was estimated by fitting the experimental data to the theoretical expression for transient thermal lens. The thermal diffusivity of the nanofluids (toluene, containing InP@ZnS semiconductor nanoparticles) it seems to be strongly dependent on the presence of semiconductor nanoparticles and particles size. For the case of nanofluids consisting of InP@ZnS nanoparticles dispersed in toluene, it was observed a decrease in the thermal diffusivity. Such behavior differs from other nanofluids, in the sense that they had shown positive thermal diffusivity enhancement. The minimum diffusivity was achieved for the nanoparticles with lowest size. Plausible explanation for such nanofluids low thermal diffusivity with semiconductor nanoparticles is given. UV-Vis spectroscopy, TEM and high-resolution electron microscopy (HRTEM), and energy dispersive spectroscopy (EDS) techniques were used to characterize the InP@ZnS nanoparticles.
Highlights
After their thermal properties variations were reported at the end of last century [1], nanofluids are new compound liquids that had obtained much interest
transmission electron microscopy (TEM), and high-resolution electron microscopy (HRTEM), energy dispersive spectroscopy (EDS) were used along with optical absorption spectroscopy to study the size, size distribution, composition, and fine structure of semiconductor InP@ZnS colloids formed at different contents of In (MA)
The effects of In (MA) content in the semiconductor InP@ZnS colloidal nanoparticles can be clearly observed in Figure 1, which shows transmission electron micrographs with their corresponding size distribution histograms for each of the samples
Summary
After their thermal properties variations were reported at the end of last century [1], nanofluids are new compound liquids that had obtained much interest. To our knowledge, there is no study on the thermal diffusivity of nanofluids containing InP@ZnS semiconductor nanoparticles. Effect of the presence of semiconductor nanoparticle and size of InP covered with ZnS shell on the thermal diffusivity of nanofluids was studied. Thermal diffusivity measurements are carried out in toluene containing core-InP/shell-ZnS nanoparticles using the Thermal Lens Spectroscopy (TLS) [23]. This technique provides reliable photothermal alternative for measuring thermal diffusivities of semiconductor materials with high sensitivity. We used the mode mismatched dualbeam thermal lens technique to measure the thermal diffusivity of nanofluids
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