Recently, with the development of nanotechnology, it has become possible to change the size and the shape of nanoparticles, so a lot of investigations are being conducted into the optical properties of various shaped nanogold and semiconductor quantum dots. The properties are affected by their associate structure and a core-shell structure has been the main focus of most investigations. However, the optical property of a semiconductor quantum dot aqueous solution that contains nanogold has not been discussed.
While Discrete Dipole Approximation(DDA) and Finite Difference Time Domain(FDTD) methods are widely used in the optical property simulation of nanoparticles, Mie theory is employed in the simulation of the scattering property of various shaped nanoparticles.
Ri Myong Il, a researcher at the Faculty of Physical Engineering, has chemically prepared an aqueous solution of CdTe quantum dots with gold nanoparticles and measured its absorption and scattering spectra. On the basis of it, he has simulated the scattering property of this composite material by combining Mie theory with FDTD method.
The aqueous solution of CdTe quantum dots (3nm in diameter) with gold nanoparticles (30nm in diameter) was prepared by the chemical crystal growth method. The scattering property of the aqueous solution of CdTe quantum dots with gold nanoparticles was simulated by the Finite Difference Time Domain (FDTD) method and it was verified by an absorption spectrophotometer.The results showed that compared with a pure aqueous solution of CdTe quantum dots, it has stronger absorption and scattering spectra, that is, 1.5 times higher in scattering intensity. Therefore, it is concluded that aqueous solutions of CdTe quantum dots with gold nanoparticles can be widlely used in the fields of medicine and optics.
More information can be found in his paper “Scattering Property of Aqueous Solution of CdTe Quantum dots with Gold Nanoparticles” presented to the SCI Journal “Optics Communications”.