研究目的
Investigating the possibility of self-assembly of complex nanostructures with pre-defined geometry under the action of laser field.
研究成果
The principal possibility of selective formation of structures with pre-defined geometry from three nanoparticles is demonstrated in the field of laser radiation escaping step-by-step assembly. The probability of formation of pre-defined nanostructures reaches 10-11% during 10 ns laser pulse at the modest external field intensity. The possibility to control the geometry of formed structure by the choice of external field wavelength is also discussed.
研究不足
The complexity of the implementation of step-to step assembly grows essentially with the increase of the number of particles in the structure to be formed.
1：Experimental Design and Method Selection:
The study uses a dynamical model for step-by-step self-assembly of nanoparticles in the field of laser radiation. The model is based on Langevin equations system accounting for Brownian dynamics of an ensemble of particles.
2：Sample Selection and Data Sources:
CdTe quantum dots immersed into water solution are used as samples.
3：List of Experimental Equipment and Materials:
The intensity of laser radiation is chosen to be 10^6 W/cm^2, corresponding to the intensity available by focusing the radiation of commercial Q-switched lasers.
4：Experimental Procedures and Operational Workflow:
The numerical solution of a system of ordinary differential equations was obtained via two-step method of family of explicit numerical Runge-Kutta methods. Calculation of particles motion was performed within a spherical cell initially filled by N arbitrarily distributed particles.
5：Data Analysis Methods:
The geometry of formed structure was controlled by the frequency and orientation of polarization vector of external field. The probability of structure formation with certain geometry is estimated statistically from large number of identical calculations.
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