Plasmon excitations in two-dimensional binary silicon carbide (SiC) nanostructures are investigated with time-dependent density functional theory. SiC nanostructures have two plasmon resonance bands. Compared with silicene nanostructures and graphene nanostructures, due to change of bond length, two plasmon resonance bands of SiC nanostructures are blue-shifted and red-shifted, respectively. Plasmon resonance excitations of one kind SiC nanostructures depend on edge configuration and nanostructure morphology. However, for another kind of SiC nanostructure, dependence on edge configuration and nanostructure morphology decreases. Plasmon resonance properties of this kind SiC nanostructure are basically the same for impulse excitation polarized in different directions.

Plasmon excitation in small sodium clusters with triangle structure is studied with time-dependent density functional theory. For relatively larger sodium clusters,along triangle bottom edge and perpendicular bisector of triangle bottom edge,linear shapes of absorption spectra and resonance energies of main absorption peaks are same. However,along these directions,resonance modes of main absorption peaks are different. For the main plasmon mode,field enhancement extrema are located in region of endpoints of the triangle.

Complex microstructures assembled with ABC amphiphilic nanoperticle-coil macromolecules are investigated with an extending serfconsistent field theory (SCFT) and density functional theory (DFT). The tail of macromolecule is an AB dibiock copolymer, and the attached "head" is a nanoparticle in dilute solution. Serf-assembly morphologies of ABC "tadpole" are different from aggregate morphologies of linear ABC triblock copolymers. As nanoparticle is hydrophilic, spherelike micelles are observed in a weak segregation state. While interaction between different species of "tadpole" increases to a strong segregation state, aggregate morphologies of tadpole transform from spherelike micelles to quadrangle or triangle micelles with increasing of hydrophobic property of blocks A and B. In this case, block B is distributed in corners of quadrangle or triangle micelles. As block A is hydrophilic, hydrophobic nanoparticle assembles into parallel rods or squares in spherelike micelles.