Fine Zn Research Articles

Raman scattering from surface phonons in fine Zn particles coated with ZnO

Using a gas-evaporation technique with an induction-heating method, Zn fine particles were prepared. Transmission electron microscopic observations showed that Zn with spherical form are about 80 nm in diameter. X-ray diffraction revealed that the particle is composed of a Zn core and a ZnO coating. Raman scattering from the Zn fine spherical particles coated with ZnO of variable thickness was measured, and a broad peak was observed. The Raman peak shifts to the lower-frequency side with the increase of oxide thickness. To explain the experimental results, the frequencies of the optical-surface phonons of a metallic sphere with a dielectric coating were derived. In particular, the dependence of the frequencies on the thickness of the coating was investigated. From a comparison of experimental results with theoretical analysis, it was concluded that the broad Raman peak comes from the surface-phonon scattering.

Raman Scattering from Fine Zn Particles Coated with ZnO

Raman scattering from Zn fine spheric particles coated with ZnO of variable thickness is measured, and a broad line can be found. The Raman line shifts to lower frequency side with the increase of oxide thickness. A theoretical analysis based on the existence of surface phonon mode has been made. Agreement between experiment and theory is good.

Two-dimensionally oriented organic molecules as a substrate for vapor growth of zinc thin films

Zinc metal was vacuum deposited at room temperature onto cadmium stearate Langmuir-Blodgett (LB) films with surfaces of either hydrophilic head groups or hydrophobic tail groups. Different growth modes on different surfaces of the LB films were observed with an atomic force microscope (AFM). Fine Zn particles deposited onto the hydrophobic surface were uniform and similar in shape irrespective of the deposition rate. However, on the hydrophilic surface, triangular and/or quasi-hexagonal Zn crystals were observed when the deposition rate was very low. Chemical interaction between organic functional groups and deposited metal seems critical for the manner of growth. The possibility of control of the architecture over inorganic crystallization using two-dimensionally oriented organic surfaces is proposed.

VLS（気相-液相-固相）成長したCdおよびZn微結晶の均質核生成

VLS（気相-液相-固相）成長したCdおよびZn微結晶の均質核生成