Formation of needle-like CdS nanoparticles on DNA template

Monolayer of octadecylamine(ODA) and salmon sperm DNA or salmon sperm DNA-C d complex were studied on air-water interface by pi-A isotherm. After being co-transferred onto substrates by Langmuir-Blodgett technique, atomic forc e microscope(AFM) measurements show the DNA molecules are packed into lines in the film, due to the interactions between the ODA and DNA molecules, By exposing the ODA and DNA-Cd complex LB film to H2S, needle-like CdS nanopa rticles were formed along the DNA lines as characterized by transmission el ectron microscope(TEM), Electron diffraction(ED) image indicates that the s o prepared needle-like CdS is a new kind of nanostructured materials.