Highly dispersible diamond nanoparticles for pretreatment of diamond films on Si substrate

摘要

Highlights•Highly dispersible diamond nanoparticles by polyglycerol grafting were prepared.•The dispersibility of diamond nanoparticles in organic solvents was observed by TEM.•Diamond films were deposited on Si substrates spin-coated with ND-PG dispersion.•Using ND-PG pretreatment increases nucleation density and growth rate of films.•An improvement of film crystalline quality was achieved simultaneously.AbstractHigh quality diamond film on Si substrate was synthesized by coating diamond nanoparticles prepared by polyglycerol grafting (ND-PG) dispersion as pre-treatment method. Transmission electron microscope indicates that ND-PG is much more dispersible than untreated nanoparticles in organic solvents. The surface morphology was characterized by scanning electron microscope while atomic force microscope was conducted to measure the surface roughness. Microstructure properties were carried out by Raman spectroscopy and X-ray diffraction. The results revealed an increase in nucleation density, an acceleration of growth rate and an improvement of film crystalline quality by using spin-coating ND-PG pretreatment.