Optical properties of diamond films grown by MPCVD method with alternating nanodiamond injection

Abstract

Transparent polycrystalline diamond films with grain size ranging from a few tens to hundreds of nanometres were prepared on fused silica substrate by Microwave Chemical Plasma Vapour Deposition method (MPCVD). The new technique, called alternating nanodiamonds injection, was applied for substrate pretreatment. It was demonstrated that nanodiamonds injected on fused silica substrate serve as nucleation centres and make possible an increase in nucleation density to 10 10 cm -2 . The influence of MPCVD parameters such as methane concentration, total pressure and substrate temperature on the crystalline structure and optical properties of diamond films were investigated by using microRaman spectroscopy and scanning electron microscopy, transmittance and reflectance measurements in the wavelength range of 400-1000 nm. Under appropriate MPCVD parameters, diamond films with optical transmission ~70% from 650 to 1000 nm and high content of diamond phase were fabricated.

Polycrystalline diamond on self-assembled detonation nanodiamond: a viable route for fabrication of all-diamond preformed microcomponents

“…The coatings are characterized by high phase purity, as indicated by the Raman spectrum reported in figure 3 (curve (a)). The present results matches with the findings of the experiments performed using DN sprayed on various substrates as seeding for diamond film growth [10,12,15,16]. Curve (b) in figure 3(b) is, for comparison, the typical spectrum taken from a DN assembly.…”

“…In contrast to experiments where nanodiamond grains dispersed on a substrate are used as seeds for nucleation of polycrystalline diamond [9][10][11][12][13][14] or injected during the microwave-activated CVD growth [15][16][17], we employed 3D structures formed by self-assembled close-packed nanocrystalline diamond as templates for CVD-grown layers. This technique allows far greater control over the shape of the final diamond samples.…”

Low-strain heteroepitaxial nanodiamonds: fabrication and photoluminescence of silicon-vacancy colour centres

“…The reflectivity from a substrate with diamond particles was measured in situ in the course of the CVD growth and RIE [35] at a wavelength of 670 nm at a light incidence angle of 60°. Micrographs of the particles were obtained by scanning electron microscopy (SEM) on a Merlin electron microscope (Carl Zeiss, Germany).…”

New prospects and frontiers of nanodiamond clusters

“…ND particle injection from a suspension can be combined in the same technological cycle with diamond film growth by microwave plasma chemical vapour deposition (MPCVD) [62,63]. The breakup of injected nanodiamond aggregates into particles of about 100 nm in size when they hit the substrate provides a nucleation density of over 10 10 cm 2 .…”