Gas Composition Influence on the Properties of Boron-Doped Diamond Films Deposited on the Fused Silica

Abstract

The main subject of this study are molecular structures and optical properties of boron-doped diamond films with [B]/[C]ppm ratio between 1000 and 10 000, fabricated in two molar ratios of CH4-H2mixture (1 % and 4 %). Boron-doped diamond (BDD) film on the fused silica was presented as a conductive coating for optical and electronic purposes. The scanning electron microscopy images showed homogenous and polycrystalline surface morphology. The Raman spectroscopy confirmed the growth of sp3diamond phase and sp2carbon phase, both regular and amorphous, on the grain boundaries, as well as the efficiency of boron doping. The sp3/sp2ratio was calculated using the Raman spectra deconvolution method. A high refractive index (in a range of 2.0 to 2.4 at λ= 550 nm) was achieved for BDD films deposited at 700 °C. The values of extinction coefficient were below 1.4 at λ= 550 nm, indicating low absorption of the film

Real-Time Detection of Hydroxyl Radical Generated at Operating Electrodes via Redox-Active Adduct Formation Using Scanning Electrochemical Microscopy

“…The wavelengths were calibrated using a Ne lamp source. The characteristics peaks for boron-doping effect at 500 and 1200 cm –1 in a mixture of Boron-doping effect/D Peak, sp 3 Diamond peak was detected at 1332 cm –1 , sp 2 Graphitic Peak was observed at 1332 cm –1 , and 2D Peaks were identified at 2500 cm –1 . Atomic force microscopy imaging of the electrode in tapping mode is shown in Figure S14.…”

“…The computed APR values are referenced to the standard hydrogen electrode (SHE) and subsequently referenced to the silver chloride reference electrode (Ag|AgCl). We applied two commonly used SHE reference potentials of 4.28 V and 4.44 V (IUPAC). − In addition to different methods for redox potential prediction, we also employed two different solvation methods to determine the optimum E ° prediction: (1) Polarizable Continuum Model (PCM) using the integral equation formalism variant (IEF-PCM); (2) Solvation Model based on Density (SMD) …”

Doped Nanocrystalline Diamond Films as Reflective Layers for Fiber-Optic Sensors of Refractive Index of Liquids

“…A special truncated cone-shaped shim and 500 °C was used during the growth of BD-NCD films. The plasma microwave power, optimized for diamond synthesis, was kept at 1300 W [21]. In this study, the molar ratio of the CH 4 :H 2 mixture was kept at 1% of gas volume at 300 sccm of the total flow rate.…”