Surface engineering (WP2)
Work Package Leader
Objectives of the Work Package
- Maximize the electron emission properties of the diamond materials developed in WP1 by fine control of surface terminations
- Research on suitable conditions for hydrogenation and fluorination of diamond materials
- Hydrogenation and Fluorination of diamond materials optimized in WP1
- Functionalization by transition metal complexes and other catalytically active moieties
Description of the Work Package
WP2 covers the surface preparation of diamond materials towards enhanced photocatalytic activity.
H-terminated and F-terminated diamond will be produced by plasma treatments (validated for planar surfaces and 5 nm na
nodiamond by CEA) and IAF with SF6 plasma) of materials from WP1 for homogenous termination of the whole surface. Optimal conditions will be determined in a Chemical Vapour Deposition (CVD) reactor connected to a Ultra-High Vacuum (UHV) set-up for in-situ monitoring of the surface electronic structure by electron spectroscopies (XPS and UPS), in order to maximize the electron emission properties of the diamond materials.
The conditions of hydrogenation and fluorination will be then reported to specifically designed reactors (CEA, IAF). The surface morphology of diamond materials will also be studied by Scanning Electron Microscopy (SEM), to characterize the surface changes induced by plasma etching.
This specific task will be devoted to the functionalization of the porous and dispersed diamond materials with water oxidation catalysts such as transition metal complexes or nickel or platinum nanoparticles attached to the surface by UWUERZ. This grafting will be checked by Fourier-Transformed Infra-red Spectroscopy (FTIR), Raman spectroscopy, Thermal Gravimetric Analysis (TGA) (UWUERZ) and X-ray Photoemission spectroscopy (XPS) (CEA).