A near edge X-ray absorption fine structure study of oxidized single crystal and polycrystalline diamond surfaces

作者：Shpilman Z; Gouzman I^*; Minton T K; Shen L; Stacey A; Orwa J; Prawer S; Cowie B C C; Hoffman A

来源：Diamond and Related Materials, 2014, 45: 20-27.

DOI：10.1016/j.diamond.2014.03.004

• Diamond
• NEXAFS
• Atomic oxygen

The influence of oxidizing environments on single crystal diamond and polycrystalline chemical vapor deposited CVD diamond films was studied using the near edge X-ray absorption fine structure (NEXAFS) pre-edge region in both bulk and surface sensitive modes. The NEXAFS of (100) oriented single crystal diamond was measured following (i) exposure to a microwave (MW) hydrogen plasma, (ii) annealing to 1000 degrees C, (iii) exposure of the as annealed surface to H2O, and (iv) exposure of the as annealed surface to O-2. From these measurements particular surface bonding configurations have been assigned to features in the pre-edge structure. The NEXAFS of microcrystalline CVD diamond films was studied following different oxidative treatments using (i) a thermal atomic oxygen (AO) environment, (ii) a hyperthermal (5 eV) AO source, and (iii) an RF oxygen plasma exposure. The nature of the surface layer was found to be different for differently oxidized surfaces. These treatments were carried out as part of a study of CVD diamond durability in the low Earth orbit space environment.

• 出版日期2014-5