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Schematic of a diamond sample half oxygen-terminated and half-fluorine-terminated. Oxygen-termination is achieved with a boiling triacid clean.
C 1s core-level photoelectron spectra obtained for (a) oxygen- and (b) fluorine-terminated side of the same sample. Circles correspond to the measured values and solid lines to the fitted peaks. Top inset shows elemental composition of the respective termination. Bottom inset zooms into the higher binding energies to show the peaks more clearly.
(a) Representative photoluminescence spectra of the oxygen- and fluorine-terminated side of the sample upon excitation at 532 nm. (b) The ratio of NV− ZPL area to the sum of NV− and NV0 ZPL area of the same sample after 4 subsequent steps: (1) acid cleaned, (2) half protected from (circular markers) and half exposed to (triangular markers) CF4 plasma, (3) left in air for 10 days, and (4) re-oxygenated and cleaned with boiling triacid.
Ratio of NV− ZPL area to the sum of NV− and NV0 ZPL area for hydrogen-, oxygen-, and fluorine-terminated surfaces. Inset: zoom in for O- and F-termination.
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