Tailoring optical emission of silicon-vacancy centers in two-dimensional diamond nanosheets via a two-step oxidation approach

Incorporating two-dimensional (2D) diamond nanosheets with fluorescent color centers exhibits great potential in the application of quantum sensing. However, always show poor optical emission chemical-vapor-deposited (CVD) nanomaterials. To address this issue, Si doped diamond/graphite hybrid films were successfully fabricated microwave-plasma CVD device. The consist diamond-core/graphite-shell high amount nanocrystalline particles. Two post treatments acid oxidation and annealing air used to tailor photoluminescence (PL) silicon-vacancy (SiV) centers. SiV oxidized samples exhibit small PL increase compared as-deposited quenching. It is found that graphite phase selectively etched away presence particles during treatment while are efficiently removed using method. Based on result, a two-step approach followed by was conducted etch non-diamond phase, forming nanosheets. significant enhancement maximum value 28 folds, single-step samples. Raman XPS results reveal such originates from direct bonding oxygen sp3 carbon. Therefore, our work provides feasible prepare 2D high-brightness