  Nuclear magnetic resonance (NMR) schemes can be applied to micron-, and
nanometer-sized samples by the aid of quantum sensors such as nitrogen-vacancy
(NV) color centers in diamond. These minute devices allow for magnetometry of
nuclear spin ensembles with high spatial and frequency resolution at ambient
conditions, thus having a clear impact in different areas such as chemistry,
biology, medicine, and material sciences. In practice, NV quantum sensors are
driven by microwave (MW) control fields with a twofold objective: On the one
hand, MW fields bridge the energy gap between NV and nearby nuclei which
enables a coherent and selective coupling among them while, on the other hand,
MW fields remove environmental noise on the NV leading to enhanced
interrogation time. In this work we review distinct MW radiation patterns, or
dynamical decoupling techniques, for nanoscale NMR applications.
