  We report the fully-scalable fabrication of a large array of hybrid
molybdenum disulfide (MoS$_2$) - silicon dioxide (SiO$_2$) one-dimensional,
free-standing photonic-crystal cavities capable of enhancement of the MoS$_2$
photoluminescence at the narrow cavity resonance. We demonstrate continuous
tunability of the cavity resonance wavelength across the entire emission band
of MoS$_2$ simply by variation of the photonic crystal periodicity. Device
fabrication started by substrate-scale growth of MoS$_2$ using chemical vapor
deposition (CVD) on non-birefringent thermal oxide on a silicon wafer; it was
followed by lithographic fabrication of a photon crystal nanocavity array on
the same substrate at more than 50% yield of functional devices. Our cavities
exhibit three dominant modes with measured linewidths less than 0.2 nm,
corresponding to quality factors exceeding 4000. All experimental findings are
found to be in excellent agreement with finite difference time domain
simulations.
