Synthesis of single layer MOS2 array for surface Raman enhancement spectroscopy

We present direct synthesis of high quality single-layer MoS
₂
array on substrates with pre-deposited sulfur seeds for the first time with strong Raman signals of diluted Rhodamine 6G (R6G) due to Surface-Enhanced Raman Scattering (SERS). This work has following unprecedented accomplishments: (1) the usages of sulfur terminated substrate for the synthesis of CVD MoS
₂
array; (2) SERS using the monolayer MoS
₂
array with partially bowtie structures. (3) First time demonstration of SERS and photoluminescence (PL) on MoS
₂
covered with Al
₂
O
₃
, which address the possibility of the physical enhancement mechanism. As such, the newly developed processes can enable large scale growth of MoS
₂
for applications in bio-chemical sensing, and bring great inspiration in the 2D chalcogenide SERS mechanism.