Strain relaxation in monolayer MoS over flexible substrate.

In this communication, we demonstrate uniaxial strain relaxation in monolayer (1L) MoS transpires through cracks in both single and double-grain flakes. Chemical vapour deposition (CVD) grown 1L MoS has been transferred onto polyethylene terephthalate (PET) and poly(dimethylsiloxane) (PDMS) substrates for low (∼1%) and high (1-6%) strain measurements. Both Raman and photoluminescence (PL) spectroscopy revealed strain relaxation cracks in the strain regime of 4-6%.