Fig. 4.

Repeated growth of patterned monolayer MoS₂ nanostructures using the same template. (A) Schematic illustration of repeated growth procedures for directly grown MoS₂ patterns. (B) OM image of monolayer MoS₂ patterns peeled on PDMS. (C) OM image of monolayer MoS₂ structures freestanding on water without any additional support. (D) OM images of the monolayer MoS₂ spiral pattern after the first, second, third, and fourth growth cycles. (E) The carrier concentration mappings (via Raman) of the monolayer MoS₂ spiral after the first, second, third, and fourth growth cycles as given by D. (F) The photoluminescence position mappings (via PL spectrum) of the monolayer MoS₂ spiral after the first, second, third, and fourth growth cycles as given by D.