Nanopore/Nanosphere‐Induced Optical Enhancement of Monolayer MoS2

Heterostructured transition metal dichalcogenides (TMDs) have received much attention due to their tunable optical and electronic properties. Here, a strategy for facile fabrication of porous anodic alumina (PAA) membrane‐supported monolayer molybdenum disulfide (MoS2) is described. PAA is either empty or filled with gold nanoparticles (AuNPs). Such nanopore/nanosphere‐supported MoS2 (i.e., PAA‐MoS2 and PAA‐Au‐MoS2) exhibits greatly enhanced optical performances compared with those of silicon wafer‐supported MoS2 (i.e., Si/SiO2‐MoS2). Notably, 11‐fold Raman enhancement, 13‐fold photoluminescence enhancement, and 419‐fold second‐harmonic generation enhancement are achieved in PAA‐Au‐MoS2. Moreover, the optical enhancement mechanism of this unique structure is proposed. This work provides a platform for the construction of curved/heterostructured TMDs and exploration of their strong light‐matter interactions. Porous anodic alumina (PAA) membrane is used to support monolayer molybdenum disulfide (MoS2). Either empty or filled (with gold nanoparticles) PAA can be applied as the substrate. Remarkable optical (e.g., Raman, photoluminescence, and second‐harmonic generation) enhancement is observed in nanopore/nanosphere‐supported MoS2 compared with silicon wafer‐supported MoS2.