| Summary: | Monolayer MoS<sub>2</sub> has attracted tremendous interest, in recent years, due to its novel physical properties and applications in optoelectronic and photonic devices. However, the nature of the atomic-thin thickness of monolayer MoS<sub>2</sub> limits its optical absorption and emission, thereby hindering its optoelectronic applications. Hybridizing MoS<sub>2</sub> by plasmonic nanostructures is a critical route to enhance its photoluminescence. In this work, the hybrid nanostructure has been proposed by transferring the monolayer MoS<sub>2</sub> onto the surface of 10-nm-wide gold nanogap arrays fabricated using the shadow deposition method. By taking advantage of the localized surface plasmon resonance arising in the nanogaps, a photoluminescence enhancement of ~20-fold was achieved through adjusting the length of nanogaps. Our results demonstrate the feasibility of a giant photoluminescence enhancement for this hybrid of MoS<sub>2</sub>/10-nm nanogap arrays, promising its further applications in photodetectors, sensors, and emitters.
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