| Summary: | Due to their unique tubular and spiral structure, graphene and graphene oxide nanoscrolls (GONS) have shown extensive applications in various fields. However, it is still a challenge to improve the optoelectronic application of graphene and GONS because of the zero bandgap of graphene. Herein, ammonium tetrathiomolybdate ((NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub>) was firstly wrapped into the ((NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub>@GONS) by molecular combing the mixture of (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub> and GO solution on hydrophobic substrate. After thermal annealing, the (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub> and GO were converted to MoS<sub>2</sub> nanosheets and reduced GO (RGO) simultaneously, and, thus, the MoS<sub>2</sub>@RGONS was obtained. Raman spectroscopy and high-resolution transmission electron microscopy were used to confirm the formation of MoS<sub>2</sub> nanosheets among the RGONS. The amount of MoS<sub>2</sub> wrapped in RGONS increased with the increasing height of GONS, which is confirmed by the atomic force microscopy and Raman spectroscopy. The as-prepared MoS<sub>2</sub>@RGONS showed much better photoresponse than the RGONS under visible light. The photocurrent-to-dark current ratios of photodetectors based on MoS<sub>2</sub>@RGONS are ~570, 360 and 140 under blue, red and green lasers, respectively, which are 81, 144 and 35 times of the photodetectors based on RGONS. Moreover, the MoS<sub>2</sub>@RGONS-based photodetector exhibited good power-dependent photoresponse. Our work indicates that the MoS<sub>2</sub>@RGONS is expected to be a promising material in the fields of optoelectronic devices and flexible electronics.
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