In order to enhance the responsivity, response speed and response spectral range of 2-D MoS₂ photodetectors, high-quality multilayer MoS₂ nanosheets were prepared by inserting tetrahexyl ammonium chloride (THA ⁺) into bulks MoS₂ through an electrochemical workstation and ultrasound-assisted exfoliation process. Thereafter, the MoS₂ photodetectors were prepared by the spin-coating the prepared MoS₂ nanosheets on the substate. Subsequently, the detector was modified by the Au nanorods (Au NRs) with double plasmon modes to further enhance the interaction between the photo sensing layer and the incident light. Experimental results show that the responsivity of the MoS₂/Au NRs photodetector is improved from 2.4×10^-3 A/W to 0.484 A/W, and the response time is boosted from 50 ms to 20 ms. In summary, this work not only provides a facile and effective method to expandthe detectable spectral range of the photo detector, but also improve the performance of the photo detector.