Although a variety of MoS 2 -based photodetectors have been reported over the last few years, the controlled fabrication of large-area photodetector array for photoimaging remains a major challenge due to the low yield and poor quality of MoS 2 film. Herein, a high-performance inkjet-printed flexible photodetector array based on stacked MoS 2 nanosheets is demonstrated for the first time. The 2H phase MoS 2 nanosheets is obtained by intercalating quaternary ammonium cation into MoS 2 bulk. The inkjet-printed photodetector achieves excellent performance with a highest responsivity of 552.5 A W À1 , detectivity of 1.19 Â 10 12 Jones, and fast response and recovery time of 23 and 26 ms, respectively, at room temperature. Furthermore, a photodetector array with 85 pixels per inch is successfully constructed, and the letter of "T" is clearly recognized. These results indicate that electrochemical exfoliation coupled with inkjet printing has great prospect for application in high-performance photodetector array. Besides, the electrochemical exfoliation is also successfully applied to obtain the ink of In 2 Se 3 , black phosphorus (BP), and MoTe 2 . It is believed that this work paves the way for various potential printable optoelectronics based on 2D materials.

Despite the widespread interest in MoS 2 -based photodetectors over the past few years, use of a high-performance photoimaging device remains a major challenge due to the low yield and poor quality of the MoS 2 film. In this paper, we demonstrate a simple method to fabricate a high-performance fully integrated photodetector array based on a large-area atomically thin MoS 2 film for photoimaging. Here, the film is constructed by spin-coating of the MoS 2 nanosheets, which are acquired via electrochemical intercalation and sonicationassisted exfoliation. By precisely controlling this process, semiconducting fewlayered MoS 2 nanosheets with pure phase can be obtained. High-performance photodetectors have been achieved for the TFSI-treated MoS 2 film, as the responsivity reaches 1080 A/W, and the response/recovery time improved to 56/ 62 ms with high stability during the repeated on/off test. The overall performance is much better than that of previously reported photodetectors based on liquidexfoliated MoS 2 nanosheets. Furthermore, a fully integrated photoimaging device with a crossing structure and an effective pixel density of 460/cm 2 has been fabricated based on the MoS 2 film, and shows great potential for shape imaging with cross-talk suppression. We believe this work provides an approach to exploit the photodetector and image sensor based on layered materials.

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The color of samples changed after illumination in the light from a high pressure mercury lamp, when depositing WO3 thin film on polyester fabrics by magnetron sputtering. indicate that the fabric has discolour properties. Placed in dark room for some time, the samples recovered to pre-illumination color, show that the reaction is photochromic.

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