Ultrathin two-dimensional WSe2 has attracted huge attention due to its potential applications in future wearable electronics. Here, we demonstrate the flexible and high-performance photodetector using high-yield sonochemical exfoliation technique. An efficient and low cost fabrication strategy using Whatman filter paper is adopted for the first time for fabrication of a photodetector based on WSe2 nanodots (NDs). The WSe2 NDs have hexagonal lattice structure with P63/mmc and have indirect band gap of 1.63 eV. The exfoliation and number of layers in WSe2 NDs is confirmed by Raman, absorption, and photoluminescence spectroscopy. Subsequently, the photodetector based on WSe2 NDs is fabricated. The device shows excellent photoresponse with response time of 0.68 s and photoresponsivity of 17.78 mAW–1 and detectivity of 5.86 × 1010 Jones for 5 V. The device is analyzed for bias of 0 to 100 V and responsivity is enhanced up to 796.18 mA W–1 at 100 V bias. Furthermore, the paper-based detector exhibited great flexibility and air stability. The performance of the photodetector was also recorded in the spectral range 390 to 880 nm. Over all, the performance paper-based device advocates a novel pathway for flexible and intelligent electronics.

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Flexible sensors based on two-dimensional layered materials have gained huge attention in the field of intelligent electronics. The cellulose based platform provides a cost-effective way for fabrication of strain or pressure sensing abilities of the sensor. This paper reports a paper based flexible sensor functionalized by 2D-SnSe2 nanosheets for its multifunctional sensing purposes. 2D-SnSe2 nanosheets were synthesized by a high-yield liquid phase exfoliation technique. The multifunctional sensor fabricated using Whatman filter paper was exploited in the pressure range 2 to 100 kPa. The sensor exhibits the excellent stability and reproducibility with high responsivity of 611% and sensitivity of 1.79 kPa–1. The sensor exhibited excellent stability up to 5000 loading cycles. The response time of the pressure sensors is 100 ms, showing optimum sensor structure for future electronics. The sensor shows excellent potential for the online monitoring of a human breath with 3.2–3.5 s/breath. Finally, the paper advocates the great advancement of two-dimensional transition metal dichalcogenides for their applications as high-performance devices.

High-performance electronics demand extremely sensitive piezo-resistive sensors with important features such as low-fabrication cost, easy implementation, low power consumption and high-pressure sensitivity over broad pressure range. Herein, we report a flexible piezo-resistive paper-based device functionalised by WSe 2 nanosheets. An efficient and low-cost fabrication strategy using Whatman filter paper and tissue paper is adopted for versatile sensing applications. The WSe 2 nanosheets were synthesized by high-yield and size-controlled liquid phase exfoliation technique. The flexible WSe 2 nanosheets-paper sensor shows excellent response in broad pressure range of 1 Pa-100 kPa with exceptionally high sensitivity of 29.24 kPa −1 , current responsivity of 70 and response time of 100 ms. The pressure sensor is also employed to recognize the pressure generated due to finger tapping. Encouragingly, the piezo-resistive sensors can also sense extremely small pressure differences of about 1.4 Pa generated by water drops.

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