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.
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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