Flexible broadband photodetectors are desired but challenging to be fabricated for next-generation wearable intelligent optoelectronic devices. Considering the narrow bandgap and strong light absorption, molybdenum telluride (MoTe 2 ) based photoelectrochemical photodetectors are successfully assembled by liquid phase exfoliation accompanied with the electrophoretic deposited method. This MoTe 2 -based photodetector shows a broadband detection in ultraviolet–near-infrared band, long-term stability within 18000 s, and fast response in millisecond-level (response time≈19 ms, recovery time≈26 ms). More importantly, even though the MoTe 2 photodetector is bent and twisted at a high degree for several hundred times, it still shows excellent flexibility with stable on-off switching characteristics. Additionally, this photodetector displays a good response for rotation angles in the range from 0° to 360°, and the extracted I ph maintain almost the same value approximately 0.97 µA cm −2 , suggesting an omnidirectional detection capability. This work demonstrates the proposed flexible photoanode shows a great potential in future broadband omnidirectional detection systems.
Developing flexible and binder-free electrodes with superior electrochemical performance is the critical key for flexible electronics and wearable devices . MoTe 2 , a typical two-dimensional (2D) layered material, has emerged as an attractive anode material for sodium ion batteries (SIBs) because its abundant active sites and rapid Na + transfer and storage. In this work, a series of flexible MoTe 2 /C nanofibers (NFs) are successfully synthesized via a facile electrospinning process with tellurization treatment. As binder and current collector-free anodes, the optimized MoTe 2 /C-600 shows significantly enhanced Na + storage performance, which delivers a high reversible capacity of 294 mAh g −1 after 100 cycles at 0.1 A g −1 and an ultra-long time cycling performance of 5000 cycles at 1.0 A g −1 . The as-prepared MoTe 2 /C NFs possess double merits of well 1D conductive paths and 3D ion diffusion channels, which effectively boost the electron/Na + transfer. Meanwhile, its excellent flexibility and mechanical strength greatly enhance the cycling stability. More importantly, in-situ X-ray diffraction and ex-situ transmission electron microscope were employed to demonstrate its structure evolution, revealing that the high capacity of MoTe 2 /C-600 results from the cooperation of Na + intercalation and conversion reaction. The findings of this study provide a better understanding on the sodium storage mechanism of MoTe 2 -based flexible electrodes.
It is in urgent to develop a facile sulfur ion (S 2- ) detection platform with good selectivity, sensitivity and portability, since the abnormal concentration of S 2- poses a serious threat to human health and environment. Nanozymes are expected as promising colorimetric probe for visual assays, but the selectivity is challenged since the mostly typical nanozymes are oxidoreductase-like ones while various analytes possess equivalent redox capacity. Herein, one-platform-two-channels detection method with both excellent selectivity and sensitivity was constructed based on the bifunctions of tin telluride (SnTe) nanobelts. On one hand, SnTe and S 2- can react rapidly to form a special brown product SnS to assure the selectivity; On the other hand, SnTe with peroxidase-like activity can oxidize 3,3’,5,5’-tetramethylbenzidine (TMB) to blue ox-TMB in the presence of H 2 O 2 , while strong reducing S 2- could inversely convert the solution from blue to colorless and then brown, enabling a wider range of S 2- detection (10 nM-900 μM) and low detection limit of 7.1 nM. In addition, this detection platform could still show excellent specificity against 19 other interfering substances in sulfur soaps with complex components. With the assistance of the color-to-value conversion function of a smartphone, a portable signal reading-out platform was established, which can successfully achieve the accurate visualization of the S 2− in 10 min
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