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Asymmetric contacts were used to assemble extremely photosensitive and ultrafast self-powered photodetectors (SPDs) on rigid and polyimide (PI) substrate based on one-dimensional (1D)-CdS nanobelts. The photoresponse characteristics of the constructed...

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Ultrasensitive, fast response, and broad spectral response flexible photodetectors (FPDs) would be desirable for advanced technology. Here, high purity tin cadmium sulfide (Sn x Cd 1−x S) micronanostructures (nanobelts, tapered nanobelts with/without hexagonal tips, nanorods, nanocombs, and nanoflowers) were grown via a facile one-step chemical vapor deposition (CVD) route and utilized for fabrication of metal− semiconductor−metal (MSM) rigid/flexible nanodevices. Compared to pristine CdS nanobelts, the Raman spectrum of Sn x Cd 1−x S nanobelts exhibits a 3 cm −1 red shift at room temperature. The temperature-dependent intensity ratio (I 2LO / I 1LO ) varies from 1.21 to 1.89, reflecting improved electron−lattice interaction in the Sn x Cd 1−x S nanobelts. In addition, a ternary nanobelt based rigid device sensitively responds to UV-Vis light with high responsivity (4.82 × 10 1 A/W), high external quantum efficiency (1.46 × 10 4 %), and fast response speed (20 ms). Compared to pristine CdS nanobelt devices, it responds to a broader spectral range while maintaining outstanding photoconductive characteristics. Additionally, Sn x Cd 1−x S nanobelt FPDs exhibited good mechanical and electrical stabilities with a performance comparable to those of rigid devices. The result indicates that the ternary Sn x Cd 1−x S micronanostructures may be an excellent candidate to enhance the optoelectronic performances of micro/nanodevices.

Low-cost multicomponent alloyed one-dimensional (1D) semiconductors exhibit broadband absorption from the ultraviolet to the near-infrared regime, which has attracted a great deal of interest in high-performance flexible optoelectronic devices. Here, we report the facile one-step fabrication of high-performance broadband rigid and flexible photodevices based on multicomponent alloyed 1D cadmium–sulfur–selenide (CdS x Se1–x ) micro-nanostructures obtained via a vapor transport route. Photoresponse measurements have demonstrated their superior spectral photoresponsivity (5.8 × 104 A/W), several orders of magnitude higher than the pristine CdSe nanobelt photodevice, high specific detectivity (2 × 1015 Jones), photogain (1.2 × 105), external quantum efficiency (EQE, 1.4 × 107%), rapid response speed (13 ms), and excellent long-term environmental stability. The multicomponent alloyed CdS x Se1–x nanobelt photodevice demonstrated about three times higher photocurrent as well as can operate under multiple color illuminations (200–800 nm) and at a high applied bias of 10 V with the photoresponsivity and EQE being boosted to 4.34 × 105 A/W and 8.96 × 107%, respectively. Furthermore, multicomponent alloyed CdS x Se1–x nanobelt flexible photodevices show excellent mechanical and flexural photostabilities with identical photoresponse as rigid nanodevices. The improvement mechanism found in the present research can be exploited to lead to the design of high-performance flexible photodevices comprising other multicomponent nanomaterials.

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A strong base anion exchange resin Amberlite IRA-400 Cl − and its hybrids with Mn(OH) 2 and Cu(OH) 2 are used for the removal of chromium from the synthetic spent tannery bath. The recovery is examined by varying the experimental conditions, viz., resin dosage, stirring speed, and temperature. The rate of chromium removal by Amberlite IRA-400 Cl − increased almost four times when the resin dosage was increased from 0.2 to 1.0 g. Furthermore, the rate of chromium sorption almost doubled when the stirring speed was increased from 100 to 1,000 rpm, suggesting that the sorption is a diffusionally controlled process. The chromium removal capacity also increased with the rise of temperature, showing the endothermic nature of the process. The results are explained with the help of film diffusion, particle diffusion, and Lagergren pseudo-first-order kinetic models. The kinetics results of the Amberlite IRA-400 Cl − are compared with its hybrid anion exchange resins IRA-400 Mn(OH) 2 and IRA-400 Cu(OH) 2 . It is found that the hybrid ion exchangers have greater removal ability and fast kinetics as compared to the parent exchanger.