Solid-state fiber-based supercapacitors have been considered promising energy storage devices for wearable electronics due to their lightweight and amenability to be woven into textiles. Efforts have been made to fabricate a high performance fiber electrode by depositing pseudocapacitive materials on the outer surface of carbonaceous fiber, for example, crystalline manganese oxide/multiwalled carbon nanotubes (MnO/MWCNTs). However, a key challenge remaining is to achieve high specific capacitance and energy density without compromising the high rate capability and cycling stability. In addition, amorphous MnO is actually preferred due to its disordered structure and has been proven to exhibit superior electrochemical performance over the crystalline one. Herein, by incorporating amorphous MnO onto a well-aligned MWCNT sheet followed by twisting, we design an amorphous MnO@MWCNT fiber, in which amorphous MnO nanoparticles are distributed in MWCNT fiber uniformly. The proposed structure gives the amorphous MnO@MWCNT fiber good mechanical reliability, high electrical conductivity, and fast ion-diffusion. Solid-state supercapacitor based on amorphous MnO@MWCNT fibers exhibits improved energy density, superior rate capability, exceptional cycling stability, and excellent flexibility. This study provides a strategy to design a high performance fiber electrode with microstructure control for wearable energy storage devices.
Molybdenum disulfide (MoS 2) has been extensively for biomedical applications due to itsexcellent photothermal conversion ability. In this paper, we reported a nanoplatform based on folic acid (FA) targeted dual-stimuli responsive MoS 2 nanosheets (FA-BSA-PEI-LA-MoS 2-LA-PEG, FBPMP) and explore this for the treatment of FA-receptor positive human breast cancer. The nanocomposites had a uniform diameter (133 nm), and could be loaded with the anti-cancer drug doxorubicin (DOX) to a high capacity (151.4 mg/g). The release of DOX was greatly accelerated at pH 5.0 as compared to pH 7.4. In addition, it was found that drug release is enhanced under the near infrared laser (NIR) irradiation, showing that the composites can be used as dual responsive systems, with DOX release controllable through pH or NIR irradiation. MTT assays and confocal experiments showed that FBPMP nanoplatform could selectively target and kill FA-positive MDA-MB-231 cells (a human breast cancer cell line). The platform also allowed the combination of chemotherapy and photothermal therapy, which led to synergistic effects superior to either monotherapy. The functionalized MoS 2 nanoplatform developed in this work hence could be a potent system for targeted drug delivery and synergistic chemo-photothermal cancer therapy.
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