Silver nanowire (AgNW) networks are considered to be promising structures for use as flexible transparent electrodes for various optoelectronic devices. One important application of AgNW transparent electrodes is the flexible touch screens. However, the performances of flexible touch screens are still limited by the large surface roughness and low electrical to optical conductivity ratio of random network AgNW electrodes. In addition, although the perception of writing force on the touch screen enables a variety of different functions, the current technology still relies on the complicated capacitive force touch sensors. This paper demonstrates a simple and high-throughput bar-coating assembly technique for the fabrication of large-area (>20 × 20 cm), highly cross-aligned AgNW networks for transparent electrodes with the sheet resistance of 21.0 Ω sq at 95.0% of optical transmittance, which compares favorably with that of random AgNW networks (sheet resistance of 21.0 Ω sq at 90.4% of optical transmittance). As a proof of concept demonstration, we fabricate flexible, transparent, and force-sensitive touch screens using cross-aligned AgNW electrodes integrated with mechanochromic spiropyran-polydimethylsiloxane composite film. Our force-sensitive touch screens enable the precise monitoring of dynamic writings, tracing and drawing of underneath pictures, and perception of handwriting patterns with locally different writing forces. The suggested technique provides a robust and powerful platform for the controllable assembly of nanowires beyond the scale of conventional fabrication techniques, which can find diverse applications in multifunctional flexible electronic and optoelectronic devices.

The development of new materials has brought about a change in the world since the era of bronze and iron. The evolution of stainless steel, concrete, and silicon redefined new boundaries and made modern era possible. It would not be a hyperbole if the present age is termed as the age of nanomaterials. Nanomaterials can be categorized in various types based on their shape and structure such as 0D (quantum dots (QDs)), 1D (nanorods, nanotubes), 2D (nanosheets), and 3D (flower like, cubical etc.).Molybdenum disulfide (MoS 2 ), a typical layered 2D transition metal dichalcogenide, has received colossal interest in the past few years due to its unique structural, physicochemical, optical, and biological properties. While MoS 2 is mostly applied in traditional industries such as dry lubricants, intercalation agents, and negative electrode material in lithium-ion batteries, its 2D and 0D forms have led to diverse applications in sensing, catalysis, therapy, and imaging. Herein, a systematic overview of the progress that is made in the field of MoS 2 research with an emphasis on its different biomedical applications is presented. This article provides a general discussion on the basic structure and property of MoS 2 and gives a detailed description of its different morphologies that are synthesized so far, namely, nanosheets, nanotubes, and quantum dots along with synthesis strategies. The biomedical applications of MoS 2 -based nanocomposites are also described in detail and categorically, such as in varied therapeutic and diagnostic modalities like drug delivery, gene delivery, phototherapy, combined therapy, bioimaging, theranostics, and biosensing. Finally, a brief commentary on the current challenges and limitations being faced is provided, along with a discussion of some future perspectives for the overall improvement of MoS 2 -based nanocomposites as a potential nanomedicine. 2D MoS 2 -Based Nanomaterials www.advancedsciencenews.com

An aqueous Na-ion based hybrid capacitor has been successfully developed by highly porous graphitic carbon (HPGC) derived by waste writing paper and a new electrode material as negative and positive electrode, respectively. HPGC was prepared via hydrothermal carbonization and subsequent KOH activation of waste writing paper which showed highly porous stacked sheet like morphology with exceptionally high BET specific surface area (1254 m 2 g -1 ). HPGC exhibited typical electrical double layer capacitor (EDLC) behavior with a high specific capacitance of 384 F g -1 and good negative working potential (-1.0 V) in aqueous electrolyte. On the other hand, Ni2P2O7 was synthesized by simple co-precipitation technique and tested as cathode material which delivered a maximum specific capacitance of 1893 F g -1 at 2 A g -1 current density. The fabricated HPGC||Ni2P2O7 hybrid device displayed excellent cyclic stability up to 2000 cycles and delivered maximum energy density of 65 W h kg -1 at 800 W kg -1 power density in Na-ion based aqueous electrolyte.capacitive electrode by hemp carbonization and assembled

Nanourchin-shaped narrow-band-gap semiconductor photocatalysts with high surface area combined with good crystallinity result in effective photocatalysis. In this work, the impregnating growth of 1D CdS nanowires onto Al 2 O 3 and ZnO templates as cores generates novel urchinlike morphology of CdS@oxide photocatalysts. The CdS@Al 2 O 3 and CdS@ZnO nanourchins explicitly show a major role in enhanced hydrogen generation with apparent quantum yields (AQY) of 11% and 15%, respectively. Mechanistically, the template-based CdS can influence the photocatalytic activity in two ways: (i) direct well-dispersed growth of CdS onto the oxide core, leading to a high surface area for enhanced light absorption, and (ii) charge transfer from the conduction band of highly crystalline CdS to that of the oxide, which facilitate efficient charge separation for hydrogen production. Following these two mechanisms, a simple, low-cost, and environmentally friendly hydrothermal strategy is employed to synthesize novel nanourchin-shaped CdS-based heteroarrays. This new morphology stimulates the surface area per unit volume of the photocatalyst and exhibits promising application for photocatalytic water splitting.

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SnS 2 is an emerging candidate for an electrode material because of the considerable interlayer spaces in its crystal structures and the large surface area. SnS 2 as a photocatalyst and in lithium ion batteries has been reported. On the other hand, there are only a few reports of their supercapacitor applications. In this study, sheetlike SnS 2 (SL-SnS 2 ), flowerlike SnS 2 (FL-SnS 2 ), and ellipsoid-like SnS 2 (EL-SnS 2 ) were fabricated via a facile solvothermal route using different types of solvents. The results suggested that the FL-SnS 2 exhibited better capacitive performance than the SL-SnS 2 and EL-SnS 2 , which means that the morphology has a significant effect on the electrochemical reaction. The FL-SnS 2 displayed higher supercapacitor performance with a high capacity of approximately ∼431.82 F/g at a current density of 1 A/g. The remarkable electrochemical performance of the FL-SnS 2 could be attributed to the large specific surface area and better average pore size. These results suggest that a suitable solvent is appropriate for the large-scale construction of SnS 2 with different morphologies and also has huge potential in the practical applications of high-performance supercapacitors.

Hierarchical structured cobalt phosphate (Co 3 (PO 4 ) 2 ) nanoflakes were synthesized by simple co-precipitation method and employed as electrodes for supercapacitor. The purity and phase formation of the synthesized (Co 3 (PO 4 ) 2 ) nanoflakes were ascertained by XRD and XPS measurements. The surface morphology and elemental composition of the Co 3 (PO 4 ) 2 nanoflakes were observed by using FE-SEM, TEM and EDS. The electrochemical behaviour of the present material as an anode material for supercapacitor was explored by cyclic voltammetric measurements and galvanostatic charge-discharge analysis. The specific capacitance for the as-synthesized and calcined (Co 3 (PO 4 ) 2 ) nanoflakes electrodes was 132 and 210 Fg À1 at a scan rate of 10 mV s À1 . The enhanced electrochemical behaviour of the calcined Co 3 (PO 4 ) 2 nanoflakes might be due to its well crystalline nature which offers more active sites for faradaic reactions, good conductivity and rapid diffusion of the electrolyte ions. The fabricated Co 3 (PO 4 ) 2 electrode displayed an excellent cyclic stability with 95 % retention of initial specific capacitance after 800 cycles. An enhanced effect on the electrochemical properties of the Co 3 (PO 4 ) 2 nanoflakes has been proposed.