Inspired by octopus arms, researchers demonstrate an uncomplicated and scalable templating technology for fabricating nanosuckers on PDMS substrates, using a scalable spin-coating technology. As the nanosuckers are pressed against a substrate, the flexible nanosuckers confirm to the substrate and deform by releasing the internal air between nanosuckers and the substrate, forming a seal and generating an adhesion force. The nanosucker adhesion is maintained over multiple contact cycles on both wet and dry surfaces.
The development of porous one-dimensional (1D) nanomaterials with designed properties and architectures has led to significant advances in electrochemical energy storage. A recent review article highlights the state-of-the-art on porous 1D nanostructures, from methodologies for rational and controllable synthesis (electrospinning, liquid phase method, template-assisted method, chemical deposition method, and chemical etching) to their successful application in different types of energy storage devices.
Inspired by the unique optical and electronic property of graphene, two-dimensional layered materials - as well as their hybrids - have been intensively investigated in recent years, driven by their potential applications for nanoelectronics. The broad spectrum of atomic layered crystals includes transition metal dichalcogenides (TMDs), semiconducting dichalcogenides, monoatomic buckled crystals, such as black phosphorous (BP), and diatomic hexagonal boron nitride, etc. Tihis article examines the recent advancement of flexible 2D electronic devices based on TMDs and BP.
Several research projects are working on reinventing the contact lens as a smart electronic device that, for instance, works as a self-powered biosensor for various point-of-care monitoring and wireless biomedical sensing. n addition to sensors, researchers are devising numerous applications for smart contact lenses, ranging from drug delivery systems to protection from electromagnetic wave damage. An application closer to contact lenses' original function, graphene can change the focal length of a polymeric soft contact lens in order to adjust near- and farsightedness.
Researchers have proposed and proved an innovative strategy of anionic regulation. The construction of active sites with intrinsic oxygen evolution reaction (OER) is of great significance to overcome the limited efficiency of abundant sustainable energy devices such as fuel cells, rechargeable metal-air batteries, and in water splitting. Anionic regulation of electrocatalysts by modulating the electronic structure of active sites significantly promotes OER performance.
Access to accurate surface energy values of graphene is not only of fundamental interest, but provides a useful reference for anyone involved in research on graphene properties, (surface) modifications, and the implementation of graphene in devices. New research demonstrates the successful application of the graphene surface force balance (g-SFB) to directly measure the surface energy of pure graphene. This work is of fundamental interest to a broad community and will aid the advancement of fundamental measurements of 2D and other nanomaterials.
A recent review article highlights the role of electrochemistry in synthesizing materials for self-powered micro- and nanodevices; the aspect of charge transfer and changes in electrochemical potentials for locomotion; control of self-propelled motion using electrochemistry and electric fields; and possible applications in electrochemical sensing and energy generation using micro- and nanoscale motion. The authors discuss various electrochemical techniques, which allow for the fabrication of large amounts of micro/nanorobots from diverse materials, with and without the use of templates.
Supercapacitors, a rapidly emerging type of energy storage device, hold great potential due to their interesting characteristics: high power density, fast charge and discharge rates, and long-term cycling life. However, the use of supercapacitors is severely limited by their low energy density, which is one to two magnitudes lower in comparison with Li-ion batteries. In new work, researchers have developed a low-crystalline FeOOH nanoparticle anode with excellent comprehensive electrochemical performances at both low and high mass loadings as potential replacements for carbon negative electrodes in full supercapacitor devices.