Carbon nanodots (C-dots) synthesized by electrochemical ablation and small molecule carbonization, as well graphene quantum dots (GQDs) fabricated solvothermally cutting oxide, are three kinds of typical green fluorescence carbon nanomaterials. Insight into the photoluminescence origin in these fluorescent nanomaterials is one important matters current debates. Here, a common luminescence C-dots GQDs unraveled ultrafast spectroscopy. According to change surface functional groups during...

Three-dimensional photonic crystal structures were fabricated with laser microfabrication techniques through two-photon-absorption photopolymerization of resin. Significant band-gap effects in the infrared wavelength region observed from “layer-by-layer” structures.

Two methods for the linear approximation of a transfer function with pole fractional power are presented. Analog circuit models developed, and their frequency response curves step compared. It was found that Padé method gives better than Wang Hsia's within limit as specified.

Abstract Actuators that can convert environmental stimuli into mechanical work are widely used in intelligent systems, robots, and micromechanics. To produce robust sensitive actuators of different scales, efforts devoted to developing effective actuating schemes functional materials for actuator design. Carbon‐based nanomaterials have emerged as preferred candidates systems because their low cost, ease processing, strength, excellent physical/chemical properties. Especially, due...

The surface wettability control of solid materials has been considered as an essential aspect chemistry. In the past decade, superhydrophobic surfaces have revealed a cornucopia novel structural and functional properties, exhibiting considerable importance in both fundamental research practical applications. this review, we summarize recent developments with unique properties. Both fabricative methods working performance multidisciplinary functionalities including self-cleaning,...

In view of mass‐production and solution‐processing capabilities, graphene oxides (GOs), generally prepared by chemical oxidation graphite subsequent exfoliation in aqueous solution, are widely used as an effective route to graphene‐like materials. However, the oxygen‐containing groups (OCGs) on sheets make GO insulating, which significantly restricts its applications, especially for electronics. Therefore, reduction methods that remove OCGs become critical. recent years, addition thermal...

Abstract Rice leaves with anisotropic sliding properties have the ability to directionally control movement of water microdroplets. However, realization artificial biosurfaces has remained challenging. It is found, by a systematic investigation, that height 200‐μm‐width groove arrays on rice reaches up 45 μm, far greater than smaller microgrooves are widely adopted for study wetting. A new model based three‐level microstructures (macro/micro/nano) developed interpret behavior. Moreover,...

Precise tuning of surface wettability – by means curvature-driven reversible switching from the pinned to roll-down superhydrophobic state (see figure) is reported for first time. The adhesion force and sliding behaviors poly(dimethylsiloxane) (PDMS) pillar arrays show strong dependence on curvature. Alteration curvature allows a water droplet be easily adjusted " pinned" "roll-down" state, which provides possibility precise, in situ control movements droplets.

A systematic study of 32 honeycomb monolayer II-VI semiconductors is carried out by first-principles methods. While none the two-dimensional (2D) structures can be energetically stable, it appears that BeO, MgO, CaO, ZnO, CdO, CaS, SrS, SrSe, BaTe, and HgTe monolayers have a good dynamic stability. The stability five oxides consistent with work published Zhuang et al. [Appl. Phys. Lett. 103, 212102 (2013)]. rest compounds in form are dynamically unstable, revealed phonon calculations. In...

Inspired by natural autonomous systems that demonstrate controllable shape, appearance, and actuation under external stimuli, a facile preparation of moisture responsive graphene‐based smart actuators unilateral UV irradiation graphene oxide (GO) papers is reported. GO found to be an effective protocol trigger the reduction GO; however, due limited light transmittance thermal relaxation, thick paper cannot fully reduced. Consequently, tuning photoreduction gradient, anisotropic GO/reduced...

A facile and cost-effective preparation of moisture-responsive graphene bilayer paper by focused sunlight irradiation is reported. The smart shows properties due to selective adsorption water molecules, leading controllable actuation under humid conditions. In this way, graphene-based actuators including a claw, an orientable transporter, crawler robot are successfully developed.

Abstract Metasurfaces, planer artificial materials composed of subwavelength unit cells, have shown superior abilities to manipulate the wavefronts electromagnetic waves. In last few years, metasurfaces been a burgeoning field research, with large variety functional devices, including planar lenses, beam deflectors, polarization converters, and metaholograms, being demonstrated. Up date, majority cannot be tuned postfabrication. Yet, dynamic control optical properties is highly desirable for...

To date, slow Set operation speed and high Reset power remain to be important limitations for substituting dynamic random access memory by phase change memory. Here, we demonstrate cell based on Ti0.4Sb2Te3 alloy, showing one order of magnitude faster as low one-fifth power, compared with Ge2Sb2Te5-based at the same size. The enhancements may rooted in common presence titanium-centred octahedral motifs both amorphous crystalline phases. essentially unchanged local structures around titanium...

Abstract Stretchable organic light-emitting devices are becoming increasingly important in the fast-growing fields of wearable displays, biomedical and health-monitoring technology. Although highly stretchable have been demonstrated, their luminous efficiency mechanical stability remain impractical for purposes real-life applications. This is due to significant challenges arising from high strain-induced limitations on structure design device, materials used difficulty controlling...

Recent years have seen a considerable growth of research interests in developing novel technologies that permit designable manufacture and controllable manipulation actuators. Among various fabrication driving strategies, light has emerged as an enabler to reach this end, contributing the development Several accessible light‐mediated manufacturing technologies, such ultraviolet (UV) lithography direct laser writing (DLW), are summarized. A series light‐driven strategies including optical...

The lossy nature of plasmonic wave due to absorption is shown become an advantage for scaling-up a large area surface nanotexturing transparent dielectrics and semiconductors by self-organized sub-wavelength energy deposition leading ablation pattern-ripples-using this nano-printing. Irreversible nanoscale modifications are delivered plasmon polariton (SPP) using: (i) fast scan (ii) cylindrical focusing femtosecond laser pulses high patterning throughput. mechanism ripple formation on ZnS...

Abstract Transparent conductive electrodes, as transmission windows of photons and electrons, play important roles in high‐performance organic optoelectronic devices. The replacement widely used indium tin oxide (ITO) electrodes has been attempted due to the increasing cost intrinsically brittle characteristics ITO. Ultrathin metal films, with excellent optoelectrical features, high flexibility, sufficient mechanical stability, have considered a potential candidate for use transparent...

Abstract Muscles and joints make highly coordinated motion, which can be partly mimicked to drive robots or facilitate activities. However, most cases primarily employ actuators enabling simple deformations. Therefore, a mature artificial motor system requires many assembled with jointed structures accomplish complex motions, posing limitations challenges the fabrication, integration, applicability of system. Here, holistic muscle integrated light‐addressable nodes, using one‐step laser...

Inspired from fish scales that exhibit unique underwater superoleophobicity because of the presence micronanostructures and hydrophilic slime on their surface, we reported here facile fabrication superoleophobic membranes by coating a layer graphene oxide (GO) commercially available wire meshes with tunable pore sizes. Using mesh as ready-made mask, GO-embellished open apertures (GO@mesh) could be readily fabricated after subsequent O2 plasma treatments back side. Interestingly, congenital...