A charge-transfer complex between graphene oxide (GO) and pyrene dye PNPB has been synthesized by a simple ion-exchange process. Its highly specific interactions with DNA compared to other biomolecules (see scheme) allows selective rapid detection of in biological mixtures. It also exhibits broadband optical limiting. Detailed facts importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available...

Black phosphorus (BP) is a very promising material for telecommunication due to its direct bandgap and strong resonant absorption in near‐infrared wavelength range. However, ultrafast nonlinear photonic applications relying on the photocarrier dynamics as well optical nonlinearity black remain unexplored. In this work, properties of solution exfoliated BP are investigated usage new saturable absorber high energy pulse generation fiber laser demonstrated. order avoid oxidization degradation,...

Rapid progresses have been achieved in the photonic applications of two-dimensional materials such as graphene, transition metal dichalcogenides, and topological insulators. The strong light–matter interactions large optical nonlinearities these atomically thin layered make them promising saturable absorbers for pulsed laser applications. Either Q-switching or mode-locking pulses with particular output characteristics can be by using different absorbers. However, it remains still very...

The presence of a direct band gap and high carrier mobility in few-layer black phosphorus (BP) offers opportunities for using this material infrared (IR) light detection. However, the poor air stability BP its large contact resistance with metals pose significant challenges to fabrication highly efficient IR photodetectors long lifetimes. In work, we demonstrate graphene-BP heterostructure photodetector ultrahigh responsivity long-term at wavelengths. our device architecture, top layer...

Abstract The manipulation of crystal orientation from the thermodynamic equilibrium states is desired in layered hybrid perovskite films to direct charge transport and enhance devices performance. Here we report a templated growth mechanism perovskites 3D-like which can be general design rule align along out-of-plane direction made by both spin-coating scalable blading process. method involves suppressing nucleation 3D inside solution using additional ammonium halide salts, forces film...

As a new type of two-dimensional crystal material, black phosphorus (BP) exhibits excellent electronics and optical performance. Herein, we focus on carrier relaxation dynamics nonlinear properties BP suspension. Atomic force microscopy, transmission electron spectrum are employed to characterize the structure linear BP. Additionally, pump-probe experiments at wavelength 1550 nm were carried out study in suspension, ultrafast recovery time was observed (τs = 24 ± 2 fs). Furthermore,...

Two-dimensional (2D) materials, such as graphene, transition metal dichalcogenides, and black phosphorus, have attracted intense interest for applications in ultrafast pulsed laser generation, owing to their strong light–matter interactions large optical nonlinearities. However, due the mismatch of bandgap, many these 2D materials are not suitable at near-infrared (NIR) waveband. Here, we report nonlinear properties α-Mo2C crystals usage a new broadband saturable absorber generation. It was...

Exploring the nonlinear photonics of emerging promising two-dimensional (2D) materials like MXenes will boost development broad-band optoelectronic and photonic applications. In this paper, optical response excited-carrier dynamics an MXene, Nb2C, are systematically investigated for wavelength range visible to near-infrared band. The obtained shows a excitation intensity dependence. imaginary part third-order susceptibility Imχ(3) figure merit were found be -1.4 × 10-10 esu 7.5 10-12 cm,...

Ultrasmall black phosphorus quantum dots (BPQDs) serve as the near-infrared light absorber and charge transfer layer in photocathode of a bifacial n-type dye sensitized solar cell. Wideband absorption ≈20% enhancement light-to-electron efficiency are accomplished due to fast carrier complementary by BPQDs demonstrating that BP has large potential photovoltaics. As service our authors readers, this journal provides supporting information supplied authors. Such materials peer reviewed may be...

Spatial self-phase modulation (SSPM) experiments on two-dimensional (2D) black phosphorus (BP) nanoflake suspensions are performed with focused femtosecond pulsed lasers at 350-1160 nm. In the broadband region, slope of SSPM ring number versus laser intensity varies from 0.99 to 0.34, which is larger than 0.25 in MoS2. We deduce portion fluid globe (ξ) be 0.0067, a constant independent intensity, when above 10 W/cm2. The nonlinear refractive index BP measured ∼10(-5) cm2 W(-1), and...

Perovskite photodetectors are fabricated via structuring a perovskite/organic heterojunction with CH 3 NH PbI and high‐mobility stable organic semiconductor dioctylbenzothieno [2,3‐b] benzothiophene (C8BTBT), which possess broad range photoresponse from ultraviolet to near‐infrared, fast response, excellent stability. The /C8BTBT exhibit an ratio of photocurrent dark current, I light / , as high 2.4 × 10 4 responsivity up 24.8 AW −1 response about 4.0 ms. Meanwhile, the can maintain 90%...

Understanding the photoexcited carrier-relaxation actions in ultrasmall black phosphorus quantum dots (BPQDs) will play a crucial role fields of electronics and optoelectronics. Herein, we report ultraviolet (UV) saturable absorption ultrafast dynamics BPQDs. The BPQDs are synthesized using facile liquid-exfoliation method possess diameter 3.8 ± 0.6 nm thickness 1.5 0.4 nm. Femtosecond open-aperture (OA) Z-scan measurements showed typical properties UV band. A negative nonlinear optical...

Passive cooling materials that spontaneously cool an object are promising choices for mitigating the global energy crisis. However, these effects usually weakened or lost when dust contaminates surface structure, greatly restricting their applications. In this work, a robust hierarchical porous polytetrafluoroethylene (PTFE) film with coral-like micro/nanostructures is generated by facile and efficient femtosecond laser ablation technique. Owing to its unique micro/nanostructures,...

Self-driven and continuous directional transport of water droplets in an oil environment has great potential applications microfluidics, oil-water separation, etc. Nevertheless, most current studies exploit behaviors occurring air, the regulation a viscous medium remains challenge. In this work, superhydrophilic geometry-gradient stainless steel platform with nanoparticle-covered nanoripple structures is proposed using femtosecond laser direct writing technology. The as-prepared...

2D photocatalytic TiO2/MoS2 hybrid nanosheets (HNs) have been prepared via a facile hydrothermal process. X-ray diffraction patterns and Raman spectra are carried out confirm well crystalized anatase 2H-MoS2 hybridization. Additional morphological microstructural tests verify distinct MoS2 framework, indicating the relatively stability of nanosheet platform with high specific surface area. UV–vis electrochemical impedance exhibit an enhanced light absorption ability conductivity compared to...

Abstract Inspired by nature, gradient surfaces have attracted broad research interest because of their potential in microfluidics, fog/water collection, and water electrolysis. Among the various techniques for preparing surfaces, laser processing is substrate‐independent, facile efficient, pattern‐diverse, which can be used to prepare diverse surfaces. Here, recent advances fabrication wettability applications are summarized. The preparation principles advantages introduced. Various...

Abstract Bulk germanium as a group‐IV photonic material has been widely studied due to its relatively large refractive index and broadband low propagation loss from near‐infrared mid‐infrared. Inspired by the research of graphene, 2D counterpart bulk germanium, germanene, discovered characteristics Dirac electrons have observed. However, optical properties germanene still remain elusive. In this work, several layers are prepared with electronic morphology, band structure, carrier dynamics,...

Abstract Interlayer charge‐transfer (CT) in 2D atomically thin vertical stacks heterostructures offers an unparalleled new approach to regulation of device performance optoelectronic and photonics applications. Despite the fact that saturable absorption (SA) involves highly efficient optical modulation space time domain, lack explicit SA mechanism at nanoscale prevents this feature from realizing nanophotonic modulation. Here, enhancement response via CT WS 2 /graphene heterostructure is...

NbOCl 2 exhibits exceptional nonlinear optical response, particularly for second harmonic generation (SHG).

We report on controlled synthesis of uniform LnVO4 (Ln = Ce and Nd) nanocrystals (NCs) with square-plate H-shaped morphologies in nanosized reverse microemulsion reactors, via a facile solvo/hydrothermal strategy. The NCs were thoroughly characterized by X-ray diffraction, transmission electron microscopy (TEM), atomic force (AFM), energy-dispersive spectroscopy (EDS), infrared absorption spectroscopy, photoluminescence. Possible mechanisms the rare-earth orthovanadate NC growth size shape...

Two strategies have been explored for organic functionalizations of ZnO nanotetrapods via anchoring groups carboxylate and phosphonate. With these methods, oleyl chains were assembled on the surfaces nanotetrapods, significantly enhancing their solubility in nonpolar solvents, such as chloroform toluene. The surface functionalization extended to electroactive photoactive molecules protoporphyrin C(60) nanotetrapods. surface-modified characterized comprehensively, revealing a uniform,...

Ein Charge-Transfer-Komplex zwischen Graphenoxid (GO) und dem Pyrenfarbstoff PNPB wurde durch einen einfachen Ionenaustauschprozess hergestellt. Die hochspezifischen Wechselwirkungen des Komplexes mit DNA (siehe Schema) ermöglichen die selektive schnelle Detektion von in Mischungen verschiedener Biomoleküle. Zudem zeigt er eine breitbandige optische Leistungsbegrenzung.

We report the comparative in situ fracture toughness testing on single-edge V/U-notched multilayer graphenes and boronitrenes a high-resolution transmission electron microscope (HRTEM). The nanostructures of notch tips edges tested specimens are unambiguously resolved using HRTEM. By analyzing tip stresses finite element method, is determined to be 12.0 ± 3.9 5.5 0.7 MPa√m, respectively, taking into account blunting effects.

A new approach to synthesize self-doped colloidal Cu3−xP NCs with controlled size and localized surface plasmon resonance absorption is reported. These show ultrafast exciton dynamics huge optical nonlinearities due plasmonic resonances, which afford the first demonstration of as simple, effective, solution-processed nonlinear absorbers for high-energy Q-switched fiber laser. As a service our authors readers, this journal provides supporting information supplied by authors. Such materials...