While liquid exfoliation is a powerful technique to produce defect-free nanosheets in large quantities, its usefulness limited by broad nanosheet thickness distributions and low monolayer contents. Here we demonstrate processing techniques, based on iterative centrifugation cascades, which can be designed achieve either highly efficient size-selection and/or enrichment. The resultant size-selected dispersions were used establish quantitative metrics determine volume fraction, as well mean...

The recent progress on black phosphorus makes it a promising candidate material for broadband nanophotonic devices, especially operating in the mid-infrared spectral region. Here, excited carrier dynamics and nonlinear optical response of unoxidized nanosheets their wavelength dependence were systematically studied from 800 nm to 2.1 μm. wavelength-dependent relaxation times are determined be 360 fs 1.36 ps with photon energies 1.55 0.61 eV. In comparative study graphene, we found that has...

Liquid phase exfoliation is a commonly used method to produce 2D nanosheets from range of layered crystals. However, such display broad size and thickness distributions correlations between area thickness, issues that limit nanosheet application potential. To understand the factors controlling process, we have liquid-exfoliated 11 different materials, size-selecting each into fractions before using AFM measure length, width, for fraction. The resultant data show clear power-law scaling with...

Abstract Identifying cheap, yet effective, oxygen evolution catalysts is critical to the advancement of water splitting. Using liquid exfoliated Co(OH) 2 nanosheets as a model system, simple procedure developed maximize activity any reaction nanocatalyst. First nanosheet edges are confirmed active areas by analyzing catalytic function size. This allows authors select smallest (length ≈50 nm) best performing catalysts. While number sites per unit electrode area can be increased via thickness,...

Printed 2D materials, derived from solution-processed inks, offer scalable and cost-effective routes to mechanically flexible optoelectronics. With micrometer-scale control broad processing latitude, aerosol-jet printing (AJP) is of particular interest for all-printed circuits systems. Here, AJP utilized achieve ultrahigh-responsivity photodetectors consisting well-aligned, percolating networks semiconducting MoS2 nanosheets graphene electrodes on polyimide substrates. Ultrathin (≈1.2 nm...

Abstract Extinction spectra of nanomaterial suspensions can be dominated by light scattering, hampering quantitative spectral analysis. No simple models exist for the wavelength-dependence scattering coefficients in arbitrary-sized, high-aspect-ratio nanoparticles. Here, BN, talc, GaS, Ni(OH) 2 , Mg(OH) and Cu(OH) nanosheets are used to explore non-resonant wide-bandgap 2D nanomaterials. Using an integrating sphere, coefficient ( σ ) were measured a number size-selected fractions each...

Liquid-phase exfoliation has progressed in recent years to become a common method for production of 2D materials. During exfoliation, surfactants can be used stabilize the nanosheets against reaggregation. Here, using WS2 as model system, we explore effect varying surfactant type and concentration on yield dimensions exfoliated nanosheets. For ionic surfactants, mass produced was widely constant low concentrations but decreased sharply above ∼10 mM, regardless surfactant. Very similar...

Abstract Rapid, inexpensive, and easy-to-use coronavirus disease 2019 (COVID-19) home tests are key tools in addition to vaccines the world wide fight eliminate national local shutdowns. However, currently available for SARS-CoV-2, virus that causes COVID-19, too expensive, painful, irritating, or not sufficiently sensitive routine, accurate testing. Herein, we employ custom-formulated graphene inks aerosol jet printing create a rapid electrochemical immunosensor direct detection of...

Although printed networks of semiconducting nanosheets have found success in a range applications, conductive nanosheet are limited by low conductivities (<106 S m-1 ). Here, dispersions silver (AgNS) that can be into highly described. Using commercial thermal inkjet printer, AgNS patterns with unannealed up to (6.0 ± 1.1) × 106 printed. These form electromagnetic interference shields record shielding effectiveness >60 dB the microwave region at thicknesses <200 nm. High resolution line...

Due to their superior optoelectronic properties, monolayer two-dimensional (2D) transition metal dichalcogenides (TMDs) have attracted significant attention for electroluminescent devices. However, challenges in isolating optoelectronically active TMD monolayers using scalable liquid phase exfoliation precluded electroluminescence large-area, solution-processed films. Here, we overcome these limitations and demonstrate from molybdenum disulfide (MoS2) nanosheet films by employing a...

Liquid phase exfoliation (LPE) has proven to be a versatile technique produce uncharged 2D nanosheets from layered crystals. However, almost all studied starting materials consist of pure powder or crystals purchased chemical suppliers. To test the true versatility this process, we have attempted process three with varying degrees purity and composition. We subjected talcum (principle component: compound talc), Fuller's earth cat litter (known contain silicate compounds, most notably...

Abstract Mid‐infrared ultrafast lasers have emerged as a promising platform for both science and industry because of their inherent high raw power eye‐safe spectrum. 2D nanostructures such graphene photonic materials laser mode‐locking to generate ultrashort pulses. However, there are still many unanswered questions about graphene's key advantages be practical devices, especially over the matured semiconductor saturable absorber mirror (SESAM). In this work, we conducted systematic...

Molybdenum dioxide (MoO

Abstract Many promising supercapacitor electrode materials have high resistivity and require conductive additives to function effectively. However, the detailed role of additive is not understood. Here, this question resolved by applying a quantitative model for resistance‐limited electrodes Co(OH) 2 ‐nanosheet/carbon nanotube composites. Without nanotubes, theory predicts experiments show that while low‐rate capacitance increases linearly with thickness, rate decreases thickness due slow...

We summarize recent advances in the production of liquid-exfoliated transition metal dichalcogenide (TMD) nanosheets with controlled size and thickness. Layered crystals molybdenum disulphide (MoS2) tungsten (WS2) are exfoliated aqueous surfactant solution by sonication. This yields highly polydisperse mixtures containing broad thickness distributions. However, for most purposes, specific sizes (in terms both lateral dimension thickness) required. For example, large thin desired (opto)...

Abstract Thin films of noble-metal-based transition metal dichalcogenides, such as PtSe 2 , have attracted increasing attention due to their interesting layer-number dependent properties and application potential. While it is difficult cleave bulk crystals down mono- few-layers, a range growth techniques been established producing material varying quality layer number. However, date, no reliable high-throughput characterization assess number exists. Here, we use top-down liquid phase...

Implantable polymeric biodegradable devices, such as vascular scaffolds, cannot be fully visualized using standard X-ray-based techniques, compromising their performance due to malposition after deployment. To address this challenge, we describe a new radiopaque and photocurable liquid polymer-ceramic composite (mPDC-MoS

Atomically thin materials are exhibiting unique physical properties. This work investigates the size dependent nonlinear optical response of black phosphorus nanosheets for nanosecond laser pulses. Material is prepared with use Liquid Phase Exfoliation. Experiments performed using open aperture Z-scan technique at 532 nm wavelength ND:Yag, 10 Hz ns as source. We report that absorption coefficient strongly on flake lateral dimension well intensity.

α-RuCl3 is a layered transition metal halide that possesses range of exotic magnetic, optical, and electronic properties including fractional excitations indicative proximate Kitaev quantum spin liquid (QSL). While previous reports have explored these on idealized single crystals or mechanically exfoliated samples, the scalable production nanosheets has not yet been demonstrated. Here, we perform liquid-phase exfoliation (LPE) through an electrochemically assisted approach, which yields...

Long-term stable gas sensors by tiled networks from LPE-PtSe 2 .

Additive manufacturing holds promise for rapid prototyping and low-cost production of biosensors diverse pathogens. Among additive methods, screen printing is particularly desirable high-throughput sensing platforms. However, this technique needs to be combined with carefully formulated inks, postprocessing, selective functionalization meet all requirements high-performance biosensing applications. Here, we present screen-printed graphene electrodes that are processed thermal annealing...

We summarize recent advances in the production of liquid-exfoliated transition metal dichalcogenide (TMD) nanosheets with controlled size and thickness.Layered crystals molybdenum disulphide (MoS 2 ) tungsten (WS are exfoliated aqueous surfactant solution by sonication.This yields highly polydisperse mixtures containing broad thickness distributions.However, for most purposes, specific sizes (in terms both lateral dimension thickness) required.For example, large thin desired (opto)...

Abstract Originating from the hexagonal arrangement of magnetic ions in presence strong spin orbit coupling, α -RuCl 3 is considered as model system for Kitaev-Heisenberg model. While properties have been studied bulk single crystals or micromechanically-exfoliated nanosheets, little known about nanosheets’ after exfoliation by techniques suitable mass production such liquid phase (LPE). Here, we demonstrate sonication-assisted LPE on an inert atmosphere. Coupled with centrifugation-based...

Monolayer-enriched liquid phase exfoliated WS₂ is embedded into a polymer matrix. The resultant thin films are homogeneous, mechanically robust and smooth. Optical monolayer properties (<italic>e.g.</italic> photoluminescence) of the retained in films.