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A Simple and Robust Method to Prepare Polyelectrolyte Brushes on Polymer Surfaces

A robust and facile method is presented to prepare polyelectrolyte brush coatings on polystyrene. Linear polyglycerolsulfate (lPGS) is grafted to the surface utilizing a benzophenone-containing anchor block. The grafting process is mediated by the chaotropic salt guanidinium chloride. Coated surfaces exhibit characteristics of polyelectrolyte brush...

Electrochemical Biosensors Employing Hybridization Chain Reaction: From Structural Design to Applications

Electrochemical biosensors often rely on amplification strategies to achieve ultrasensitivity for the low abundant analytes. Hybridization chain reaction (HCR) is extremely cost-effective, simple, and enzyme free. More significantly, it can achieve amplification under ambient conditions. The recent advances of HCR-coupled electrochemical sensors over...

Organic Field‐Effect Transistors Based on Ternary Blends Including a Fluorinated Polymer for Achieving Enhanced Device Stability

Organic semiconductor thin films based on polymeric ternary blends including a hydrophobic fluorinated polymer are prepared as a novel route to engineer long-term reliable organic field-effect transistors. The devices in which 20% of fluorinated polymer is added exhibit an improved bias stress and an exceptional environmental stability, without significantly...

High‐Capacitance Nanoporous Noble Metal Thin Films via Reduction of Sputtered Metal Oxides

High-capacitance porous metal layers give reproducible and record-breaking electrochemical properties. Abstract Increasing the electrochemical surface area of noble metal electrodes is vital for many applications, including catalysis and bioelectronics. Herein, a method is presented for obtaining porous noble metal thin films via reactive magnetron...

Skyrmion Stabilization at the Domain Morphology Transition in Ferromagnet/Heavy Metal Heterostructures with Low Exchange Stiffness

Transitions in the magnetic domain morphology are observed as a function of sample thickness and temperature in several ferromagnet/heavy metal heterostructures with low exchange stiffness, appreciable perpendicular magnetic anisotropy, and moderate interfacial Dzyaloshinskii–Moriya interaction. Through micromagnetic and analytic modeling, it is demonstrated...

Current Detection and Energy Harvesting Integrated Magnetoelectric Sensor with Flexibility and Heat Resistance Based on Polylactide/VB2 Composites and FeCoV

A novel magnetoelectric current sensor (MCS) based on polylactide/VB2 composites and FeCoV is prepared using in-situ coating and poling-free methods, which endow good interfacial coupling between the piezoelectric and magnetostrictive layers. Benefiting from the non-ferroelectric PLLA/VB2 composites and flexible FeCoV, the MCS presents high flexibility,...

Governing Factors for Carbon Nanotube Dispersion in Organic Solvents Estimated by Machine Learning

The stable colloidal dispersion of carbon nanotubes in arbitrary organic solvents up to quantitative yields is achieved with the aid of commonplace polymers, which is applied for the preparation of composite materials exhibiting enhanced electrical and thermal conductivity. Complex driving forces for the efficient dispersion are stochastically estimated...

Darkening of Laser‐Induced Graphene in Wet for Readable In Situ Real Time Sweating Rate Analysis

Darkening of laser-induced graphene after wetting endows a very simple and effective avenue to visibly read out the in situ microfluidic flow rate. The assembled flexible platform is very appropriate for wearable human sweating rate analysis and more attractively the device is reusable with no special care needed but just drying the microchannel. ...

Hydroxy‐Group‐Enriched In2O3 Facilitates CO2 Electroreduction to Formate at Large Current Densities

Hexagonal phase In2O3 with enriched surface hydroxyl groups is prepared to feature efficient activation of CO2 and inhibition of carbonate formation, enabling long-time operation (>100 h) of CO2 electroreduction to formate under a constant current density of -150 mA cm−2. Abstract The development of catalysts and electrochemical systems for...

Virtual Infrared Display on Flexible and Transparent Substrate

Virtual IR images and videos that have shapes and colors similar to actual objects can be formed on a flexible and transparent near-infrared-to-long-wave-IR (NIR-to-LWIR) conversion film that emits LWIR after absorbing NIR. Abstract This study investigates a method of implementing virtual IR images, similar to the IR images of actual objects,...

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