An ultrastretchable, high-performance, and crosstalk-free proximity and pressure bimodal sensor based on ionic hydrogel fibers for human-machine interfaces.

The traditional human-machine interaction mode of communicating solely with pressure sensors needs modification, especially at a time when COVID-19 is circulating globally. Here, a transparent, stretchable, resilient, and high-performance hydrogel fiber-based bimodal sensor is fabricated by using a polyacrylamide-alginate double network hydrogel, which features high sensitivity (3.17% cm), wide working range (18 cm), fast response/recovery speeds (90/90 ms) and good stability in proximity sensing, and impressive pressure sensing performance, including high sensitivity (0.

Hydrogel- and organohydrogel-based stretchable, ultrasensitive, transparent, room-temperature and real-time NO sensors and the mechanism.

Highly stretchable, sensitive and room-temperature nitrogen dioxide (NO) sensors are fabricated by exploiting intrinsically stretchable, transparent and ion-conducting hydrogels and active metals as the novel transducing materials and electrodes, respectively. The NO sensor exhibits high sensitivity (60.02% ppm), ultralow theoretical limit of detection (6.

Environment tolerant, adaptable and stretchable organohydrogels: preparation, optimization, and applications.

Multiple stretchable materials have been successively developed and applied to wearable devices, soft robotics, and tissue engineering. Organohydrogels are currently being widely studied and formed by dispersing immiscible hydrophilic/hydrophobic polymer networks or only hydrophilic polymer networks in an organic/water solvent system. In particular, they can not only inherit and carry forward the merits of hydrogels, but also have some unique advantageous features, such as anti-freezing and water retention abilities, solvent resistance, adjustable surface wettability, and shape memory effect, which are conducive to the wide environmental adaptability and intelligent applications.

Ion-Conductive Hydrogel-Based Stretchable, Self-Healing, and Transparent NO Sensor with High Sensitivity and Selectivity at Room Temperature.

Here stretchable, self-healable, and transparent gas sensors based on salt-infiltrated hydrogels for high-performance NO sensing in both anaerobic environment and air at room temperature, are reported. The salt-infiltrated hydrogel displays high sensitivity to NO (119.9%/ppm), short response and recovery time (29.

Ultrasensitive, Stretchable, and Fast-Response Temperature Sensors Based on Hydrogel Films for Wearable Applications.

Conductive hydrogels can be used in wearable electronics integrated with skin, but the bulk structure of existing hydrogel-based temperature sensors limits the wearing comfort, response/recovery speeds, and sensitivity. Here, stretchable and transparent temperature sensors based on a novel thin-film sandwich structure (TFSS) are designed, which display unprecedented thermal sensitivity (24.54%/°C), fast response time (0.

Pyramid-Shaped Single-Crystalline Nanostructure of Molybdenum with Excellent Mechanical, Electrical, and Optical Properties.

Specific geometric morphology and improved crystalline properties are of great significance for the development of materials in micro-nano scale. However, for high-melting molybdenum (Mo), it is difficult to get high-quality structures exhibiting a single-crystalline nature and preconceived morphology simultaneously. In this paper, a pyramid-shaped single-crystalline Mo nanostructure was prepared through a thermal evaporation technique, as well as a series of experimental controls.

Green Synthesis of 3D Chemically Functionalized Graphene Hydrogel for High-Performance NH and NO Detection at Room Temperature.

To address the low gas sensitivity of pristine graphene (Gr), chemical modification of Gr has been proved as a promising route. However, the existing chemical functionalization method imposes the utilization of toxic chemicals, increasing the safety risk. Herein, vitamin C (VC)-modified reduced graphene hydrogel (V-RGOH) is synthesized via a green and facile self-assembly process with the assistance of biocompatible VC molecules for high-performance NH and NO detection.

Ultrasensitive and Stretchable Temperature Sensors Based on Thermally Stable and Self-Healing Organohydrogels.

It is essential to impart the thermal stability, high sensitivity, self-healing, and transparent attributes to the emerging wearable and stretchable electronics. Here, a facile solvent replacement strategy is exploited to introduce ethylene glycol/glycerol (Gly) in hydrogels for enhancing their thermal sensitivity and stability synchronously. For the first time, we find that the solvent plays a key role in the thermal sensitivity of hydrogels.

Three-Dimensional Graphene Hydrogel Decorated with SnO for High-Performance NO Sensing with Enhanced Immunity to Humidity.

A facile, one-step hydrothermal route was exploited to prepare SnO-decorated reduced graphene oxide hydrogel (SnO/RGOH) with three-dimensional (3D) porous structures for NO gas detection. Various material characterizations demonstrate the effective deoxygenation of graphene oxide and in situ growth of rutile SnO nanoparticles (NPs) on 3D RGOH. Compared with the pristine RGOH, the SnO/RGOH displayed much lower limit of detection (LOD) and an order of magnitude higher sensitivity, revealing the distinct impact of SnO NPs in improving the NO-sensing properties.

Multifunctional and High-Sensitive Sensor Capable of Detecting Humidity, Temperature, and Flow Stimuli Using an Integrated Microheater.

A multifunctional sensor comprising humidity, temperature, and flow detection capabilities is fabricated with a facile, single-layered device structure. A microheater based on serpentine Pt microlines plays key roles in both humidity and flow sensing at the hot state by introducing an efficient Joule heating effect, and meanwhile functions as a reliable thermistor at the cold state for accurate temperature measurement. For the first time, the strong temperature-dependent humidity-sensing properties of graphene oxide (GO) are revealed using the microheater platform.

Three-Dimensional-Structured Boron- and Nitrogen-Doped Graphene Hydrogel Enabling High-Sensitivity NO Detection at Room Temperature.

Heteroatom-doping has been proved as an effective method to modulate the electronic, physical, and chemical properties of graphene (Gr). Developing a new strategy of heteroatom-doping for high-performance gas sensing is a pivotal issue. Here, we demonstrate novel Gr-based gas sensors through three-dimensional (3D)-structured B-/N-doping nanomaterials for high-performance NO sensing.

The mechanism of action of the fragile histidine triad, Fhit: isolation of a covalent adenylyl enzyme and chemical rescue of H96G-Fhit.

The human fragile histidine triad protein Fhit catalyzes the Mg(2+)-dependent hydrolysis of P(1)-5'-O-adenosine-P(3)-5'-O-adenosine triphosphate, Ap(3)A, to AMP and ADP. The reaction is thought to follow a two-step mechanism, in which the complex of Ap(3)A and Mg(2+) reacts in the first step with His96 of the enzyme to form a covalent Fhit-AMP intermediate and release MgADP. In the second step, the intermediate Fhit-AMP undergoes hydrolysis to AMP and Fhit.