We report on a label-free microfluidic immunosensor with femtomolar sensitivity and high selectivity for early detection of epidermal growth factor receptor 2 (EGFR2 or ErbB2) proteins. This sensor utilizes uniquely structured immunoelectrode made porous hierarchical graphene foam (GF) modified electrospun carbon-doped titanium dioxide nanofibers (nTiO2) as an electrochemical working electrode. Due to excellent biocompatibility, intrinsic surface defects, reaction kinetics, good stability...

Ionic transition-metal complex (iTMCs)-based electro-luminescent nanofibers (TELFs) are developed by using coelectrospinning. A single TELF consists of a Galistan liquid metal core (cathode), an iTMC-based polymer shell, and ITO thin film coating (anode). Lights emitted from the TELFs can be detected CCD camera at 4.2 V seen naked eyes 5.6 in nitrogen. The structurally self-supporting but do not require physical substrate (generally relatively bulky heavy) to support them, rendering...

Abstract This paper reports a flexible and stretchable metamaterial-based “skin” or meta-skin with tunable frequency selective cloaking effects in microwave regime. The is composed of an array liquid metallic split ring resonators (SRRs) embedded elastomer. When stretched, the performs as surface wide resonance tuning range. wrapped around curved dielectric material, functions “cloaking” to significantly suppress scattering from material along different directions. We studied responses...

Abstract This paper reports on a simple and versatile method for patterning transferring graphene‐based nanomaterials onto various types of tape to realize flexible microscale sensors. The involves drop‐casting graphene film prepatterned polydimethylsiloxane (PDMS) surface containing negative features by suspensions, applying Scotch remove the excess from nonpatterned areas PDMS surface, then patterned inside at target tape. feature size transferred patterns final is as small few...

Soil monitoring is emerging as a key factor to manage smart farming which has been recommended have economical food safety and security. Among various development for example internet of things assisted farming, electrochemical sensing system are getting popularity via detecting one or multiple soil component effectively, efficiently, selectively quality assessment remotely data sharing site location just like point-of-care heath care. Considering scenarios, this perspective designed...

There is an unmet need for improved fertilizer management in agriculture. Continuous monitoring of soil nitrate would address this need. This paper reports all-solid-state miniature potentiometric sensor that works direct contact with soils to monitor nitrate-nitrogen (NO3--N) solution parts-per-million (ppm) resolution. A working electrode formed from a novel nanocomposite poly(3-octyl-thiophene) and molybdenum disulfide (POT-MoS2) coated on patterned Au covered nitrate-selective membrane...

We present a microelectromechanical system (MEMS) graphene-based pressure sensor realized by transferring large area, few-layered graphene on suspended silicon nitride thin membrane perforated periodic array of micro-through-holes. Each through-hole is covered circular drum-like layer, namely "microdrum". The uniqueness the design fact that introducing arrays into supporting allows generating an increased strain in over local deformations holes under applied differential pressure. Further...

Methanol is a major volatile organic compound (VOC) emitted from plants. emission reflects indirect plant defense against insects, promotes cell-to-cell communication, and adapts plants to various environmental stresses. This paper reports wearable sensor that can monitor methanol directly on the leaf of under field conditions with low cost, high portability, easy installation use. The technology eliminates need for complex sampling, expensive instruments, skilled operators conventional gas...

Abstract This study presents a wearable plant tattoo sensor array designed for continuous monitoring of leaf temperature, relative water content, and biopotential. Current technologies often require relatively bulky substrates support adhesives attachment, which potentially can hinder growth affect long‐term measurements. The multifunctional overcomes these issues by adhering directly to the surface without need additional supporting structures or glues. includes biopotential electrode,...

A vertical microfluidic plant chip technology is developed to establish a powerful experimental framework for high-throughput and precise phenotyping.

It is challenging to integrate porous graphene foam (GF) and GF-based nanocomposites into microfluidic channels even create structures within these materials. This because their irregular interior pore shape geometry, rough exterior surface, relatively large material thickness make it difficult perform conventional photolithography etching. challenge has largely hindered the potential of using materials in microfluidics-based sensors. Here we present a simple approach well-defined...

This paper reports on all-flexible strain sensors made of graphene, microfluidic liquid metal, and stretchable elastomer. These graphene feature a flexible wiring design, where metal is introduced into channels for inside the devices. design allows enhanced overall structural flexibility reduced risk stress-related mechanical failure sensors, at contact areas between sensing elements wires. A unidirectional sensor multidirectional rosette are developed, by encasing patterned with We...

Abstract This work presents a wearable sensor for real‐time on‐leaf monitoring of relative humidity (RH), temperature, and vapor‐pressure deficit (VPD) plants in both controlled environments under field conditions. is flexible conformable to the leaf surface. By integrating graphene‐based RH sensing element gold‐based thin‐film thermistor on polyimide sheet, allows accurate continuous determination VPD at surface, thereby providing information plant transpiration. A greenhouse experiment...

Background For successful aging-in-place strategy development, in-home monitoring technology is necessary as a new home modification strategy. Monitoring an older adult’s daily physical activity at can positively impact their health and well-being by providing valuable information about functional, cognitive, social status. However, it questionable how these technologies have changed the traditional residential environment. A comprehensive review of existing research findings should be...

Variable-focus cylindrical liquid/liquid microlenses and spherical liquid microlens arrays formed using interfaces are actuated by thermoresponsive hydrogels (see figure). The shapes of the realized patterning apertures with corresponding shapes. Hydrogels located within microfluidic channels regulate focal lengths expanding contracting, in response to changes environmental temperature. Supporting information for this article is available on WWW under...

Reconfigurable metamaterials have great potential to alleviate complications involved in using passive realize emerging electromagnetic functions, such as dynamical filtering, sensing, and cloaking. This paper presents a new type of tunable meta-atoms the X-band frequency range (8–12 GHz) toward reconfigurable metamaterials. The meta-atom is made all flexible materials compliant surface an interaction object. It uses liquid metal-based split-ring resonator its core constituent embedded...

The musculoskeletal tissues are highly ordered nanostructured materials, and they have self-healing capability. However, when the tissue damage is beyond capability, therapeutic approaches to repair or regenerate needed. Nanomaterials attracted much research attention create novel engineering scaffolds, because of their small size, large surface area, enhanced mechanical properties, tunable molecular chemical structures, various functionalities. With development nanotechnology, materials...

This letter reports on a fully conformal square-patch frequency-selective surface (FSS) consisting of liquid metal alloy embedded within flexible silicone elastomer. The and elastic nature the FSS provides high conformity to doubly curved surfaces. transmission properties both singly surfaces are studied. can facilitate electromagnetic interference reduction in X-band frequency range when wrapped cylindrical or spherical radomes over dipole-like antennas, thus surpassing many existing...

This paper investigates the optical bound states in continuum (BIC) supported by a slotted high-contrast grating (sHCG) structure. The sHCG structure consists of periodic array silicon ridges with slot each ridge. Given that BICs are perfectly confined, their spectral locations identified using finite-element method formulated from generalized eigenvalue problem. real eigenvalues represent wavelengths BIC modes and associated eigenvectors correspond to electric field distributions. In...

Sensitive detection and accurate diagnosis/prognosis of glioma remain urgent challenges. Herein, dispersed magnetic covalent organic framework nanospheres (MCOF) with uniformed Fe3O4 nano-assembly as cores high-crystalline COF shells were prepared by monomer-mediated in-situ interface growth strategy. Based on the unique interaction between MCOF hairpin DNA, a fluorescent signal amplified miRNA biosensor was constructed. It could realize sensitive miRNA-182 in different matrixes, where...

In this paper, DC transformer based on IGCT and lossless buffer capacitor (IGCT-DCT) transient control for IGCT-DCT; are proposed. IGCT-DCT, the loss of zero voltage switching (ZVS)under light load or no is solved through soft converter modulation (SCM) minimum backflow power injection, can greatly reduce turned-off IGCT. As a result, approximately IGCT-DCT achieve greater capacity. However, when step performed under SCM, large bias current will be generated, which affect ZVS IGCT, result in...

This study introduces a plant sensor utilizing an array of microneedles to monitor hydrogen peroxide (H2O2) in tobacco and soybean plants under biotic stress response. The microneedle features biohydrogel layer composed the natural biopolymer chitosan (Cs) reduced graphene oxide (rGO), functionalized with horseradish peroxidase (HRP) (HRP/Cs-rGO). HRP/Cs-rGO combines biocompatibility, hydrophilicity, porosity, electron transfer ability, making it suitable bioelectrode material for...