A novel self-powered photodetector based on reduced graphene oxide (rGO)/n-Si p-n vertical heterojunction with high sensitivity and fast response time is presented. The contains a between drop-casted rGO thin film n-Si. Contacts the semiconductor layer (rGO, n-Si) source-drain Ti/Au electrodes allow efficient transfer of photogenerated charge carriers. UV-near infrared shows toward spectrum light from 365 to 1200 nm. Under 600 nm illumination (0.81 mW cm-2 ), device has photoresponsivity...

Abstract Living systems can respond to external stimuli by dynamic interface changes. Moreover, natural wrinkle structures allow the surface switch dynamically and reversibly from flat rough in response specific stimuli. Artificial have been developed for applications such as optical devices, mechanical sensors, microfluidic devices. However, chemical molecule‐triggered flexible sensors based on wrinkling not demonstrated. Inspired human skin wrinkling, herein, a volatile organic compound...

Electrical conductive metal-organic frameworks (EC-MOFs) are emerging as an appealing class of highly tailorable electrically conducting materials with potential applications in optoelectronics. Here, we situ grew nickel hexahydroxytriphenylene (Ni-CAT) on the surface ZnO nanorods (NRs). The self-powered photodetectors (PDs) were fabricated heterojunctions formed at interface NRs and Ni-CAT. With this, built-in electric field (BEF) can effectively separate photogenerated electron-hole pairs...

Synthetic pyrethroid insecticides are chiral compounds with multiple asymmetric positions. In this study, isomers of four commonly used pyrethroids were separated at the enantiomeric level by enantioselective high-performance liquid chromatography (HPLC), and differences between enantiomers in aquatic toxicity characterized using individual isomers. Isomers cis-bifenthrin permethrin completely resolved on a Sumichiral OA-2500-I column. All eight cypermethrin cyfluthrin two chained Chirex...

Synthetic pyrethroids contain two or three chiral centers, making them a family of pesticides with large number stereoisomers. Recent studies showed significant differences in aquatic toxicity between enantiomers from the same diastereomers pyrethroids. To better understand ecotoxicological effect and fate pyrethroid insecticides, chirality biodegradation must also be considered. In this study, we examined enantiomer compositions selected field sediment samples taken various locations...

1D nanoscale photodetectors have been extensively investigated for the unique geometry structure and novel physical chemical properties. The CdS materials received much attention in field due to its high photosensitivity fast response, while how achieve responsivity is still development, despite it crucial target excellent photodetector. Single crystal nanorods (NRs) are synthesized on SiO 2 /Si substrate over large scale via vapor deposition method. individual single nanorod photodetector...

Heterostructured metal oxides with large specific surface area are crucial for constructing gas sensors high performance. However, using slurry-coating and screen-printing methods to fabricate cannot result in uniformity reproducibility of the sensors. Here, NiO nanowalls decorated by SnO2 nanoneedles (NiO@SnO2) were situ grown on ceramic microchips via a chemical bath deposition method detect H2S instead print-coating methods. The morphologies compositions NiO@SnO2 hierarchical...

This study reported a novel humidity-insensitive nitrogen dioxide (NO 2 ) gas sensor based on tin (SnO )/reduced graphene oxide (rGO) composites through the sol-gel method. The demonstrated ppb-level NO detection in p-type sensing behaviors (13.6% response to 750 ppb). Because of synergistic effect SnO /rGO p-n heterojunction, performance was greatly enhanced compared that bare rGO. limit sensors as low 6.7 ppb under dry air. Moreover, benefited from formed superhydrophobic structure...

Synthetic pyrethroids are chiral compounds consisting of multiple stereoisomers. Evaluation enantioselectivity in environmental fate and ecotoxicity requires analytical methods that preserve stereoisomer integrity during analysis. In this study, we characterized the stability stereoisomers from four commonly used pyrethroids, cis-bifenthrin (cis-BF), permethrin (PM), cypermethrin (CP), cyfluthrin (CF), gas chromatography (GC) analysis sample preparation. Stereoisomers cis-BF PM were found to...

Contamination of surface aquatic systems by insecticides is an emerging concern in urban watersheds, but sources contamination are poorly understood, hindering development regulatory or mitigation strategies. Hardscapes such as concrete surfaces considered important facilitator for pesticide runoff following applications around homes. However, behavior on has seldom been studied, and standardized evaluation methods nonexistent. In the present study, a simple batch method measuring wash-off...

Adsorption and degradation behavior of a pesticide in soil has strong effect on its environmental fate as well efficacy for pest control. Fosthiazate is an organophosphate compound that currently under development nonfumigant nematicide. In this study, we evaluated adsorption kinetics fosthiazate three U.S. soils with different properties. mineral was negligibly weak but appeared to increase organic matter (OM) content. The half-life (T1/2) ranged from 0.5 1.5 months nonsterile prolonged 1−3...

A self-powered gas sensor activated by visible light which can detect trace concentrations of molecules without an external power source.

Abstract Manufacture of large-scale patterned nanomaterials via top-down techniques, such as printing and slurry coating, have been used for fabrication miniaturized gas sensors. However, the reproducibility uniformity sensors in wafer-scale are still a challenge. In this work, “top-down” “bottom-up” combined strategy was proposed to manufacture wafer-scaled with high-throughput by in-situ growth Ni(OH) 2 nanowalls at specific locations. First, micro-hotplate based sensor chips were...

All synthetic pyrethroids are chiral compounds, and isomerization has been frequently observed from exposure to certain solvents. However, so far, pyrethroid caused by solvents not characterized at the enantiomer level. In this study, we evaluated occurrence of enantiomerization two commonly used pyrethroids, permethrin cypermethrin, in various organic solvent-water systems. The four stereoisomers were stable under all test conditions. Rapid cypermethrin was isopropanol methanol but...

Gallium nitride (GaN) is a superior candidate material for fabricating ultraviolet (UV) photodetectors (PDs) by taking advantage of its attractive wide bandgap (3.4 eV) and stable chemical physical properties. However, the performance available GaN-based UV PDs (e.g., in terms detectivity sensitivity) still require improvement. Fabricating nanoporous GaN (porous-GaN) structures constructing organic/inorganic hybrids are two effective ways to improve PDs. In this study, novel self-powered PD...

Chirality occurs widely in synthetic pyrethroids. Studies have shown significant differences both aquatic toxicity and degradation rates between enantiomers from the same diastereomer of selected To better understand chiral selectivity biodegradation pyrethroids, 14C-labeled permethrin was used to characterize enantiomeric formation transformation intermediates two soils a sediment. Individual were spiked into soil sediment samples, products identified with known standards....

Isomerization induced by light, heat, and organic solvents has been shown to occur for some pyrethroid insecticides. Alcohols are popular that used in sample extraction, storage, analysis. Thus, alcohol-induced epimerization may contribute the incorrect interpretation of results from enantioselective chemical analysis bioassay pyrethroids like cypermethrin. In this study, we investigated relationship between rate cypermethrin stereoisomers: 1R-cis-αR 1R-trans-αR short-chain alkyl alcohol...

Abstract Plasticizers are commonly utilized as packaging additives in the food service industry. The takeaway sector provides convenience to consumers, but also raises risk of human exposure plasticizers. goal this study is determine amount phthalates and compare migration amounts under various situations. A comprehensive health impact assessment was conducted provide evaluation human's daily phthalates. results revealed that five (di (2‐ethylhexyl) phthalate (DEHP), butyl benzyl (BBP),...

Ultrathin free-standing graphene oxide (GO) films were fabricated by vacuum filtration method assisted with Ni(OH)2 nanosheets as the sacrifice layer. The surface of obtained GO film is very clean can be thoroughly etched HCl. thickness well-controlled changing volume dispersion, and thinnest reached ~12 nm. As a novel transparent dielectric material, has been applied layer for flexible touchless capacitive sensor which effectively distinguish approaching an insulator or conductor.

Current artificial muscle technology necessitates a significant technological advancement to increase bending strain, enhance response rates, and prolong stability while ensuring consistent reliable performance across various stimuli.