Scalable Fabrication of Highly Organized, Horizontally Aligned Sub‐5 nm Silicon Nanowires via Chemical Vapor Etching

Small Science, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 28, 2025

Herein, the scalable fabrication of hierarchical silicon structures featuring high‐density, horizontally super‐aligned sub‐5 nm nanowires (SiNWs), is reported. These unprecedented, highly organized architectures with tunable sizes and densities are fabricated using straightforward micro‐patterned SiO 2 /Si templates followed by a chemical vaporetching process. In time‐resolved structural analysis, it revealed that rapid, aggressive etching crucial for creating an inhomogeneous spatial distribution vapor etchants, inducing surface defects acting as preferential sites localized anisotropic along <111> direction. The efficacy this unique structure demonstrated single‐molecule detectable surface‐enhanced Raman scattering sensor, incorporating sub‐10 silver plasmonic nanoparticles. Its distinct features—marked quantum‐confined dimensions, ultrahigh area, dual‐scale roughness, exceptional uniformity—enable significant enhancement optical response detection sensitivity down to 10 −11 m . controlled SiNW architecture can broaden applications quantum in bio‐sensing other emerging technologies.

Language: Английский

---

Imidazole-triggered in situ fluorescence reaction system for quantitatively determination of dopamine from multiple sources

Talanta, Journal Year: 2025, Volume and Issue: unknown, P. 127975 - 127975

Published: March 1, 2025

Language: Английский

---

Analyzing Functionalized Carbon Quantum Dots in Electrode Engineering for the Precise Electrochemical Detection of a Neurotransmitter: Achieving Laboratory Accuracy with Portable Sensors

ACS Sensors, Journal Year: 2025, Volume and Issue: unknown

Published: April 22, 2025

Point-of-care testing (POCT) devices are revolutionizing health monitoring by enabling rapid and accessible outside conventional laboratory environments. However, achieving laboratory-level accuracy in these portable continues to pose a significant challenge. This study introduces e-Patram, an innovative paper-based POCT sensor specifically designed for the precise efficient of dopamine (DA) urine, critical biomarker neurological health. Regular DA is essential identifying fluctuations that may signal neurodegenerative conditions, such as Parkinson's disease, e-Patram aspires facilitate early detection through noninvasive testing. The utilizes electrochemical methods attain high selectivity DA, even presence common interfering substances like ascorbic acid (AA) uric (UA), which often present urine can complicate due close value their redox potential with DA. By overcoming interference challenges modification electrode, provides reliable measurements comparable standard "catecholamine test." Extensive validation human samples confirms device's precision consistency, underscoring its practical tool routine both clinical everyday settings.

Language: Английский

---

The Efficient and Sensitive Detection of Serum Dopamine Based on a MOF-199/Ag@Au Composite SERS Sensing Structure

Chemosensors, Journal Year: 2024, Volume and Issue: 12(9), P. 187 - 187

Published: Sept. 13, 2024

In this study, a MOF-199/Ag@Au SERS sensing structure was successfully synthesized by combining metal–organic frameworks (MOFs) with surface-enhanced Raman scattering (SERS) technology for the efficient detection of dopamine (DA), biomarker neurological diseases, in serum. Using electrochemical methods, copper-based MOF (MOF-199) situ on copper substrates and further deposited silver nanoparticles (AgNPs). Subsequently, gold nanoshells were encapsulated around these cores chemical deposition. This preparation process is simple, controllable, inexpensive. Furthermore, novel Azo reaction-based DA method proposed to detect 1 pM DA, which represents an improvement sensitivity two orders magnitude compared previous unlabeled methods four another approach work. There excellent linear relationship (R2 = 0.976) between signal at 1140 cm−1 concentration (0.001 M~1 pM). The results indicate that sensor can achieve both qualitative quantitative serum, thus providing robust technical basis application field clinical disease screening.

Language: Английский

---

Enhanced Sensitivity and Homogeneity of SERS Signals on Plasmonic Substrate When Coupled to Paper Spray Ionization–Mass Spectrometry

Chemosensors, Journal Year: 2024, Volume and Issue: 12(9), P. 175 - 175

Published: Sept. 2, 2024

This work reports on the development of an analyte sampling strategy a plasmonic substrate to amplify detection capability dual analytical system, paper spray ionization–mass spectrometry (PSI-MS) and surface-enhanced Raman spectroscopy (SERS). While simply applying only solution results in limited degree SERS enhancement, introduction gold nanoparticles (AuNPs) greatly improves signals without sacrificing PSI-MS sensitivity. It is initially revealed that concentration AuNPs type analytes highly influence their variations due “coffee ring effect” flow mechanism induced during interfacial interactions (e.g., van der Waals, electrostatic, covalent) between analyte. Subsequent PSI treatment at high voltage conditions further impacts overall responses, where signal sensitivity homogeneity significantly increase throughout entire substrate, suggesting ready migration adsorbed regardless attractive forces. The PSI-induced notable enhancements are presumably associated with creating unique for local aggregation induce effective couplings hot spots (i.e., electromagnetic effect) repositioning close proximity surface polarizability chemical effect). optimized also applicable multi-analyte analysis by MS, enhanced uniformity.

Language: Английский

---

Hybrid SERS sensor using Ag nanoparticles on laser-induced graphene for detection of prohibited additives for aquaculture

Applied Surface Science, Journal Year: 2024, Volume and Issue: 682, P. 161754 - 161754

Published: Nov. 9, 2024

Language: Английский

---

A Review on SERS-based Techniques for Mycotoxin Detection: From Construction to Application

TrAC Trends in Analytical Chemistry, Journal Year: 2024, Volume and Issue: unknown, P. 118120 - 118120

Published: Dec. 1, 2024

Language: Английский

---