We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
MXene-supported AgNPs in smart hydrogels: Shrink-enabled amplification for high-performance multi-channel SERS sensing.
Summary
Researchers developed a MXene-supported silver nanoparticle smart hydrogel wearable sensor that exploits hydrogel shrinkage upon ethanol exposure for signal amplification, enabling high-sensitivity multi-channel detection. The platform was proposed for health monitoring applications requiring flexible, sensitive biosensing.
BACKGROUND: With the advancement of technology and growing health concerns, high sensitivity, flexibility, and multi-channel detection have become crucial indicators for wearable intelligent sensors. RESULTS: Inspired by the volume contraction of hydrogels upon ethanol exposure, a strategy combining MXene with in situ reduction of silver nanoparticles has been used to construct a three-dimensional, high-sensitivity SERS substrate (MX-SNP PAH-based SERS substrate). This design not only enriches target molecules but also enables dual enhancement of charge transfer and electromagnetic enhancement by inducing inter-particle spacing between silver nanoparticles and VCT. The developed SERS substrate allows for the quantitative analysis of pesticide molecules (thiram, 1 nM), small molecules such as p-mercaptobenzoic acid (pMBA, 1 nM), and microplastics like polystyrene (PS, 6.25 μg mL). Additionally, by analyzing the sweat SERS spectra, it was possible to successfully quantify blood glucose levels (4.5 mM). SIGNIFICANCE: This innovative MX-SNP PAH-based SERS substrate design provides valuable insights for the development of flexible wearable sensors, with significant application potential in food safety, water quality analysis, and health monitoring.
Sign in to start a discussion.
More Papers Like This
Highly Scalable, Wearable Surface‐Enhanced Raman Spectroscopy
Researchers developed highly scalable wearable surface-enhanced Raman spectroscopy (SERS) sensors capable of detecting molecular-level chemical information from the skin, advancing the field of non-invasive chemical sensing with potential applications in environmental exposure monitoring.
Flexible ThermoelectricAg Film/PEDOT:PSS/AgNPs Composites:Toward Universal and Ultrasensitive Sensing
Researchers integrated thermoelectric PEDOT:PSS with silver nanoparticles and silver films to construct a flexible SERS platform, demonstrating that the thermoelectric field actively modulates AgNP carrier concentration to boost both chemical and electromagnetic Raman enhancement. The platform achieved microplastic detection limits of 0.005% and SARS-CoV-2 spike protein detection at 10^-8 M, with the thermoelectric effect enabling active performance regulation.
Recent Implementations of Hydrogel-Based Microbial Electrochemical Technologies (METs) in Sensing Applications
This systematic review found that hydrogel-based microbial electrochemical technologies show strong potential for biosensor applications, particularly in detecting water contaminants and monitoring environmental quality. Hydrogels improve biofilm stability and electrode performance in microbial fuel cells used as sensing platforms.
Flexible Thermoelectric Ag Film/PEDOT:PSS/AgNPs Composites: Toward Universal and Ultrasensitive Sensing
Researchers developed a multifunctional flexible SERS substrate by integrating thermoelectric PEDOT:PSS with silver nanoparticles and silver films, finding that the thermoelectric field modulated carrier concentration in AgNPs to enhance chemical and electromagnetic Raman sensitivity. The optimised composite achieved detection limits of 0.005% for microplastics and 10^-8 M for SARS-CoV-2 spike protein, demonstrating broad ultrasensitive sensing capability.
SERS Detection of Hydrophobic Molecules: Thio-β-Cyclodextrin-Driven Rapid Self-Assembly of Uniform Silver Nanoparticle Monolayers and Analyte Trapping
A thio-β-cyclodextrin-mediated self-assembly protocol created compact silver nanoparticle monolayers at oil/water interfaces within 40 seconds, enabling high-sensitivity SERS detection of hydrophobic molecules by entrapping analytes within plasmonic hotspots.