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Papers
61,005 resultsShowing papers similar to Enhanced Sensitivity of 3D-printed Terahertz Metamaterials with a Vertical Gap Structure for Single Microplastic Particle Detection
ClearDetection of Polystyrene Microplastic Particles in Water Using Surface-Functionalized Terahertz Microfluidic Metamaterials
Researchers developed a surface-functionalized terahertz metamaterial microfluidic sensor for detecting polystyrene microplastic particles in water, demonstrating that microplastics captured at functionalized gap structures shift the resonant frequency of the metamaterial, enabling label-free detection with findings validated by finite-difference time-domain simulations.
Exploring the Application of Terahertz Metamaterials Based on Metallic Strip Structures in Detection of Reverse Micelles
Researchers developed terahertz metamaterial sensors based on microfluidic technology for detecting and characterizing microplastics in liquid samples. The approach offers high sensitivity for distinguishing polymer types based on their terahertz absorption signatures.
Excitation of high Q-factor Fano resonance in asymmetric THz metamaterial for microplastics sensing applications
Researchers designed a terahertz (THz) metasurface sensor — a structured material that interacts with light at microwave-like frequencies — achieving high sensitivity by exploiting a phenomenon called Fano resonance, which produces a very sharp detection signal. The sensor's high quality factor and stability across viewing angles make it well-suited for detecting and identifying microplastic particles by their unique optical signatures.
Ultra-compact quintuple-band terahertz metamaterial biosensor for enhanced blood cancer diagnostics
Engineers designed an advanced terahertz-frequency biosensor that can distinguish between normal blood cells and cancerous blood cells with high sensitivity. While not directly about microplastics, this type of sensor technology could potentially be adapted to detect nanoplastic particles in blood samples, advancing our ability to measure human exposure to plastic pollution.
Sub-6 GHz Microwave Sensor Targeting Microplastic Detection
Researchers designed an enhanced sub-6 GHz microwave sensor for low-cost microplastic detection by modifying sensor geometry to better utilize the bandwidth of portable microwave vector network analyzers. Electromagnetic simulations and experimental measurements validated the redesigned sensor, which calibrates resonant frequency as a function of effective permittivity to quantify microplastic concentrations in water.
Detection of Microplastic in Salts Using Terahertz Time-Domain Spectroscopy
Researchers demonstrated that terahertz spectroscopy can detect microplastics embedded in table salt at different concentrations. This technology could offer a new non-destructive method for screening food products for microplastic contamination.
Microfluidic Microwave Sensor for Rapid Detection of Microplastics in Water: Optimization, Modeling, and Performance Evaluation
Researchers developed a microfluidic sensor that uses microwave technology to rapidly detect microplastics in water samples without physical contact. The sensor was optimized to distinguish between different concentrations and sizes of plastic particles with high sensitivity. The technology could enable faster and more practical on-site monitoring of microplastic contamination in water supplies.
Rapid Differentiation between Microplastic Particles Using Integrated Microwave Cytometry with 3D Electrodes
Researchers developed a rapid microplastic identification system combining integrated microwave cytometry with 3D electrodes to differentiate single microparticles in the 14–20 micrometer range as they flow through a microfluidic channel. The system demonstrated the ability to distinguish particle types based on dielectric properties, offering a faster and flow-compatible alternative to conventional spectroscopic techniques for environmental microplastic monitoring.
Optical parameters extraction of soil and its microplastics contamination using terahertz spectroscopy
Researchers used terahertz spectroscopy to detect and quantify low-density polyethylene microplastics mixed into soil at different concentrations, finding that the technique could distinguish contaminated from clean soil based on changes in refractive index and signal attenuation. Terahertz spectroscopy is non-destructive and rapid, making it a potentially valuable tool for in-field soil microplastic screening without the need for laboratory extraction.
Size and concentration characterization of microplastic particles in aqueous samples using sensitivity-enhanced coupled planar microwave resonators
Researchers developed a novel microwave sensing platform for real-time detection and characterization of microplastic particles in water samples. The sensor uses an enhanced coupled planar microwave resonator design with a low-cost disposable sample holder, enabling rapid, non-destructive measurement of microplastic particle size and concentration without cross-contamination between tests.
Comparative Analysis of Sub-6 GHz Microwave Sensors Suitable for Low-Cost In-Situ Microplastic Detection
This engineering paper compares the performance of several microwave resonator sensor designs for detecting microplastics in water, motivated by the growing availability of low-cost handheld instruments. Laboratory tests showed meaningful differences in sensitivity between sensor geometries, with one design showing the highest relative frequency shift in response to a nylon sample. While purely technical, such sensor development work is an important step toward affordable, portable microplastic monitoring tools that could be deployed in rivers, tap water systems, or food processing facilities.
Study on Rapid Quantitative Detection of Soil MPs Based on Terahertz Time-Domain Spectroscopy
Researchers developed a rapid method for detecting and quantifying microplastics in soil using terahertz time-domain spectroscopy combined with machine learning algorithms. The classification models achieved high accuracy in identifying different types of microplastics including polyethylene, polystyrene, and polypropylene. The study suggests that terahertz spectroscopy could provide a faster and more efficient alternative to current methods for monitoring microplastic contamination in agricultural soils.
MicroMetaSense: Coupling Plasmonic Metasurfaces with Fluorescence for Enhanced Detection of Microplastics in Real Samples
The MicroMetaSense platform coupled plasmonic metasurfaces with fluorescence spectroscopy to achieve enhanced detection of microplastics, including particles smaller than 5 µm and nanoplastics below 1 µm. The approach overcame the detection limitations of existing methods, enabling sensitive MP identification in complex environmental and food matrices.
Detection of microplastics by microfluidic microwave sensing: An exploratory study
Researchers developed a compact microwave sensor on a microfluidic chip to detect microplastics in water samples. The system works by measuring how the presence of plastic particles changes the electrical properties of water. While the technology shows promise as a rapid and portable detection method, its current sensitivity needs improvement before it can detect the low microplastic concentrations typically found in natural freshwater.
Rapid Differentiation between Microplastic Particles Using Integrated Microwave Cytometry with 3D Electrodes
Researchers developed a microfluidic platform combining microwave capacitive sensing and resistive pulse sensing to rapidly differentiate between types of microplastic particles in liquid. Using 3D electrode arrangements, they successfully distinguished between polystyrene and polyethylene particles in the 10-24 micrometer range. The technology offers a promising approach for fast, flow-through microplastic detection in environmental water samples and biological fluids.
Monolithic Integration of Acoustic Enrichment and Resonant Sensing for Trace Detection of Micro-Plastics
Researchers developed a monolithic chip integrating acoustic enrichment and resonant mass sensing via a 3x3 piezoelectric micromachined resonator array, demonstrating particle focusing within 30 seconds and a significantly larger frequency shift for microplastic detection in seawater compared to random particle dispersion.
Development of a Compact and Portable Terahertz Imaging System for Industrial Applications
Researchers developed a compact, portable terahertz imaging device suitable for use outside the laboratory, demonstrating its ability to detect microplastics in soil among a range of other applications. While microplastic detection is one of several uses tested, the availability of low-cost, field-deployable detection technology could support faster and broader environmental monitoring of microplastic contamination.
Towards a fast and generalized microplastic quantification method in soil using terahertz spectroscopy
Researchers compared terahertz and near-infrared spectroscopy for quantifying microplastics in soil, finding that terahertz spectroscopy offered a faster and more accurate approach than NIR for distinguishing household microplastics from standard reference polymers in soil matrices.
Passive Disposable Microwave Sensor for Online Microplastic Contamination Monitoring
Researchers developed a passive disposable microwave sensor for online monitoring of microplastic contamination in water, using a sensitivity-enhanced planar dual-resonator tag-reader structure combined with a silicon resonator to enable non-contact concentration measurement.
Design and Testing of 3D-Printed Microfluidic Devices for Microplastic Monitoring
Researchers designed and tested a stereolithography 3D-printed microfluidic device with impedance spectroscopy electrodes for detecting microplastic particles in drinking water, demonstrating a low-cost fabrication approach for continuous microplastic monitoring systems.
High-sensitivity SERS sensor leveraging three-dimensional Ti3C2Tx/TiO2/W18O49 semiconductor heterostructures for reliable detection of trace micro/nanoplastics in environmental matrices
Researchers developed a new sensor that can detect trace amounts of micro- and nanoplastics in environmental samples like rainwater, soil, and wastewater. The sensor uses a layered semiconductor structure to enhance Raman spectroscopy signals, achieving high sensitivity and the ability to identify multiple plastic types at once. This technology could make it faster and more practical to monitor plastic pollution in real-world settings.
Meniscus‐Confined 3D Printed Nanoparticles: A Comparative Study of Quantitative SERS Detection of Microplastics
Detecting microplastics accurately in environmental samples is technically challenging, and this study introduces a new approach using 3D-printed silver and gold nanoparticle surfaces that amplify the light signal from microplastics when analyzed by Raman spectroscopy. Both types of printed substrates could detect plastic particles at concentrations as low as 0.3–1.2 micrograms per milliliter, with high reproducibility across dozens of repeated measurements. This technology could make routine, sensitive microplastic monitoring faster and more practical for environmental agencies and researchers.
RF MEMS Resonance Sensor for Measuring Microplastics Concentration
Researchers designed an RF MEMS resonance sensor capable of detecting microplastics in water at low cost, offering a practical alternative to expensive conventional particle analyzers for environmental monitoring.
Characterizations of high-density polyethylene by terahertz time-domain spectroscopy
Researchers characterized the optical properties of high-density polyethylene (HDPE) particles using terahertz time-domain spectroscopy and found the method can distinguish different particle sizes and filler contents. The technique can also detect how HDPE adsorbs other substances onto its surface. Terahertz spectroscopy could be developed as a rapid, non-destructive tool for identifying and characterizing HDPE microplastics in environmental samples.