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Self-Assembled 10 nm-Nanogap Arrays With High-Density Hot Spot Distribution for Environmental Pollutant Detection
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Scientists have developed an inexpensive, highly sensitive sensor that can detect tiny traces of chemical pollutants and even nanoplastic particles, like those found in everyday products, at extremely low concentrations. This matters because microplastics and industrial dyes are increasingly showing up in our water, food, and bodies, and better detection tools like this one could help researchers and regulators track and address these contaminants before they cause harm. The technology itself doesn't yet tell us about health effects, but it's a promising step toward monitoring the pollution we're exposed to.
Abstract Environmental pollutants, including organic dyes and plastic, have posed severe threats to the health of our ecosystem. Although a lot of efforts have been made to tackle this problem, these pollutants are still massively produced during industrial activities as well as human life. The ability to detect these environmental pollutants with high sensitivity is thus greatly desired. Herein, we propose a novel surface-enhanced Raman spectroscopy (SERS) substrate with high-density hot spots, high Raman signal enhancement, and good uniformity for trace detection of organic pollutants and nanoplastic. The SERS substrates consist of abundant ultranarrow nanogaps that are fabricated with cost-effective colloidal lithography. With the significantly enhanced near-field intensity, rhodamine 6G (R6G) molecules as low as 10−8 M can be detected with good linear correlations between the signal intensity and molecular concentrations. Moreover, both nanowells and nanogaps are present on the SERS substrates fabricated by our method and the nanowells could be used to trap micro- or nanoplastic. We successfully demonstrate detecting polystyrene (PS) nanospheres (200 nm in diameter) with different concentrations (1.000% to 0.001%), showing the potential to detect micro- or nanoplastic pollutants in the environment. Our method provides a feasible approach to fabricating low-cost SERS substrates for the detection of organic pollutants and nanoplastic.
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Scientists have developed a tiny chip that can detect trace amounts of dissolved contaminants and micro/nanoplastics in water faster, cheaper, and more sensitively than current methods—down to parts-per-billion levels in under a minute. This matters because better, more affordable water testing could help catch pollution and plastic contamination before it builds up in our drinking water and, ultimately, in our bodies.
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Scientists have invented a new light-based sensor that can detect tiny plastic particles, smaller than 500 nanometers, far too small to see, by trapping them in specially designed nanoscale pockets and identifying their shape and plastic type using color signals. This matters because nanoplastics can carry toxic chemicals and are increasingly found in our food, water, and even our bodies, but until now they've been extremely hard to detect and study. This new tool could help researchers track these hidden pollutants more quickly and accurately, which is a key step toward understanding their real risks to human health.
UltrasensitiveDetection of Macromolecules in WaterVia Flowing Nanoparticles on a Microchip
AI summary Read the abstract
Scientists have created a tiny chip that can detect trace amounts of contaminants—including microplastics and other invisible particles—in water faster and cheaper than current methods, catching them at incredibly low concentrations (parts per billion) in under a minute. This matters because it could lead to more affordable, widespread water testing tools, helping catch contamination in drinking water before it becomes a bigger health concern.
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