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Search results for raman dye

Nanophysics Oct 2, 2019

Quantizing single-molecule surface enhanced Raman Scattering with DNA origami metamolecules

Tailored metal nanoclusters can be actively developed in the lab to manipulate light at the subwavelength scale for nanophotonic applications. However, their precise molecular arrangement in a hotspot with fixed numbers and ...

General Âé¶¹ÒùÔºics Sep 6, 2019

Science puts historical claims to the test

The latest analytical techniques available to scientists can confirm the validity of historical sources in some cases, and suggest a need for reconsideration in others.

Optics & Photonics Jun 25, 2019

Designing light-harvesting organic semiconductor microcrystals with wavelength-tunable lasers

Organic solid-state lasers are essential for photonic applications, but current-driven lasers are a great challenge to develop in applied physics and materials science. While it is possible to create charge transfer complexes ...

Analytical Chemistry Jun 5, 2019

Painless skin patch collects fluid for diagnostic testing

Although blood contains a wealth of potential biomarkers of disease, it can be challenging to obtain and analyze. There's the anxiety patients experience when a large needle has to be stuck into a vein, and for many tests, ...

Analytical Chemistry Mar 29, 2019

Quantum physics and origami for the ultimate get-well card

Paper-based diagnostic tests are cheap, convenient and biodegradable. However, their use is limited by conventional dyes—which are not bright enough to show trace amounts of analyte, are prone to fading, and can be environmentally ...

Environment Jan 23, 2019

Determining the composition of microplastic in water

Âé¶¹ÒùÔºicists from Immanuel Kant Baltic Federal University have developed and applied a method of identifying microplastic collected in sea waters. The spectroscopy method determines the chemical composition of contaminants ...

Optics & Photonics Apr 10, 2018

Iridescent photonic cellulose, mimicking the structural color of insects, with optical applications

The bright colors of some butterflies, beetles or birds are not due to the presence of pigments that selectively absorb light, but due to the so-called structural coloration. Structural coloration occurs on surfaces with ...

Nanophysics Jan 2, 2018

Silver nanoparticles take spectroscopy to new dimension

As medicine and pharmacology investigate nanoscale processes, it has become increasingly important to identify and characterize different molecules. Raman spectroscopy, a technique that leverages the scattering of laser light ...

Materials Science Jul 25, 2017

Scientists equip chemical sensors with 'traps' to detect toxic substances

Scientists from Tomsk Polytechnic University and the University of Chemistry and Technology (Prague, Czech Republic) have created novel chemical sensors for Raman spectrometers, devices that measure the quantitative and qualitative ...

Engineering Jun 1, 2017

Single cells lined up like ducks in a row

The higher the concentration of tumor cells in the bloodstream, the greater the risk of metastasis. The number of circulating tumor cells indicates how well a patient is responding to therapy. Fraunhofer researchers have ...

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