Potassium ions (K+) are one of the most abundant ions in intracellular fluid, affecting a wide variety of cellular processes in living organisms. In humans, irregularities in extracellular K+ levels contribute to pathologies including cardiovascular disease, immunological diseases, and some cancers. Despite the role of K+ ions, the detection, quantification,...
Raman spectroscopy is an analytical technique that utilizes inelastic scattering of light to obtain structural information of analyte molecules. The weak intrinsic process of Raman scattering, however, can be greatly enhanced when molecules are placed on or near a surface of noble metal with nanostructures. Discovered over 40 years, surface-enhanced...