Aqueous Microlenses for Localized Collection and Enhanced Raman Spectroscopy of Gaseous Molecules

Raman spectroscopy of gaseous molecules has been challenging, requiring complicated experimental procedures and peripheral devices for concentrating the analytes. Here, Raman spectroscopy of gaseous molecules at parts‐per‐billion (ppb) levels is demonstrated using aqueous microlenses of LiCl solution that spontaneously absorb water‐soluble gas molecules from the environment. The lenses are easily formed by filling the microwells of an...