摘要：SummaryAs a key precursor for nitrogenous compounds and fertilizer, ammonia affects our lives in numerous ways. Rapid and sensitive detection of ammonia is essential, both in environmental monitoring and in process control for industrial production. Here we report a novel and nonperturbative method that allows rapid detection of ammonia at low concentrations, based on the all-optical detection of surface-enhanced Raman signals. We show that this simple and affordable approach enables ammonia probing at selected regions of interest with high spatial resolution, makingin situandoperandoobservations possible.Graphical AbstractDisplay OmittedHighlights•Novel method for detection of ammonia at concentrations below 1 ppm in just under 1 s•This approach allows local detection of ammonia amounts as low as 104–105molecules•Method for sensitive direct monitoring of catalytic/electrocatalytic processes•The method allows following the dynamics of ammonia concentration change in real timeChemistry; Chemical Engineering; Analytical Chemistry; Electrochemistry
