Plasmonics is combined with polymer synthesis for rapid fabrication of highly fluorescing silver quantum cluster/polymer composites inside microfluidic channels. UV-light assisted synthesis of polymers has been investigated by a number of groups previously [1], however, plasmon assisted synthesis has not been presented before. This should allow highly localized fabrication of porous polymers that are defined by the location of the nanoplasmonic metal film. Silver quantum clusters (AgQCs) consisting of 2-10 atoms can be highly fluorescing in the visible wavelength range and possess a greater photostability than organic fluorophores [2]. In this work AgQCs are embedded into the oligoaniline porous matrix and is tested for indirect fluorescence detection of cyanide in a simple microfluidic device (Fig. 1). Imaging of individual silver clusters inside the channel (Fig. 1) is made possible by using 100x oil-immersion microscopy through a ∼100 μm thick glass lid of the chip, while the bottom substrate contains the plasmonic silver nanoparticle film.