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Most common catalyst particles are host to a complex network of pores and a substantial fraction of their actives sites may be embedded deep within. It is not always straightforward how reactant and product species diffuse in and out of the particle. The goal of this project is to develop fluorescent nanosensors that change color when exposed to particular chemical species. When incorporated inside a pore network, these nanosensors may be used to visualize complex diffusion dynamics by means of optical micro-spectroscopy.