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Fabrication of pH‐sensing wires. a) Sketch showing the conjugation of the ratiometric fluorescent pH indicator dye SNARF‐1 to nonfluorescent aminodextran. b) Schematic representation of a capsule‐based pH sensor (carrying SNARF‐1‐dextran conjugate in the cavity) and SEM image showing the wires obtained via electrospinning. c) Schematic view of the response of a pH‐sensing hybrid wire to the local environment. Objects are not drawn to scale.
