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Morphology of pH‐sensing hybrid organic wires. a) Photograph of a free‐standing sample of fibers. b–d) SEM images. b) Random nonwoven mat of fibers. c) High‐magnification SEM image of an individual fiber carrying an embedded capsule. The fiber surface roughness, increasing in the capsule region, can be appreciated. d) Zoomed STEM image. Arrowheads indicate capsule‐based pH sensors. Inset: individual capsule.
