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To develop simple optical pH sensors with adequate sensitivity, short response time, and extended life time for the analysis of very small sample volumes, high concentrations of pH sensitive indicator dyes were encapsulated into ∼200 nm diameter nanocapsules (NCs) with ∼1 nm thick porous walls. The capsules were immobilized into high‐porosity polyvinyl alcohol (PVA) gels for robust and versatile sensor...
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