In situ managed and conformal coating of polydimethylsiloxane foams with silver nanoparticle networks with tunable piezo-resistive properties

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Nanoparticle–polymer composites maintain promise in enabling materials functionalities which can be troublesome to attain in any other case, but are hampered up to now by the scarce management and tunability of the nanoparticle collective properties on the polymer floor, particularly for polymer foams that includes a posh three-dimensional pore community. Right here we report on the managed and conformal in situ coating of polydimethylsiloxane (PDMS) foams with silver nanoparticles (AgNPs) with floor protection finely tunable over a wide range, from 0 to 75%, through the one-step room temperature discount of AgF instantly on the PDMS floor. This allows the design of AgNP electrical networks on the PDMS foam floor with piezo-resistive properties tunable as much as an element of 1000. We leveraged the management of the piezoresistive properties of the AgNP electrical community fashioned on PDMS foams to manufacture versatile and wearable stress sensors with sensitivity of 0.41 kPa−1, an operation vary >120 kPa, and a detection restrict of 25 Pa. As a proof-of-concept utility in wearable biomedical electronics, we efficiently used the sensors to watch the real-time radial artery pulse wave on the human wrist of a younger male with excessive decision.

Graphical abstract: In situ controlled and conformal coating of polydimethylsiloxane foams with silver nanoparticle networks with tunable piezo-resistive properties

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