Reversible Electrochemical Modulation of a Catalytic Nanosystem |
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| Authors: | Dr Flavio della Sala Dr Jack L‐Y Chen Simona Ranallo Dr Denis Badocco Prof Dr Paolo Pastore Prof Dr Francesco Ricci Prof Dr Leonard J Prins |
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| Affiliation: | 1. Department of Chemical Sciences, University of Padova, Padova, Italy;2. Chemistry Department, University of Rome Tor Vergata, Rome, Italy |
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| Abstract: | A catalytic system based on monolayer‐functionalized gold nanoparticles (Au NPs) that can be electrochemically modulated and reversibly activated is reported. The catalytic activity relies on the presence of metal ions (Cd2+ and Cu2+), which can be complexed by the nanoparticle‐bound monolayer. This activates the system towards the catalytic cleavage of 2‐hydroxypropyl‐p‐nitrophenyl phosphate (HPNPP), which can be monitored by UV/Vis spectroscopy. It is shown that Cu2+ metal ions can be delivered to the system by applying an oxidative potential to an electrode on which Cu0 was deposited. By exploiting the different affinity of Cd2+ and Cu2+ ions for the monolayer, it was also possible to upregulate the catalytic activity after releasing Cu2+ from an electrode into a solution containing Cd2+. Finally, it is shown that the activity of this supramolecular nanosystem can be reversibly switched on or off by oxidizing/reducing Cu/Cu2+ ions under controlled conditions. |
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| Keywords: | gold nanoparticles nanocatalysis nanozymes supramolecular catalysis supramolecular chemistry |
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