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- W2334859939 abstract "Electrochemical–atomic force microscopy (AFM-SECM) was used to simultaneously probe the physical and electrochemical properties of individual ∼20 nm sized gold nanoparticles functionalized by redox-labeled PEG chains. The redox PEGylated nanoparticles were assembled onto a gold electrode surface, forming a random nanoarray, and interrogated in situ by a combined AFM-SECM nanoelectrode probe. We show that, in this so-called mediator-tethered (Mt) mode, AFM-SECM affords the nanometer resolution required for resolving the position of individual nanoparticles and measuring their size, while simultaneously electrochemically directly contacting the redox-PEG chains they bear. The dual measurement of the size and current response of single nanoparticles uniquely allows the statistical distribution in grafting density of PEG on the nanoparticles to be determined and correlated to the nanoparticle diameter. Moreover, because of its high spatial resolution, Mt/AFM-SECM allows “visualizing” simultaneously but independently the PEG corona and the gold core of individual nanoparticles. Beyond demonstrating the achievement of single-nanoparticle resolution using an electrochemical microscopy technique, the results reported here also pave the way toward using Mt/AFM-SECM for imaging nano-objects bearing any kind of suitably redox-labeled (bio)macromolecules." @default.
- W2334859939 created "2016-06-24" @default.
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- W2334859939 date "2013-04-12" @default.
- W2334859939 modified "2023-09-29" @default.
- W2334859939 title "Probing Individual Redox PEGylated Gold Nanoparticles by Electrochemical–Atomic Force Microscopy" @default.
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- W2334859939 doi "https://doi.org/10.1021/nn400527u" @default.
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