Single
entity electrochemistry (SEE) has emerged as a promising
method for precise measurement and fundamental understanding of the
heterogeneity of single entities. Herein, we propose the dual responsive
SEE sensing of the silver nanoparticles (AgNPs) collisions through
a wireless nanopore electrode (WNE). Given the high temporal resolution
and low background noise features, the Faradaic and capacitive currents
provide the AgNPs’ collision response. The electron transfer
between the AgNPs and the electrode surface is identified under a
bipolar electrochemical mechanism. Compared to the ultramicroelectrode,
multistep oxidation of 30 nm AgNPs is observed due to the decreased
interaction of the nanoparticles to the electrode. Moreover, the nanoconfinement
of WNE plays a vital role in the repeated capturing of nanoparticles
from the nontunneling region into the tunneling region until a complete
oxidation. As a comparison, the collision of 5 nm AgNPs with higher
interaction at the electrode surface shows great decrease in the multistep
events. Thus, we propose a nanoconfined interaction based SEE method
which could be used for simultaneously capturing the Faradaic and
capacitive response. The nanoconfined interaction based SEE method
holds great promise in the better understanding of heterogeneity
of single particles.
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