Tracking motion trajectories of individual nanoparticles using time-resolved current traces

Abstract

We report experiments and simulations demonstrating that multiple distinct motion trajectories of individual nanoparticles can be discerned from time-resolved current traces.

Unveiling the Intrinsic Catalytic Activities of Single‐Gold‐Nanoparticle‐Based Enzyme Mimetics

“…[32][33][34][35][36][37] Stochastic collision electrochemical measurements have been widely applied in many applications ranging from electrocatalytic amplification and direct electrochemical stripping of individual metal NPs to soft particles and blocking detection of biologically relevant samples. [32][33][34][35][36][37] Stochastic collision electrochemical measurements have been widely applied in many applications ranging from electrocatalytic amplification and direct electrochemical stripping of individual metal NPs to soft particles and blocking detection of biologically relevant samples.…”

Various Current Responses of Single Silver Nanoparticle Collisions on a Gold Ultramicroelectrode Depending on the Collision Conditions

“…Indeed, the oxidationo fA gt ot he aqueous Ag ion by the oxidation of Ag NP was previously reported in an Ag NP collisione xperiment, albeit using ad ifferent electrolyte solution. [7,12,13,[27][28][29][30] We also tested the reactivity of Ag oxide powder for the hydrazine and found that Ag 2 Or eacted with hydrazine (see the Supporting Information). Therefore, the decay of the blip response at 0.80 Vm ay be due to the combination of self-oxidation of Ag NP and recovery of the blockede lectrode surface.…”

“…The NP size and concentration are proportional to the magnitude and frequency of the current signal, respectively.T herefore, analysis of the current signals can provide information about the concentrationa nd size distribution of NPs. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] These kinds of observation and analyses of singleN Pc ollisionh aveb een adapted from an earlier study about this topic using Pt, [1,2] IrO x, [3,4] Au, [5,6] Ag, [7] and Cu [8] NPs. These detection techniques share common features such as the availabilitieso ft he amperometric, [1][2][3][4][5] potentiometric, [9] or coulometric [6] measurements for successful single NP collision detection in various single NP collision systems.…”

“…There have been few studies about the analysisoft he shape of the current signal to understands ingleN Pcollisionp henomena. [8,[10][11][12][13] The current signal of as ingle NP collision can vary depending on the collision environment and subsequent behavior.T od ate, the relevant criteria for single NP collision experiments have usually been the staircase response and blip responseo ft he current signal. The results indicated ifferent phenomenao fs ingle NP collision.…”

A 30 nm Nanopore Electrode: Facile Fabrication and Direct Insights into the Intrinsic Feature of Single Nanoparticle Collisions

“…[13][14][15][16] Single-nanoparticle electrochemistry is attracting increasing attention to explore the fundamental features of nanoparticles.T wo detection strategies have been widely applied to convert single particle properties into acurrent signal. [16,20,21] Theo ther is single nanoparticle immobilization, which immobilizes as ingle nanoparticle on an UME surface for electrocatalytic study. [16,20,21] Theo ther is single nanoparticle immobilization, which immobilizes as ingle nanoparticle on an UME surface for electrocatalytic study.…”