Time-Resolved Detection of Surface Oxide Formation at Individual Gold Nanoparticles: Role in Electrocatalysis and New Approach for Sizing by Electrochemical Impacts

Abstract

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Advanced electroanalytical chemistry at nanoelectrodes

“…Therefore, a high bandwidth system with high gain is essential to amplify the ultra-low current for further recording. 73 The trans-impedance amplifier (TIA) used for processing the current signal should have an ultra-low input bias current (usually <1 pA) to ensure high-resolution results (Fig. 3A).…”

“…Furthermore, the single nanoparticle landing experiments have been carried out using a scanning electrochemical cell microscopy (SECCM) configuration, 96–98 which ensures a time-resolved detection of the formation of a surface oxide at individual gold nanoparticles. 73 However, it should be noted that the destructive metal nanoparticle collision towards nanoelectrode/UME undergo complex electrochemical reactions rather than a one-step simple oxidation during the potentiostatic experiment. 82,99–101 As shown in Fig.…”

Impact and oxidation of single silver nanoparticles at electrode surfaces: one shot versus multiple events

“…Hence, the SECCM platform has been used successfully for single-entity electrochemical measurements such as monitoring the electrodeposition of single NPs, 39,40 electrochemical detection of single molecules 41 and, most recently, the time-resolved detection of single NP electrocatalytic impacts, 14 including surface oxide formation on noble material (Au) NPs. 42 An advantage of the SECCM approach is that there is no need for an encapsulated collector electrode, so that a wide range of electrode materials can be used for this purpose, including materials with low noise characteristics.…”

The Influence of Supporting Ions on the Electrochemical Detection of Individual Silver Nanoparticles: Understanding the Shape and Frequency of Current Transients in Nano‐impacts

“…[22][23][24] Here, the charge transfer of electrons from the nanoparticle to the electrode is measureda sadistinct spike in current-time traces. [29] For freely diffusing nanoparticles, the frequency of oxidation events is limited by the diffusive mass transport of particles to the electrode surface and therefore by the electrode size. [25] Furthermore, calculation of the total charge,w hich is transferred per spike, yields in principle information about the particle volume [26][27][28] or surface area.…”