Probing Dynamic Events of Dielectric Nanoparticles by a Nanoelectrode‐Nanopore Nanopipette. Issue 20 (7th May 2018)

• Record Type: Journal Article
• Authors: Pandey, Popular; Panday, Namuna; Chang, Shuai; Pang, Pei; Garcia, Javier; Wang, Xuewen; Fu, Qiang; He, Jin
• Is Part Of: ChemElectroChem. Volume 5:Issue 20(2018)
• Page Start: 3102
• Page End: 3112
• Publication Date: 2018-05-07
• Subjects: analytical methods -- nanoparticles -- nanopore -- nanotechnology -- single-entity analysis; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.201800163
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: In recent years, various single‐entity electrochemical methods have been developed to study the dynamic events of single nanoparticles (NPs) in solution. It has been demonstrated that the assembly, transport, and translocation of metallic NPs near a nanopore entrance can be detected based on the open‐circuit potential change of a floating nanoelectrode placed near the nanopore. In this study, we applied the nanopore‐nanoelectrode‐based method to study polystyrene (PS) NPs with various sizes, which were used as the model dielectric NPs. Furthermore, by utilizing dielectrophoretic (DEP) force applied through the nanoelectrode, PS NPs can be efficiently preconcentrated to form large assemblies outside the nanopipette tip, enabling high‐throughput single NP analysis. We revealed how the interactions between NPs and between the NP and the nanopore surface affected the current and potential signals. We investigated the dynamic structures and motions of PS NPs inside the large assembly based on the complementary and correlated the ionic current and potential signals from both the nanopore and the nanoelectrode. We also compared the difference in the dynamic events between polarizable metallic NPs and non‐polarizable dielectric NPs during multi‐NP structure formation and individual NP transport and translocation motions. Abstract : Looking nano : It is demonstrated that the nanopore‐ and nanoelectrode‐based single‐entity approach can be used to study the dynamic assembly of dielectric nanoparticles in electrolyte.