Structure-tunable Supraparticle Assemblies of Hollow Cupric Oxide Sheathed with Nanographenes

Overview

Journal Nanoscale Adv

Publisher Royal Society of Chemistry

Specialty Biotechnology

Date 2022 Sep 22

PMID 36133034

Authors

Minsu Gu

Woo-Ram Lee

Minkyung Kim

Jiwoong Kang

Jae Sung Lee

Levi T Thompson

Byeong-Su Kim

Affiliations

Soon will be listed here.

Abstract

Self-assembled supraparticles (SPs), a secondary structure of clustered nanoparticles, have attracted considerable interest owing to their highly tunable structure, composition, and morphology from their primary nanoparticle constituents. In this study, hierarchically assembled hollow CuO SPs were prepared using a cationic polyelectrolyte poly(diallyl dimethylammonium chloride) (PDDA) during the formation of CuO nanoparticles. The concentration-dependent structural transformation of PDDA from linear chains to assembled droplets plays a crucial role in forming a hollow colloidal template, affording the self-assembly of CuO nanoparticles as a secondary surfactant. The use of the positively charged PDDA also affords negatively charged nanoscale graphene oxide (NGO), an electrical and mechanical supporter to uniformly coat the surface of the hollow CuO SPs. Subsequent thermal treatment to enhance the electrical conductivity of NGO within the NGO/CuO SPs allows for the concomitant phase transformation of CuO to CuO, affording reduced NGO/CuO (RNGO/CuO) SPs. The uniquely structured hollow RNGO/CuO SPs achieve improved electrochemical properties by providing enhanced electrical conductivity and electroactive surface area.

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