Structure-tunable supraparticle assemblies of hollow cupric oxide sheathed with nanographenes. Issue 3 (19th February 2020)

• Record Type: Journal Article
• Authors: Gu, Minsu; Lee, Woo-ram; Kim, Minkyung; Kang, Jiwoong; Lee, Jae Sung; Thompson, Levi T.; Kim, Byeong-Su
• Is Part Of: Nanoscale advances. Volume 2:Issue 3(2020)
• Page Start: 1236
• Page End: 1244
• Publication Date: 2020-02-19
• Subjects: 620.5
• DOI: 10.1039/d0na00031k
• Languages: English
• ISSNs: 2516-0230

Abstract

Abstract : Self-assembled supraparticles (SPs), a secondary structure of clustered nanoparticles of hollow Cu2 O SPs, were prepared using a cationic polyelectrolyte poly(diallyl dimethylammonium chloride) during the formation of Cu2 O nanoparticles. 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 Cu2 O SPs were prepared using a cationic polyelectrolyte poly(diallyl dimethylammonium chloride) (PDDA) during the formation of Cu2 O 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 Cu2 O 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 Cu2 O SPs. Subsequent thermal treatment to enhance the electrical conductivity of NGO within the NGO/Cu2 O SPs allows for the concomitant phase transformation of Cu2 O 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.