Electrochemically controlled winding and unwinding of substrate-supported carbon nanoscrolls

0487730 - ÚFCH JH 2019 RIV GB eng J - Journal Article
Tarábková, Hana - Zelinger, Zdeněk - Janda, Pavel
Electrochemically controlled winding and unwinding of substrate-supported carbon nanoscrolls.
Physical Chemistry Chemical Physics. Roč. 20, č. 8 (2018), s. 5900-5908. ISSN 1463-9076. E-ISSN 1463-9084
R&D Projects: GA ČR(CZ) GA17-05167s
Institutional support: RVO:61388955
Keywords : electrochemistry * carbon nanoscrolls * electrical energy
OECD category: Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)
Impact factor: 3.567, year: 2018

Carbon nanoscrolls (CNSs) formed spontaneously on the basal plane of highly ordered pyrolytic graphite (HOPG) show winding and unwinding movements when potential steps from 0 V to0.5 V,0.6 V and0.9 V are applied on HOPG immersed in an aqueous electrolyte solution (0.1 M H 2 SO 4 ). Reversible changes in CNS radial dimensions exceeding 10 nm in the axial direction and 50 nm in the lateral direction are ascribed to variations in the surface tension and electric double-layer structure under applied potentials. Radial motion is observed exclusively on scrolled tube-shaped nanostructures, while other parts of the HOPG surface including planar areas, simple bended and lifted step edges, and kinks remain intact. The mechanism explaining the observed phenomenon is proposed and its significance for prospective applications in electrochemically controlled nanomechanical actuators is outlined.
Permanent Link: http://hdl.handle.net/11104/0282364