Nanobubble-assisted formation of carbon nanostructures on basal plane highly ordered pyrolytic graphite exposed to aqueous media

0341532 - ÚFCH JH 2011 RIV GB eng J - Journal Article
Janda, Pavel - Frank, Otakar - Bastl, Zdeněk - Klementová, Mariana - Tarábková, Hana - Kavan, Ladislav
Nanobubble-assisted formation of carbon nanostructures on basal plane highly ordered pyrolytic graphite exposed to aqueous media.
Nanotechnology. Roč. 21, č. 9 (2010), 095707. ISSN 0957-4484. E-ISSN 1361-6528
R&D Projects: GA MŠMT LC510; GA AV ČR IAA400400804; GA AV ČR KAN200100801
Institutional research plan: CEZ:AV0Z40400503; CEZ:AV0Z40320502
Keywords : scanning tunneling microscopy * hydrophobic surfaces * Raman spectroscopy
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 3.644, year: 2010

Ambient gas nanobubbles of size similar to 10(1)-10(2) nm occupying the hydrophobic surface of basal plane highly ordered pyrolytic graphite (HOPG) immersed in aqueous media at room temperature cause exfoliation of the top graphene layers, as revealed by both in situ and ex situ atomic force microscope (AFM) imaging. The formation of nanoparticles composed mostly from graphene-based nanoscrolls, nanohorn-like and onion-like nanostructures was resolved by high resolution transmission electron microscopy (TEM) and examined by diffraction and x-ray photoelectron spectroscopy (XPS) analyses. The diameter of nanostructures varied from about 5 nm for single-layered scrolls to tens of nanometres for multishells. Raman spectroscopy confirmed the structural rearrangement of the HOPG basal plane after the above-mentioned treatment. The implications for nanobubble interfacial forces are discussed.
Permanent Link: http://hdl.handle.net/11104/0184480