Ripplocation in graphite nanoplatelets during sonication assisted liquid phase exfoliation

Abstract

Defects induced by liquid-phase exfoliation of graphite using sonication were studied. It was shown that localized impact by cavitation shock waves can produce bulk ripplocations and various types of dislocations in graphite nanoplatelets. Formation of ripples is more pronounced in large aspect (length/width) ratio platelets or nanobelts. Quasi-periodical ripple systems were observed in many nanobelts after sonication. Mechanism of formation of ripples and dislocations during sonication was proposed. Surprisingly, fast high-temperature processing was found to anneal most of defects. This is consistent with our observations that defects associated with ripplocations are strongly localized and thus can be fast annealed. (Stanislav Moshkalev)

Growth of GaAs nanowire–graphite nanoplatelet hybrid structures

“…GNPs were obtained by liquid phase chemically assisted sonication-induced exfoliation of natural graphite description. The exfoliation and the following thermal defect "healing" were similar to the methods reported in 23 . The detailed analysis of individual GNPs (crystal structure, morphology, electrical properties) was reported in our previous works 23,59 and revealed the presence of rare oxygen impurities.…”

“…The exfoliation and the following thermal defect "healing" were similar to the methods reported in 23 . The detailed analysis of individual GNPs (crystal structure, morphology, electrical properties) was reported in our previous works 23,59 and revealed the presence of rare oxygen impurities. It was also demonstrated that during the exfoliation some ripplocations and dislocations could form in GNPs.…”

“…It was also demonstrated that during the exfoliation some ripplocations and dislocations could form in GNPs. However, the annealing process was shown to eliminate most of these defects 23 .…”

“…Meanwhile, almost no attention was attracted to the NW growth on graphite nanoplatelets (GNPs). GNPs are low defect graphitic surfaces with lateral sizes of few microns and thickness of tens of monolayers (MLs) which can be deposited on almost any substrate, including silicon, without complex processing with coverage up to centimeter range or more [22][23][24][25] . Such nanomaterials are attractive due to their planar structure, lightweight, high aspect ratio, electrical conductivity, low cost, mechanical toughness.…”

Combined Pressure Sensor With Enhanced Dynamic Range Based on Thin Films of Nanotubes and Graphite Nanobelts

“…The procedure of film deposition was repeated 4 times (followed by 4 h drying at normal condition after each deposition) in the case of GNBs. A high degree of crystallinity was proved by Raman measurements for both GNBs and MWCNTs films (Supplementary Figure S1, see detailed characterization in (Obiedkov et al, 2012;Alaferdov et al, 2018Alaferdov et al, , 2020).…”