Kazan Federal University Digital Repository

Stage Transitions in Graphite Intercalation Compounds: Role of the Graphite Structure

Show simple item record

dc.contributor.author Dimiev A.
dc.contributor.author Shukhina K.
dc.contributor.author Behabtu N.
dc.contributor.author Pasquali M.
dc.contributor.author Tour J.
dc.date.accessioned 2020-01-21T20:53:11Z
dc.date.available 2020-01-21T20:53:11Z
dc.date.issued 2019
dc.identifier.issn 1932-7447
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/157822
dc.description.abstract © 2019 American Chemical Society. Despite intensive and long-lasting research on graphite intercalation compounds (GIC), the mechanism of the stage transitions remains unclear. Using optical and Raman microscopy, we perform direct real-time monitoring of stage transitions in H2SO4-GICs made from highly oriented pyrolitic graphite (HOPG). We observe that stage transitions in HOPG-based GICs occur very differently from those in GICs made from the natural flake graphite. During the stage-2 to stage-1 transition, formation of the stage-2 phase begins nearly simultaneously over the entire graphite surface that is exposed to the media. We attribute this concerted transition to the movement of the small intercalant portions toward the points of attraction, thus growing continuous islands. During the reverse process, the stage-1 to stage-2 transition begins strictly from the edges of the graphite sample and propagates toward the center of the graphite sample. The deintercalation front is discontinuous; the selected micrometer-sized domains of the graphite surface deintercalate preferentially to release the strain that had been induced by the intercalation. The intercalant dynamics in the two-dimensional (2D) graphite galleries, occurring at the speed > 240 μm/s, has fast kinetics. The initial intercalation process is different from the rest of the reintercalation cycles. The difference in the mechanisms of the stage transitions in natural flake graphite-based GICs and in the HOPG-based GICs exemplifies the role of the graphite structure for the intercalant dynamics in 2D graphite galleries.
dc.relation.ispartofseries Journal of Physical Chemistry C
dc.title Stage Transitions in Graphite Intercalation Compounds: Role of the Graphite Structure
dc.type Article
dc.relation.ispartofseries-issue 31
dc.relation.ispartofseries-volume 123
dc.collection Публикации сотрудников КФУ
dc.relation.startpage 19246
dc.source.id SCOPUS19327447-2019-123-31-SID85070685488

Files in this item

This item appears in the following Collection(s)

  • Публикации сотрудников КФУ Scopus [22633]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

Show simple item record

Search DSpace

Advanced Search


My Account