Structural breathing of graphite oxide pressurized in basic and acidic solutions
2011 (English)In: Journal of Physical Chemistry Letters, ISSN 1948-7185, Vol. 2, no 4, 309-313 p.Article in journal (Refereed) Published
Graphite oxide immersed in excess of basic or acidic water media was studied using synchrotron X-ray diffraction at high pressure using diamond anvil cells. The lattice spacing of graphite oxide in excess of NaOH solution increases by the enormous value of 85% at 1.6 GPa. In contrast, structure expansion of graphite oxide immersed in liquid water with added HCl is significantly less pronounced compared with compression in pure water. The point of media solidification correlated with a sharp decrease in graphite oxide layers separation because of partial withdrawal of water from the structure. Therefore, pressure-induced structural breathing of graphite oxide due to insertion/desertion of water into/from interlayer space is strongly enhanced in basic media and suppressed in acidic media. The magnitude of structural breathing also depends on relative amounts of graphite oxide powder and solution. Strongly diluted samples with low relative amount of graphite oxide powder in the suspension exhibited less pronounced high-pressure anomaly.
Place, publisher, year, edition, pages
American Chemical Society (ACS), 2011. Vol. 2, no 4, 309-313 p.
graphite oxide, water, lattice expansion, intercalation, solidification, diamond anvil cell, X-ray diffraction, XRD, high pressure, pH, acidic solution, basic solution
Condensed Matter Physics
Research subject Physics
IdentifiersURN: urn:nbn:se:umu:diva-39531DOI: 10.1021/jz1016476OAI: oai:DiVA.org:umu-39531DiVA: diva2:393515
FunderSwedish Research Council, 621-2010-3732
Supporting information available free at http://pubs.acs.org/2011-02-012011-01-312013-03-12Bibliographically approved