Tuneable pressure effects in graphene oxide layers.

ABSTRACT: Tuneable pressure effects associated with changing interlayer distances in two-dimensional graphene oxide (GO)/reduced GO (rGO) layers are demonstrated through monitoring the changes in the spin-crossover (SCO) temperature (T _1/2) of [Fe(Htrz)₂(trz)](BF₄) nanoparticles (NPs) incorporated in the interlayer spaces of the GO/rGO layers. The interlayer separation along the GO to GO/rGO-NP composites to rGO series decreases smoothly from 9.00?Å (for GO) to 3.50?Å (for rGO) as the temperature employed for the thermal reduction treatments of the GO-NP composites is increased. At the same time, T _1/2 increases from 351?K to 362?K along the series. This T _1/2 increment of 11?K corresponds to that observed for pristine [Fe(Htrz)₂(trz)](BF₄) NPs under a hydrostatic pressure of 38?MPa. The influence of the stacked layer structures on the pseudo-pressure effects has been further probed by investigating the differences in T _1/2 for [Fe(Htrz)₂(trz)](BF₄) that is present in the composite as larger bulk particles rather than as NPs.

SUBMITTER: Sekimoto Y 

PROVIDER: S-EPMC5610342 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature