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lab:research:graphyne-01 [2014/11/09 01:35] 127.0.0.1 external edit |
lab:research:graphyne-01 [2014/12/17 15:35] rawoon |
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==== Thermal expansion of graphyne ==== | ==== Thermal expansion of graphyne ==== | ||
- | We have investigated the thermal expansion behaviors of graphyne blah | + | We have investigated the thermal expansion behaviors of three different types (α, β, and γ) of graphyne |
- | blah | + | which is a two-dimensional carbon allotrope composed of //sp// and //sp<sup>2</sup>// bonds. |
- | + | We have found that all three types of graphyne exhibit negative in-plane thermal expansion. | |
+ | The observed in-plane thermal contraction can be attributed to the ripple effect, similarly in graphene. However, | ||
+ | the ripple effect itself is not sufficient to explain anomalously larger thermal contraction found in graphyne than in graphene. | ||
+ | Our deliberate analysis on the phonon modes observed in graphyne enables us to discover another source causing such amplified contraction behavior. | ||
+ | We found that there are particular phonon modes with frequencies around a few hundreds of cm<sup>-1</sup> existing exclusively in | ||
+ | graphyne that may fill empty spaces resulting in area reduction. | ||
+ | These modes are attributed to the libration of "rigid units" composed of triple bonds |