# Kwon Group, Physics, Kyung Hee University

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lab:research:graphyne-01

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 lab:research:graphyne-01 [2014/11/09 01:35]127.0.0.1 external edit lab:research:graphyne-01 [2015/12/24 00:34]ykkwon 2015/12/24 00:34 ykkwon 2014/12/17 15:35 rawoon 2014/12/17 15:35 rawoon 2014/11/09 01:35 external edit Go Next revision Previous revision 2015/12/24 00:34 ykkwon 2014/12/17 15:35 rawoon 2014/12/17 15:35 rawoon 2014/11/09 01:35 external edit Go Line 1: Line 1: ==== 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//​ 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​ 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 + {{page>:​lab:​publications:​2015:​cwkim-2015&​nofooter&​noeditbtn}}
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