Kwon Group, Physics, Kyung Hee University

User Tools

Site Tools



This shows you the differences between two versions of the page.

Link to this comparison view

Next revision
Previous revision
Last revision Both sides next revision
lab:research:graphyne-01 [2014/11/09 01:35] external edit
lab:research:graphyne-01 [2014/12/17 15:35]
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</​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
lab/research/graphyne-01.txt · Last modified: 2015/12/24 00:34 by ykkwon