Raman parameters of the GPLs in the GPL/Ti composites.

GPLs content	ν D	ν G	ν 2D	I D/IG	I 2D/IG
0.25 vol%	1339	1576	2712	0.77	0.57
0.5 vol%	1338	1583	2715	0.70	0.58
1.0 vol%	1337	1585	2717	0.63	0.58
1.5 vol%	1337	1585	2729	0.63	0.64
2.0 vol%	1336	1583	2731	0.60	0.72