Raman shifts and assignments of GBP and BBP thin films.

GBP 2 mW Raman shift cm−1	BBP 2 mW Raman shift cm−1	Assignment	Reference
220	222	α-Fe2O3	226.7	26
286	290	α-Fe2O3	292.5	26
			299.3
398	406	α-Fe2O3	410.9	26 and 32
602	606	α-Fe2O3	611.9	26
642	651	FeO	652	26
	662	Fe3O4	662.7	32
1305	1317	α-Fe2O3	1320	26 and 32
1556	1567	Amorphous carbon	1575	23
		Sugar-derived carbon	1580	25