Table 3. Atomic percentages of different carbon bonds indentified by XPS in the pristine CNTs and different as-produced GNRs.

Sample	C/O	C1s (at%)	C-O (at%)	C=O (at%)	COOH (at%)
P	24.00	89.97	10.03	0	0
A	19.00	83.24	11.57	5.19	0
B	2.50	56.94	35.17	6.28	1.61
C	2.20	55.21	34.72	7.14	2.93
D	2.90	60.60	30.93	6.46	2.01