Table 1.

The top 10 most productive countries regarding nanomaterial and GC research from 2004 to 2023

Rank	Country	Counts	Percentage	Total citations	H-Index
1	China	524	66.08	13,251	73
2	Iran	91	11.48	1339	22
3	USA	57	7.19	2286	26
4	South Korea	54	6.81	1129	20
5	Japan	51	6.43	1976	22
6	India	32	4.04	472	12
7	England	14	1.77	602	8
8	Spain	13	1.64	832	10
9	Israel	11	1.39	800	7
10	Italy	11	1.39	418	6