Table 3. Electrical conductivity σ, resistivity ρ, carrier concentration n, carrier mobility μ, Hall coefficient R_H and f factor of CCO@xZnO samples at 300 K.

Sample	σ (S cm−1)	ρ (Ω cm−1)	n (1019 cm−3)	μ (cm2 V−1 S−1)	R H (cm−3 C−1)	f
CCO	28.186	0.035	1.962	8.979	0.319	0.975
CCO@0.1ZnO	33.378	0.030	2.159	9.663	0.289	0.998
CCO@0.3ZnO	35.677	0.028	2.247	9.923	0.278	0.997
CCO@0.5ZnO	37.021	0.027	2.887	8.031	0.217	0.998
CCO@0.7ZnO	37.604	0.027	3.288	7.148	0.190	0.981