Table 2.

Parameters deduced from Gaussian fits of surface plasmon resonance peaks from different α-Cu_2±xSe NCs.

Sample No.	Sample name	λsp(nm)	ωsp(s−1)	γ (s−1)	ωp(s−1)	Nc(cm−3)
S5	Cu1.8Se	1246	2.41 × 1014	4.64 × 1013	2.20 × 1015	5.94 × 1020
S6	Cu2Se	1253	2.39 × 1014	6.36 × 1013	2.15 × 1015	5.67 × 1020
S7	Cu2.5Se	1206	2.49 × 1014	4.64 × 1013	2.24 × 1015	6.16 × 1020
S8	Cu2.7Se	1070	2.80 × 1014	3.12 × 1013	2.52 × 1015	7.79 × 1020
S9	Cu1.3Se	1225	2.45 × 1014	3.4 × 1013	2.47 × 1015	7.49 × 1020