Table 1. Size, Shape, and LSPR Peak of Cu_2–xS NCs Obtained from Different Concentrations of PEI.

sample	PEI (mg/mL)	aspect ratio	shape	LSPR peak (nm)
A	0.032	1.1 ± 0.2	dot	1148
B	0.096	1.2 ± 0.2	dot	1145
C	0.160	2.2 ± 0.3	dot and short rod	1145
D	0.224	3.0 ± 0.5	dot and short rod	1143
E	0.320	2.8 ± 0.2	dot and short rod	1189
F	0.750	5.7 ± 0.7	nanorod	1231
G	1.000	6.0 ± 0.5	nanorod	1277
H	1.280	6.5 ± 0.5	nanorod	1323
I	1.600	7.5 ± 0.5	nanorod	1369