Table 1.

Structural parameters of Z3, Z5 and Z7

Sample	D (nm)	a (Å)	ρX(g/cc)	S(m2/g)	ρ(g/cm2)	P	Direct bandgap (eV)	Indirect bandgap (eV)
Z3	5.6	8.389	5.42	199.30	1.17	0.78	2.83	0.31
Z5	6.6	8.395	5.41	167.44	1.66	0.69	2.71	0.22
Z7	32.9	8.402	5.40	94.17	2.01	0.63	–	–