Photochemistry Aspects of the Laser Pyrolysis Addressing the Preparation of Oxide Semiconductor Photocatalysts

Table 2

Synthesis parameters and crystallographic parameters of nanoTiO₂ particles.

Sample	Φair^∗ [sccm]	ΦC2H4^∗ (TiCl4) [sccm]	TiO2-phase proportion^**		Lattice parameters^**				D Mean crystallite dimension [nm]
			A (%)	R (%)	A (JCPDS 21-1272)		R (JCPDS 21-1272)		A	R
					a = 3.785 Å		a = 4.593 Å
					c = 9.513 Å		c = 2.959 Å
					a (Å)	c (Å)	a (Å)	c (Å)
SN	10 (N2O)	100	64.1	35.9	3.805	9.56	4.70	2.92	14.4	4.2
SA	50	100	74.6	25.4	3.81	9.57	4.64	2.965	17.8	15.0
S0	150	100	92.3	7.7	3.81	9.55	4.63	2.95	18.9	21.4

^*Φ_C2H4 and Φ_air, are the flows of the ethylene (carrier of Fe(CO)₅ vapors) and of the air oxidizer, respectively (in standard cubic centimeter per minute);^**A and R stand for anatase and rutile, respectively; a and c are the values of the lattice parameters of titania, according to standard JCPDS 21-1272 data.