Table 2.

Preparation conditions and samples synthesized via hydrothermal route.

No.	Sample names	Concentration ratios of precursors ($C_{{\mathit{FeCl}}_3}$/$C_{\mathit{CTAB}})$	Hydrothermal treatment
1	Nanoparticle	$C_{{\mathit{FeCl}}_3}$/$C_{\mathit{CTAB}}=0.02/0.0$	120 °C—14 h, pH 10
2	Sphere	$C_{{\mathit{FeCl}}_3}$/$C_{\mathit{CTAB}}=0.02/0.01$	120 °C—14 h, pH 10
3	Rod	$C_{{\mathit{FeCl}}_3}$/$C_{\mathit{CTAB}}=0.05/0.01$	120 °C—14 h, pH 10
4	Rod/Cube	$C_{{\mathit{FeCl}}_3}$/$C_{\mathit{CTAB}}=0.05/0.02$	120 °C—14 h, pH 10
5	Cube	$C_{{\mathit{FeCl}}_3}$/$C_{\mathit{CTAB}}=0.05/0.04$	120 °C—14 h, pH 10
6	Broken cube	$C_{{\mathit{FeCl}}_3}$/$C_{\mathit{CTAB}}=0.07/0.04$	120 °C—14 h, pH 10
7	Polyhehral	$C_{{\mathit{FeCl}}_3}$/$C_{\mathit{CTAB}}=0.03/0.04$	120 °C—14 h, pH 10