Abstract
Three-dimensional (3D) nanostructures of α-Fe
2
O
3
materials
, including both hollow sphere-shaped and
yolk-shell
(
core-shell
)-shaped, have been successfully synthesized via an environmentally friendly hydrothermal approach. By expertly adjusting the reaction time, the solid, hollow, and
yolk-shell
shaped α-Fe
2
O
3
can be selectively synthesized.
Yolk-shell
α-Fe
2
O
3
nanospheres
display outer diameters of 350 nm, and the interstitial hollow spaces layer is intimately sandwiched between the inner and outer
shell
of α-Fe
2
O
3
nanostructures. The possible growth mechanism of the
yolk-shell
nanostructure is proposed. The results showed that the well-defined bilayer interface effectively enhanced the
sensing
performance of the α-Fe
2
O
3
nanostructures (i.e.,
yolk-shell
α-Fe
2
O
3
@α-Fe
2
O
3
), owing predominantly to the unique nanostructure, thus facilitated the transport rate and augmented the adsorption quantity of the target
gas
molecule under
gas detection
.
Keywords
