Environmental Engineering Reference
In-Depth Information
(a)
e
-
CB
O
2
−•
e
-
CB
O
2
h
+
VB
H
2
O
h
+
VB
HO
·
Oxidation
Organics
(b)
e
-
Organics
CB
Oxidation
VB
h
+
figure 24.2
Charge transfer in (a) a coupled and (b) a capped semiconductor system.
Three-layered colloidal particles (such as CdS-HgS-CdS [22], Ag-TiO
2
-SiO
2
, Pt-TiO
2
-SiO
2
, or CdS-ZnO-CdO [7]) are
another development in the field of surface-modified semiconductor nanoparticles.
24.2.3.3 Organic-Inorganic Nanostructured Composites
in recent years, organic-inorganic materials have attracted
increasing research attention because of their potential usage as catalytic nanomaterials. Considerable effort has been under-
taken to incorporate organic components within an inorganic lattice to achieve symbiosis of the properties of both components.
For example, Braun et al. reported the synthesis of organic superlattices based on cadmium sulphide and cadmium sele-
nide [23]. Tenne et al. also synthesized inorganic WSe
2
and PtS
2
compounds, with a graphite-like crystal structure. These com-
pounds can be used to construct fullerene-like structures and nanotubes, which are promising candidates for applications in
catalysis [24].
