Secondary Nanotubes and Fills
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Transcript of Secondary Nanotubes and Fills
Secondary Nanotubes and Fills
C-NT
V3O7 - NR
Al2O3
MoO3
RuO2
ZrO2
carbon
TiO2
Ga2O3
BaTiO3
PbTiO3
G. Patzke, F. Krumeich, R. Nesper, Angew. Chem. 2002, 114, 2554
on in
onTiO2
SiO2
inFe
Composite Nanotubes
tube walls comprise well-developed layers of PbS nanoparticles that are embedded in the organic matrix structure
Self-assembly in a colloid containing PbS nanoparticles, a polymer (poly(ethylene oxide)), and a surfactant (sodiumdodecylsulfate)
Silica Nanotubes
Hippe, Wark, Lork, Schulz-Ekloff, Microp. Mesop. Mater. 31 (1999) 235
[Pt(NH3)4(HCO3)2 single crystals
coated by SiO2 and TiO2
through Si(OEt)4 or Ti(OEt)4
Pt
Template-assisted Synthesis of Nanotubes
Rod-like Template
Coating of anisotopically structured template with a second material
Removal of template
Caruso, Antonietti, Chem. Mater. 13 (2001) 3272
Nanotube
Next steps
J. Zygmunt, F. Krumeich, R. Nesper, Adv. Mater. 2003, 15, 1538
Wires of V3O7·H2O
Silica nanotubes
1 m
Intermediate product
TEM
Silica Nanotubes
V map
Si map
Template-assisted Synthesis of Nanotubes
Topotactic redox reactions of copper(II) and iron(III) salts within VOx Nanotubes
Novel Cu- and Fe-containing nanotubes of composition
VO1.53-2.1(C12H28N)0.21Cu0.08(H2O)0.56Cl0.01 and
VO2.08-2.68 (C12H28N)0.13Fe0.19(H2O)0.33Cl0.01
have been obtained by exchange of the protonated template in dodecylamine-VOx nanotubes with Cu(II) and Fe(III) salts. The exchanged materials have quite different characteristics in respect to the parent nanotubes, namely a wider inner diameter and thinner walls, owing to reduced interlayer spacings in their multiwalled structure.
SiO2 tubes –TiO2 coated
SiO2 tubes –Fe2O3 coated
Triple layer rods1. VOx fibers 2. SiO2 tubes 3. carbon coating
Multiple Coatings
Asbestos - C coated
Iron oxide rods-
C coated