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