Transcript Derivatization of Carbon Nanotubes by the semiconductor

Derivatization of Carbon
Nanotubes by the
ZnO and ZnS nanoparticles
Jerzy (George) Peszke
Jan Dlugosz University, Czestochowa, Poland
Leszek Stobinski
Polish Academy of Science, Warsaw, Poland
Hong – Ming Lin
Tatung University, Taipei, Taiwan
Structures of Carbon Nanotubes
SWNTs can be formed by rolling the
graphene sheet along lattice vectors
Structures of Carbon Nanotubes
Empty channel
Well
aligned
MWCNTs
Caps of MWCNTs
MWCNTs
Bamboo like
Bundled
SWCNTs
Physical Properties of Carbon Nanotubes
HOMO-LUMO Gap:
For (n, m); n-m is divisible by 3 [Metallic CNTs]
For (n, m); n-m is not divisible by 3 [Semiconducting CNTs]
0 - 0.1 eV
< 1 eV
Electrical Transport
Conductance Quantization
12.9 (kW)-1
Resistivity
10-4 W*cm
Maximum Current Density
1013 A/m2
Maximum Current Transmission
1GA/cm3
(copper wire ~1000 less)
Field emission on distance 1000 nm
1-3V
(molybdenum electrode on the same distance 50-100V)
Thermal Transport
Thermal Conductivity
Phonon Mean Free Path
Relaxation Time
Elastic Behaviour
Young's Modulus (SWNT)
Young's Modulus (MWNT)
(70 GPa for aluminium and 700 GPa for C-fibber)
Maximum Tensile Strength
(the high-grades steel are broken on ~2GPa)
~ 2000 W/m/K
~ 100 nm
~ 10-11 s
~ 1 TPa
1.28 TPa
~ 100 GPa
Chemical Properties of Carbon Nanotubes
Chemical Modification Carbon
Nanotubes
Chemical Modification Carbon
Nanotubes
CdSe / ZnS QD – about 700 atoms
Carbon Nanotubes modified by QDs via aminomorpholine
Carbon Nanotubes Modification
ZnS bonded with Carbon Nanotubes
MWCNTS bonded with ZnS through dodecylamine linker
ZnS bonded with Carbon Nanotubes
ZnS bonded with MWCNTs through 2-aminoethylthiol linker
ZnS bonded with Carbon Nanotubes
ZnS bonded with MWCNTs through 2-aminoethylmorpholine linker
ZnS bonded with Carbon Nanotubes
MWCNTS – COOH with ZnS nanoparticle
(MWCNTS – COOH – QD
model)
Carbon nanotubes complexes with ZnS
EDX spectra of
complexes MWCNTS
with ZnS
TEM images of
complexes
MWCNTS with
ZnS
Carbon nanotubes complexes with ZnO
Raman spectra of complexes
MWCNTS-COOH/ZnO (high
concentration of ZnO)
EDX spectra of complexes MWCNTS
with ZnO (low concentration of ZnO)
TEM images of complexes
MWCNTS with ZnO
(high concentration of ZnO)
Conclusions
• Physico-chemical properties of CNTs are determined
by their structure and purity
• Modifications of the CNTs geometry by attaching
different chemical functional groups to CNTs can
change their physical-chemical properties
• Modified CNTs are very promising starting material
for synthesis of new nano-materials (also as
templates)
• Designing of new nano-materials also requires their
structure modification
• XIXth century – century of water vapor,
XXth century – century of silicon,
XXIth century – century of nano-materials
Thank you for attention