Carbon nanotube
synthesis by laser vaporization and chemical vapor deposition
Pulsed Laser Deposition
of thin films
Gas-phase nanoparticle
formation
NEW Watching nanotubes grow during
chemical vapor deposition - Laser reflectivity from vertically-aligned
arrays of multiwall nanotubes is providing some of the first direct measurements
of how fast nanotubes grow, and the dynamics of their growth.
Single-Wall
Carbon
Nanotubes - Exploring the Laser-Vaporization Synthesis Process
- The synthesis of single-walled carbon nanotubes (SWNTs) by laser
vaporization (LV) was pioneered by the group of Richard E. Smalley at Rice
University in 1995-1996. Here we review our work in unraveling the time
scales, rates, and mechanisms of SWNT growth by LV through our time-resolved
imaging and spectroscopy measurements.
.Comment
on "Single-Crystals of Single-Walled Carbon Nanotubes Formed by Self-Assembly"
- Schlittler et al. (1) reported the production of single crystals
of single-walled carbon nanotubes (SWCNTs) by the thermolysis of nanopatterned
structures of alternating layers of C60 and nickel. Electron diffraction,
high-resolution phase contrast imaging, and electron energy loss spectroscopy
(EELS) were used to characterize the resulting crystals. In this comment,
we report the reproduction of their experimental results; however, we disagree
with their interpretation of the data. We suggest that the crystals formed
in our experiments consist not of SWCNTs, but rather of calcium molybdenum
oxide.
Photoluminescent
Si Nanoparticles - Reveal how Nanoparticles form by Laser Ablation
- When a Si wafer is ablated into a background gas, ablated atoms
and molecules are confined as a hot plasma. After cooling by the gas, however,
they condense into clusters of atoms and nanoparticles (a 25-atom Si cluster
is 1-nm in size). Luminescent silicon has been the subject of much research.
Here, we create photoluminescent SiOx clusters in the gas phase by condensation,
and use this luminescence to track the nanoparticles as they form, and propagate.
The gas-phase photoluminescence spectrum (induced by a time-delayed second
laser) reveals interesting vibronic structure.
