DrexelPenn Research Experience for Teachers in Nanotechnology 2006 Synthesis and Characterization of

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Drexel/Penn Research Experience for Teachers in
Nanotechnology -2006Synthesis and
Characterization of NanowiresPenn MentorDr.
Ritesh AgarwallDr. Murrell Dobbins
Characterization
Sample Preparation
Synthesis
Background

• Nanowires(NWs) have novel electrical,optical,biolo
  gical, and chemical aspects.
• Used in memory and optical storage devices such
  as Cds DVDs.
• Common substancesCadmium Sulfide
  germanium-tellurium, antimony-tellurium,
  germanium-antimony-tellurium.

Chemical vapor deposition apparatus
Initial examination of wires by optical
microscopy.
Nanowire on TEM computer screen.
Cut silicon wafer for substrate
Clean wafer with ethanol.
Argon carrier and vacuum pump.
TEM Pictures
Reaction furnace
Wire samples on TEM grids.
Air dry.
Applying gold.
Gold catalyst sphere on tip of wire.
Parameters
LeftTEM image of CdS nanowires  middle TEM
image  rightFourier Transform of TEM image.
Furnace 730 degrees Celsius Argon carrier 200
SCCM Reaction time 30-45 minutes Pressure 100
Torr
Placing substrate in reaction tube.
Surface of wire(left). Fourier
Transform(right) Note hexagonal shape-connect
outer points.
Metal precursor in combustion boat.
Sample holder for TEM.
Energy Dispersive X-Ray Spectroscopy( EDX or EDS)
of a CdS nanowire
Reaction tube in furnace
Combustion boat in reaction tube.