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This is a room-temperature probe station I put together. Used with a typical Keithley electrometer,
it allows us to quickly and easily test high impedance samples in the fempto-amp current range.
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This is cryostat system I put together. It's based around a Janis liquid helium flow cryostat.
We use this for molecular measurements down to 2.5 K. Special modifications that I've made allow the atmosphere to
be controlled while the samples are modified with molecular solutions at room temperature.
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This is a pogo-pin array I designed and constructed. It allows for fast and easy connection
to samples without needing to wire-bond. It works great for cycling samples down to liquid helium temperatures
and with wet chemistry at room temperature.
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I have used these pogo-pin arrays in our dilution refrigerator (shown attached
to the mixing chamber), where they have
been successfully cycled numerous times down to ~50 mK.
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This is a transmission electron microscope (TEM) holder I have built
for doing insitu (real-time) electrical measurements of nanometer-scale devices
inside a TEM. The steel shaft was constructed by Tim at the U Penn Physics machine shop. With my help,
he constructed and reverse engineered it to fit inside our 2010f TEM. I designed and constructed the brass and copper fittings
at the end, and wired the connector, which allows for easy wire-bonding of samples
on nitride-membrane for TEM imaging.
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An electrochemistry set-up I built with a summer student, Journee Isip. The circuit and
electronics are on top, while the electrochemistry cell with argon feedthroughs is
lower-left. Some preliminary test measurements of ferrocene molecules are shown at lower-right.
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This is a low-noise buffering amplifier Dan Johnston and I have built to allow us to apply large currents to our
samples with roughly a MHz bandwidth. We use it with our probe stations and the cryostats.
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This is a low-noise buffered-multiplexer I have built to make simultaneous current-voltage-gate
measurements of 8 samples at one time, without destroying the samples. Sam Khamis and Yapping Dan both gave
me useful advice when putting it together.
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An angle evaporation stage (circled) I set up in our electron beam evaporator at Penn.
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A flow-control chemical vapor deposition system I set up with Dan Johnston and
Cristian Staii for growing nanotubes.
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