Johnson LabExpertise and Facilities
Brett Goldsmith
NBIC Meeting
9 March 2009
Lab Overview:Making Nanoscale Sensors
Growing Carbon Nanotubes
2 independent furnaces
with nanotube feedstock
gasses: Ar, H2, CH4
1 inch furnace temp
control to 1000 °C
2 inch furnace temp
control to 1200 °C
Available Materials
100 μm
Carbon nanotube networks
Nanotube growth in
controlled locations
Isolated carbon nanotubes
Available Materials
20 μm
1 μm
Mechanically exfoliated graphene
- isolated flakes down to atomic monolayers
Reduced graphene oxide
- isolated flakes and films
CVD-grown graphene
- continuous films of few
layer graphene
- can be transferred to
almost any substrate
Making Devices
e-Beam lithography with
25 nm resolution
Optical lithography on
flat surfaces with 1 μm
resolution
Bio-functionalization
process with ssDNA and
proteins.
10 μm
Measurement Tools
Mass Flow Controllers
Switching Valve
Sample Chamber
Analyte
Humidity Control
Environmental Control
Vapor sensing experiments
-Humidity control
-Temp control from
260 to 380 K
Liquid sensing
(in development)
Cryogenic (down to 4 K)
Measurement TechniqueOdor Bare
TubeSeq1 Seq
1Alpha
Seq1RNA
Seq2
Seq2Alpha
Seq2
Soup
Seq2RNA
GT12
A21 C21 G21 T21
PA 0±1 +17±2 0±1 +45±10 +8±1 +10±3 0±1 +40±5 0±1 0±1 0±1 0±1 0±1
TMA -9±2 -20±2 -20±3 -40±10 -30±2 +14±2 -25±5 -45±5 -50±5 -25±3 -16±5 -50±6 -10±6
Methanol 0±1 -12±2 -50±2 +32±5 -20±2 +8±1 -60±4 +20±5 -4±2 -15±2 0±1 -50±2 0±1
DMMP 0±1 -14±2 0±1 +30±5 -7±2 -15±2 0±1 -35±10 0±1 0±1 0±1 0±1 0±1
DNT 0±1 -14±4 0±1 -20±5 -4±2 0±4 0±1 -70±10 0±1 0±1 0±1 0±1 0±1
Other Expertise
Raman Spectroscopy
Noise Analysis
• Chemical and electrochemical nanotube modification
• Electrochemical growth of nanowires
• TEM and in-situ electronic measurements
• Nanogap fabrication
• Hybrid AFM measurements: SGM, EFM
Group MembersJohnson Group, Upenn Physics
Prof. A.T. Charlie Johnson
Ryan Jones
Matthew Berck
Dan Singer
Nicholas Kybert
Thomas Ly
Dr. Zhengtang Luo
Dr. Brett Goldsmith
Dr. Sasa Zaric
Sam Khamis
Bob Johnson
Luke Somers
Ye Lu
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