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