Transcript Complex Engineered Chemical/Biological Sensing System based on

Complex Engineered Chemical/Biological Sensing System based on
Precisely Defined Conducting Polymer Nanowire Arrays
Yixuan Chen
Department of Electrical & Computer Engineering
Advisor: Yi Luo
Methodology: Unique
approach to fabricate
deterministic heterogeneous
conducting polymer (CP)
nanowire arrays as sensor
arrays for sensitive, robust,
multi-dimensional sensing
Pt
(a)
SiO2
(b)
(c)
precursor mixture1
Prototype multiple conducting
polymer sensing structure
20.0
200 nm
(d)
+V
+V
(f)
(e)
+V
+V
precursor mixture2
100 nm
+V
+V
(g)
0 nm
(h)
10.0
(i)
+V
+V
+V
+V
PEDOT
PT
(j)
50µm
0
20.0
µm
10.0
0
NW sensors
5µm
PPY
(l)
(k)
Adhesion layer
CP nano-structure
N2 carrier gas
biological sensing
Extend to multiple (e.g. ~100)
heterogeneous CP nanowires
for multi-dimensional sensing,
identification & quantification
Integration of peripheral
electronics on a single chip
Ultimate goal: Robust multi-modality
sensing system-on-a-chip
Precision pump
Electrical signal
8
Acetone
Chloroform
Ethanol
Hexane
Moisture*
IPA
Methanol
Toluene
Analyte
ΔR/R of PPY (%)
Setup for chemical /
6
4
2
0
-2
-1
0
1
2
3
ΔR/R of PEDOT (%)
An example of 2-D sensing based on 2 heterogeneous CP nanowires