nanofiber-base refrigeration · 2018. 8. 7. · pedot • the electrical conductivity does not...
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Nanofiber-base Refrigeration
Alexandria Trevino and Bret Flanders
Department of Physics
Kansas State University
TCTH
Seebeck Effect
∆V
Thermoelectric Refrigeration
Directional Growth of polypyrrole and polythiophene wires Prem S. Thapa, Deok Jin Yu, James P. Wicksted, Jeffrey A. Hadwiger, Joseph N. Barisci, Ray H. Baughman, and Bret N. Flanders
Directional electrochemical nanowire assembly
Thapa, P. S., Yu, D. J., Wicksted, J. P., Hadwiger, J. A., Barisci, J. N., Baughman, R. H., & Flanders, B.
N. (2009). Directional growth of polypyrrole and polythiophene wires. Applied Physics Letters,94(3),
033104. doi:10.1063/1.3072611
• Voltage-amplitude and frequency induces growth
• Knobby structure
• 𝐸𝑙𝑒𝑐𝑡𝑟𝑖𝑐𝑎𝑙 𝑐𝑜𝑛𝑑𝑢𝑐𝑡𝑖𝑣𝑖𝑡𝑦 =𝑙
𝑅𝐴
PEDOT:Heparin Growth
40 μm 20 μm
AU, WE AU, CE
Monomer Solution
AU, WE
AU, CEVoltage
Atomic Force Microscopy (AFM)
5 μm
1 µm
595 nm wire
963 nm wire
Diameter (nm)
400 600 800 1000 1200
Co
un
t
0
10
20
30
40
50
L=74.66 𝜇m
L=52.70 𝜇m
L=47.23 𝜇m
∆𝑉 − The voltage drop across R when I flows though it
100 𝜇M Heparin content
Length (𝛍m) Diameter (nm) Resistance (M𝞨) Conductivity (S cm^-1)
Wire 1 64.03 993 1.07 0.770
Wire 2 64.30 830 0.988 1.20
Wire 3 62.96 964 0.813 1.06
Wire 4 44.55 973 0.858 0.698
Wire 5 57.15 960 1.13 0.700
Wire 6 49.81 622 1.26 1.30
L=44.09 𝜇m
L=62.78 𝜇m
L=42.68 𝜇m
L=43.64 𝜇m
Length (𝛍m) Diameter (nm) Resistance (M𝞨) Conductivity (S cm^-1)
Wire 1 42.68 1362 0.322 0.910
10 𝜇m Heparin content
ConclusionHeparin
PEDOT
• The electrical conductivity does not depend on diameter, resistance,
and length.
• We should see a consistency with the electrical conductivity
of wires grown at the same conditions.
Future Work• Continue pursing decreasing the heparin content
• Test the electrical conductivity of PEDOT:
Heparin at different temperatures
• Test the thermal conductivity
• PEDOT: Tosylate
Acknowledgements
• Bret Flanders
• Krishna
• Gobind
• NSF
• K-State
• REU students
Questions?
5 μm
1 µm
Length
(𝛍m)
Diameter
(nm)
Resistance
(M𝞨)
Conductivity
(S cm^-1)
Wire 1 42.68 1362 0.322 0.910
L=74.66 𝜇m
L=52.70 𝜇m
L=47.23 𝜇m
L=44.09 𝜇m
L=62.78 𝜇m
L=42.68 𝜇m
L=43.64 𝜇m
Diameter (nm)
400 600 800 1000 1200
Co
un
t
0
10
20
30
40
50
20 μm
Length
(𝛍m)
Diameter
(nm)
Resistance
(M𝞨)
Conductivity
(S cm^-1)
Wire 1 64.03 993 1.07 0.770
Wire 2 64.30 830 0.988 1.20
Wire 3 62.96 964 0.813 1.06
Wire 4 44.55 973 0.858 0.698
Wire 5 57.15 960 1.13 0.700
Wire 6 49.81 622 1.26 1.30