Characterization of the Ion Conductivity for Surface Modified Polymer Electrolyte Thin Films! Anthony R. Layson, Department of Chemistry and Biochemistry, Denison University!
A polyethylene oxide (PEO) polymer electrolyte is drop cast onto the sensor portion of an!
To Impedance Spectrometer
Clean IME!
The IME is placed in hexane saturated with a molecule which then self assembles on the PEO surface. !
Interdigitated Micro Electrode (IME)! resulting in a thin layer covering the electrode surface !
Partially coated IME!
Growth was also monitored with Infrared Absorption Spectroscopy!
Growth of the self assembled molecule (SAM) is monitored by impedance spectroscopy.!
13 h
8h 4h 1h 0h Frequency (cm-1)
The increase in peak absorbance values closely mirrors the growth observed with impedance!
SAM: H(CH2)32(CH2CH2O)40H!
Impedance (Ω)
10 h
12000 10000 8000 6000 4000 2000 0
SAM Immersion! Monolayer growth ! Slows/stops!
0
5
10
15
Time (hrs)
Changes in the impedance of the PEO film provides a means to track SAM growth !
20
