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Polymer Conductivity Lab Lecture
Transcript of Polymer Conductivity Lab Lecture
b. Layer by layer assembly
i. Dip coating
1. A charged substrate, typically a glass slide, is immersed in a solution of oppositely charged polymer.
ii. Spin coating
iii. Spray coating
c. Absorbance/UV Spectroscopy
e. Acid-Base Doping Safety Precautions The PANi solution contains 10% N,N-dimethylacetamide, which is flammable and toxic.
The acidic polymer solutions, rinse baths, and electrolyte solution are mildly corrosive. Will a film with 8 bilayers
be more or less conductive
than a film with 2 bilayers? Layer By Layer
Assembly Introduction Overview Concepts Generally, metals and aqueous solutions are considered to have conductive capabilities.
However, what if we said that there is now such a thing as conductive polymers? Polymers Anti-reflective coatings on eyeglass lens
Non-stick, Teflon coatings on pots and pans
Anti-corrosive coatings on razors
Stain-repellant coatings on fabrics Polymers are long-chain molecules that are seen in plastics, proteins, and other products. Conductive polymers have a diverse range of applications. Applications to Real Life Goals of the Experiment 1. Students will investigate the process for fabricating thin films using LbL assembly and examine the various properties of the constructed films.
2. Conductive polymers (PANi)
3. Relationship between the number of bilayers on a PANi/SPS)n film and conductivity.
4. Arrow-pushing of the acid-doping mechanism to yield different oxidation states of polyaniline. Electrical Conductivity
Ohm’s Law: V=IR V= voltage
I = current Molecular Orbital
Theory i. Metals- no band gaps
ii. Semi-conductors- small band gaps
iii. Insulators- large band gaps Band Gap Energies Doping alters the electrical properties by allowing semi-conductors to reduce their band gaps.
Metals’ band gaps overlap, while insulators have such large band gaps that they aren’t affected. Doped and Un-doped
Effects Measures resistivity and conductivity Voltmeter *Resistivity and conductivity
are inverses of
each other Good Luck! Apoorva Dharmadhikari
Raymond Yeung Food for Thought