Patterning of polyaniline (PAni) films by lithographic process

Date

11-2006

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Marvin U. Herrera

Abstract

Conducting tracks of polyaniline (PAni) were made by utilizing a standard t1V lithographic procedure. PAni emcraldinc base was prepared and cast into films by dispersion in N - methyl - 2 pyrrolidinone (NMP) on glass substrates. A wax was spread on top of the PAni film, placed the printed tracks, exposed by UV light, developed and removed the resist. The patterned tracks on the film were doped by immersion of the cotton buds in 1 M aqueous solution for sulfuric acid (H2SO4) and perchloric acid (HCIO4) and by cotton swabbing on the film's surface. The identities of the doped films were confirmed by structural characterization using Fourier Transform Infrared (FT1R) Spectroscopy. The morphological properties of the films were studied using the obtained images from optical microscope and scanning electron microscope and attested to exhibit a smoother surface in the PAni HCIO4 doped film than the PAni H2SO4 doped film. Thermal properties show an endothermic peak at around 100°C determining the moisture and water loss of the sample. Electrical testing of the doped and adjacent tracks and the conductivity measurements verified the existence of current using the Linear Four Point Probe method. Reflectance spectroscopy established the color transition occurred in the film once doped. The presence of current reading was observable in the doped patterned tracks, which was assumed to have current flow in the doped film. The low conductivity value of the doped tracks may be associated to the doping mechanism made on the study. Hence, the obtained conductivity value suggests having enough penetration of the dopant acid on the film to have better conductivity measurements.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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