Structure Control and Applications of Conducting Polyaniline

Title
Structure Control and Applications of Conducting Polyaniline
Author
어경찬
Alternative Author(s)
Uh, Kyungchan
Advisor(s)
김종만
Issue Date
2017-02
Publisher
한양대학교
Degree
Doctor
Abstract
Polyaniline (PANI), a family of conducting polymers that conduct electricity by doping with specific impurities, has served as one of the most promising materials in a variety of fields including sensors, actuators, and electrodes. In this dissertation, three types of conducting polyanilines having fiber or patterned structure were developed for electroactive actuator, gas sensor, and metallic nanomaterials micro-pattern. Firstly, long, flexible, and conductive (∼270 S/cm) microfibers were generated by a process employing wet-spinning of a preorganized camphorsulfonic acid (CSA)-doped PANI gel. Using this microfiber, we developed electrolyte-free, single component, polymer electroactive actuator, which has a fast response time, high durability, and requires a low driving voltage (<5 V). Reversible bending motions take place upon application of an alternating current (AC) to the PANI polymer. This motion, promoted by a significantly low driving voltage (<0.5 V) in the presence of an external magnetic field, has a very rapid swinging speed (9000 swings/min) that lies in the range of those of flies and bees (1000∼15000 swings/min), and it is fatigue-resistant (>one million cycles). Secondly, fabrication of PANI fibers using an acid-labile tert-butoxycarbonyl (t-Boc)-protected PANI (t-Boc PANI) as the conducting polymer precursor was investigated. The t-Boc PANI is soluble in common organic solvents (e.g., chloroform and THF), and electrospinning of t-Boc PANI in those solvents afforded nano/micron-sized t-Boc PANI fibers. Treatment of the electrospun t-Boc PANI fibers with HCl resulted in the removal of the acid labile t-Boc group and the generation of conducting (∼20 S/cm) PANI fibers. The HCl doped PANI electrospun mat was successfully used in the detection of gaseous ammonia with a detection limit of 10 ppm. Interestingly, the PANI electrospun mat displayed a superior sensitivity and much faster response relative to the film-type sensor. Lastly, conducting polymer micro-pattern was designed using a t-Boc PANI as the PANI precursor. The conducting polymer pattern was obtained by employing a standard photolithographic technique with t-Boc PANI and a photoacid generator (PAG). Incubation of the patterned PANI film in the 0.05 M aqueous AgNO3 solution triggered generation of triangular silver metals (length of side: 50∼100 nm) along the patterned PANI film through the oxidation-reduction reaction without requiring any reducing agent. It is believed that these new and facile strategies described above could open new avenues for the manipulations and applications of PANI materials.
URI
https://repository.hanyang.ac.kr/handle/20.500.11754/124276http://hanyang.dcollection.net/common/orgView/200000429767
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > CHEMICAL ENGINEERING(화학공학과) > Theses (Ph.D.)
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