Professor: Cheng-Ho Chen

Student: Ying-Chen Lin

Date: 2015/01/21

Introduction

٥ Doping of metal oxides into PANI is possible by electrochemical deposition, electroless precipitation, solution casting, and vacuum deposition techniques.

٥ A colloidal particle of dodecylbenzene sulfonic acid is known as a steric stabilizer and has the potential to be dispersed finely in an aqueous medium due to their small size.

٥ Al2O3 is the most widely used metal oxide since it has high compression strength, hardness, resistance to abrasion, resistance to chemical attack by a wide range of chemicals even at elevated temperatures.

Materials

٥ Poly-N-isopropylacrylamide (NIPAAm)٥ Acrylic acid (AA)٥ Potassium persulfate (KPS)٥ aniline ٥ APS ٥ N,N’-methylenebisacrylamide (MBA) ٥ Alumina٥ DBSA٥ N-methyl-2-pyrrolidinone (NMP)

٥ CH3ONa

Fig. 1. Polymerization of PANI in the presence of PNA/Al2O3 microgels. (a) Incorporation of Al2O3 into the PNA matrix. (b) Polymerization of aniline in the presence of DBSA and PNA/Al2O3. (c) Formation of PANI–PNA/Al2O3 thin films.

Experimental

Results and discussion

Fig. 2. Scanning electron micrographs for (a) PANI–PNA, (b) PANI–PNA/Al2O3 (10%), and (c) PANI–PNA/Al2O3 (30%) films.

Results and discussion

Fig. 3. X-ray diffraction patterns for PANI–PNA, PANI–PNA/Al2O3 (10%), and PANI–PNA/Al2O3 (30%) films.

19 ： residual-ordered DBSA or PNA

25 ： crystalline PANDB

Fig. 4. X-ray photoelectron spectra for PANI–PNA, PANI–PNA/Al2O3 (10%), and PANI–PNA/Al2O3 (30%) powders.

285 and 399.5 eV ： polyaniline

167.95 eV ： R–SO3- in DBSA

531 and 74.4 eV ： Al–O–C complex.

Results and discussion

Fig. 5. TGA curve of PANI–PNA, PANI–PNA/Al2O3 (10%), and PANI–PNA/Al2O3 (30%) films recorded under N2 atmosphere at a heating rate of 10 C/min.

100°C：gradual evaporation of moisture/PNA.

250–500°C ： thermo-chemical decomposition of the chemically active organic materials

Fig. 6. Temperature dependence of electrical resistance for the composites of PANI–PNA, PANI–PNA/Al2O3 (5%), PANI–PNA/Al2O3 (10%), PANI–PNA/Al2O3 (20%), and PANI–PNA/Al2O3 (30%).

Fig. 7. Temperature dependence of DC conductivity for PANI–PNA, PANI–PNA/Al2O3 (5%), PANI–PNA/Al2O3 (10%),PANI–PNA/Al2O3 (20%), and PANI–PNA/Al2O3 (30%).

Results and discussion

Conclusions

٥ New types of ternary PANI–PNA/Al2O3 composites were synthesized in the presence of DBSA by means of the oxidative polymerization of aniline with different wt% of Al2O3.

٥ The decrease in conductivity as the concentration of Al2O3 increased.