Preparation and characterization of electroconductive polypyrrole copolymer Langmuir–Blodgett films

Abstract We successfully synthesized an amphiphilic pyrrole derivative, 12-pyrrolyl dodecanoic acid (PDA) and fabricated the Y-type multilayer PDA Langmuir–Blodgett (LB) films by the conventional vertical dipping method. We, however, could not obtain an electroconductive polymer LB film from PDA alone. We, therefore, carried out in situ copolymerization of pyrrole and PDA at the air–water interface by spreading the mixture solution of pyrrole and PDA with various feed ratio in chloroform onto a subphase containing 1 wt.% FeCl3. We confirmed that the well ordered electroconductive Y-type poly(PPy-co-PDA) LB film was successfully prepared with the feed mole ratio of 300:1 (pyrrole:PDA) under the condition of surface pressure 33 mN/m, pH 5.3, and 17 °C. Poly(PPy-co-PDA) LB multiplayer film showed the fairly high electrical conductivity of 2.3×10−3 S/cm and extremely smooth surface. We expect the electrically conducting polymer film with good structural order can be applied to many potential application fields such as volatile organic sensor, biosensor, or surface acoustic wave devices.

[1]  S. V. Mello,et al.  LB films of parent polypyrrole , 1999 .

[2]  K. Kanazawa,et al.  Electrochemical polymerization of pyrrole , 1979 .

[3]  S. V. Mello,et al.  Preparation of Langmuir−Blodgett Films of Soluble Polypyrrole , 1998 .

[4]  L. Huo,et al.  Preparation and characterization of doped polyaniline films , 1999 .

[5]  W. Sigmund,et al.  Thin films of a new polar substituted polypyrrole , 1999 .

[6]  M. Srinivasan,et al.  Composite Langmuir–Blodgett films containing polypyrrole and polyimide , 1998 .

[7]  Fernando J. Fonseca,et al.  Artificial Taste Sensor: Efficient Combination of Sensors Made from Langmuir−Blodgett Films of Conducting Polymers and a Ruthenium Complex and Self-Assembled Films of an Azobenzene-Containing Polymer , 2002 .

[8]  Nickolay V. Lavrik,et al.  Composite polyaniline/calixarene Langmuir - Blodgett films for gas sensing , 1996 .

[9]  N. Ogata,et al.  Fabrication of chiral poly(thiophene) Langmuir–Blodgett films , 1998 .

[10]  Yadong Jiang,et al.  Fabrication and characterization of polyaniline-based gas sensor by ultra-thin film technology , 2002 .

[11]  S. Major,et al.  Preparation and characterization of mixed LB films of polyaniline and cadmium arachidate , 1997 .

[12]  H. C. Montgomery.  Method for Measuring Electrical Resistivity of Anisotropic Materials , 1971 .

[13]  T. Bjørnholm,et al.  Supramolecular organization of highly conducting organic thin films by the Langmuir-Blodgett technique , 1999 .

[14]  M. Penza,et al.  Monitoring of NH3 gas by LB polypyrrole-based SAW sensor , 1998 .

[15]  M. Penza,et al.  SAW gas detection using Langmuir–Blodgett polypyrrole films , 1998 .

[16]  S. V. Mello,et al.  UV/Vis and SFM studies on Langmuir monolayers and Langmuir–Blodgett films of 16-mer aniline and o-pentadecylaniline blends , 1999 .

[17]  J. P. Cresswell,et al.  An optical gas sensor based on polyaniline Langmuir-Blodgett films , 1997 .

[18]  R. Lal,et al.  A Study of Langmuir and Langmuir−Blodgett Films of Polyaniline , 1997 .

[19]  C. Park,et al.  Preparation and properties of conducting arachidic acid/polypyrrole composite langmuir–blodgett films , 1996 .