title: Sensing behaviors of polypyrrole nanotubes prepared in reverse microemulsions: effects of transducer size and transduction mechanism.
abstract: Polypyrrole (PPy) nanotubes with different diameters were readily fabricated using cylindrical micelle templates in sodium bis(2-ethylhexyl) sulfosuccinate (AOT) reverse microemulsions. Interestingly, Raman spectroscopy and ultraviolet (UV)-visible spectroscopy revealed that the PPy nanotubes with smaller diameters had a more extended conjugation length as well as a higher oxidation level. The PPy nanotubes were deposited onto a microelectrode array and were exposed to chemical vapor and electromagnetic radiation: typically, NH(3) vapor and UV light were chosen. The electrical response of PPy nanotubes to two different kinds of analytes was strongly dependent on their diameters. Moreover, since the small dimensions of PPy nanotubes facilitated the interaction between nanotubes and analytes, the PPy nanotube sensors showed conspicuously enhanced responses compared with conventional PPy.
authors.affiliation: Hyperstructured Organic Materials Research Center, School of Chemical Engineering, College of Engineering, Seoul National University, Shinlimdong 56-1, Seoul 151-742, Korea.
authors.forename: Hyeonseok
authors.initials: H
authors.lastname: Yoon
authors.forename: Mincheol
authors.initials: M
authors.lastname: Chang
authors.forename: Jyongsik
authors.initials: J
authors.lastname: Jang
mesh_terms: D004143:Dioctyl Sulfosuccinic Acid / Q000737:chemistry*; D004655:Emulsions; D008823:Micelles; D043942:Nanotubes / Q000737:chemistry*; D010316:Particle Size; D011108:Polymers / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013499:Surface Properties; D013997:Time Factors
chemical_list: D004655:Emulsions; D008823:Micelles; D011108:Polymers; D011758:Pyrroles; D004143:Dioctyl Sulfosuccinic Acid; C067635:polypyrrole