ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
Novel raspberrylike organic-inorganic hybrids consisting of spherical silicasupporting smaller conductive polypyrrole particles were prepared through aself-assembly polymerization process by choosing chitosan as a modifying agent ofsilica surface. TEM shows the raspberrylike morphology of resulted hybrids.Hydrogen-bonding interaction between the acetylamino of chitosan and hydrogen atom on nitrogen of polypyrrole is a determining parameter to get the raspberrylikemorphology. The raspberrylike silica-polypyrrole hybrids exhibited high conductivity of 8 s.cm-1 and its suspensions possessed good stability because of the special surface morphology. In the past few years, organic-inorganic nanocomposite particles have become the subject of rapidly growing interest for their superior properties (optical, mechanical, rheological, electrical, catalytic);1-2 In this field, silica is the most commonly used inorganic support. On the other hand, polypyrrrole(Ppy) is also commonly used organic shell.3 If Ppy nanocomposite systems can be prepared in stable colloidal form, the poor processibility of Ppy can be overcome, at lest partly, so that its applications can extended to wide areas.However, since silica is initially hydrophilic, hydrophobic Ppy shell is very difficultto get by direct surface polymerization. Only “raspberry” like composite was got. Ahigh-resolution TEM picture obtained by Gill et. al. was the first report to reveal thisunusual “raspberry” morphology where the composite particles were aggregates of the original small silica particles held together by the conducting polymer component which
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.111.83.pdf
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