Conducting　poly(3-acetylpyrrole)　(PAPy)/multiwalled　carbon　nanotubes　(MWNTs)　composites　were　synthesized　by　the　in　situ　chemical　polymerization　of　3-acetylpyrrole　(APy)　onto　MWNTs.　The　structure　and　morphology　of　the　PAPy/MWNT　composites　were　characterized　by　Fourier　transform　infrared　(FTIR)　spectroscopy,　X-ray　diffraction,　field　emission　scanning　electron　microscopy　(FE-SEM),　transmission　electron　microscopy　(TEM),　and　thermogravimetric　analysis.　The　FTIR　results　indicated　that　no　chemical　reaction　occurred　between　the　PAPy　and　MWNTs,　and　only　the　MWNTs　served　as　a　template　for　APy　polymerization.　FE-SEM　and　TEM　suggested　that　PAPy　was　only　coated　on　the　surface　of　the　carbon　nanotubes,　and　the　thickness　of　the　PAPy　coating　on　each　nanotube　was　dependent　on　the　ratio　of　APy　to　MWNTs.　The　standard　four-probe　method　was　used　to　measure　the　electrical　conductivity　of　the　samples　at　room　temperature,　and　the　results　show　that　the　MWNTs　enhanced　the　electrical　conductivity　of　the　composites　compared　to　PAPy.　In　addition,　the　solution　stability　of　the　suspension　with　the　PAPy　[or　polypyrrole　(PPy)]/MWNT　composites　was　investigated;　this　showed　that　the　dispersion　of　the　PAPy/MWNT　composites　in　ethanol　solution　was　much　better　than　that　of　the　PPy/MWNT　composites.　(C)　2012　Wiley　Periodicals,　Inc.　J　Appl　Polym　Sci,　2012