Enhanced Electrical Conductivity Of Ag-mercaptosuccinic Acid-redoped Polyaniline Nanoparticles During Thermal Cycling Above 200℃

摘要

Ag-doped polyaniline (PANI) nanoparticles are prepared via doping-dedoping-redoping with the thiol group in mercaptosuccinic acid (MSA) providing the linkage between PAN1 molecules and Ag atoms. Ag-MSA-doped PANI maintains the electrical conductivity well above the room-temperature value of 3.0 S/cm up to 220℃, reaching its maximum (9.0 S/cm) at 180℃. In addition, Ag-MSA-doped PANI nanoparticles show remarkable stability against repeated thermal aging at 120 ℃. The room-temperature conductivity, in fact, increases by a factor of ~ 3 after 3 cycles of thermal aging. The enhanced stability against repeated thermal aging is attributed to the formation of uniformly distributed Ag nanoparticles within the PANI particles upon heating.