title: Polyaniline nanofiber/gold nanoparticle nonvolatile memory.
abstract: A nonvolatile plastic digital memory device based on nanofibers of the conjugated polymer polyaniline decorated with gold nanoparticles is reported. The device has a simple structure consisting of the plastic composite film sandwiched between two electrodes. An external bias is used to program the ON and OFF states of the device that are separated by a 3-orders-of-magnitude difference in conductivity. ON-OFF switching times of less than 25 ns are observed by electrical pulse measurements. The devices possess prolonged retention times of several days after they have been programmed. Write-read-erase cycles are also demonstrated. The switching mechanism is attributed to an electric-field-induced charge transfer from the polyaniline nanofibers to the gold nanoparticles. The active polymer layer is created by growing nanometer size gold particles within 30-nm-diameter polyaniline nanofibers using a redox reaction with chloroauric acid. This device combines two exciting research areas--nanoparticles and conducting polymers--to form a novel materials system with unique functionality.
authors.affiliation: Department of Materials Science and Engineering, University of California, Los Angeles, California 90095, USA.
authors.forename: Ricky J
authors.initials: RJ
authors.lastname: Tseng
authors.forename: Jiaxing
authors.initials: J
authors.lastname: Huang
authors.forename: Jianyong
authors.initials: J
authors.lastname: Ouyang
authors.forename: Richard B
authors.initials: RB
authors.lastname: Kaner
authors.forename: Yang
authors.initials: Y
authors.lastname: Yang
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D004553:Electric Conductivity; D005898:Glass; D006046:Gold / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D046529:Microscopy, Electron, Transmission; D008956:Models, Chemical; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D011108:Polymers / Q000737:chemistry; D013997:Time Factors
chemical_list: D000814:Aniline Compounds; D011108:Polymers; C416807:polyaniline; D006046:Gold