Polyaniline nanofiber/gold nanoparticle nonvolatile memory

Ricky J. Tseng, Jiaxing Huang, Jianyong Ouyang, Richard B. Kaner, Yang Yang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

854 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)1077-1080
Number of pages4
JournalNano letters
Issue number6
StatePublished - Jun 2005

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • Mechanical Engineering
  • Bioengineering
  • General Materials Science


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