Tseng Ricky J, Huang Jiaxing, Ouyang Jianyong, Kaner Richard B, Yang Yang
Department of Materials Science and Engineering, University of California, Los Angeles, California 90095, USA.
Nano Lett. 2005 Jun;5(6):1077-80. doi: 10.1021/nl050587l.
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.
报道了一种基于用金纳米粒子修饰的共轭聚合物聚苯胺纳米纤维的非易失性塑料数字存储器件。该器件结构简单，由夹在两个电极之间的塑料复合膜组成。使用外部偏压对器件的导通和关断状态进行编程，这两种状态的电导率相差3个数量级。通过电脉冲测量观察到导通-关断切换时间小于25纳秒。器件在编程后具有长达数天的保留时间。还展示了写-读-擦除循环。开关机制归因于电场诱导的电荷从聚苯胺纳米纤维转移到金纳米粒子。通过与氯金酸的氧化还原反应，在直径30纳米的聚苯胺纳米纤维内生长纳米尺寸的金颗粒，从而形成活性聚合物层。该器件将纳米粒子和导电聚合物这两个令人兴奋的研究领域结合在一起，形成了一个具有独特功能的新型材料系统。
