A monolayer of vertically aligned Au nanoparticles embedded in a dielectric film was fabricated by sandwiching a 3.4-nm-thick Au film between two polyimide (PI) precursor layers. Au formed uniform-sized nanoparticles on the PI precursor and coalesced into 10 nm sized nanoparticles during imidization, forming a well-dispersed monolayer of Au nanoparticles embedded in PI. Capacitance-voltage measurement at 300 K showed that the monolayer of Au nanoparticles functioning as a floating gate in Al/PI/Au nanoparticles/PI/Si metal-insulator-semiconductor-type capacitor exhibited a capacitance hysteresis of 3.4 V at an applied voltage of 6 V. The memory effect can be potentially utilized in next generation flash memories. (c) 2007 American Institute of Physics.
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