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Electrostatic Switching in Vertically Oriented Nanotubes for Nonvolatile Memory ApplicationsWe have demonstrated electrostatic switching in vertically oriented nanotubes or nanofibers, where a nanoprobe was used as the actuating electrode inside an SEM. When the nanoprobe was manipulated to be in close proximity to a single tube, switching voltages between 10 V - 40 V were observed, depending on the geometrical parameters. The turn-on transitions appeared to be much sharper than the turn-off transitions which were limited by the tube-to-probe contact resistances. In many cases, stiction forces at these dimensions were dominant, since the tube appeared stuck to the probe even after the voltage returned to 0 V, suggesting that such structures are promising for nonvolatile memory applications. The stiction effects, to some extent, can be adjusted by engineering the switch geometry appropriately. Nanoscale mechanical measurements were also conducted on the tubes using a custom-built anoindentor inside an SEM, from which preliminary material parameters, such as the elastic modulus, were extracted. The mechanical measurements also revealed that the tubes appear to be well adhered to the substrate. The material parameters gathered from the mechanical measurements were then used in developing an electrostatic model of the switch using a commercially available finite-element simulator. The calculated pull-in voltages appeared to be in agreement to the experimentally obtained switching voltages to first order.
Document ID
Document Type
Conference Paper
External Source(s)
Kaul, Anupama B. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Khan, Paul (University of Southern California Los Angeles, CA, United States)
Jennings, Andrew T. (California Inst. of Tech. Pasadena, CA, United States)
Greer, Julia R. (California Inst. of Tech. Pasadena, CA, United States)
Megerian, Krikor G. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Allmen, Paul von (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
April 22, 2015
Publication Date
April 13, 2009
Subject Category
Electronics and Electrical Engineering
Meeting Information
2009 MRS Spring Meeting & Exhibit(San Francisco, CA)
Distribution Limits
plasma-enhanced chemical vapor deposition (PECVD).
electrostatic switching
Nano-electro-mechanical (NEM)
3D electronics