Electronic noise in nanostructures: limitations and sensing applications

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Title: Electronic noise in nanostructures: limitations and sensing applications
Author: Kim, Jong Un
Abstract: Nanostructures are nanometer scale structures (characteristic length less than 100 nm ) such as nanowires , ultra -small junctions , etc . Since nanostructures are less stable , their characteristic volume is much smaller compared to defect sizes and their characteristic length is close to acoustical phonon wavelength . Moreover , because nanostructures include significantly fewer charge carriers than microscale structures , electronic noise in nanostructures is enhanced compared to microscale structures . Additionally , in microprocessors , due to the small gate capacitance and reduced noise margin (due to reduced supply voltage to keep the electrical field at a reasonable level ) , the electronic noise results in bit errors . On the other hand , the enhanced noise is useful for advanced sensing applications which are called fluctuation -enhanced sensing . In this dissertation , we first survey our earlier results about the limitation of noise posed on specific nano processors . Here , single electron logic is considered for voltage controlled logic with thermal excitations and generic shot noise is considered for current -controlled logic . Secondly , we discuss our recent results on the electronic noise in nanoscale sensors for SEnsing of Phage -Triggered Ion Cascade (SEPTIC , for instant bacterial detection ) and for silicon nanowires for viral sensing . In the sensing of the phage -triggered ion cascade sensor , bacteriophage -infected bacteria release potassium ions and move randomly at the same time ; therefore , electronic noise (i .e . , stochastic signals ) are generated . As an advanced model , the electrophoretic effect in the SEPTIC sensor is discussed . In the viral sensor , since the combination of the analyte and a specific receptor located at the surface of the silicon nanowire occurs randomly in space and time , a stochastic signal is obtained . A mathematical model for a pH silicon nanowire nanosensor is developed and the size quantization effect in the nanosensor is also discussed . The calculation results are in excellent agreement with the experimental results in the literature .
URI: http : / /hdl .handle .net /1969 .1 /4942
Date: 2007-04-25

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Electronic noise in nanostructures: limitations and sensing applications. Available electronically from http : / /hdl .handle .net /1969 .1 /4942 .

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