Nanowire_sensors

Nanowire_sensors - Nanowire Sensors Nanowire-Based Sensors...

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Nanowire Sensors
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A. K. Wanekaya et al., Electroanalysis 18, 2006, No. 6, 533 – 550 Nanowire-Based Sensors Nanowire-Based Sensors Nanowire sensors are ultimately scaled (1-D) ISFETS Binding to 1-D nanowire leads to depletion or accumulation in the “bulk” of the nanowire as opposed to only the surface in 2-D thin-film case. Nanowire materials Carbon Nanotubes (CNTs) Silicon Nanowires (SiNWs) Conducting Polymer Nanowires (CP NWs) Nanowire fabrication methods Bottom-up via spontaneous or catalyst-assisted crystal growth (vapor-liquid-solid) Top-down via photolithographic (or e-beam) patterning of bulk crystals Dip-pen lithography (CP NWs)
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Why Nanowires? Why Nanowires? P. Nair and M. A. Alam, IEEE TRANSACTIONS ON ELECTRON DEVICES, 54(12), 3400-3408 (2007). Drastically improved sensitivity over planar ISFETs: The sensitivity is defined as with the nanowire conductance being Molecule attachment changes the charge at the surface leading to a change in conductance 0 / G G S = ) 4 /( 2 0 NW D L d N q G π μ = d Q πσ = NW L d G / μσ = D qdN S σ 4 = Smaller nanowires provide higher sensitivity! … but we need to improve on this crude model.
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Nanowire Simulation Nanowire Simulation Silicon region The carrier transport through the NW is described by the drift-diffusion equation The potential and carrier concentrations are interdependent
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Nanowire_sensors - Nanowire Sensors Nanowire-Based Sensors...

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