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Nanowire NanoSensors for Highly Sensitive and Selective Detection of Biological and Chemical Species

Nanowire NanoSensors for Highly Sensitive and Selective Detection of Biological and Chemical Species. Yi Cui, Qingqiao Wei, Hongkun Park, Charles M. Lieber August 17, 2001. Outline. Planar Field effect Transitors Boron-doped Silicon Nanowires (SiNws). Planar FETs.

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Nanowire NanoSensors for Highly Sensitive and Selective Detection of Biological and Chemical Species

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  1. NanowireNanoSensors for Highly Sensitive and Selective Detection of Biological and Chemical Species Yi Cui, Qingqiao Wei, Hongkun Park, Charles M. Lieber August 17, 2001

  2. Outline • Planar Field effect Transitors • Boron-doped Silicon Nanowires (SiNws)

  3. Planar FETs • Easy to detect binding by change in conductance • Limited sensitivity and potential for integration

  4. Nanoscale FETs • Increased sensitivity- single molecule detection • Can create dense arrays • Nanotubes have limitations • Both metallic and semiconductor • Modifications of the NT surface are not develped

  5. Using Si Nanowires • Always semiconducting • Can control dopant type and concentration • Tune sensitivity • Massive knowledge of modification to the oxide surfaces

  6. Nano pH sensor

  7. What happened • At low pH –NH2 is protonated to –NH3+ • Acts like postitive gate • Depletes hole carriers • Decreases conductance • At High pH –SiOH is deprotonated to –SiO- • Increases conductance

  8. Conclusion • pH sensor is effective • Modifications of the oxide surface could be better • Can be used to detect many biological and chemical species

  9. Thank you

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