slide1 n.
Download
Skip this Video
Download Presentation
Nanowire NanoSensors for Highly Sensitive and Selective Detection of Biological and Chemical Species

Loading in 2 Seconds...

play fullscreen
1 / 9

Nanowire NanoSensors for Highly Sensitive and Selective Detection of Biological and Chemical Species - PowerPoint PPT Presentation


  • 208 Views
  • Uploaded on

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.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Nanowire NanoSensors for Highly Sensitive and Selective Detection of Biological and Chemical Species' - maine


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

NanowireNanoSensors for Highly Sensitive and Selective Detection of Biological and Chemical Species

Yi Cui, Qingqiao Wei, Hongkun Park, Charles M. Lieber

August 17, 2001

outline
Outline
  • Planar Field effect Transitors
  • Boron-doped Silicon Nanowires (SiNws)
planar fets
Planar FETs
  • Easy to detect binding by change in conductance
  • Limited sensitivity and potential for integration
nanoscale fets
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
using si nanowires
Using Si Nanowires
  • Always semiconducting
  • Can control dopant type and concentration
    • Tune sensitivity
  • Massive knowledge of modification to the oxide surfaces
what happened
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
conclusion
Conclusion
  • pH sensor is effective
  • Modifications of the oxide surface could be better
  • Can be used to detect many biological and chemical species