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Effect of Film Morphology on Vapor Sensitivity of Monolayer-Capped Nanoparticles Sensors

Effect of Film Morphology on Vapor Sensitivity of Monolayer-Capped Nanoparticles Sensors. LNBD Meital Segev -Bar Gregory Shuster Prof. Hossam Haick. Sensors Based on Metal NPs - Theory. Tunneling Mechanism Based Sensors Response. Sensor response. S1. %RH.

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Effect of Film Morphology on Vapor Sensitivity of Monolayer-Capped Nanoparticles Sensors

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  1. Effect of Film Morphology on Vapor Sensitivity of Monolayer-Capped Nanoparticles Sensors LNBDMeitalSegev-BarGregory ShusterProf. HossamHaick

  2. Sensors Based on Metal NPs - Theory

  3. Tunneling Mechanism Based Sensors Response Sensor response S1 %RH

  4. Large Magnitude Negative Responses? S3 Sensor response %RH These sensors were fabricated from the same solution, the only difference: dry environment during drop casting

  5. Sensors Responses to Analytes 2-Ethylhexanol Decane All the sensors have a positive response of a few percent to polar and un-polar analytes High magnitude, negative responses occurs only in the present of water vapors

  6. Electrical Characteristics Sensor response Sensor response %RH %RH S3 S1 Sensor with negative responses have a I-V hysteresis in the present of water vapors

  7. HR-SEM Characterization of Sensors Morphology

  8. AFM Characterization of Sensors Morphology

  9. High magnitude, negative responses occurs only in the present of water vapors • Sensors with high magnitude, negative responses are perforated. • Tunneling is probably not the main mechanism for these responses Could water ionization on SiO surface control the responses?

  10. Water Ionization on SiO surface Bromothymol blue PH-Indicator

  11. Thanks

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