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

This study explores the effect of film morphology on sensors based on metal NPs, focusing on the response to water vapor. The sensors exhibit unique responses to various analytes, with high magnitude negative responses only in the presence of water vapors. Electrical and morphological characteristics of the sensors are investigated, suggesting water ionization on SiO surface could influence the responses.

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Impact 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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