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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

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

LNBDMeitalSegev-BarGregory ShusterProf. HossamHaick

large magnitude negative responses
Large Magnitude Negative Responses?

S3

Sensor response

%RH

These sensors were fabricated from the same solution, the only difference: dry environment during drop casting

sensors responses to analytes
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

electrical characteristics
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

slide9

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?

water ionization on sio surface
Water Ionization on SiO surface

Bromothymol blue PH-Indicator