Conductive AFM-I-V curve

Nishith Parikh posted on Fri, Mar 30 2012 1:32 PM

rated by 0 users

Hello,

I have Dimension Icon AFM with extended TUNA module and have some issues regarding I-V measurement. I did current imaging on my sample using conductive AFm with bias voltage of 500 mV and current sensitivity of 100 nA/v. My sample is catalyst layer which is made of carbon black particles and nafion polymer. As expected, i see areas of high current (representing carbon particles) and low current (representing nafion) regions. The problems starts when i go to ramp mode and try to capture I-V curves. I am getting same I-V curves in both high and low current region. I looked into 20-25 other locations using ' point and shoot' mode, but i am getting same I-V curves. I don't understand why i don't see any variation in I-V curves.