The resistance value is variable by changing the current value of the same measured point.
Check the contact first. Is it showing linear I-V? some fluctuation will be always, but that is ignorable.
The device in our lab is Lucas pro4 with keithley 2400
How can I check the contact?
OK, I now understand that you do have a non-linear behavior (resistance is "current dependent").
What current levels are you working at? What voltages result? Maybe, you'd want to share a "typical" curve or series of measurements. Is the nonlinear behavior reproducible or arbitrary?
The attached files is some readings I got for the same sample but with different current values
Unfortunately, I haven't succeeded unpacking the files with the program I normally use for this purpose. Can you zip?
I am a little surprised about the high levels of current you apparently apply (reading the file names). What is the size of the graphene flakes? Are they supposed to survive a milliamp?
(I guess I would rather have opted for pico- or nanoamps to start with...)
Dodji Amouzou,
THE PROBLEM WAS THAT, THE RESISTANCE OF GRAPHENE FILMS WERE SO HIGH AND THE FOUR PROBE DEVICE WAS NOT ABLE TO MEASURE IT
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