Hi Ho yin,
What kind of electrodes do you use for your CNTFET
contact? also, CNT should not burn under room
temperature. and your I-V measurement is normal.
Actually a lot of parameters that are involve in your
measurement itself. For examples, how do you growth
your CNT, your choice of electrode contact, how do you
apply the gate and many more that I just cannot
mention in here. I would suggest you to do more
research on it.
Best,
Haroon

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 I would like to see if you can have experience in making measurement
of a CNT bridged electrode. Basically, I am trying to make a CNTFET. I found
that when I got a CNT bridged electrodes, it is extremely easy to be burnt.
It happens in CNT itself and the electrodes. I am guessing it is caused by
static charge in human body. I have already grounded myself while handling
the CNT bridged electrodes and taking IV measurement. The condition for the
IV measurement is in air and room temperature. Also, I found that the
current is extremely small which is ~1E-12 A. People always have current up
to couple nanoamps or more. I know that they may take the measurment under
vaccum. So, I would like to see whether you can share your experience with me.