A typical in situ variation of four-probe dc resistance of K-doped SWNT mats normalized to the resistance of the pristine SWNT mat as a function of exposure time to K vapor. The arrows indicate the time at which the temperature was increased to 410 and .
In situ variation of four-probe resistance of K-doped SWNT, peapods, and DWNT mats normalized to the resistance (before the doping started) as a function of exposure time to K vapor.
In situ variation of TEP of SWNT, peapods, and DWNT mats as a function of time to K-doping at .
Temperature dependence of (a) resistance and (b) TEP (S) before and after saturation doping with K for SWNTs, peapods, and DWNT mats. The solid symbols represent the sample prior to doping and the open symbols after saturation doping.
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