Spatially Resolved Transport Properties of Pristine and Doped Single-Walled Carbon Nanotube Networks

详细信息    查看全文

• 作者：Andrej Znidarsic ; Antti Kaskela ; Patrik Laiho ; Miran Gaberscek ; Yutaka Ohno ; Albert G. Nasibulin ; Esko I. Kauppinen ; Abdou Hassanien
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：June 27, 2013
• 年：2013
• 卷：117
• 期：25
• 页码：13324-13330
• 全文大小：456K
• 年卷期：v.117,no.25(June 27, 2013)
• ISSN：1932-7455

文摘

We use noninvasive atomic force microscopy to probe the spatial electrical conductivity of isolated junctions of pristine and nitric acid treated single-walled carbon nanotube networks (SWCNT-N). By analyzing the local IV curves of SWCNTs and bundles with various diameters, the resistance per unit length and the contact resistance of their junctions are estimated to be 3鈥?6 k惟/渭m and 29鈥?32 k惟, respectively. We find that the contact resistance decreases with increasing SWCNT or bundle diameter and depends on the contact morphology, reaching a value of 29 k惟 at a diameter of 10 nm. A nitric acid treatment moderately dopes SWCNTs and reduces their average contact resistance by a factor of 3 while the resistance of the nanotubes remains largely unaltered. Remarkably, the same treatment on an SWCNT-N shows similar reduction in the sheet resistance by a factor of 4. These results suggest that the resistance reduction mechanism is related to the contact modulation with no major impact on conductance of SWCNTs.