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. Author manuscript; available in PMC: 2013 Mar 2.
Published in final edited form as: Nanotechnology. 2012 Feb 1;23(8):085203. doi: 10.1088/0957-4484/23/8/085203

Figure 3.

Figure 3

pH dependence of 3 working device containing open ends (semiconducting SWCNTs). (a)-(c) Ids-Vg semilog curves for three devices filled sequentially with pH=3 (red), pH=5 (green), pH=7 (blue) and pH=9 (magenta) 1mM KCl solutions at Vds=0.5V. The inset in (a) shows an optical image of a device sealed with a PDMS cover with microfluidc channels (green). The two blue squares (i.e., 60 μm × 60 μm) are the fluid reservoirs cut into the PMMA (yellow). (d) Gating efficiency ΔI/I- for different pH (black solid squares) for 3 devices. The measured ionic current at different pH was shown (gray open circles). The concentration of the KCl solution is 1mM and Vionic= 0.5V.