Carbon Nanotube-Based Electrochemical Sensors: Principles and Applications in Biomedical Systems
Figure 15
SEM images of (a) an as-grown MWCNT array, (b) the surface of a polished MWCNT array embedded in an SiO2 matrix, (c) a high-density MWCNT nanoelectrode array (hd, 2 109 electrodes cm-2), (d) a low-density one (ld-1, 7 107 electrodes cm-2), (f) an as-grown MWCNT array on 2 mm Ni spots patterned with UV lithography, (g) an as-grown MWCNT array on 100 nm diameter Ni spots patterned with e-beam lithography, and (h) a schematic of the defective bamboo-like structure. (a), (b), (f), and (g) are uperspective views while (c) and (d) are top views. (e) is the TEM view of a single MWCNT. The scale bars in (a)–(g) are 500 nm, 200 nm, 500 nm, 500 nm, 50 nm, 2 m, and 5 m, respectively. [Reprinted with permission from Koehne et al. [206], J. Mater. Chem. , 14, 676 (2004). Copyright 2003, Royal Society of Chemistry.]
