Figure 4: Optically imaging of on-surface and suspended carbon nanotube devices.
From: Automated circuit fabrication and direct characterization of carbon nanotube vibrations
(a) Dark-field optical microscopy image of marked carbon nanotube (CNT) with p-nitrobenzoic acid (pNBA) nanocrystals (NCs), and overlay of the lithography circuit design. Scale bar is 10 μm. (b) Optical image of the complete fabricated device. The two different colour electrodes are two different metallic contacts. Scale bar is 10 μm. (c) Transfer characteristic of the two CNTs devices 1 (blue), and 2 (red). Inset: SEM image of the completed circuit. Blue arrow points towards the CNT that was marked in (a). Scale bar, 10 μm. (d) Top: Dark field optical microscopy image of marked junction. Bottom: SEM image of the same junction. Scale bar in both images is 3 μm. (e) Main panel: Transfer characteristic of suspended CNT before pNBA deposition (blue), immediately after deposition (green), and after cleaning process (red). Inset: Dark field optical microscopy image of the measured junction marked with pNBA NCs. Scale bar, 3 μm (f,g) Dark field optical images of long suspended CNTs decorated with pNBA NCs. Scale bar, 50 μm.
