A complex study of the structure “carbon nanotubes - silicon substrate” photoconductivity mechanism

Tripathi, Nishant; Pavelyev, V. S.; Меженин, А. В.; Sovetkina, M. A.; Rymzhina, Anastasiia

doi:10.1088/1742-6596/1368/2/022051

Cited by 1 publication

(2 citation statements)

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“…The 2−10 nm CNT energy band gap can be around 0.2 to 0.8 eV. 32 We would like to clarify that the CNTs here are lying on the insulating surface of silicon oxide (i.e., SiO 2 ) and hence well separated from the substrate, and they are only connected from the end of the AFM metallic probe, which is in turn connected to the ground. Thus, the CNT-based rectennas provide similar configuration to that of micro-monopole antennas in microwave communication devices.…”

Section: ■ Experimental Proceduresmentioning

confidence: 94%

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Focused Ion Beam Engineering of Carbon Nanotubes for Optical Rectenna Applications

Abbas

Khan

Ravaux

et al. 2022

ACS Appl. Nano Mater.

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The optical rectenna is a device that converts the optical range of electromagnetic radiations to a direct current. Optical antennas, as for the radio frequency (RF) antennas, require an antenna's structure in the range of optical light EM wavelengths, i.e., a few hundred nanometers to a few micrometers. Herein, we demonstrate the optical rectenna effect of single-wall carbon nanotubes (SWCNTs) by cutting them in the resonance lengths of monopole nano-antennas (i.e., λ/4) of 100, 150, and 200 nm to convert incident red, green, and blue lights into a direct current. The physical engineering (cutting) of SWCNTs dispersed on SiO 2 /Si, comparable to one-quarter of the incident monochromatic light wavelength (i.e., red, green, and blue), is carried out with high-energy gallium (Ga) ion beams, with the help of a focused ion beam (FIB) system. The rectenna characteristics of these engineered SWCNTs are investigated using conductive mode atomic force microscopy (C-AFM). This unprecedented approach to investigating the optical rectennas will open more directions to study the rectenna effect at the nanometer scale.

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Section: ■ Experimental Proceduresmentioning

confidence: 94%

“…However, in our atomic force microscopy (AFM) study, we selected individual CNTs around 8–10 nm in average diameter to be characterized by placing the AFM nanoprobe directly on each CNT. The 2–10 nm CNT energy band gap can be around 0.2 to 0.8 eV …”

Section: Methodsmentioning

confidence: 99%