Influence of carbon nanotube probe tilt angle on the effective probe stiffness and image quality in tapping-mode atomic force microscopy

Article Abstract:

The effect of tilt angle with respect to vertical, when using carbon nanotubes (CNTs) as tapping-mode AFM probes, for single-wall and multi-wall nanotube probes of diameters 3.4-5.5 nm and aspect ratio 7.5 is investigated. It is proposed that free-standing kinked probes be designed for the characterization of sensitive samples, whereby the probe approaches the sample at a vertical orientation and possesses a tilted section that regulates the tip-sample interaction forces.

Usage, High resolution spectroscopy, Nanotubes

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Theoretical investigation of the structure and coverage of the Si(111)-OCH(sub 3) surface

Article Abstract:

The surface structure, strain energy, and charge profile of the methoxylated Si(111) surface, Si(111)-OCH(sub 3), was studied using quantum mechanics, and the results are compared to those obtained for Si(111)-CH(sub 3) and Si(111)-C(sub 2)H(sub 2). The calculation indicate that 100 percent coverage is feasible for Si(111)-OCH(sub 3) (similar to the methylated surface), as compared to only ~80 percent coverage for ethylated surface.

All Other Basic Organic Chemical Manufacturing, All Other Basic Inorganic Chemical Manufacturing, Silicon & Inorganic Compounds, Methanol, Quantum theory, Quantum mechanics, Silicon compounds, Chemical properties

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Mechanisms of single-walled carbon nanotube probe-sample multistability in tapping mode AFM imaging

Article Abstract:

The use of single-walled carbon nanotube (SWNT) probes to create AFM images of SWNT samples in tapping mode which result in a decrease in the apparent width of the sample is presented. The two major mechanisms, which are smooth gliding and snapping that produce an effect, are discussed.

Science & research, Research, Carbon, Nanotechnology

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