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2 article(s) from Shaw, Gordon A.

A simple method for the determination of qPlus sensor spring constants

John Melcher,
Julian Stirling and
Gordon A. Shaw

Beilstein J. Nanotechnol. 2015, 6, 1733–1742, doi:10.3762/bjnano.6.177

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Figure 1: Optical images of a commercial qPlus sensor [8]. (a) Plane-view image consisting of an E158 quartz tun...

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Figure 2: Model schematic for the qPlus sensor. The tine is a uniform beam with linear mass density μ, flexur...

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Figure 3: Tip displacement angle ψ vs tip height H calculated for the tungsten wire tip described in Table 1 and a h...

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Figure 4: Theoretical prediction of the spring constant k_z. (a) k_z vs axial tip offset B. The spring constant...

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Figure 5: Reconstructed grid spectroscopy images for Si–Si Morse potential with varying tip heights. Red arro...

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Figure 6: Dependence of the spring constant k_z on the effective length of the cantilever L_eff. Two distinct v...

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Figure 7: Nanoindenter measurements from a tunning fork tine. [Graphic 9] vs b is plotted where k_I is the spring constan...

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Full Research Paper

Published 14 Aug 2015

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Calculation of the effect of tip geometry on noncontact atomic force microscopy using a qPlus sensor

Julian Stirling and
Gordon A. Shaw

Beilstein J. Nanotechnol. 2013, 4, 10–19, doi:10.3762/bjnano.4.2

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Figure 1: (a) Diagram of theoretical model. d_ax is the distance from the centre of mass of the tip to the axi...

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Figure 2: The ratio of dynamic spring constants k_n to the cantilever static spring constant k_stat for n = 1,2...

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Figure 3: Effect of tip geometry on tip movement for an arbitrary oscillation amplitude. (a) Angle of tip rot...

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Figure 4: Effect of tip motion on imaging for an oscillation amplitude of a_z = 5 Å. All image widths are 2 nm...

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Figure 5: Effect tip motion on spectroscopy for an oscillation amplitude of a_z = 5 Å. Simulated spectroscopy ...

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Full Research Paper

Published 08 Jan 2013

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