Improvement of a dynamic scanning force microscope for highest resolution imaging in ultrahigh vacuum

Torbrügge, Stefan; Lübbe, Jannis; Tröger, L.; Cranney, Marion; Eguchi, Toyoaki; Hasegawa, Yukio; Reichling, Michael

doi:10.1063/1.2964119

Cited by 24 publications

(17 citation statements)

References 26 publications

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“…The self-oscillating mode was replaced by a phase locked loop (PLL) setup from Nanosurf (easyscan2, Nanosurf, Woburn, MA, USA). The sensitivity and the signal-to-noise ratio were increased by replacing the internal laser diode by an external one combined with a replacement of the preamplifier of the position-sensitive diode signal, according to the concept of Torbrugge et al [24]. …”

Section: Methodsmentioning

confidence: 99%

Crystallographic order and decomposition of [MnIII6CrIII]3+ single-molecule magnets deposited in submonolayers and monolayers on HOPG studied by means of molecular resolved atomic force microscopy (AFM) and Kelvin probe force microscopy in UHV

et al. 2014

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Monolayers and submonolayers of [Mn III 6 Cr III ] 3+ single-molecule magnets (SMMs) adsorbed on highly oriented pyrolytic graphite (HOPG) using the droplet technique characterized by non-contact atomic force microscopy (nc-AFM) as well as by Kelvin probe force microscopy (KPFM) show island-like structures with heights resembling the height of the molecule. Furthermore, islands were found which revealed ordered 1D as well as 2D structures with periods close to the width of the SMMs. Along this, islands which show half the heights of intact SMMs were observed which are evidences for a decomposing process of the molecules during the preparation. Finally, models for the structure of the ordered SMM adsorbates are proposed to explain the observations.

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Section: Methodsmentioning

confidence: 99%

Crystallographic order and decomposition of [MnIII6CrIII]3+ single-molecule magnets deposited in submonolayers and monolayers on HOPG studied by means of molecular resolved atomic force microscopy (AFM) and Kelvin probe force microscopy in UHV

et al. 2014

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“…Experiments are carried out in an ultrahigh vacuum system at a base pressure of 1 × 10 -10 mbar with a modified commercial scanning force microscope 28 operated at room temperature in the noncontact mode of operation (NC-AFM), 29 keeping the cantilever oscillation amplitude constant at a level of 45 nm and the tip-surface electrostatic interaction minimized. 30 We use p-doped silicon cantilevers (PPP-QFMR, Nanosensors, Neuchatel, Switzerland) having a nominal spring constant of about 2.8 N/m, a resonance frequency of typically 70 kHz, and quality factors exceeding 30 000.…”

Section: Methodsmentioning

confidence: 99%

Stabilization of Zinc-Terminated ZnO(0001) by a Modified Surface Stoichiometry

2009

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The stabilization of polar oxide surfaces is of fundamental interest for understanding many processes in surface chemistry. We study the zinc-terminated Zn-ZnO(0001), a surface important in heterogeneous catalysis, by highest resolution scanning force microscopy (SFM) operated in the noncontact mode (NC-AFM). While most of the surface morphology is dominated by a phase consisting of triangular shaped nanostructures, we observe a coexisting (1 × 3) reconstructed phase where the reconstruction is ascribed to the formation of missing Zn-rows. Our findings provide evidence that the electrostatic instability of the polar Zn-ZnO(0001) surface can be canceled by a reduction of the surface charge by 1/3 which is considerably larger than the value of 1/4 derived from a simple ionic model for polar stabilization. Within the presented model for the (1 × 3) reconstruction, the role of point defects tentatively ascribed to hydrogen adsorbed on top of double Zn-rows forming zinc-hydride is discussed.

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“…The detection-system noise represented by is governed by the quality of the optical and electronic components used in the detection system. In contrast to thermal noise, which is a fixed quantity for a given cantilever and temperature, the detection-system noise floor can be reduced by technical improvements of the detection system [3,7–8]. …”

Section: Introductionmentioning

confidence: 99%

Thermal noise limit for ultra-high vacuum noncontact atomic force microscopy

Lübbe¹,

Temmen²,

Rode³

et al. 2013

Beilstein J. Nanotechnol.

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SummaryThe noise of the frequency-shift signal Δf in noncontact atomic force microscopy (NC-AFM) consists of cantilever thermal noise, tip–surface-interaction noise and instrumental noise from the detection and signal processing systems. We investigate how the displacement-noise spectral density d z at the input of the frequency demodulator propagates to the frequency-shift-noise spectral density d Δ f at the demodulator output in dependence of cantilever properties and settings of the signal processing electronics in the limit of a negligible tip–surface interaction and a measurement under ultrahigh-vacuum conditions. For a quantification of the noise figures, we calibrate the cantilever displacement signal and determine the transfer function of the signal-processing electronics. From the transfer function and the measured d z, we predict d Δ f for specific filter settings, a given level of detection-system noise spectral density d z ds and the cantilever-thermal-noise spectral density d z th. We find an excellent agreement between the calculated and measured values for d Δ f. Furthermore, we demonstrate that thermal noise in d Δ f, defining the ultimate limit in NC-AFM signal detection, can be kept low by a proper choice of the cantilever whereby its Q-factor should be given most attention. A system with a low-noise signal detection and a suitable cantilever, operated with appropriate filter and feedback-loop settings allows room temperature NC-AFM measurements at a low thermal-noise limit with a significant bandwidth.

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Improvement of a dynamic scanning force microscope for highest resolution imaging in ultrahigh vacuum

Cited by 24 publications

References 26 publications

Crystallographic order and decomposition of [MnIII6CrIII]3+ single-molecule magnets deposited in submonolayers and monolayers on HOPG studied by means of molecular resolved atomic force microscopy (AFM) and Kelvin probe force microscopy in UHV

Crystallographic order and decomposition of [MnIII6CrIII]3+ single-molecule magnets deposited in submonolayers and monolayers on HOPG studied by means of molecular resolved atomic force microscopy (AFM) and Kelvin probe force microscopy in UHV

Stabilization of Zinc-Terminated ZnO(0001) by a Modified Surface Stoichiometry

Thermal noise limit for ultra-high vacuum noncontact atomic force microscopy

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