RHK PanScan

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Image of the Month
Posted Date: March 1, 2008
iotm-march-2008

Microscope:
Homebuilt STM

Controls:
SPM 1000 Control System featuring XPMProTM

Description :
Self-assembled monolayer of 1,3,5-benzenetribenzoic acid. The STM image was obtained in-situ at the liquid-graphite interface with nonanoic acid as solvent. Intermolecular hydrogen bonds facilitate the formation of a nano-porous supramolecular network, which can be utilized for the lateral ordering of nanoscale objects. The lattice parameter amounts to 3.2 nm and the cavity diameter is 2.8 nm.

(further reading: J. Phys. Chem B 110, 10829-10836 (2006))

Courtesy of:
Dr. Lorenz Kampschulte and Dr. Markus Lackinger, Department for Earth and Environmental Science, Ludwig-Maximilians-University Munich

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Image of the Month
Posted Date: February 1, 2008
institution

Microscope:
PicoSPM

Controls:
SPM 1000 Control System featuring XPMProTM

Description :
Imaging conditions: Oxide-sharpened Si3N4 probes (kavg = 0.5 N/m). Image acquired in ethanol. Applied force for nanografting: 4.8 nN. Image size: 470 x 470 nm2

Topograph of an octadecanethiol self-assembled monolayer on Au (111) after writing patterns of 11-mercaptoundecanoic acid via nanografting. Patterns are generated when the AFM tip displaces the matrix molecules under high force. New alkanethiol molecules from solution assemble immediately onto the shaved areas of the surface, following the track of the tip. The five interconnected rings have a line width of 10 nm. The dark color of the patterns indicates areas of the shorter alkane chain of 11-mercaptoundecanoic acid compared to the surrounding octadecanethiol monolayer.

Courtesy of:
Johnpeter Ngunjiri and Jayne Garno Chemistry Department Louisiana State University

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Image of the Month
Posted Date: January 1, 2008
institution

Microscope:
RHK UHV300 STM

Controls:
RHK Technology SPM 1000 featuring XPMProTM

Description:
Imaging condition: PtIr tip, bias voltage 0.3 V, tunneling current 1 nA, 300 K Image sizes: 125×125 nm2, 84×84 nm2 Image description: The sulfite (SO3) and sulfate (SO4) intermediates on
Ag(111) after reacting sulfur dioxide with the Ag(111)-p(4×4)-O surface oxide at 300 K. Surface sulfite orders as the (2√3×2√3)R30° hexagonal structures, and surface sulfate forms the stripe structures. The topographic nanorestructuring of the surface in the reaction shows unambiguously the mass transport and the redistribution of the silver adatoms in the adsorbate layer. The structures of sulfite and sulfate intermediates all contain the incorporated silver adatoms. The monoatomic silver islands are formed by released silver adatoms in the original surface oxide layer.

Courtesy of:
Ling Zhou, Weiwei Gao, and Robert J. Madix – School of Engineering and Applied Sciences, Harvard University

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Image of the Month
Posted Date: November 1, 2007
iotm-november-2007

Microscope:
RHK UHV7500 AFM/STM

Controls:
RHK Technology SPM 1000 featuring XPMProTM and the PLLPro AFM Controller

Description:
Molecular resolution of a monolayer of the organic molecule PTCDA (perylene-tetracarboxylic-dianhydride) obtained in non-contact mode using a frequency shift of -32 Hz for the setpoint. The cantilever oscillation amplitude was 34 nm and the data was obtained at room temperature.

Courtesy of:
Tino Roll, AG Schleberger, Universität Duisburg-Essen

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