32nd Annual Meeting of the Swiss Working Group for Surface and Interface Science
Presentation by Dr. Zhouhang Wang, “Cryogen-Free Scanning Probe Microscopy for Use in Studying Topological Insulators”
News & Events
The team at RHK Technology is excited to announce the launch of the new 9K PanScan Freedom System! Customers will now have the option to choose between the 15K and 9K versions of our cryogen-free SPM systems.
One year ago, RHK Technology launched the first commercial closed-cycle SPM system. At that time, the system could achieve a tip/sample base temperature of 18K. Over the last year, the PanScan Freedom has become the most successful microscope system in RHK’s history. During that time, our engineers, led by Dr. Byoung Choi, have worked tirelessly to further optimize the design. This resulted in the original version of the system achieving a 15K base temperature, without any sacrifice to resolution or drift.
Through our close collaborations with the researchers in this field, we knew that delivering a system that could consistently perform below 10K would open up an entire world of measurements. Both spectroscopic and morphological studies would benefit from this advancement.
The constant efforts by Dr. Choi and his team to refine every aspect of the damping, shielding, and thermal coupling allowed us to integrate a more powerful cryostat to the PanScan Freedom, once again without sacrificing performance. The strength of the design becomes immediately apparent when you see the system performing in person, with the persistent pumping of the cryostat completely absent from the spectrum analyzer data. Seeing really is believing with the PanScan Freedom!
This 9K version of the PanScan Freedom will be launched at the 62nd Annual AVS Symposium in San Jose, CA. Attendees will have the opportunity to see a live demonstration over the three-day exhibition.
If you are interested in learning more about this new technology, please contact us at [email protected]
Director of Sales and Marketing
Today’s SPMs are ever more powerful and precise. With such instruments available, your SPM Controller — not the SPM itself — now determines the actual performance of your overall system. Your existing SPM controller can impede your research if its electronics or software constrain your experimental freedom. Its jungle of noisy cables, poor dynamic range, and lost or disregarded data can limit your progress.
Conversely, an optimal Control package empowers your system to produce the most meaningful science and results. The ideal Controller must also seamlessly unite Depth of Capability and Simplicity of Operation. This is RHK’s new R9 Controller.
Watch this webinar to see what R9 can bring to your SPM research:
Advantages of fully integrated, one-box AFM and STM Control and internal lock-in amplifiers – from lowest noise to highest speed.
How wide Dynamic Range makes all measurements easier and optimizes performance without frequent adjustment of parameters.
Why viewing SPM data as time-based, not just pixel-based, reveals important insights other Controllers miss.
How to crash-proof your approaches with a high speed transient recorder.
Why LabVIEW constrains your operability and customizing of experiments and procedures, and slows down switching modes.
Non-contact AFM images showing metal-organic coordination chains of platinum(II)dipyridinyl-tetrazine on the reconstructed Au(100) surface. The model in the lower right panel is based on the molecular resolution image shown in the lower left.
Daniel Skomski, Christopher D. Tempas, Kevin A. Smith, and Steven L. Tait*
Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
RHK Technology AFM/STM UHV 7500
RHK Technology SPM 1000 Control System
D. Skomski, C. D. Tempas, K. A. Smith, and S. L. Tait
“Redox-Active On-Surface Assembly of Metal-Organic Chains with Single-Site Pt(II),”
Journal of the American Chemical Society, 136, 9862-9865 (2014).
The formation and stabilization of well-defined transition-metal single sites at surfaces may open new routes to achieve higher selectivity in heterogeneous catalysts. Organic ligand coordination to produce a well-defined oxidation state in weakly reducing metal sites at surfaces, desirable for selective catalysis, has not been achieved. Here, we address this using metallic platinum interacting with a dipyridyl tetrazine ligand on a single crystal gold surface. X-ray photoelectron spectroscopy measurements demonstrate the metal−ligand redox activity and are paired with molecular-resolution scanning probe microscopy to elucidate the structure of the metal−organic network. Comparison to the redox-inactive diphenyl tetrazine ligand as a control experiment illustrates that the redox activity and molecular-level ordering at the surface rely on two key elements of the metal complexes: (i) bidentate binding sites providing a suitable square-planar coordination geometry when paired around each Pt, and (ii) redox-active functional groups to enable charge transfer to a well-defined Pt(II) oxidation state. Ligand-mediated control over the oxidation state and structure of single-site metal centers that are in contact with a metal surface may enable advances in higher selectivity for next generation heterogeneous catalysts.