High-performance probe for STM
!! No troublesome needle processing required *2, stable STM measurements possible!! It has been confirmed that atomic images can be obtained stably without the need for high-temperature heating treatment during HOPG observation in the atmosphere and gold observation in ultra-high vacuum. *2: Limited to nickel and platinum-iridium probes. However, if the observation surface is active, heating for degassing is recommended. - STM probes do not tolerate carbon deposition associated with SEM observation, so only extraction SEM inspection will be performed.
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basic information
The stability of measurements in STM (Scanning Tunneling Microscopy) is greatly affected by the quality of the probe. In other words, variations in the tip diameter, contamination of the probe surface, and failures in cleaning processes often result in poor STM measurement results. To address these issues, we have successfully developed STM probes made of nickel and platinum-iridium using an electro-polishing method that minimizes contamination and achieves a sharp tip diameter. We offer metal probes that provide a level of stability that was previously unattainable. Additionally, we also provide traditional tungsten probes. Custom coatings of gold, silver, and other materials for nickel probes are also available upon request.
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Applications/Examples of results
Observation of HOPG in the atmosphere and observation of gold in ultra-high vacuum. Other.
Line up（3）
| Model number | overview |
|---|---|
| P-100WS | 【Tungsten Probe】 Tip Shape: Conical Wire Diameter: 0.25 mm dia. Tip Curvature Radius: 35 nm or less Material: Polycrystalline Tungsten |
| P-100Ni (S) | 【Nickel Probe※1】 Tip Shape: Conical Wire Diameter: 0.25 mm dia. Tip Curvature Radius: 25 nm or less Material: Polycrystalline Ni ※1 STM observation in a magnetic field is not possible |
| P-100PtIr (S) | 【Platinum Iridium Probe】 Tip Shape: Conical Wire Diameter: 0.5 mm dia. Tip Curvature Radius: 20 nm or less Material: Polycrystalline Platinum Iridium |
Company information
Unisoku was established in 1974 with the aim of becoming a creator of unique measuring instruments. It is a manufacturer that primarily develops and sells its own ultra-high vacuum scanning probe microscopes (SPM) to universities, public institutions, and private companies and research institutes. Over the years, it has developed and commercialized advanced measuring instruments such as high-speed spectroscopic measurement devices and scanning tunneling microscopes, delivering them to universities and research institutions both domestically and internationally, and its technological content has received high praise from researchers in the field of basic research. In recent years, scanning probe microscopes have significantly improved in performance and multifunctionality, particularly as a means of observing sample surfaces at the atomic level. Their applications are expanding mainly from the field of physics to chemistry and bio-related fields, making them indispensable tools in nanotechnology and nanoscience.
