20research through innovation in non-contact atomic force microscopy.Professor Franz Josef GiessiblInstitute of Experimental and Applied Physics,University of Regensburg, GermanyResearch Acheivement TitleContribution to nanomaterial research through innovations in non-contact atomic force microscopy”Outline of Awarded Research AchievementProf. Dr. Franz J. Giessibl achieved atomic resolution with non-contact atomic force microscopy (AFM) for the first time in the world in 1995. He then developed the qPlus sensor(1), a self-sensing force sensor originally based on a quartz tuning fork, significantly enhancing the capabilities of non-contact AFM. In non-contact AFM, the probe oscillates near the sample surface and the minute forces between the sample surface and the probe are detected. Compared to the previously-used cantilever sensors, the qPlus sensor has a very high spring constant, enabling it to detect short-range forces with high sensitivity at amplitudes as small as tens of picometers, which was unattainable with cantilever sensors. This has dramatically improved the contrast at the atomic level. Using the self-sensing qPlus sensor, he also developed a scanning probe microscope capable of operating at extremely low temperatures, which is challenging with cantilever sensors, and proposed the necessary theories for high-resolution measurements. He has demonstrated the significance of these developments through numerous studies on nanomaterials.Ripple Effects of Achievements on Academia and IndustryAtomic force microscopes utilizing the qPlus sensor developed by Prof. Dr. Franz J. Giessibl have been commercialized and over 500 units have been sold worldwide. The qPlus sensor is incorporated in nearly all atomic force microscopes operating at extremely low temperatures and ultra-high vacuum. The use of these instruments has significantly advanced academic fields of surface science, surface physics, surface chemistry, and the like. Notably, the use of the qPlus sensor has enabled the observation of the internal structure of molecules for the first time, making low-temperature atomic force microscopes equipped with the qPlus sensor essential tools in surface chemistry.Professor Franz J. Giesible from the University of Regensburg was honored for his contributions to nanomaterials 1. 2. The spring constant of a cantilever ranges from 0.1 to 100 N/m, whereas the qPlus sensor has a spring constant of 1000 N/m, making it much stiffer. This stiffness allows for smaller amplitudes and makes the qPlus sensor suitable for detecting short-range interaction changes. For example, it can improve the measurement accuracy of interactions that are highly distance-dependent, such as the simultaneous measurement of tunneling currents.qPlus sensor: In conventional AFM, a cantilever is vibrated, and the changes in its resonance characteristics due to interaction with the sample surface are detected using a laser or similar method to obtain information about the sample surface. On the other hand, the qPlus sensor is a force sensor modified from a watch quartz oscillator (in other words, a force sensor based on a tuning fork quartz oscillator), which unlike a cantilever, enables it to detect changes by itself. It is therefore called a self-sensing force sensor.NIMS Award 2024 WinnerResearch Summary and Impact on the Adacemic and Industrial Sections[Field of Research]Atomic force microscopy
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