Applications - Atomic Resolution
Adama Innovations atomically sharp diamond probes offer outstanding performance with atomic resolution in vacuum, air and liquid environments. Here we demonstrate atomic resolution topography and electrical contrast for a variety of inorganic surfaces in various environments.
Atomic resolution imaging represents the pinnacle of AFM performance. This technique has been invaluable in the study of a wide range of materials at the Angstrom scale. Performance at this level is only possible when using a probe which is itself atomically sharp. Adama Innovations is, for the first time, making atomic resolution easily accessible with sharp conducting diamond probes that consistently deliver atomic resolution imaging under UHV, ambient and liquid environments. The hardness and resilience of the diamond tip enables the collection of more data at higher resolution for longer.
Figure 1 shows atomic resolution Frequency Modulation AFM (FM-AFM) imaging in LT-UHV of Si(111) and Si(111)-(7x7) reconstructions. Since all Adama Innovations probes are conducting electrical information can be collected simultaneously (See STM image - Bottom). Figure 2 shows atomic resolution STM imaging of a highly oriented pyrolytic graphite (HOPG) surface under ambient conditions.
Figure 3 demonstrates atomic resolution imaging in Milli-Q water on a mica surface using FM-AFM. Here the Adama Innovations sharp diamond probe delivers atomic resolution at both large (50 nm) and small (15 nm) scan sizes and evidence of defects in the lattice structure. In order to image with this resolution the cantilever must be driven at an amplitude smaller than a water molecule (< 0.25 nm) such that there is never a solvent molecule between the tip and the surface. The resolution demonstrated in Figure 3 is difficult to obtain in a pure water environment when using conventional silicon cantilevers. As such most researchers add salt to the solution in order to increase the force gradient near surface the surface. Such modifications of the imaging environment are not necessary when using Adama Innovations sharp conducting diamond probes. With the technology to reliably fabricate super sharp tips, in ultra-hard single crystal diamond, Adama Innovations is providing a easier path to atomic resolution imaging.
 Kilpatrick, Loh, Jarvis, Journal of the American Chemical Society, 2013, 135 (7), 2628.
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