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In situ SEM DC experiments in Uppsala – update 17 June 2013

In situ SEM DC experiments in Uppsala – update 17 June 2013. Tomoko Muranaka. 3D piezo positioner installed Oct 2012. What we can do: Target measurement spot 2D scanning Searching weak point. Plan. Field emission measurement: Grain orientation dependence

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In situ SEM DC experiments in Uppsala – update 17 June 2013

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  1. In situ SEM DC experiments in Uppsala – update 17 June 2013 Tomoko Muranaka

  2. 3D piezo positioner installed Oct 2012 • What we can do: • Target measurement spot • 2D scanning • Searching weak point

  3. Plan • Field emission measurement: Grain orientation dependence • Field emission measurement: Stability measurement • Breakdown: EBSD, Evidence of dislocation (?)

  4. Grain orientation dependence • (111) and (001) grains are chosen thanks to EBSD done by Anité. • One reference spot to determine the gap (1um) on the (111) grain. • Three measurement spots on each grains. • Voltage that the measured current exceeded 10nA were 400 to 800 MV/m on each grains.

  5. Grain identification

  6. But… • Anode surface was ugly. • Anode holder was probably loose due to deformation of other side of the tip (mechanical cut) Solution: • KOH etching • Diamond cut before cleaning

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