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Hi Mithun, Can you take a screenshot of your settings and send to my email: chunzeng.li@bruker-nano.com Chunzeng
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Hi Mithun, Having the EFM HOLDER AND SCM-PIT tips are enough for you to perform surface potential on Multimode; you do not need to apply voltage externally. Surface potential measurement has been done on organic solar cell (BHJ) and its component materials; make sure you electrically connect the underlying conductive substrate (e.g. ITO) to the sample
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Dave, I would take a guess, Diiodomethane (CH2I2) should be chemically similar to Dichloromethane (CH2Cl2, also called methylene Dichloride). By looking up the chemical compatability list in the Appendix A of 004-1016-000 ELECTROCHEMICAL SPM MANUAL VERSION 7-C, methylene Dichloride is fairly compatible with the Dimension Fluid Cell. Chemical 304 SS
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Fantastic! Chunzeng
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Hi Sheila, The probe is critical for surface potential measurements, it is required to have a well defined work function and be robust. SCM-PIT probe from Bruker has a Pt-Ir coating which meets these criteria. Also Rocky Mountain Nanotech offers solid Pt probes (25Pt300B) which has the advantage that tip material thus its work function does not change
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Dave, You can see surface potential variation arising from the different doping levels on the SCM sample (SRAM), but it is not an ideal sample to check/calibrate KPFM. The problem with semiconductor samples in general is that some surface states can inevitably appear in the bandgap which can mask the fermi-energy level of the semiconductor and dictate
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On Multimode, we do not recommend to apply votage above +/-12V. If you want to try anything above +/-12V, make sure you have a current limiting resistor in series to make sure current is kept below 10mA. A safer way to do this is isolate the sample disk from the piezo cap (for instance using scotct tape), and make the electrical connection between the
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Scott, I figure you probably did not receive my later responses thru your gmail either. Please check whether they are put in SPAM. Also, you can provide an university sponsored email address so our communication will not be disrupted. Best Chunzeng
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The C-AFM polarity convention with Multimode is: positive current means the current is flowing from the sample to the tip. Another way to say this is: if you use a positive sample bias, you would read a posistive current. When you say there is "no" bias applied, ideally that means 0 V. But no system is ideal, there is always some noise in
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Hi Scott, I sent to your Gmail on 2/5 and 2/8 with a new .dll and the following note: z-bar may not update properly while macro is running. Use an oscilloscope to check the signal; or capture the height (with offline planefit set to none) image to see whether z actually moves. Try this .dll, and let me know how it works. Chunzeng