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Hi I'm using TESPA probe (k: 42N/m) to measure Young's Moduls of HOPG material that I bought. There is a QNM sample (HOPG), so first I needed to calibrate with this sample via relative method. I found that in the QNM manual, suggested probes for HOPG was TESPA, diamond in chapter 3. Later I found that in the QNM manual chapter 1 (5 pages), RTESPA
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Thank you for your answer. I also have questions about the calibration. For the calibration, we need three parameters; deflection sensitivity, spring constant, tip radius. I can follow the manual to get the deflection sensitivity. Let me talk about the absolute method first. 1. For the spring constant, I put the nominal value from the manufacturer.
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Hi, I was also wondering how to get the Young's modulus using DMT model. It seems that this fit is based on the flat substrate, right? If I use a sphere particle sample on the flat substrate, can I use this same approach to calculate the Young's modulus? I think it is defined as 1/R=1/r_tip+1/r'_sample. If r'_sample is flat, 1/R=1/r_tip