Hello Dear concerned polymer scientist or technical fellows, I am looking for a four point probe measurement system to buy, which will be easier to use and test my polymer hydrogel may be in both dry and wet condition. I am not sure if I can use Four point probe to see the surface resistivity of wet hydrogel. So any kind of idea, link, company name or help will be highly and cordially appreciated. I don't have any rough idea about how much the surface resistivity of my hydrogel could be. so possibly looking for some suggestion (the more resistivity range the better). Eagerly waiting for your response. Thanks
4 probes should be adequate for you ( see Jandel products), but if your sample is fragile you may have to change the probe tips or pressure to measure properly
Following Vincent suggestion, four-point probe is definitely a right tool to use. However, if you want to have a rough idea for your processing, then you could use a multimeter with a fixed distance to measure different samples, so you can relatively compare the resistance reading on the meter among samples. Please be aware of this only for a rough idea during processing.
Hello Md Saleh Akram Bhuiyan
further to the answers of Vincent Immer and Xuhua Wang , I would suggest purchasing a source measure unit (SMU), then purchase a 4 point probing station.
As for the SMU, we use a Keithly 2450. We then connect this to a S-302 manual probing station from Singatone with the SP4 probe head:
https://www.signatone.com/applications/pro_4.asp
http://lucaslabs.com/s302.html
I would also suggest looking at MDC's and Everbeing's products:
https://www.mdc-europe.com/services/four-point-probe-resistivity-measurements/
https://everbeingprober.com/products/four-point-probe/
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