High-resolution scanning Kelvin nano-probe method best for Work-function measurement. 

In my case, porous metal filled with ceramic which can react at 1150 deg has to be measured. Whether high temperature SKP microscope can be used for such measurement?

SKP can be used to measure work function for the semiconductor and ceramics at room temp.

I used it for coating and Al oxide ceramics, it works fine

https://www.bio-logic.net/wp-content/uploads/bio-logic_m370.pdf

@Mohamed Gobara: I've used SKP for in-situ corrosion studies but it is not exactly suitable for high temperature work function measurement.

Dear Karunanithi Hi,

1- For inhomogeneous surfaces, the work function varies from place to place, and different methods will yield different values of the typical "work function" as they average or select differently among the microscopic work functions.

2- Many techniques have been developed based on different physical effects to measure the electronic work function of a sample. One may distinguish between two groups of experimental methods for work function measurements: absolute and relative.

3- Absolute methods employ electron emission from the sample induced by photon absorption (photoemission), by high temperature (thermionic emission), due to an electric field (field electron emission), or using electron tunnelling.

4- Relative methods make use of the contact potential difference between the sample and a reference electrode. Experimentally, either an anode current of a diode is used or the displacement current between the sample and reference, created by an artificial change in the capacitance between the two, is measured (the Kelvin Probe method, Kelvin probe force microscope) which is( in my opinion) the most suitable method to use with ceramic materials.

With all my best regards.

Baydaa Abdul Hassan