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Investigating Cu Oxidation: Effects of Thermal Treatment on Electrical Conductivity and Surface Color

This study examines the oxidation of copper (Cu) under various thermal conditions. Initial oxidation produced a thick Cu2O layer (~15 nm) after 48 hours at 125°C, resulting in a purple surface with no loss of electrical conductivity. However, extending the treatment to 72 hours at 200°C resulted in a reddish-brown surface with potential CuO regions and unclear layer thickness. Initial low conductivity improved after exposure to less than 20 sparks. Continuing tests suggest a possible increase in effectiveness with greater thickness despite challenging initial results.

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Investigating Cu Oxidation: Effects of Thermal Treatment on Electrical Conductivity and Surface Color

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  1. Cu oxidized – ‘‘thick’’ layer • previous oxidations: 48h at 125°C • purple surface • ~ 15 nm of Cu2O layer • no loss of electrical conductivity • new parameters: 72h at 200°C • reddish brown surface (or brownish red?), + black regions (CuO?) • layer thickness = ? • low electrical conductivity at the beginning (~ MW), conductive after < 20 sparks

  2. Cu oxidized – ‘‘thick’’ layer • similar results until now (tests are still running) possible slight gain with increased thickness

  3. … the first spot was really bad at the beginning (with a completely oxidized anode) Cu oxidized – ‘‘thick’’ layer • BUT...

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