The preparation of the electrodes for electrochemical studies was as follows: Cu–In–S annealed thin film samples were covered with a silver epoxy solution and heated to 40 ◦C for 4 h. The electric contacts of the samples were done by a copper wire, which was attached to the film with conductive silver paint. The body of the wire was encased in glass tubing and insulated using an epoxy coating that also covered thesample edges. The total area expose of the electrode was 0.5 cm. 我也觉得应该是封一部分，但以上说的就很难理解，环氧银做什么用的啊？还要覆盖，加热，但最后也说有露出部分，不明白，请指点一下
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