Collect your DOIs with a Scopus author search
Export documents to an EndNote library using the default Scopus format which includes DOI
Create a new Output Style in EndNote consisting only of DOI. This takes several steps.
3a. EDIT - Output Styles - New Style...
3b. FILE - Save As <a new style called DOI>
3c. From the tree at left select Bibliography - Templates
3d. Click on the blue Reference Types button then check off each reference type you are likely to identify with a DOI
3e. Click on the blue Select Fields button at top right and select DOI. Then repeat with the next reference type.
3f. Close, Save.