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In surface‐enhanced Raman spectroscopy (SERS), 2D materials are explored as substrates owing to their chemical stability and reproducibility. However, they exhibit lower enhancement factors (EFs) compared to noble metal‐based SERS substrates. This study demonstrates the application of ultrathin covellite copper sulfide (CuS) as a cost‐effective SERS substrate with a high EF value of 7.2 × 104. The...