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N‐Acetyl‐l‐cysteine (NAC)‐capped poly(methyl methacrylate)‐b‐polycaprolactone block copolymer (PMMA‐b‐PCL‐NAC) was prepared using the previously described one‐pot photoinduced sequential CuAAC/thiol‐ene double click procedure. PMMA‐b‐PCL‐NAC had previously shown good applicability as a matrix for cell adhesion of cells from the Vero cell line (African green monkey kidney epithelial). Here, in this work, PMMA‐b‐PCL‐NAC served as an excellent immobilization matrix for biomolecule conjugation. Covalent binding of RGD (R: arginine, G: glycine, and D: aspartic acid) peptide sequence onto the PMMA‐b‐PCL‐NAC‐coated surface was performed via EDC chemistry. RGD‐modified PMMA‐b‐PCL‐NAC (PMMA‐b‐PCL‐NAC‐RGD) as a non‐toxic cell proliferation platform was used for selective “integrin αvβ3‐mediated cell adhesion and biosensing studies. Both optical and electrochemical …