Disclosed are methods for making surface plasmon resonance-capable arrays wherein molecules, such as proteins or nucleic acids, or cells, are adhered to a metal substrate. The metal substrates are modified by depositing an .omega.-modified alkanethiol monolayer to the substrate and then contacting the .omega.-modified monolayer with a heterobifunctional linking compound. Biomolecules or cells can then be attached to the heterobifunctional linking compound. Also disclosed are arrays wherein glutathione-containing molecules are immobilized on the substrate and GST-containing molecules are then specifically immobilized onto the substrate, taking advantage of the affinity between glutathione and GST.