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6-Phosphonohexanoic Acid is used in the organophosphonate biofunctionalization of diamond electrodes.

6-Phosphonohexanoic acid (PHA) is an alkylphosphonic acid that forms a self-assembled monolayer (SAM) on a variety of surfaces. It has carboxylic groups that facilitate the grafting of the surface atoms while the phosphonic groups allow the surface modification of the substrate material.