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The potential of ribonucleic acid (RNA) as both informational and ligand binding molecule have opened a scenario in the development of biosensors. An aminated diamond-based RNA aptasensor is presented for human immunodeficiency virus (HIV) trans-activator of transcription (Tat) peptide protein detection that not only gives a labeled or label-free detection method but also provides a reusable platform for a simple, sensitive, and selective detection of proteins. The immobilized procedure was based on the binding interaction between positively charged amine terminated diamond and the RNA aptamer probe molecules with the negatively charged surface carboxylic compound linker molecule such as terephthalic acid.