Deposition of nanomaterials: A crucial step in biosensor fabrication

•Nanomaterials deposition onto a conductive electrode is a crucial step for obtaining improved performance from the constructed biosensors.•Different methodologies are discussed to create matrix of nanomaterials that ensures proper contact between material and electrode surface.•An easy, stable, and reproducible nanomaterial deposition method is crucial for the realization of fabricated biosensor devices’ performance.•Key challenges for optimum deposition and the ability of deposited nanomaterials to address these challenges is critiqued.