Two step green plasmonic synthesis of Gd3+/Nd3+ ions influenced ZrO2 nanoparticles for enhanced in-vitro antibacterial, antifungal and antidiabetic activities

•ZrO2/Gd2O3/Nd2O3 nanomaterials were synthesised using green approach.•Corallo carpus epigaeus was used as reducing as well as capping agent.•ZrO2 nanoparticles possess 10–12 nm in size.•The nanomaterials exhibited excellent antimicrobial behaviour.•The prepared nanomaterials have remarkable antidiabetic effect.