Antibacterial activity of Nephrolepis cordifolia mediated SiO₂, SiO₂@Au, SiO₂@Ag and SiO₂@Au–Ag NCs using disc diffusion method.

	Concentration (mg mL−1)	Zone of inhibition (ZOI) in mm
		SiO2	SiO2@Au	SiO2@Ag	SiO2@Au–Ag
Gram –ve bacteria E. coli (KCTC-1924)	50	—	—	—	7	For positive control ampicillin (200 mg mL−1) ZOI = 23 mm
	100	—	—	—	13
	150	—	—	7	18
	200	—	10	11	21
Gram +ve bacteria S. aureus (KCTC-1916)	50	—	—	—	7	For positive control ampicillin (200 mg mL−1) ZOI = 18 mm
	100	—	—	—	10
	150	—	—	6.5	13
	200	—	—	12	14