Journal of Nanotechnology

Review Article

Plant-Mediated Green Synthesis of Ag NPs and Their Possible Applications: A Critical Review

Table 10

Morphology of Ag NPs, their metal sensing activity, and their detection limit.


Phytoconstituents	TEM with morphology	Metal sensing activity				Reference
Phytoconstituents	TEM with morphology	Metal ions	Operational condition	Concentration range	Detection limit	Reference

Flavonoids, phenols, sugars, and P-substituted aryl compounds	TEM 15 nm with spherical shape	Fe⁺³	Ag NPs addition of various metal ions (Al³⁺, Fe³⁺, Co²⁺, Pb²⁺, Cu²⁺, Ni²⁺, Zn²⁺, Cr³⁺, Mn²⁺, and Cd²⁺) showed selective detection towards Fe³⁺ only	30–150 μm	4.5 μm	[227]

—	TEM 15–20 nm with spherical shape	Cu²⁺	Rhodamine 6G dye fixed on the surface of Ag NPs to which 1 mL of test solution of various metal ions (Cu²⁺, Mg²⁺, K⁺, Mn²⁺, Fe³⁺, Zn²⁺, Co²⁺, and Ba²⁺) was added	10⁻⁶–10⁻¹³mol/L	10⁻¹³mol/L	[228]

Flavonoids, tannins, phenol, saponins, and glycosides	TEM 25 ± 5 nm average size with spherical shape	Hg²⁺	10⁻³ M solution of Li⁺, Al³⁺, Cr³⁺, Mn²⁺, Fe³⁺, Co²⁺, Ni²⁺, Cu²⁺, Hg²⁺, Cd²⁺, and Pb²⁺ added to equal amount of Ag NPs	10⁻⁴–10⁻⁶ M	10⁻³ M	[229]

Polyphenols and flavonoids	TEM 19.7 nm with spherical shape	Cd²⁺	Cd²⁺, Ni²⁺, Cu²⁺, Zn²⁺, Cr³⁺, Fe²⁺, Pb²⁺, Co²⁺, and Hg²⁺ solution added to Ag NPs which showed a selective detection towards Cd²⁺ only with the highest response at a pH of 6	10–90 μM	70 μM	[230]

Citric acid	TEM 10.82 nm with spherical shape	Cr³⁺	Ag NPs tested by adding different metal ions (Cu²⁺, Zn²⁺, Cd²⁺, Hg²⁺, Pb²⁺, Co²⁺, and Cr³⁺) and color change observed only for Cr³⁺ at an optimum pH of 8	10–90 μM	0.804 μM	[231]