Green nanotechnology: a review on green synthesis of silver nanoparticles — an ecofriendly approach

Figures & data

Figure 1 Different approaches to nanomaterial (NM) classification.

Abbreviation: NPs, nanoparticles.

Table 1 Chemical and physical synthesis of AgNPs

Type	Reducing agent	Characterization	Biological activities	Reference
Chitosan-loaded AgNPs	Polysaccharide chitosan	TEM, FTIR, XRD, DSC, TGA	Antibacterial	^Citation114
PVP-coated AgNPs	Sodium borohydrine	UV-vis, TEM, EDS, DLS, Fl-FFF	NANA	^Citation115
AgNPs	Ascorbic acid	UV-vis, EFTEM	Antibacterial	^Citation116
AgNPs	Hydrazine, D-glucose	UV-vis, TEM	Antibacterial	^Citation117
Polydiallyldimethylammonium chloride_ and polymethacrylic acid–caped AgNPs	Methacrylic acid polymers	UV-vis, reflectance spectrophotometery	Antimicrobial	^Citation118

Abbreviations: NPs, nanoparticles; TEM, transmission electron microscopy; FTIR, Fourier-transform infrared; XRD, X-ray diffraction; DSC, differential scanning calorimetry; TGA, thermogravimetric analysis; UV-vis, ultraviolet-visible (spectroscopy); EDS, energy-dispersive spectroscopy; DLS, dynamic light scattering; Fl-FFF, flow field-flow fractionation; EFTEM, energy-filtered TEM; NA, not applicable.

Figure 2 Various approaches to the synthesis of Ag nanoparticles (NPs).

Table 2 Plant-mediated synthesis of AgNPs

Plant (Family)-Local Name	Part	Characterization	Phytoconstituents Present in plant	Size of AgNPs	Shape of AgNPs	Reference
Acacia nilotica (Fabaceae) — babul	Pod	UV-vis, HRTEM, FTIR, DLS, EDS, XRD, ζ-potential	Gallic acid, ellagic acid, epicatechin, rutin	HRTEM (20–30 nm)	Distorted spherical	^Citation151
Ocimum sanctum (Lamiaceae) — tulsi	Fresh leaf	UV-vis, TEM, XRD, FTIR	Alkaloids, glycosides, tannins, saponins, aromatic compounds	TEM (3–20 nm, average 9.5 nm)	Spherical	^Citation152
Citrullus colocynthis (Cucurbitaceae) — bitter apple	Fresh leaf	UV-vis, FTIR, AFM	NA	AFM (31 nm)	Spherical	^Citation153
Coccinia grandis (Cucurbitaceae) — ivy gourd	Fresh leaf	UV-vis, HRTEM, SEM, XRD, FTIR, TGA, EDS	Triterpenoids, alkaloids, tannin	TEM (20–30 nm)	Spherical	^Citation154
Pterocarpus santalinus (Fabaceae) — sandalwood	Fresh leaf	UV-vis, SEM, XRD, FTIR, AFM, EDX	NA	SEM (20–50 nm, average 20 nm), AFM (41 nm)	Spherical	^Citation155
Coleus aromaticus (Lamiaceae) — borage	Fresh leaf	UV-vis, XRD, FTIR, EDAX	Carvacrol, caryophyllene, patchoulene, flavonoids	SEM (40–50 nm)	Spherical	^Citation156
Jatropha curcas (Euphorbiaceae) — physic nut	Seed	UV-vis, HRTEM, XRD	NA	HRTEM (1,550 nm) at 10^–3 M and 30–50 nm at 10^−2 M	Spherical (at 10^–3 M), unevenly shaped (at 10^–2 M)	^Citation157
Melia dubia (Meliaceae) — malai vembu	Fresh leaf	UV-vis, TEM, SEM–EDS, XRD	Alkaloids, carbohydrates, glycosides, phenolic compounds, tannins, gums, mucilages	XRD (average 7.3 nm)	Irregular, but mostly spherical	^Citation158
Capsicum annuum (Solanaceae) — peppers	Fresh leaf	UV-vis, TEM, FTIR, SAED, XRD, XPS, CV, DPV	Proteins/enzymes, polysaccharides, amino acids, vitamins	TEM (10±2 nm at 5 hours)	Spherical	^Citation159
Annona squamosa (Annonaceae) — sweetsops	Young leaf	UV-vis, XRD, TEM, FTIR, EDS, ζ-potential	Glycoside, alkaloids, saponins, flavonoids, tannins phenolic compounds, phytosterols	TEM (20–100 nm)	Spherical	^Citation160
Camellia sinensis (Theaceae) —tea	Dried leaf	XRD, TEM, FTIR	NA	Debye–Scherrer equation (3.42 nm), TEM (2–10 nm, average 4.06 nm)	Spherical	^Citation161
Citrus sinensis (Rutaceae) — orange	Peel extract	UV-vis, TEM, FESEM, FTIR, XRD, EDAX	Vitamin C, flavonoids, acids, volatile oils	XDS (33±3 nm at 25°C, 8±2 nm at 60°C,), HRTEM (35±2 nm)	Spherical	^Citation38
Lantana camara (Verbenaceae) — wild/red sage	Fresh leaf	UV-vis, TEM, FESEM, FTIR, XRD, XPS, AFM, SAED	Phenolics, flavonoids, terpenoids, alkaloids, lipids, proteins, carbohydrates	FESEM (34 nm), AFM (17–31 nm), TEM (14–27 nm), XRD (11–24 nm), SAED (~14 nm)	Spherical	^Citation162
Coriandrum sativum (Apiaceae) — coriander	Fresh leaf	UV-vis, TEM, FTIR, XRD, Z-scan techniques	Carotene, thiamine, riboflavin, niacin, oxalic acid, sodium	TEM (8–75 nm, average 26 nm)	Spherical	^Citation163
Aloe vera (Asphodelaceae) — first-aid plant	Fresh leaf	UV-vis, TEM, FTIR, AFM, NIR absorption spectroscopy	NA	TEM (15.2±4.2 nm)	Spherical	^Citation164
Memecylon edule (Melastomataceae) — delek bangas	Shade-dried leaf	UV-vis, TEM, SEM, FTIR, EDAX	Triterpenes, tannins, flavonoids, saponin	TEM (50–90 nm)	Square	^Citation165
Hibiscus rosa-sinensis (Malvaceae) — rose mallow	Leaf	UV-vis, TEM, FTIR, XRD, SAED	Proteins, vitamin C, organic acids (essentially malic acid), flavonoids, anthocyanins	TEM (average size 13 nm), Scherrer equation (13 nm)	Spherical	^Citation166
Cinnamomum camphora (Lauraceae) — camphorwood	Fresh leaf	UV-vis, TEM, SEM, XRD, AFM	NA	TEM (55−80 nm, average diameter 64.8 nm)	Quasispherical	^Citation55
Piper longum (Piperaceae) — pipli	Dried fruit powder	UV-vis, SEM, FTIR, DLS	Piperidine, alkaloids, tannins, dihydrostigmasterol, sesamim, terpenines	DLS (15–200 nm, average 46 nm)	Spherical	^Citation167
Sesbania grandiflora (Fabaceae) — hummingbird tree	Fresh leaf	UV-vis, FE-TEM, FTIR, XRD, SAED	Carboxylic compounds, flavonoids, terpenoids, polyphenols	TEM (10–50 nm, average 24.1 nm), XRD (18.52 nm)	Spherical	^Citation168
Moringa oleifera (Moringaceae) — drumstick tree	Fresh stem bark	UV-vis, TEM, HRSEM, FTIR, DLS, AFM	Phenols, β-sitosterol, caffeoylquinic acid, quercetin, kaempferol	HRTEM (average size 40 nm), DLS (38 nm), SEM (40 nm)	Spherical and pentagonal	^Citation169
Origanum vulgare (Lamiaceae) — oregano	Leaves	UV-vis, FESEM, FTIR, XRD, DLS, ζ-potential	NA	FESEM (63–85 nm), Scherrer formula (65 nm), DLS (136±10.09 nm)	Spherical	^Citation170
Vitex negundo (Lamiaceae) — Chinese chaste tree	Fresh leaf	UV-vis, TEM, FESEM, FTIR, XRD, EDX	Alkaloids, glycosides, flavonoids, phenolic compounds, reducing sugars, resin tannins	TEM (5–47 nm)	Spherical	^Citation171
Tephrosia tinctoria (Fabaceae) — alu pila	Shade dried stem extract	UV-vis, TEM, SEM, FTIR	Phenol, flavonoids	TEM (73 nm)	Spherical	^Citation172
Mimusops elengi (Sapotaceae) — Spanish cherry	Seed	UV-vis, TEM, FTIR, XRD, HPLC	Ascorbic acid, gallic acid, pyrogallol, resorcinol	TEM (12.8–30.48 nm)	Spherical	^Citation173
Alternanthera dentate (Amaranthaceae) — Joseph’s coat	Leaf	FTIR, TEM, SEM, XRD	NA	SEM (50–100 nm)	Spherical	^Citation174
Sesuvium portulacastrum (Aizoaceae) — salt marsh	Leaf	UV-vis, TEM, FTIR, XRD	NA	TEM (5–20 nm)	Spherical	^Citation175
Dalbergia spinosa (Faboideae) — liana	Shade-dried leaf	UV-vis, TEM, FTIR, DLS	Flavonoids, isoflavonoids, neoflavonoids, steroids, terpenoids	TEM (18±4 nm)	Spherical	^Citation176
Sambucus nigra (Adoxaceae) — European black elderberry	Frozen fruit	UV-vis, FTIR, XRD, ζ-potential	Polyphenol anthocyanins	TEM (20–80 nm)	Spherical	^Citation177
Millingtonia hortensis (Bignoniaceae) — neem	Dried leaf	NA	NA	2–8 nm	NA	^Citation178
Syzygium cumini (Myrtaceae) — jamun	Air-dried seed	UV-vis, SEM, XRD, FTIR, DLS, ζ-potential, HPLC	Gallic acid, p-coumaric acid, quercetin, 3,4-dihyroxybenzoic acid	SEM (40–100 nm), average 43.02 nm, Z-average 43±1.25	Irregular spherical contour	^Citation179
Mukia maderaspatana (Cucurbitaceae) — Madras pea pumpkin	Fresh leaf	UV-vis, FESEM, FTIR, XRD, ART	NA	FESEM (13–34 nm), Debye–Scherrer formula (64 nm)	Spherical	^Citation180
Nelumbo nucifera (Nelumbonaceae) — sacred lotus	Fresh leaf	UV-vis, TEM, SEM, FTIR, XRD	Betulinic acid, steroidal pentacyclic triterpenoid, procyanidins	TEM (25–80 nm, average 45 nm), SEM (25–80 nm)	Spherical (TEM), triangular (SEM)	^Citation181
Rhizophora mucronata (Rhizophoraceae) — mangrove	Leaf	UV-vis, FTIR, XRD, AFM	Alkaloids, flavonoids, polyphenols, terpenoids	AFM (60–95 nm)	Spherical	^Citation182

Abbreviations: CV, Cyclic voltammograms; ART, total reflectance technique; NPs, nanoparticles; UV-vis, ultraviolet-visible spectroscopy; TEM, transmission electron microscopy; SEM, scanning electron microscopy; FESEM, field-emission SEM; HREM, high-resolution transmission electron microscopy; XRD, X-ray diffraction; FTIR, Fourier-transform infrared spectroscopy; AFM, atomic force microscopy; HPLC, high-performance liquid chromatography; DLS, dynamic light scattering; EDX, energy-dispersive X-ray (spectroscopy); EDAX, ED X-ray analysis; SAED, selected-area electron diffraction; TGA, thermogravimetric analysis; NA, not available; CV, ; ART, .

Figure 3 Plant mediated synthesis of AgNPs.

Table 3 Bacteria-mediated synthesis of AgNPs

Reducing agent: bacterial strain	Characterization	Size	Shape	Gram^+/ Gram^–	Reference
Serratia nematodiphila	UV-vis, SEM, EDS	SEM (65–70 nm)	Spherical	Gram^+	^Citation186
Bacillus stearothermophilus	UV-vis, TEM, FTIR, DLS	TEM (9.96–22.7 nm, average 14±4 nm)	Spherical	Gram^+	^Citation187
Bacillus strain CS11	UV-vis, TEM	TEM (42–92 nm)	NA	Gram^+	^Citation188
Exopolysaccharide-producing strain Leuconostoc lactis	UV-vis, TEM, SEM, AFM, XRD, TGA-DTA, Raman spectroscopy	TEM (30–200 nm, average 35 nm), AFM (average 30 nm)	Spherical	Gram^+	^Citation189
Escherichia coli	NA	NA	NA	Gram^−	^Citation190
Streptomyces hygroscopicus	UV-vis, TEM. EDXA, FE XRD, BioAFM	TEM (20–30 nm)	More or less spherical	Gram^+	^Citation191
Pediococcus pentosaceus, Enterococcus faecium, Lactococcus garvieae	NA	NA	NA	NA	^Citation192
Bacillus cereus, B. subtilis, Escherichia coli, Enterobacter cloacae, Klebsiella pneumonia, Lactobacillus acidophilus, Staphylococcus aereus, Pseudomonas aeroginosa	UV, TEM, EDS	TEM (28.2−122 nm, average 52.5 nm)	NA	Gram^+ and Gram^–	^Citation193
Morganella morganii RP42	UV, TEM, XRD, SAED	TEM (10–50 nm)	Quasispherical	Gram^−	^Citation194
Escherichia coli	UV, FTIR, XRD	TEM (average 50 nm)	Spherical	Gram^−	^Citation195
Pseudomonas antarctica, P. proteolytica, P. meridiana, Arthrobacter kerguelensis, A. gangotriensis, Bacillus indicus, B. cecembensis	UV, TEM, AFM	TEM (6.1±2.8 nm), AFM (4.6–13.3 nm)	Spherical	Gram^+ and Gram^−	^Citation196
Staphylococcus aureus	UV, AFM	AFM (160–180 nm)	Irregular	Gram^+	^Citation197
Bacillus brevis (NCIM 2533)	UV-vis, SEM, FTIR, AFM, TLC	SEM (22–60 nm, average 41 nm), AFM (average 68 nm)	Spherical	Gram^+	^Citation198

Abbreviations: NPs, nanoparticles; UV-vis, ultraviolet-visible (spectroscopy); TEM, transmission electron microscopy; SEM, scanning electron microscopy; FESEM, field-emission SEM; HRSEM, high-resolution TEM; XRD, X-ray diffraction; FTIR, Fourier-transform infrared (spectroscopy); AFM, atomic force microscopy; HPLC, high-performance liquid chromatography; DLS, dynamic light scattering; EDX, energy-dispersive X-ray (spectroscopy); EDAX, ED X-ray analysis; SAED, selected-area electron diffraction; TGA, thermogravimetric analysis; NA, not available; TLC, thin-layer chromatography.

Table 4 Alga-mediated synthesis of AgNPs

Reducing agent: alga strain	Characterization	Size	Shape	Algae type	Macro/microalgae	Reference
Sargassum wightii Greville	UV, TEM, XRD, FTIR	TEM (8−27 nm)	Spherical	Brown	Macroalgae	^Citation201
Caulerpa racemosa	UV, TEM, FTIR, XRD	TEM (10 nm)	Spherical and triangular	Green	Macroalgae	^Citation202
Polysaccharide extracted from algae: Pterocladia capillacae, Jania rubins, Ulva fasciata, Colpmenia sinusa	UV, TEM, FTIR	TEM (7, 7, 12, and 20 nm for U. fasciata, P. capillacae, J. rubins, and C. sinusa, respectively)	Spherical	Red and green	Macroalgae	^Citation203
Chaetomorpha linum	UV-vis, SEM, FTIR	SEM (3–44 nm, average ~30 nm)	Varied	Green	Macroalgae	^Citation204
Chaetoceros calcitran, Chlorella salina, Isochrysis galbana, Tetraselmis gracilis	UV, SEM	SEM (53.1–73.9 nm)	NA	Green	Microalgae	^Citation199
Gelidium amansii	UV-vis, SEM, FTIR	SEM (27–54 nm)	Spherical	Red	Macroalgae	^Citation205

Abbreviations: NPs, nanoparticles; UV-vis, ultraviolet-visible (spectroscopy); TEM, transmission electron microscopy; SEM, scanning electron microscopy; XRD, X-ray diffraction; FTIR, Fourier-transform infrared (spectroscopy).

Table 5 Fungus-mediated synthesis of AgNPs

Fungal species used	Characterization	Size	Shape	Reference
Fusarium oxysporum	UV-vis, TEM, FTIR	TEM (5–50 nm)	Spherical and few triangular	^Citation206
Verticillium	UV-vis, TEM, SEM, EDX	TEM (25–12 nm)	Spherical	^Citation207
Aspergillus fumigatus	UV-vis, TEM, XRD	TEM (5−25 nm)	Spherical and triangular	^Citation208
Penicillium fellutanum	UV-vis, TEM	TEM (5−25 nm)	Spherical	^Citation209
Aspergillus flavus	UV-vis, TEM, FTIR, XRD	TEM (8.92±1.61 nm)	NA	^Citation210
Fusarium semitectum	UV-vis, TEM, FTIR, XRD,	TEM (10–60 nm)	Spherical	^Citation211
Alternaria alternata	UV-vis, TEM, SEM, FTIR, EDX	SEM (20–60 nm, average 32.5 nm)	Spherical	^Citation212
Rhizopus stolonifer	UV-vis, TEM, SEM, FTIR, AFM	TEM (3 and 20 nm)	Spherical	^Citation213
Phanerochaete chrysosporium	UV-vis, TEM, FTIR, AFM, TLC	TEM (34–90 nm)	Spherical and oval	^Citation214

Abbreviations: NPs, nanoparticles; UV-vis, ultraviolet-visible (spectroscopy); TEM, transmission electron microscopy; SEM, scanning electron microscopy; EDX, energy-dispersive X-ray (spectroscopy); XRD, X-ray diffraction; FTIR, Fourier-transform infrared (spectroscopy); AFM, atomic force microscopy; TLC, thin-layer chromatography.

Table 6 Antibacterial activities of AgNPs

Biological entity	Testmicroorganism	Method	Reference
Citrullus colocynthis	Escherichia coli	Agar diffusion method	^Citation153
Pterocarpus santalinus	E. coli	NA	^Citation154
Madhuca longifolia flower extract	Bacillus cereus, Staphylococcus saprophyticus, E. coli, Salmonella typhimurium	Agar well diffusion method	^Citation220
Aspergillus clavatus fungus	E. coli, Pseudomonas aeruginosa	NA	^Citation221
Chenopodium murale leaf extract	E. coli	Cup–plate agar-diffusion method	^Citation222
Iresine herbstii leaf extract	Staphylococcus aureus, Enterococcus faecalis, E. coli	Agar-diffusion method	^Citation223
Beetroot	E. coli, P. aeruginosa, Staphylococcus, Streptococcus	NA	^Citation224
Dioscorea bulbifera plant	St. aureus, E. faecalis, E. coli	Diskc diffusion method	^Citation225
Rosa indica flower petals	E. coli, P. aeruginosa, Staphylococcus, Streptococcus	Agaer well diffusion method	^Citation226
Ocimum tenuiflorum plant	NA	Agar well diffusion method	^Citation227
Cassia fistula fruit extract	E. coli, Klebsiella pneumonia	Disk diffusion method
Chitosan polymer	S. aureus	Parallel-streak method, colony-counting method	^Citation114
Chitosan polymer	E. coli (ATCC 25922), S. aureus (ATCC 6538)	Agar disk diffusion method	^Citation228
Oxidized AgNPs	E. coli	Cup–plate agar-diffusion method	^Citation229
Gallic acid	E. coli	Microdilution method	^Citation230
AgNPs	E. coli, Vibrio cholerae, P. aeruginosa, Salmonella typhi	Agar diffusion method	^Citation73

Abbreviations: NPs, nanoparticles; NA, not available.

Table 7 Antifungal properties of AgNPs

Biological entity used for reduction	Fungal speciesused as test organism	Characterization	Reference
Green and black tea leaves	Aspergillus flavus, A. parasiticus	UV-vis, SEM, FTIR, EDX	^Citation231
Waste dried grass	Fusarium solani, Rhizoctonia solani	UV-vis, TEM, XRD	^Citation232
Dodonaea viscosaand Hyptis suoveolens leaf extracts	Candida albicans(ATCC 90028), C. glabrata(MTCC 3019), C. tropicalis(MTCC 184), clinical isolate (MTCC 11,802)	FTIR, SEM, XRD, DLS, ζ-potential	^Citation233
Cysteine and maltose	C. albicans(ATCC 10231), C. parapsilosis (ATCC 22019)	UV-vis, TEM, SEM, DLS	^Citation234
Lignin	A. niger	UV-vis, TEM, SEM, EDS, XRD	^Citation235
Cyanobacterium Nostoc strain HKAR2 cell extract	A. niger, Trichoderma harzianum	UV-vis, TEM, SAED, SEM, FTIR, XRD, ζ-potential	^Citation236
Bergenia ciliate plant extract	A. fumigatus (FCBP 66), F. solani(FCBP 0291), A. niger(FCBP 0198), A. flavus(FCBP 0064)	UV-vis, SEM, FTIR	^Citation237
Trifolium resupinatum seed extract	Neofusicoccum parvum, R. solani	UV-vis, TEM FTIR, XRD	^Citation238

Abbreviations: NPs, nanoparticles; UV-vis, ultraviolet-visible (spectroscopy); TEM, transmission electron microscopy; SEM, scanning electron microscopy; XRD, X-ray diffraction; FTIR, Fourier-transform infrared (spectroscopy); DLS, dynamic light scattering; EDX, energy-dispersive X-ray (spectroscopy); EDAX, ED X-ray analysis; SAED, selected-area electron diffraction.

Table 8 Anticancer property of AgNPs

Biological entity used for reduction	Cancer cells under study	Characterization	Reference
Cleome viscosa fruit extract	Lung (A549) and ovarian (PA1) cancer cell lines	UV-vis, TEM, SEM, FESEM, EDAX, FTIR, XRD	^Citation240
Annona muricata leaf extract	Human fibroblasts isolated from dermis	UV-vis, TEM, XRD, DLS, ζ-potential	^Citation239
N,N,N-trimethyl chitosan chloride and polyelectrolyte complex	Colon cancer cell lines (HCT116) and Mammalian cell lines (African green monkey kidney cell lines (VERO cells)	HRTEM, FESEM, FTIR, EDX, XRD, ^1H NMR	^Citation241
Rheum Rhabarbarum fresh stem extract	Cervical carcinoma HeLa cell line	UV-vis, SEM, TEM, FTIR, EDX, TGA, XRD, ζ- potential	^Citation242
Matricaria chamomilla	A549 lung cancer cells	UV-vis, TEM, FESEM, FTIR, XRD EDS, DLS	^Citation243
Zataria multiflora leaf extract	Cervical carcinoma cells (HeLa cell line)	UV-vis, TEM, FTIR, EDS, DLS, ζ- potential	^Citation96
Phoenix dactylifera hair-root extract	Human breast cancer (MCF7 cell line)	UV-vis, TEM, FTIR, XRD, FESEM, EDAX, Nanophox spectra analysis, PCCS	^Citation244

Abbreviations: NPs, nanoparticles; UV-vis, ultraviolet-visible (spectroscopy); TEM, transmission electron microscopy; SEM, scanning electron microscopy; FESEM, field-emission SEM; HRTEM, high-resolution TEM; XRD, X-ray diffraction; FTIR, Fourier-transform infrared (spectroscopy); AFM, atomic force microscopy; HPLC, high-performance liquid chromatography; DLS, dynamic light scattering; EDX, energy-dispersive X-ray (spectroscopy); EDAX, ED X-ray analysis; TGA, thermogravimetric analysis; PCCS, .

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