Table 2.

Metal nanoparticles obtained using NDESs with a description of the method of obtaining NDESs and the functions it performs in the system.

Material	Natural Deep Eutectic Solvents	Process Parameters of NDES Synthesis	Size of Nanoparticles	NDES Function	Ref.
Au	Choline chloride–urea (1:2)	Conventional heating in 100 °C	300 nm	Reaction medium, stabiliser	[7]
Au	Choline chloride–urea (1:2)	Conventional heating in 80 °C	5 nm	Growth media	[74]
Au	Choline chloride–urea (1:2) Choline chloride–ethylene glycol (1:2)	Conventional heating in 80 °C	17.74–23.54 nm	Reaction medium, stabiliser	[75]
Au	Choline chloride–gallic acid–glycerol (1:0.25:0.25)	Conventional heating in 100 °C	30–100 nm	Reaction medium, stabiliser, reducer	[76]
Au	trimethylglycine–glycolic acid Trimethylglycine–phenylacetic acid, trimethylglycine–glycerol	Conventional heating in 90 °C	4–7 nm	Reaction medium, stabiliser	[71]
Ag	Choline chloride–ethylene glycol (1:2)	Conventional heating in 50 °C	Ag coatings 35 nm thick	Material used to disperse the silver layer on the nickel substrate	[72]
Au	Choline chloride–urea (1:2)	Conventional heating in 100 °C	35.1–46.7 nm	Reaction medium	[77]
Ag	Choline nitrate–glycerol (1:2) Choline chloride–glycerol (1:2) Choline acetate–glycerol (1:2)	Conventional heating in 60–70 °C	7.6–11.5 nm	Reaction medium	[73]
Ag	Silver triflate–acetamide (1:4)	Conventional heating in 70 °C	9–16 nm	Reaction media, source of silver nanoparticles	[78]
Pt	Choline chloride–urea (1:2)	Conventional heating in 80 °C	Approx. 200 nm	Reaction medium, growth media	[79]