Chemical reduction is the most common method for synthesizing metal nanoparticles. This method involves reducing a metal salt precursor to form metal atoms, which then self-assemble into nanoparticles. The reducing agent can be a chemical such as sodium borohydride or a physical process such as heating.

Physical vapor deposition is another common method for synthesizing metal nanoparticles. This method involves vaporizing a metal and then condensing the vapor onto a substrate. The size and shape of the nanoparticles can be controlled by the deposition conditions, such as the temperature and pressure.

Sono synthesis is a method of nanoparticle synthesis that uses ultrasound waves. The ultrasound waves create cavitation bubbles in the solution, which collapse and generate high temperatures and pressures. These conditions can cause metal atoms to be ejected from the solution and form nanoparticles.

Laser ablation is a method of nanoparticle synthesis that uses a high-powered laser to vaporize a metal target. The vaporized metal atoms then condense into nanoparticles.

Polymeric micelles are a method of nanoparticle synthesis that uses block copolymers. These copolymers have two different types of blocks, one that is hydrophilic (water-loving) and one that is hydrophobic (water-hating). When the copolymers are dissolved in water, they self-assemble into micelles, which are spherical structures with a hydrophilic core and a hydrophobic shell. The hydrophobic core can then be used to encapsulate metal atoms or ions, which can be reduced to form nanoparticles.