December 2014 | S. Iravani, H. Korbekandi, S.V. Mirmohammadi, B. Zolfaghari
Silver nanoparticles (NPs) have attracted significant attention due to their unique properties, including optical, antimicrobial, and electrical characteristics. Various methods have been developed for their synthesis, including physical, chemical, and biological approaches. This review summarizes the current state and future prospects of these methods, highlighting their potentials and limitations for industrial applications.
Physical methods such as evaporation-condensation and laser ablation are effective for producing silver NPs with uniform size and distribution. However, these methods can be energy-intensive and require specialized equipment. Laser ablation in solution is a promising technique, producing silver NPs with controlled size and morphology. The arc discharge method can also be used to synthesize silver NPs in deionized water without surfactants.
Chemical methods involve the reduction of silver ions using various reducing agents such as sodium citrate, ascorbate, and polyol. These methods are widely used for producing stable silver NPs with controlled size and shape. The polyol process is particularly effective for producing monodisperse silver NPs. Additionally, microemulsion techniques allow for the synthesis of uniform and size-controlled silver NPs by utilizing the interface between two immiscible phases.
Biological methods, including the use of bacteria, fungi, and plants, offer eco-friendly and cost-effective alternatives for silver NP synthesis. These methods utilize natural reducing agents and stabilizers, resulting in highly stable and well-characterized NPs. For example, bacteria such as Bacillus licheniformis and Pseudomonas stutzeri AG259 can reduce silver ions to form NPs with various sizes and shapes. Fungi like Fusarium oxysporum can also be used for extracellular synthesis of stable silver NPs.
Green synthesis methods, such as the use of polysaccharides and surfactants, are gaining popularity due to their environmental benefits. These methods avoid the use of toxic chemicals and produce NPs with high stability and dispersibility. Additionally, microwave-assisted synthesis is a promising technique that offers faster reaction times, reduced energy consumption, and better product yields.
Overall, the synthesis of silver NPs through various methods continues to evolve, with a focus on developing eco-friendly, cost-effective, and scalable techniques for industrial applications. The choice of method depends on factors such as the desired size, shape, and stability of the NPs, as well as the specific application requirements.Silver nanoparticles (NPs) have attracted significant attention due to their unique properties, including optical, antimicrobial, and electrical characteristics. Various methods have been developed for their synthesis, including physical, chemical, and biological approaches. This review summarizes the current state and future prospects of these methods, highlighting their potentials and limitations for industrial applications.
Physical methods such as evaporation-condensation and laser ablation are effective for producing silver NPs with uniform size and distribution. However, these methods can be energy-intensive and require specialized equipment. Laser ablation in solution is a promising technique, producing silver NPs with controlled size and morphology. The arc discharge method can also be used to synthesize silver NPs in deionized water without surfactants.
Chemical methods involve the reduction of silver ions using various reducing agents such as sodium citrate, ascorbate, and polyol. These methods are widely used for producing stable silver NPs with controlled size and shape. The polyol process is particularly effective for producing monodisperse silver NPs. Additionally, microemulsion techniques allow for the synthesis of uniform and size-controlled silver NPs by utilizing the interface between two immiscible phases.
Biological methods, including the use of bacteria, fungi, and plants, offer eco-friendly and cost-effective alternatives for silver NP synthesis. These methods utilize natural reducing agents and stabilizers, resulting in highly stable and well-characterized NPs. For example, bacteria such as Bacillus licheniformis and Pseudomonas stutzeri AG259 can reduce silver ions to form NPs with various sizes and shapes. Fungi like Fusarium oxysporum can also be used for extracellular synthesis of stable silver NPs.
Green synthesis methods, such as the use of polysaccharides and surfactants, are gaining popularity due to their environmental benefits. These methods avoid the use of toxic chemicals and produce NPs with high stability and dispersibility. Additionally, microwave-assisted synthesis is a promising technique that offers faster reaction times, reduced energy consumption, and better product yields.
Overall, the synthesis of silver NPs through various methods continues to evolve, with a focus on developing eco-friendly, cost-effective, and scalable techniques for industrial applications. The choice of method depends on factors such as the desired size, shape, and stability of the NPs, as well as the specific application requirements.