Passivated silver nanoparticle coatings and methods of making the same
The instant disclosure is directed to passivated silver nanoparticle coatings and methods of making the same. A method may comprise obtaining a substrate having a surface, exposing the surface to a plurality of silver nanoparticles, applying a nucleating agent to the silver nanoparticles to form a plurality of silver cores, and passivating the silver cores by applying a sulfidation agent to the silver cores to form silver sulfide shells around the silver cores, thereby forming a coating comprising a plurality of sulfidated silver nanoparticles having a core-shell structure. The method may be used to form a coating comprising a plurality of sulfidated silver nanoparticles having a core-shell structure.
1 . A method comprising:
obtaining a substrate having a surface;
exposing the surface to a plurality of silver nanoparticles (Ag NPs);
applying a nucleating agent to the silver nanoparticles to form a plurality of silver cores; and
passivating the silver cores by applying a sulfidation agent to the silver cores to form silver sulfide (Ag 2 S) shells around the silver cores;
thereby forming a coating comprising a plurality of sulfidated silver nanoparticles (Ag/Ag 2 S) having a core-shell structure.
2 . The method of claim 1 , wherein the plurality of sulfidated silver nanoparticles are uniformly distributed on the surface.
3 . The method of claim 1 , wherein the substrate is selected from the group consisting of a water treatment instrument, a surgical instrument, an implantable medical device, a catheter, a bandage, a furniture article, a garment, and combinations thereof.
4 . The method of claim 1 , wherein the substrate comprises a material selected from the group consisting of a metal, a metal alloy, a polymer, a membrane, a textile, and combinations thereof.
5 . The method of claim 1 , wherein the substrate comprises stainless steel.
6 . The method of claim 1 , wherein the nucleating agent is selected from the group consisting of sodium borohydride, hydrazine, D-glucose, hyaluronic acid, and combinations thereof.
7 . The method of claim 1 , wherein the nucleating agent is D-glucose.
8 . The method of claim 1 , wherein the nucleating agent has a concentration from about 3 mM to about 300 mM.
9 . The method of claim 1 , wherein the sulfidation agent is selected from the group consisting of sodium sulfide, sodium thiosulfate, thiocarbamide, thioacetamide, and combinations thereof.
10 . The method of claim 1 , wherein the sulfidation agent is sodium sulfide.
11 . The method of claim 1 , wherein the sulfidation agent has a concentration from about 10 −1 M to about 10 −5 M.
12 . The method of claim 1 , wherein applying the sulfidation agent to the silver cores is done for a time period of from about 1 hour to about 12 hours.
13 . The method of claim 1 , wherein the silver cores have a diameter from about 10 nm to about 100 nm.
14 . A coating formed by the method of claim 1 .
15 . A composition comprising a plurality of sulfidated silver nanoparticles having a core-shell structure.
16 . A substrate having a surface coated with the composition of claim 15 .
17 . The substrate of claim 16 , wherein the plurality of sulfidated silver nanoparticles are uniformly distributed on the surface.
18 . The substrate of claim 16 , wherein the substrate is selected from the group consisting of a water treatment instrument, a surgical instrument, an implantable medical device, a catheter, a bandage, a furniture article, a garment, and combinations thereof.
19 . The substrate of claim 16 , wherein the substrate comprises a material selected from the group consisting of a metal, a metal alloy, a polymer, a membrane, a textile, and combinations thereof.
20 . The substrate of claim 16 , wherein the substrate comprises stainless steel.