# US 7,744,834 B2 · Method for manufacturing metal nanoparticles > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,744,834 B2 - Document ID: US7744834B2 - Status: Granted - Kind: B2 - Application number: 11/785,094 - Filed: 2007-04-13 - Published: 2008-02-21 - Granted: 2010-06-29 - Earliest claimed: 2006-07-10 - Assignees: Samsung Electro-Mechanics Co., Ltd. - Inventors: Kwi-Jong Lee; Jae-Woo Joung; Byung-Ho Jun - Web page: https://patentgrep.com/patent/US7744834B2 ## CPC - C22B 11/04: {by wet processes (extraction of metal compounds by leaching in organic solutions C22B3/16; treatment or purification of solutions by liquid-liquid extraction C22B3/26)} - B22F 1/054: Nanosized particles - B22F 9/24: starting from liquid metal compounds, e.g. solutions - B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites - C22B 3/22: by physical processes, e.g. by filtration, by magnetic means {, or by thermal decomposition} (treatment or purification of solutions by liquid-liquid extraction C22B3/26) - C22B 3/44: by chemical processes (treatment or purification of solutions by liquid-liquid extraction C22B3/26, by ion-exchange extraction C22B3/42) - Y02P 10/20: Recycling - C22B: PRODUCTION AND REFINING OF METALS (electrolytic C25); PRETREATMENT OF RAW MATERIALS - B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER - B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract A method for manufacturing metal nanoparticles, the method including forming a mixture by dissociating a metallic salt of a metal selected from the group consisting of Ag, Pd, Pt, Au and an alloy thereof as a metal precursor in fatty acid; and adding a metallic salt of a metal selected from the group consisting of Sn(NO3)2, Sn(CH3CO2)2, and Sn(acac)2 as a metallic catalyst into the mixture and mixing the mixture and the metallic salt. According to the method, metal nanoparticles have a uniform particle size distribution and a high yield by performing in a non-aqueous environment without using any organic solvent, and are environmentally friendly due to no use of a reducing agent. ## Claims ### Claim 1 A method for manufacturing metal nanoparticles, the method comprising: forming a mixture by dissociating a metallic salt of a metal selected from the group consisting of Ag, Pd, Pt, Au and an alloy thereof as a metal precursor in fatty acid; and adding a metallic salt of a metal selected from the group consisting of Sn(NO3)2, Sn(CH3CO2)2, and Sn(acac)2 as a metallic catalyst into the mixture and mixing the mixture and the metallic salt. ### Claim 2 (depends on 1) The method of claim 1, wherein the metal precursor is a silver salt selected from the group consisting of AgBF4, AgCF3SO3, AgNO3, AgClO4, Ag(CH3CO2), AgPF6 and Ag2O. ### Claim 3 (depends on 1) The method of claim 1, wherein the metal precursor is mixed in a molar ratio of 0.01 to 1 molar ratio with respect to the fatty acid. ### Claim 4 (depends on 1) The method of claim 1, wherein the fatty acid is at least one selected from the group consisting of saturated fatty acid, oleic acid, linoleic acid, linolenic acid and highly unsaturated acid. ### Claim 5 (depends on 1) The method of claim 1, wherein the forming the mixture further comprises heating mixture to a temperature range of 40 to 80° C. after dissociating the metal precursor in the fatty acid. ### Claim 6 (depends on 1) The method of claim 1, wherein the metallic catalyst is mixed in a molar ratio of 0.001 to 0.5 with respect to the metal precursor. ### Claim 7 (depends on 1) The method of claim 1, wherein the adding the metallic catalyst and the mixing comprises: adding the metallic catalyst while agitating the mixture; and heating the mixture to a temperature range of 80 to 150° C. ### Claim 8 (depends on 7) The method of claim 7, wherein the mixture is reacted for 0.5 to 4 hours at the temperature range. ### Claim 9 (depends on 1) The method of claim 1, wherein the method further comprises obtaining the metal nanoparticles. ### Claim 10 (depends on 9) The method of claim 9, wherein the obtaining the metal nanoparticles is performed by adding polar solvent into the mixture and by precipitating the nanoparticles. ### Claim 11 (depends on 10) The method of claim 10, wherein the polar solvent is selected from the group consisting of methanol, ethanol, propanol, acetone, ether and a mixture thereof. ### Claim 12 (depends on 10) The method of claim 10, wherein the obtaining the nanoparticles further comprises separating nanoparticles, which are precipitated, by centrifugal separator from the mixture. ### Claim 13 (depends on 1) The method of claim 1, wherein the mixture further comprises at least one organic solvent selected from the group consisting of toluene, xylene, chloroform, dichloromethane and alkane having carbon numbers of 6 to 18 such as hexane, tetradecane, etc. ### Claim 14 (depends on 1) The method of claim 1, wherein the mixture further comprises at least one reducing agent selected from the group consisting of NaBH4, LiBH4, KBH4, tetrabutylammonium borohydride, N2H4, PhHNNH2, glycol, glycerol, dimethylformamide, 1,2-pentanediol, and 1,2-hexanediol. ### Claim 15 (depends on 1) Metal nanoparticles manufactured by the method of claim 1. ### Claim 16 (depends on 15) The metal nanoparticles of claim 15, wherein the metal nanoparticles have a uniform size distribution, the size being between 1 and 10 nm. ### Claim 17 (depends on 15) Conductive ink comprising the metal nanoparticles of claim 15.