Nano-sized silver particle ink, nano-sized silver particle sintered body, and method for producing nano-sized silver particle ink

Abstract

Provided are a fine silver particle ink composed of hexylamine, dodecylamine, oleic acid, fine silver particles and a solvent, in which the volume resistivity of a sintered body at 100° C. obtained after the ink is applied on a substrate by spin coating is 8 to 25 μΩ cm, a sintered body thereof, and a method for producing a fine silver particle ink. When a fine silver particle ink containing coated fine silver particles is produced by a silver-amine complex decomposition method, production can be carried out smoothly. The fine silver particle ink can be sintered even at a low temperature, and a sintered body thereof has a mirror surface and low volume resistance.

We claim: 
     
         1 . A nano-sized silver particle ink formed by dispersing silver particles in a solvent,
 wherein the silver particle use a silver oxalate that has been wetted by 30 to 200 wt % of a solvent, as a silver raw material, a solvent was added to the silver particles and dissolved the silver particles such that the silver concentration after mixing was 20 to 50 wt %, when the nano-sized silver particle ink is analyzed by a gas chromatography system having a FID capillary column and the molar ration of hexylamine with respect to dodecylamine finally included in the silver particle ink is 3:1 to 60:1, and the amount of oleic acid included in the silver particle ink is 0.02 to 0.30 mmol/g relative to the weight of silver and when a silver film formed by applying the ink on a substrate by spin coating is dried for 5 minutes at room temperature and then sintered at 100° C., a sintered body has a volume resistance of 8 to 25 μΩ·cm.   
     
     
         2 . The nano-sized silver particle ink according to  claim 1 , wherein the solvent is composed of a mixed liquid of two or more kinds selected from any kind of alkane and any kind of alcohol, and mixing volume ratio is 2:1 to 4:1. 
     
     
         3 . The nano-sized silver particle ink according to  claim 1 , wherein the average diameter of the silver particle included in the ink is 10 nm to 15nm. 
     
     
         4 . The nano-sized silver particle ink according to  claim 1 , wherein when the ink is stored at normal temperature and normal pressure, silver precipitation is visually not recognized after the passage of one month from production. 
     
     
         5 . The nano-sized silver particle ink according to  claim 2 , wherein when the ink is stored at normal temperature and normal pressure, silver precipitation is visually not recognized after the passage of one month from production. 
     
     
         6 . The nano-sized silver particle ink according to  claim 3 , wherein when the ink is stored at normal temperature and normal pressure, silver precipitation is visually not recognized after the passage of one month from production. 
     
     
         7 . The nano-sized silver particle ink according to  claim 1 , wherein when a silver film formed by applying the ink on a substrate is dried for 5 minutes at room temperature and then sintered at 100° C., the silver film has a volume resistance of 12 μΩ·cm or less. 
     
     
         8 . The nano-sized silver particle ink according to  claim 2 , wherein when a silver film formed by applying the ink on a substrate is dried for 5 minutes at room temperature and then sintered at 100° C., the silver film has a volume resistance of 12 μΩ·cm or less. 
     
     
         9 . The nano-sized silver particle ink according to  claim 3 , wherein when a silver film formed by applying the ink on a substrate is dried for 5 minutes at room temperature and then sintered at 100° C., the silver film has a volume resistance of 12 μΩ·cm or less. 
     
     
         10 . The nano-sized silver particle ink according to  claim 4 , wherein when a silver film formed by applying the ink on a substrate is dried for 5 minutes at room temperature and then sintered at 100° C., the silver film has a volume resistance of 12 μΩ·cm or less. 
     
     
         11 . The nano-sized silver particle ink according to  claim 1 , wherein when a silver film formed by applying the ink on a substrate is dried for 5 minutes at room temperature and then sintered at 100° C., the silver particle sintered body having a mirror surface. 
     
     
         12 . The nano-sized silver particle ink according to  claim 2 , wherein when a silver film formed by applying the ink on a substrate is dried for 5 minutes at room temperature and then sintered at 100° C., the silver particle sintered body having a mirror surface. 
     
     
         13 . The nano-sized silver particle ink according to  claim 3 , wherein when a silver film formed by applying the ink on a substrate is dried for 5 minutes at room temperature and then sintered at 100° C., the silver particle sintered body having a mirror surface. 
     
     
         14 . The nano-sized silver particle ink according to  claim 4 , wherein when a silver film formed by applying the ink on a substrate is dried for 5 minutes at room temperature and then sintered at 100° C., the silver particle sintered body having a mirror surface. 
     
     
         15 . The nano-sized silver particle ink according to  claim 7 , wherein when a silver film formed by applying the ink on a substrate is dried for 5 minutes at room temperature and then sintered at 100° C., the silver particle sintered body having a mirror surface. 
     
     
         16 . A nano-sized silver particle sintered body, formed by applying the fine silver particle ink according to  claim 1  and then sintering the ink at 100° C., the silver particle sintered body having a mirror surface. 
     
     
         17 . A nano-sized silver particle sintered body, formed by applying the fine silver particle ink according to  claim 2  and then sintering the ink at 100° C., the silver particle sintered body having a mirror surface. 
     
     
         18 . A nano-sized silver particle sintered body, formed by applying the fine silver particle ink according to  claim 3  and then sintering the ink at 100° C., the silver particle sintered body having a mirror surface. 
     
     
         19 . A nano-sized silver particle sintered body, formed by applying the fine silver particle ink according to  claim 4  and then sintering the ink at 100° C., the silver particle sintered body having a mirror surface. 
     
     
         20 . A nano-sized silver particle sintered body, formed by applying the fine silver particle ink according to  claim 7  and then sintering the ink at 100° C., the silver particle sintered body having a mirror surface.