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Self-protected, Low-temperature Nanosolder

Sandia National Laboratories

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Publications:

PDF Document Publication
Market Sheet
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Technology Marketing Summary

Nanosolders allow for increased capabilities in the formation of soldered interconnections for heat sensitive electronic packages. The desired characteristic of nanosolder is to have a low process temperature that does not damage base materials or components, while also having a high service temperature that allows the product to operate in harsh environments. A team of Sandia researchers created a robust nanosolder that meets these very objectives, and is inexpensive and easy-to-use in an assembly process.

Description

Sandia’s nanosolder begins with a mixture of copper and silver nanoparticles in a toluene-based vehicle, that when heated to 150°C forms a 3-D epitaxial copper core and silver shell structure. The silver shell acts as a protective coating, creating a solder that remains stable when in contact with air until the melting step occurs to form the joint. This approach eliminates the need for specialized equipment to inert the environment. Unlike traditional lead-free solders, the finer structure of our nanosolder permits lower reflow processing temperatures, resulting in less thermal stress during processing. Sandia’s nanosolder can enable further miniaturization of electronics by enabling the development of a broader range of products without the risk of thermal damage to heat sensitive materials and components.

Benefits
  • Low processing temperatures – energy savings
  • Easy-to-use
  • Compatible with current soldering equipment
  • Reduces thermal stresses on heat sensitive materials and assemblies during processing
Applications and Industries
  • Micro-electrical mechanical systems (MEMS)
  • Joining of carbon nanotube and additive manufactured materials and parts
  • Assembly of complex sensors and opto-electronic products
Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Date
Patent 9,463,532
Patent
9,463,532
Low-temperature nanosolders
A nanosolder comprises a first metal nanoparticle core coated with a second metal shell, wherein the first metal has a higher surface energy and smaller atomic size than the second metal. For example, a bimetallic nanosolder can comprise a protective Ag shell "glued" around a reactive Cu nanoparticle. As an example, a 3-D epitaxial Cu-core and Ag-shell structure was generated from a mixture of copper and silver nanoparticles in toluene at temperatures as low as 150.degree. C.
Sandia National Laboratories 10/11/2016
Issued
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
SD#12758Prototype - Sandia estimates this technology at a Technology Readiness Level 4. Basic technological components are integrated to establish that the pieces will work together.Available01/31/201701/31/2017

Contact SNL About This Technology

To: <ip@sandia.gov>