Gas-assisted low temperature bonding of polymeric micro/nanostructures

Yong Yang*, L. James Lee

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review


Polymer-based biomedical micro/nanodevices containing environmentally sensitive biomolecules are attracting increased interest. A critical requirement is the ability to assemble these devices at low temperatures in order to minimize denaturization. Studies of polymer thin films revealed that the properties at the polymer surface differed from those in the bulk. It was found that glass transition temperatures (T g) at the polymer-air surface was substantially lower than the bulk T g and increased toward the bulk value with depth from the surface. Subcritical CO 2 could enhance the chain mobility and greatly depress T g near the surface. Benefiting from this, we successfully demonstrated low temperature bonding of polymeric micro/nanostructures. The original micro/nanostructures are perfectly preserved after bonding.

Original languageEnglish
Number of pages4
StatePublished - 2005
EventSociety of Plastics Engineers Annual Technical Conference 2005, ANTEC 2005 - Boston, MA, United States
Duration: 1 May 20055 May 2005


ConferenceSociety of Plastics Engineers Annual Technical Conference 2005, ANTEC 2005
Country/TerritoryUnited States
CityBoston, MA


  • Carbon dioxide
  • Diffusion
  • Neutron reflectivity
  • Polymer surface dynamics
  • Polystyrene


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