Method for aligning carbon nanotubes containing magnetic nanoparticles in a thermosetting polymer using a magnetic field

摘要

The chip stack of semiconductor chips with enhanced cooling apparatus includes a first chip with circuitry on a first side and a second chip electrically and mechanically coupled to the first chip by a grid of connectors. The chip stack further includes a thermal interface material pad between the first chip and the second chip. The thermal interface material pad comprises a plurality of nanotubes containing a magnetic material, aligned parallel to mating surfaces of the first chip and the second chip, wherein a hydrophobic tail of oleic acid is wrapped around each one of the plurality of nanotubes and a hydrophilic acid head of the oleic acid is attached to the magnetic material.

主权项

1. A method for aligning a plurality of nanotubes containing a magnetic material in a thermal interface material to enhance performance of the thermal interface material, comprising:
attaching the magnetic material to the plurality of nanotubes, wherein the attaching further comprises:
dispersing the plurality of nanotubes into a first solution containing oleic acid, wherein a hydrophobic tail of the oleic acid wraps around one of the plurality of nanotubes; anddispersing the magnetic material into a second solution containing oleic acid, wherein a hydrophilic acid head of the oleic acid attaches to the magnetic material; dispersing the plurality of nanotubes containing the magnetic material into the thermal interface material; heating the thermal interface material until the at least one thermosetting polymer un-crosslinks; and applying a magnetic field of sufficient intensity to align the plurality of nanotubes containing the magnetic material in the thermal interface material; and cooling the thermal interface material until the at least one thermosetting polymer re-crosslinks.