I frequently use thermally conductive epoxies at work to attach temperature sensors, these are relatively inexpensive so re-use isn't an issue and its important that they don't fall out and often clamping isn't practical. I also often use thermally conductive glue to attach thermoelectric (peltier) modules where clamping is difficult.
Here is the article in Advanced Materials and processes:
and here is the article in Scientific Reports
Looks like they use metallic nanoparticles grown on the surface that alloy with different metallic nanoparticles on the opposite surface to stick together.
Sounds interesting but I'd be very curious what the resistance and how consistently it can be applied(in order to limit variation for impedance matched traces).
Rewrite of http://www.eurekalert.org/pub_releases/2016-01/nu-rmg010816....