Colloidal Plasmonic Titanium Nitride Nanoparticles: Properties and   Applications
  Optical properties of colloidal plasmonic titanium nitride nanoparticles are examined with an eye on their photothermal via transmission electron microscopy and optical transmittance measurements. Single crystal titanium nitride cubic nanoparticles with an average size of 50 nm exhibit plasmon resonance in the biological transparency window. With dimensions optimized for efficient cellular uptake, the nanoparticles demonstrate a high photothermal conversion efficiency. A self-passivating native oxide at the surface of the nanoparticles provides an additional degree of freedom for surface functionalization. 
Urcan Guler, Sergey Suslov, Alexander V. Kildishev, Alexandra   Boltasseva, and Vladimir M. Shalaev
physics.optics cond-mat.mes-hall cond-mat.mtrl-sci