What materials are used in non thermal plasma? While reading about non-thermal plasmas, I came across their ionization potentials(~1%), and other capabilities, such as their non Maxwellian energy distributions. At what temperatures, and pressures do they exhibit such properties, and what materials are used to create non thermal plasma?  
 A: 
At what temperatures, and pressures do they exhibit such properties

First, temperature is only rigorously defined when the particle distribution functions are Maxwellian.  For a non-thermal plasma, the notion of a "temperature" is ill-defined.  If you do see someone talking about temperature for such a case, they've likely ignored a small perturbation that makes the distribution non-Maxwellian.

and what materials are used to create non thermal plasma?

Materials have little to do with this.  By this I mean that the species of gas you pick to ionize, for instance, does not by itself determine whether your plasma will be non-thermal.  It has more to do with the ionization process, confinement and / or heating scheme that you're using.  
For example, I can launch electromagnetic waves into a plasma that damp on electrons in a certain way (see Landau Damping) such that energy is preferentially transferred to some electrons in the tail of the (originally) Maxwellian distribution.  If I do this continuously, it will change the steady-state distribution function away from a Maxwellian.
A: Temperature is defined by thermodynamic equilibrium, which should be clarified at first. From this definition, we can easily obtain that the so called "non thermal plasma" is a concept which describes a plasma state without thermodynamic equilibrium. Basically speaking, thermodynamic equilibrium is obtained by collisions between particles caused by molecular force in neutral gas. On the other hand, coulomb force takes place of molecular force in highly ionized plasma. Note that these two forces are both working in plasma. So, particle density, initial velocity distribution and ionization rate will dominate in determining whether an isolated plasma system could get a thermodynamic equilibrium or not. 
