Re: What do you do with it afterward?
" There are a great many "molybdenum oxides" to choose from though,"
True. And they also had a tendency to be volatile (a little problem that has limited it's otherwise excellent use for thinks like spaceplane heat shields. They don't forma protective layer like that on Alumium. They vaporise).
"might explain the obseved improvements in electron mobility, as the complex moly oxides can act as both an electron donor and an acceptor."
Which raises the question what does it do for hole transport? Relevant if you want to do CMOS.
"Also any dust with just the right "nano" size is harmful to the lungs; whether the particles are inert or not."
True but I think you'll find this is actually well below the active size, which IIRC is around the 50-70 micrometre size, rather than nanometre size.
My instinct is that the Mercury dumped from all those "eco friendly" light bulbs into the environment across Europe will be a much bigger health hazard.