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High IR absorbing coating for a crystal

I'm looking for a high absorbing coating (in the far IR region,i.e. 8-14 micron (700-1200 cm-1))that has to be applied on a crystal. It doesn't have to resist to high temperatures but it has to have low thermal conductivity. What I need is to measure the temperature of the crystal with an infrared thermocamera (the crystal is transparent in the IR region). Aluminium oxide (PVD tecnnique)would work, but I can't find absorbing information and so I can't calculate the thickness of the coating (it should be few micron, so the conductivity still remains low).

Thanks to everyone.

Giacomo Tambascia
university student - Modena, Italy
2003

Try Gold Black. These are used as the absorbing surfaces on many types of IR detectors.

Alan Doctor
- NY, New York
2005