Hi wierd_dave,
http://www.xensor.nl/pdffiles/sheets/nanogas3939.pdf
the one I'm using is XI-395/390. So al the circuitry is directly doped on the silicon membrane. I was thinking to get one of the MAX-31856 IC to lock it in between thermopile and Due. But beforehand, was curious if the Due itself will read out some data directly.