tikzDevice and sans serif

Aloha all,

I haven't been able to find how to choose the font used by tikzDevice.
My first tries have all been set with a serif font and I'd like to have
them use the sans serif font instead.  I've looked through the
documentation and googled a bit without success.  Is this possible? Can
someone point me to instructions?

All the best,
Tom

Thomas S. Dye
http://www.tsdye.com