Are the robots we create alive?
I was taught in school organic substances were those composed mostly of carbon, hydrogen and oxygen.
The machines being on their own and still surviving is a sign of negative entropy.
Using sentience as criterion is problematic because it can't be tested. But I had to bring it here because the discussion was already heading towards philosophy.
Negentropy, on the other side, is a much more concrete criterion, and the broadest definition of life I know of. We could stick to the classic cell criterion, but then it would be too easy to answer the question which started the whole discussion with a no.