"in doubt of" is correct and usable in written English.
You can use it to express uncertainty about something. For example, "He was in doubt of the result of the election."
If in doubt of eligibility, you may petition to be considered to still pursue a thesis.
I was never in doubt of my own good will and elevated consciousness.
"She's a Group One winner and the forecast was for rain, the other filly was in doubt of running".
You're never in doubt of his prowess, of his ardor as an executant, of his animal grace, of his marvelous naturalness.
If you were ever in doubt of the difficulty of a 9G centrifuge test, this video should be all the evidence you need.
Those in doubt of their good vibrations need only peruse the titles: "Dub Side of the Moon," "Radiodread," "Easy Star's Lonely Hearts Dub Band".
But its future is in doubt because of a pending government review of the scheme.
Rejecting the bill puts in doubt millions of dollars in aid.
Mr. Olmert's political future is in doubt because of corruption allegations at home.
However, that ceremony is in doubt because of the outcry over the centre.
He is the author of "In Doubt: The Psychology of the Criminal Justice Process Harvard University Pressss).
