HI, At 9 weeks, your pup has only just left his playmates, and this was how he used to behaving with his brothers and sisters, he will adjust. When Jazz was 12 weeks old I started giving her some chews, rawhide, white rolled up newspaper size. i would play with her, and when she started biting say a firm NO, get up and walk away. I would then come back and after about 10 mins give her chew and let her chew it for about 30 moins, or an hour whilst i was in the room with her. Then I would distract her with some toys ,and take the chew away. I would suggest you do this at least an hour before bedtime, so she has time to relive herself properly, as i understand these chews make them go to the toliet more often.
The ignoring really does work, it is frustrating, but it DOES work!!!..
Does she have her own crate/secure space? Now Jazz has her chew every other night for about an hour, and trotts off to her cage for some time to herself. Its bliss.... , but i do find myself creeping outside the room to check and see if shes ok. She makes such a racket while she eats her chew, its almost orgasmic..