Trained search dogs use a scent article provided by the subject’s family. Generally a pillowcase or a recently worn shirt. Applying a “scent” to your boots will mask the scent they’re looking for. Good way to not get found except by your own dog, who may be by your side and thus useless for the purpose.
If you’re going to train your dog to find family members, use the normal scent articles. Better yet, join a canine SAR team and get them trained for real.