Highly selective optical sensor N/S-doped carbon quantum dots (CQDs) for the assessment of human chorionic gonadotropin $\beta$-hCG in the serum of breast and prostate cancer patients

AlZahrani, Yasmeen M; Alharthi, Salha; AlGhamdi, Hind A; Youssef, AO; Ahmed, Shahenda S; Mohamed, Ekram H; Mahmoud, Safwat A; Moustafa, Mohamed said attia;