| Texto completo | |
| Autor(es): |
Gul, Iram
;
Khan, Zahid U.
;
Galani, Sammra
;
Huda, Subul
;
Khan, Latif U.
;
Juwhari, Hassan K.
;
Hyder, Ali
;
Brito, Hermi F.
;
Zaheer, Muhammad
;
Khan, Muhammad Abdullah
Número total de Autores: 10
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ACS APPLIED OPTICAL MATERIALS; v. N/A, p. 11-pg., 2025-08-19. |
| Resumo | |
Luminescent semiconductor nanocrystals (NCs) with strong visible emission are highly desirable for the sensitive detection of heavy metal ions at trace levels. Herein, the study focuses on enhanceing Mn2+ ion emission achieved by incorporating trivalent lanthenide (Ln3+) ions, i.e., Sm3+ and Gd3+ ions, at the Zn sites in a ZnSe lattice. This enhancement was confirmed by integrated photoluminescence (PL) and X-ray emission optical luminescence (XEOL), supported by quantitative X-ray absorption fine structure (XAFS) analyses. The observed increase in the visible emission was attributed to efficient energy transfer from Sm3+/Gd3+ to Mn2+ centers in ZnSe NCs. The luminescent NCs are subsequently employed as nanosensors for detecting Pb2+ and Hg2+ ions, exhibiting marked quenching upon exposure. The calculated limits of detection (LoDs) for Pb2+ (2.51 mu M) and Hg2+ (6.63 mu M) demonstrate greater sensitivity toward Pb2+ as compared to Hg2+. The system is selective across a range of interfering ions (i.e., Ag1+, Co2+, Ni2+, Cd2+, Gd3+, Tm3+, Yb3+, and Er3+) having different oxidation states when present concurrently. Furthermore, lifetime decay measurements, combined with Stern-Volmer analysis, indicate that quenching likely occurs through both static and dynamic mechanisms. These results highlight the potential of colloidal ZnSe:Mn2+,Sm3+ NCs as effective platforms for the sensitive and selective detection of toxic metal ions and have the potential to be employed for environmental monitoring applications. (AU) | |
| Processo FAPESP: | 21/00356-6 - Quantum dots com fluorescência multifuncional como amplificadores para a geração 1O2 e terapia fotodinâmica aprimorada sinérgica |
| Beneficiário: | Zahid Ullah Khan |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 21/08111-2 - Materiais conversores de luz à base de terras raras: marcadores luminescentes, sensores e amplificadores ópticos |
| Beneficiário: | Hermi Felinto de Brito |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |