الفهرس | Only 14 pages are availabe for public view |
Abstract New non-toxic pure lanthanide based nanomaterials and transition metal nanocomplexes as well as dispersed into silica matrix were prepared for latent fingerprint detection and biomedical applications, respectively. The prepared nanomaterials were characterized using several advanced techniques. The lanthanide based materials consist of pure x mol% Eu3+/Y2Ti2O7 and dispersed into silica matrix, where x = 1, 2, 4, 6, 10, 15 and 30. The pure Eu3+/Y2Ti2O7 and dispersed into silica materials have nanocrystalline structures with spherical shapes. The pure Eu3+/Y2Ti2O7 with different doping concentrations was characterized with faint orange red emission colour. Otherwise, Eu3+/Y2Ti2O7 dispersed into silica matrix powders give an intense pure red emission. The photoluminescence (PL) lifetime measurements showed that the Eu3+/Y2Ti2O7 dispersed into silica matrix was characterized with constant and high PL lifetime even at high doping concentrations in comparison with the pure samples. Judd–Ofelt calculations confirmed the experimental results. The obtained pure and dispersed into silica samples have very low toxicity. The prepared nanophosphor dispersed into silica matrix was successfully developing the latent fingerprint from various forensic relevant materials, including non-porous, semi-porous and porous surfaces. Also, chromone Schiff base complexes of Cu(II), Ni(II), Co(II), Fe(III), Zn(II), Cd(II) and UO2(VI) as well as Zn(II) complex-silica xerogel nanohybrid were successfully prepared in nano domain with crystalline or amorphous structures. The spectroscopic data revealed that the Schiff base ligand behaves as a monobasic tridentate ligand. The coordination sites with the metal ions are the γ-pyrone oxygen, azomethine nitrogen and oxygen of the carboxylic group. The metal complexes exhibited octahedral geometry except Cu(II) complex which has a square planar geometry and UO2 complex in which uranium ion is hepta-coordinated. Transmission electron microscope (TEM) analysis showed that Ni(II) and Zn(II) complexes have aggregated spheres and rod morphologies, respectively. TEM images of Zn(II) complex-silica xerogel nanohybrid showed a nanosheet morphology with 46 nm average size and confirmed that the complex was uniformly distributed into the silica pores. The obtained nanocomplexes were tested as antimicrobial and antitumor agents. The results showed that Zn(II) nanocomplex and Zn(II) complex-silica xerogel nanohybrid have high activity. The toxicity test on mice showed that Zn(II) complex and Zn(II) complex-silica xerogel nanohybrid have lower toxicity than cisplatin. Finally, the obtained results showed that the prepared nanomaterials have great potential applications in the fields of forensic and medical sciences. |