| Summary: | 碩士 === 中原大學 === 化學研究所 === 99 === Aluminosilicate and gallosilicate mesoporous molecular sieves were prepared using hydrothermal technique. These nano-scale mesoporous materials were characterized by X-Ray diffraction (XRD), N2 adsorption/ desorption, and scanning electron microscope (SEM). The results gave high surface and pore volume of 600∼800m2/g and 1.0∼2.5 m3/g, respectively, while narrow pore distribution and nanoparticle size between 40 and 60nm were obtained.
Most of Ga and Al is 4-coordinated incorporated into the framework of the mesoporous silica nanoparticle(MSN) was revealed in 27Ga MAS NMR and 27Al MAS NMR spectra, respectively. Photoluminescence (PL) and time-resolved photoluminescence were used to investigate the optical studies of nano-scaled aluminosilicate mesoporous particles (MAN) and nano-scaled gallosilicate mesoporous particles (MGN). The PL spectra showed that the PL intensity is proportionally correlated with the amount of gallium and aluminum, increase amount of gallium/ aluminium gave higher intensity with PL peak. Also, blue-green PL intensity of aluminosilicate and gallosilicate were observed to be about 100 times than MSN alone. This can be explained by the incorporation of Ga into the framework that makes the structure distortion and the gallosilicate bond strain which greatly enhanced the generation of E’ centers. The two E’ defect centers, each consisting of one silicon atom and three oxygen atoms, can be joined together to form neutral oxygen-vacancy defects (NOV). The strength of blue-green PL is attributed to NOV. Therefore, strong PL is attributed to MGN having the NOV instead of Ga2O3 as observed in PL, XRD and TRPL. With the results provided, MGN and MAN can be a potential use as cellular labeling for fluorescence microscopy.
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