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http://dx.doi.org/10.5762/KAIS.2019.20.5.1

A Study on the Blue Fluorescence Characteristics of Silica Nanoparticles with Different Particle Size  

Yoon, Ji-Hui (Department of Advanced Chemical Engineering, Mokwon University)
Kim, Ki-Chul (Department of Advanced Chemical Engineering, Mokwon University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.20, no.5, 2019 , pp. 1-6 More about this Journal
Abstract
Organic dye-doped silica nanoparticles are used as a promising nanomaterials for bio-labeling, bio-imaging and bio-sensing. Fluorescent silica nanoparticles(NPs) have been synthesized by the modified $St{\ddot{o}}ber$ method. In this study, dye-free fluorescent silica NPs of various sized were synthesized by Sol-Gel process as the modified $St{\ddot{o}}ber$ method. The functional material of APTES((3-aminopropyl)triethoxysilane) was added as an additive during the Sol-Gel process. The as-synthesized silica NPs were calcined at $400^{\circ}C$ for 2 hours. The surface morphology and particle size of the as-synthesized silica NPs were characterized by field-emission scanning electron microscopy. The fluorescent characteristics of the as-synthesized silica NPs was confirmed by UV lamp irradiation of 365 nm wavelength. The photoluminescence (PL) of the as-synthesized silica NPs with different size was analyzed by fluorometry. As the results, the as-synthesized silica NPs exhibits same blue fluorescent characteristics for different NPs size. Especially, as increased of the silica NPs size, the intensity of PL was decreased. The blue fluorescence of dye-free silica NPs was attributed to linkage of $NH_2$ groups of the APTES layer and oxygen-related defects in the silica matrix skeleton.
Keywords
Blue Fluorescent; Organic Dye; Silica Nanoparticle; Sol-Gel Process; $St{\ddot{o}}ber$ Method;
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