Çekirdek/Kabuk Yapısına Sahip Silika Jel İçerisine Piren İçeren Amfifilik Polimerlerin Enkapsülasyonu ve Sensör Uygulamaları
Özet
In recent years, there has been great interest in the development of fast and reliable
chemical sensors to detect trace amounts of hazardous chemicals. These sensors have
potential applications in environmental cleanup and homeland security. Polynitro
aromatic compounds (NACs) such as picric acid (PA), 2,4,6-trinitrotoluene (TNT) and
its degradation product dinitrotoluene (DNT) are widely used as key components in many
known explosives. Among the various known detection methods, fluorescence
techniques have recently gained special interest. Pyrene and its derivatives are widely
used in fluorescence-based sensor systems due to their fluorescent properties and high
stability.
In this thesis, a new explosive detection sensor system was developed by encapsulating
amphiphilic polymers containing pyrene into mesoporous silica gels with a core/shell structure consisting of a hydrophilic core and a hydrophobic outer shell by pore size
reduction. The SiO2 core synthesized by the Stöber method was coated with hydrophobic
BTME (1,2(bistrimethoxysilyl)ethane), an organosilane derivative, in the presence of
pyrene-containing amphiphilic polymers and small organic molecules (resorcinol, etc.)
were used as templates to create an interphase gap during coating. The bilayer structure
was then etched with ammonia solution to shrink the core, which increases the phase gap
between the core and the shell. In this way, the high surface area and fast adsorption
properties provided by the interphase and pore size allowed this structure to be used as a
sensor for the detection of nitroaromatic compounds. The obtained material with pyrene containing core/shell structure was characterized by TEM, BET, TGA, DLS methods.
The photophysical properties of the related compound were determined by UV-VIS and
Fluorescence spectroscopy.
