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Preparation and Luminiscence Oxygen Sensing Properties of Hybrid Materials Based on a Covalently Grafted Iridium(Ⅲ) Complex

Author: XingYaJie
Tutor: LiBin
School: Northeast Normal University
Course: Inorganic Chemistry
Keywords: Oxygen sensing Mesoporous materials Iridium Complexes Covalent grafting
CLC: O641.4
Type: Master's thesis
Year: 2009
Downloads: 62
Quote: 2
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Abstract


Oxygen is an important condition of human survival , the determination of the concentration of oxygen molecule has a very important significance for the analysis of the field of chemistry, biochemistry , medical diagnostics , environmental monitoring and research . Intrinsically safe fiber optic oxygen sensor has high sensitivity , low-cost , simple structure , high sensitivity , and other advantages. Such optical oxygen sensor is typically by the light emission intensity on the oxygen concentration in a highly sensitive light - emitting molecules and vectors . Oxygen molecules through the pores of the carrier arrives at the luminescent molecules and quenching its luminescence , due to the luminous intensity having an oxygen concentration dependent properties to achieve the detection of the oxygen concentration . Design and optimization of such sensors is usually from the interaction design choices as well as between the two luminescent molecules and carrier material to consider . Therefore, exploration and development of new oxygen sensor dissolved oxygen sensor gradually become a hot research topic in the field of chemical sensors . In this thesis, cetyl trimethyl ammonium bromide as a template to prepare a MSU wormlike pore structure of mesoporous materials , the use of the covalent bond to the Ir (III) complexes grafted on the channel walls system to study the luminescence and oxygen sensing performance , organically modified synthetic 1,10 - phenanthroline organically modified silicate hydrolysis Phen- Si , it not only can be used as dimeric complexes [ Ir (ppy) 2Cl] 2 of the auxiliary ligand , and as a Precursor by the TEOS hydrolysis and polycondensation reactions of metal iridium complexes connected by a Si-C bond to the silica mesoporous skeleton , hybrid materials prepared luminescence and optical oxygen sensor performance . The small angle X - ray diffraction calculated composite mesoporous material pore diameter is and 4.42nm, larger pore size is conducive to the diffusion of oxygen in the carrier . The Sensitivity ( I0/I100 ) was 1.6, and the dual Sites of model of the Stern-Volmer curve fitting . Its response time and the reduction time was 8 s and 16 s, and a faster response time and good reproducibility and may be related to the presence of composite pore structure of mesoporous materials . The resulting material has potential as a performance oxygen sensing material .

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Structural Chemistry > Complex chemistry ( coordination chemistry )
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