Abstract
This paper presents a highly sensitive fiber-optic oxygen sensor. The sensor was fabricated using palladium (II) meso-tetrakis (pentafluorophenyl) porphyrin (PdTFPP) and porous silica nanoparticles embedded in a tetraethylorthosilane (TEOS)/n-octyl-triethoxysilane (Octyl-triEOS) composite xerogel present as a coating on the end of the fiber. Sensitivity is quantified in terms of the ratio IN2/IO2, where IN2 and IO2 represent the intensity of fluorescence detected in a pure nitrogen or pure oxygen environment. The experimental results reveal that this PdTFPP-doped oxygen sensor with porous silica nanoparticles has a sensitivity of IN2/I100O2 = 386. The results also show that this sensor has higher sensitivity than an oxygen sensor based on Pd(II) complex immobilized in a sol-gel matrix. Furthermore, the optical oxygen sensor yields a linear Stern–Volmer plot. The proposed optical sensor has the advantages of easy fabrication, low cost, and high sensitivity to oxygen.
Highlights
Oxygen plays an essential role as either a reactant or a product in many chemical and biochemical reactions
The experimental results show that the palladium (II) meso-tetrakis (pentafluorophenyl) porphyrin (PdTFPP)-doped n-propyl-TriMOS/TEOS/Octyl-triEOS oxygen sensor has a sensitivity of IN2 /I100O2 = 263. These results show that optical oxygen sensors based on PdTFPP have excellent sensitivity
Because a high surface-to-volume ratio is an important property for optical oxygen sensors, our lab presents a highly sensitive optical oxygen sensor based on the tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) ([Ru(dpp)3 ]2+ ) and porous silica nanoparticles embedded in a TEOS/Octyl-triEOS composite xerogel
Summary
Oxygen plays an essential role as either a reactant or a product in many chemical and biochemical reactions. We present a high-performance optical fiber oxygen sensor based on PdTFPP embedded in a n-propyltrimethoxysilane (n-propyl-TriMOS)/tetraethylorthosilane (TEOS)/n-octyltriethoxysilane (Octyl-triEOS) composite xerogel. Because a high surface-to-volume ratio is an important property for optical oxygen sensors, our lab presents a highly sensitive optical oxygen sensor based on the tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) ([Ru(dpp)3 ]2+ ) and porous silica nanoparticles embedded in a TEOS/Octyl-triEOS composite xerogel. The objective of the current study was the development of a fiber-optic oxygen sensor with improved sensitivity It is based on a Pd(II) complex (PdTFPP) with the porous silica nanoparticles embedded in an Octyl-triEOS/TEOS sol-gel matrix which exists as a coating on the end of the optical fiber. Results show that the proposed fiber-optic oxygen sensor can be used for applications that require high sensitivity
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