Contamination due to process gases

High performance optical trace oxygen sensors based on NIR-emitting benzoporphyrins covalently coupled to silicone matrixes

“…Most oxygen sensors are suitable for measurements of physiologically relevant oxygen concentrations, but they are not optimized for detecting very low oxygen concentrations. However, trace oxygen sensing is of much interest in academia and also in industry, for example for surface treatment [1], in semiconductor industry [2], corrosion protection [3] or in order to find leaks in bottles [4]. Ultra-trace oxygen concentrations are of particular interest in aquatic biology and oceanography especially for investigation of so called oxygen minimum zones which can provide important insights on the mechanism of evolution of aerobic organisms [5,6].…”

“…Compound 3b -Pd-TPTBPtBu 4 Br 4This compound was prepared analogously to Pt-TPTBPtBu 4 Br 4 . Metalation was performed in boiling toluene using 250 mg of free-base porphyrin and 1.2 eq Pd(C 6 H 5 CN)2 Cl 2 . Yield: 88 mg, 31%; 1 H NMR (300 MHz, Benzene-d6) ı 7.91-7.71 (m, 16H), 7.55-7.24 (m, 12H), 1.25 (m, 36H); MALDI m/z: [M+] calc for C 76 H 64 Br 4 N 4 Pd, 1460.088; found, 1460.076; UV-vis (toluene): max (), nm (M −1 cm −1 ) = 443 (310,000), 634 (140,000).…”

LUMOS - A Sensitive and Reliable Optode System for Measuring Dissolved Oxygen in the Nanomolar Range

“…Monitoring oxygen concentration in the micromolar range is well established and a multitude of commercial sensor systems, both electrochemical and optical, exist. There are, however, numerous applications where lower concentrations of oxygen need to be monitored, such as in industrial process control[ 4 ], and corrosion protection[ 5 ]. Also, a significant number of aerobic or facultative anaerobic organisms grow in conditions with oxygen concentrations significantly below 1 μM (DO) [ 6 – 9 ].…”

Room‐Temperature‐Phosphorescence‐Based Dissolved Oxygen Detection by Core‐Shell Polymer Nanoparticles Containing Metal‐Free Organic Phosphors

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The highly sensitive optical detection of oxygen including dissolved oxygen (DO) is of great interest in various applications.W edevised anovel room-temperature-phosphorescence (RTP)-based oxygen detection platform by constructing core-shell nanoparticles with water-soluble polymethyloxazoline shells and oxygen-permeable polystyrene cores crosslinked with metal-free purely organic phosphors.The resulting nanoparticles showavery high sensitivity for DO with alimit of detection (LOD) of 60 nm and can be readily used for oxygen quantification in aqueous environments as well as the gaseous phase.Quantification of dissolved oxygen (DO) in the range of 1 mm and below has recently attracted considerable attention because its urgent need in numerous applications such as corrosion protection, [1] surface treatment, [2] semiconductor industry, [3] and biological research. [4] Although af ew detection systems such as membrane-inlet mass spectrometry (MIMS) and purge-and-trap gas chromatography-mass spectrometry (P&T) are able to quantify at al ow level, the complex, bulky,and expensive equipment is not portable and requires trained personnel for operation, limiting its applicability for convenient and easy monitoring of DO.

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“…Quantification of dissolved oxygen (DO) in the range of 1 mm and below has recently attracted considerable attention because its urgent need in numerous applications such as corrosion protection, [1] surface treatment, [2] semiconductor industry, [3] and biological research. [4] Although af ew detection systems such as membrane-inlet mass spectrometry (MIMS) and purge-and-trap gas chromatography-mass spectrometry (P&T) are able to quantify at al ow level, the complex, bulky,and expensive equipment is not portable and requires trained personnel for operation, limiting its applicability for convenient and easy monitoring of DO.…”