The Experts below are selected from a list of 14940 Experts worldwide ranked by ideXlab platform
Chang Soo Kim - One of the best experts on this subject based on the ideXlab platform.
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A new pH-ISFET based dissolved oxygen sensor by employing electrolysis of oxygen
Sensors and Actuators B: Chemical, 1996Co-Authors: Byung-ki Sohn, Chang Soo KimAbstract:A new dissolved oxygen sensor based on a pH-ISFET is discussed. A working electrode surrounding a pH-sensing gate of the pH-ISFET electrolyzes dissolved oxygen, resulting in a corresponding pH change near the pH-sensing gate. The pH-ISFET is expected to determine dissolved oxygen concentration by detecting this pH change. The results suggest that the proposed sensor operated by a combined mechanism of an amperometric sensor (Clark type sensor) and a potentiometric sensor (pH-ISFET) is feasible to determine the content of dissolved oxygen. The dependence of sensor output on several factors, such as buffering capacity, bulk pH and stirring of the solution, is investigated and a comparison between the Clark type sensor and proposed sensor is also discussed.
Byung-ki Sohn - One of the best experts on this subject based on the ideXlab platform.
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A new pH-ISFET based dissolved oxygen sensor by employing electrolysis of oxygen
Sensors and Actuators B: Chemical, 1996Co-Authors: Byung-ki Sohn, Chang Soo KimAbstract:A new dissolved oxygen sensor based on a pH-ISFET is discussed. A working electrode surrounding a pH-sensing gate of the pH-ISFET electrolyzes dissolved oxygen, resulting in a corresponding pH change near the pH-sensing gate. The pH-ISFET is expected to determine dissolved oxygen concentration by detecting this pH change. The results suggest that the proposed sensor operated by a combined mechanism of an amperometric sensor (Clark type sensor) and a potentiometric sensor (pH-ISFET) is feasible to determine the content of dissolved oxygen. The dependence of sensor output on several factors, such as buffering capacity, bulk pH and stirring of the solution, is investigated and a comparison between the Clark type sensor and proposed sensor is also discussed.
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A New Ph-isfet Based Dissolved oxygen sensor
Proceedings of the International Solid-State Sensors and Actuators Conference - TRANSDUCERS '95, 1995Co-Authors: Dae-hyuk Kwon, Byung-ki SohnAbstract:A new dissolved oxygen sensor based on pHASFET has been discussed. A platinum working electrode surrounding a pH-sensing gate of the pH-ISFET electrolyzes dissolved oxygen, resulting in a corresponding pH change. The pH-ISFET can determine dissolved oxygen concentration through detecting this pH change.
Santi Nonell - One of the best experts on this subject based on the ideXlab platform.
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singlet oxygen photosensitisation by the fluorescent probe singlet oxygen sensor green
Chemical Communications, 2009Co-Authors: Xavier Ragas, Ana Jimenezbanzo, David Sanchezgarcia, Xavier Batllori, Santi NonellAbstract:The fluorescent probe Singlet oxygen sensor Green® is able to produce singlet oxygen under exposure to UV or visible radiation.
Tetsuro Majima - One of the best experts on this subject based on the ideXlab platform.
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photochemistry of singlet oxygen sensor green
Journal of Physical Chemistry B, 2013Co-Authors: Mamoru Fujitsuka, Tetsuro MajimaAbstract:To detect singlet oxygen (1O2), the commercially available fluorescent sensor named Singlet oxygen sensor Green (SOSG) has been the most widely used from material studies to medical applications, for example, photodynamic therapy. In light of the previous studies, SOSG is a dyad composed of fluorescein and anthracene moieties. In the present study, we carried out quantitative studies on photochemical dynamics of SOSG for the first time, such as the occurrence of intramolecular photoinduced electron transfer (PET), 1O2 generation, and two-photon ionization. It was revealed that these relaxation pathways strongly depend on the irradiation conditions. The visible-light excitation (ex. 532 nm) of SOSG induced intramolecular PET as a major deactivation process (kPET = 9.7 × 1011 s–1), resulting in fluorescence quenching. In addition, intersystem crossing occurred as a minor deactivation process that gave rise to 1O2 generation via the bimolecular triplet–triplet energy transfer (kq = 1.2 × 109 M–1 s–1). Meanwh...
Akiyoshi Asada - One of the best experts on this subject based on the ideXlab platform.
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Planar type of limiting current oxygen sensor
Sensors and Actuators: B. Chemical, 1993Co-Authors: Kohsei Ishibashi, Tsuyoshi Kashima, Akiyoshi AsadaAbstract:The limiting current type oxygen sensor has some excellent features such as compact body, long lifetime, etc. Therefore, it has been applied in various fields. Recently, a new planar type limiting current oxygen sensor was fabricated and the characteristics of this sensor were estimated. The conventional limiting current type oxygen sensor has Pt electrodes on both opposing sides of the zirconia disk. On the other hand, the new type oxygen sensor has Pt electrodes only on one side of the zirconia disk. In addition, the gas diffusion layer that limits the oxygen supply is composed only on the cathode electrode. These sensor structures seem favorable to the integration of the sensor as well as to the manufacturing process. In this paper, parameters affecting the sensor characteristics were investigated. The parameters include electrode separation and electrode width. In these investigations, concerning the electrode width, the effect of the electrode edge was superior, i.e. the electrode width did not affect the sensor characteristics. On the other hand, reduction of electrode separation was found to give good sensor characteristics. The theoretical analysis will help to modify these parameters. © 1993.
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Limiting current type of oxygen sensor with high performance
Sensors and Actuators B-chemical, 1990Co-Authors: Akiyoshi Asada, Hideo Yamamoto, Mitsuhiro Nakazawa, Hiroshi OsanaiAbstract:Abstract A limiting current type of oxygen sensor using a zirconia solid electrolyte has been developed and used for many applications. This sensor has some excellent features such as a long life, no reference gases, a compact body and is maintenance free. However, there were some problems to be solved for practical usage. Some improvements have been made in order to realize a high performance oxygen sensor. The main improved items are the response time, vibration resistance, waterproofness and lifetime. Details of improved items and characteristics of this sensor are reported in this paper. As a result, a high performance oxygen sensor that has a fast response time, less than 5 s, a high vibration resistance against ±30 g , a waterproof property and a long lifetime of about 20 000 hours even in high oxygen concentrations such as 90% O 2 , was realized.
