Carvajal, M. A. published the artcileHand-held optical instrument for CO2 in gas phase based on sensing film coating optoelectronic elements, Quality Control of 596-01-0, the publication is Sensors and Actuators, B: Chemical (2010), 144(1), 232-238, database is CAplus.
Different strategies were tested to include a CO2 optical gas sensor in a low-cost portable electronic instrument. Plastic solid-state sensor membranes are based on the quenching of a phosphorescent dye by the deprotonated form of a nonluminescent pH indicator. As a result of this study, the configuration with both optoelectronic components coated with sensing chem. (LED with the luminophore and photodetector with the pH-active dye) presents a better CO2 response in terms of sensitivity and reproducibility than the other configurations studied by the authors. The portable measurement system resulting from the integration of coated LED with the luminophore and photodetector with the pH indicator was characterized in terms of calibration, sensitivity, short and long-term stability, transient response and thermal dependence with results comparable to laboratory instrumentation and other sensing films described in literature. The sensor calibration curve was modeled according to a theor. model, reported in the literature, with two coefficients, which was included in the microcontroller of the measurement system to provide a direct reading of the gas concentration in the display. The sensor’s full range is 0-100% CO2 concentration The study of the response time of the membranes was made, obtaining response t90 and recovery t10 times of 31 and 117 s, resp. Temperature dependence was successfully fitted to an Arrhenius type function that was included in the microcontroller of the instrument, to calculate and display the CO2 concentration, correcting the temperature dependence. The characterization demonstrated the reliability and good performance of this type of solution aimed at integrating chem. sensors in electronic and optoelectronic devices. The localization of the sensing film on the detector and on the light source makes any addnl. optical element unnecessary, thus reducing system costs, avoiding alignment problems, optimizing the efficiency of the signal collection and making it possible to replace the sensor easily.
Sensors and Actuators, B: Chemical published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Quality Control of 596-01-0.
Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem