02305nas a2200229   4500008004100000022001400041245009800055210006900153260000800222300001600230490000700246520152100253653000801774653001901782653003501801653000901836653003001845653003001875100002401905700001801929856012801947       2023                        eng d  a0360-319900aScalable optical fiber reactor for photocatalytic H2 production: addressing scattering issues0 aScalable optical fiber reactor for photocatalytic H2 production   cMAY  a17086-170960 v483 a<p>
	Scattering is one of the main challenges in scaling up photocatalytic water splitting using the most prevalent powder catalysts. This can be overcome by decoupling the reaction medium from light transmission, as in the case of optical fibers. Here we explore utilizing optical fibers coated with 5 wt% CuO supported on TiO2 for photocatlytic H2 production from water-methanol mixtures. CuO/TiO2 is a well studied photo catalyst in which photoreduced Cu species are known to act as sensitizers for inducing visible light activity. Lower activity of sequentially coated systems indicates that appropriate interfaces of active Cu and TiO2 with water are desirable. The scalability of such optical fiber-based systems along with potential in non-potable turbid water media are demonstrated. Maximum activity of 22 mmoles of H2 in 8 h was obtained with 50 mg of catalyst coated on optical fibers, which increases linearly with increase in fiber numbers, whereas, drastic reduction in activity is observed in powder catalyst upon increasing the catalyst quantity. A one-to-one comparison of 700 mg of catalyst in powder form and coated on optical fibers indicates more than one order enhancement in activity in the optical fiber based system. In addition, -70% retention in activity in highly turbid non-potable water was observed as compared to powdered system which shows complete reduction in the activity by 99.99%. (c) 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.</p>
10aCuO10aOptical fibers10aphotocatalytic water splitting10aTiO210aTotal internal reflection10aVisible light utilisation1 aWalko, Priyanka, S.1 aDevi, Nandini  uhttps://library.ncl.res.in/content/scalable-optical-fiber-reactor-photocatalytic-h2-production-addressing-scattering-issues02461nas a2200409   4500008004100000022001400041245008800055210006900143260000900212300001600221490000700237520122100244653001601465653002501481653001701506653001501523653002601538653001901564653002201583653001301605653002101618653001601639653004201655653001201697653001301709653002401722100002001746700002401766700002201790700002001812700001601832700002101848700002201869700002101891700002101912856011801933       2024                        eng d  a1530-437X00aPolymeric PEI/PEG coated optical fiber fabry-perot interferometer for CO2 detection0 aPolymeric PEIPEG coated optical fiber fabryperot interferometer   cDEC   a40883-408890 v243 a<p>
	Monitoring carbon dioxide (CO2) gas is essential for numerous applications, but the detection of CO2 in miniaturized devices presents significant challenges. In this study, a polyethyleneimine/poly(ethylene glycol) (PEI/PEG) coated optical fiber Fabry-Perot interferometer (FPI) and its charge transfer process toward CO2 are investigated. Scanning electron microscopy and Fourier transform infrared spectroscopy were used to analyze the surface morphology and vibration bands of the PEI/PEG composite. The PEI/PEG composite Fabry-Perot (FP) cavity of length similar to 13 mu m is coated at the distal end of the single-mode fiber using a dip coating technique. A highly sensitive optical and low-cost FPI probe fabrication has displayed a linear sensitivity of 17.10 nm/% in the range of 0.31%-1.25% CO2 gas. The response and recovery times of the sensor are in a few tens of seconds. The enhanced performance of the sensor is primarily due to the protonation and charge transfer between CO2 gas molecules and PEI/PEG composite. Due to low-cost fabrication and high sensitivity, this FPI sensor can be used in a range of potential applications in bioprocessing, healthcare, and environmental monitoring.</p>
10adip coating10aFresnel's reflection10aInterference10amonitoring10aOptical fiber sensors10aOptical fibers10apolymer composite10aPolymers10arefractive index10asensitivity10aSensor phenomena and characterization10asensors10aswelling10aTemperature sensors1 aPawar, Dnyandeo1 aPresti, Daniela, Lo1 aLemma, Enrico, D.1 aRainer, Alberto1 aKumar, Ajay1 aKanawade, Rajesh1 aSilvestri, Sergio1 aSchena, Emiliano1 aMassaroni, Carlo  uhttps://library.ncl.res.in/content/polymeric-peipeg-coated-optical-fiber-fabry-perot-interferometer-co2-detection