4 May 2012 Advanced fiber optic fluorescence turn-on molecular sensor for highly selective detection of copper in water
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In this article a novel advanced fiber-optic fluorescent sensor is demonstrated. The sensor is based on collection of the fluorescence from the sidewall of the multimode optical fiber which is partly de-cladded and covered by the sample under the test (SUT). The most part of the fluorescent intensity is carried by the leaky rays which are inaccessible in traditional evanescent-wave fluorescence fiber sensors. In the proposed structure, some part of a refracting power is collected in the de-cladded segment and used to excite the lower order lossless modes in cladded part by a sidewall mode mixer. In addition to the higher level of fluorescence collection, the architecture allows us to multiplex several different channels along one fiber, since we use only a small segment of the normal (not tapered) sidewall for each channel.A highly efficient fluorescence turn-on molecular probe is applied to this advanced fiber-optic structure, for sensitive and selective detection of Cu+2 in water. The fluorescence turn-on molecular probe is a mixture of a fluorophore polymer P1and M1 as a Cu receptor and a fluorescent quencher. The P1 is used as an indicator which generates the fluorescence centered at the wavelength of 650 nm and then, with a proper amount of M1 solution, the fluorescence is quenched up to 53% of its maximum intensity. The P1-M1 pair is broken by absorption of Cu with the M1 and the fluorescence is released again. This turn-on effect is used for detection of Cu with a low detection limit of 0.02689 g/ml.
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Yasser Chiniforooshan, Yasser Chiniforooshan, Jianjun Ma, Jianjun Ma, Wojtek J. Bock, Wojtek J. Bock, Wenhui Hao, Wenhui Hao, Zhi Yuan Wang, Zhi Yuan Wang, } "Advanced fiber optic fluorescence turn-on molecular sensor for highly selective detection of copper in water", Proc. SPIE 8370, Fiber Optic Sensors and Applications IX, 83700A (4 May 2012); doi: 10.1117/12.920843; https://doi.org/10.1117/12.920843

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