Advanced fiber optic fluorescence turn-on molecular sensor for highly selective detection of copper in water

Yasser Chiniforooshan; Jianjun Ma; Wojtek J. Bock; Wenhui Hao; Zhi Yuan Wang

doi:10.1117/12.920843

4 May 2012 Advanced fiber optic fluorescence turn-on molecular sensor for highly selective detection of copper in water

Yasser Chiniforooshan, Jianjun Ma, Wojtek J. Bock, Wenhui Hao, Zhi Yuan Wang

Proceedings Volume 8370, Fiber Optic Sensors and Applications IX; 83700A (2012) https://doi.org/10.1117/12.920843
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

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.

Citation Download Citation

Yasser Chiniforooshan, Jianjun Ma, Wojtek J. Bock, Wenhui Hao, and 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); https://doi.org/10.1117/12.920843

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