Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 138, Issue 1, Pages 134-137Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2009.02.049
Keywords
Uranyl; Fluorescence standoff sensor; Directed fluorescence; Silica gel
Funding
- US Department of Energy NNSA [DE-FG52-06NA27491]
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A passive signal enhancement device for the standoff detection of uranium in soil was developed and tested. The device consists of a spherical ball lens half-coated with a polymer-silica gel composite. The nanoporous silica gel, when placed in contact with moist soil, absorbs water and dissolved uranyl ions and significantly enhances the fluorescence intensity of the uranyl. The ball lens focuses the UV excitation energy to the focal point of the lens located within the silica gel layer and directs the resulting fluorescence signal back towards the excitation source. Our results show that this 'Directed Fluorescence' (DF) device can be used to enhance the Uranyl fluorescence signal intensity by more than 200 times. Consequently. the maximum standoff detection distance is increased by more than an order of magnitude. (C) 2009 Elsevier B.V. All rights reserved.
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