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Sensors 2012, 12(12), 17330-17342; doi:10.3390/s121217330
Article

Optical Waveguide Lightmode Spectroscopy (OWLS) as a Sensor for Thin Film and Quantum Dot Corrosion

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Received: 5 October 2012; in revised form: 16 November 2012 / Accepted: 30 November 2012 / Published: 13 December 2012
(This article belongs to the Section Physical Sensors)
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Abstract: Optical waveguide lightmode spectroscopy (OWLS) is usually applied as a biosensor system to the sorption-desorption of proteins to waveguide surfaces. Here, we show that OWLS can be used to monitor the quality of oxide thin film materials and of coatings of pulsed laser deposition synthesized CdSe quantum dots (QDs) intended for solar energy applications. In addition to changes in data treatment and experimental procedure, oxide- or QD-coated waveguide sensors must be synthesized. We synthesized zinc stannate (Zn2SnO4) coated (Si,Ti)O2 waveguide sensors, and used OWLS to monitor the relative mass of the film over time. Films lost mass over time, though at different rates due to variation in fluid flow and its physical effect on removal of film material. The Pulsed Laser Deposition (PLD) technique was used to deposit CdSe QD coatings on waveguides. Sensors exposed to pH 2 solution lost mass over time in an expected, roughly exponential manner. Sensors at pH 10, in contrast, were stable over time. Results were confirmed with atomic force microscopy imaging. Limiting factors in the use of OWLS in this manner include limitations on the annealing temperature that maybe used to synthesize the oxide film, and limitations on the thickness of the film to be studied. Nevertheless, the technique overcomes a number of difficulties in monitoring the quality of thin films in-situ in liquid environments.
Keywords: OWLS; AFM; waveguide sensors; thin films; quantum dots; ZTO; CdSe OWLS; AFM; waveguide sensors; thin films; quantum dots; ZTO; CdSe
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Yu, H.; Eggleston, C.M.; Chen, J.; Wang, W.; Dai, Q.; Tang, J. Optical Waveguide Lightmode Spectroscopy (OWLS) as a Sensor for Thin Film and Quantum Dot Corrosion. Sensors 2012, 12, 17330-17342.

AMA Style

Yu H, Eggleston CM, Chen J, Wang W, Dai Q, Tang J. Optical Waveguide Lightmode Spectroscopy (OWLS) as a Sensor for Thin Film and Quantum Dot Corrosion. Sensors. 2012; 12(12):17330-17342.

Chicago/Turabian Style

Yu, Hao; Eggleston, Carrick M.; Chen, Jiajun; Wang, Wenyong; Dai, Qilin; Tang, Jinke. 2012. "Optical Waveguide Lightmode Spectroscopy (OWLS) as a Sensor for Thin Film and Quantum Dot Corrosion." Sensors 12, no. 12: 17330-17342.


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