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

Yu, Hao; Eggleston, Carrick; Chen, Jiajun; Wang, Wenyong; Dai, Qilin; Tang, Jinke

doi:10.3390/s121217330

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

Journal Article · Fri Nov 30 23:00:00 EST 2012 · Sensors

DOI:https://doi.org/10.3390/s121217330· OSTI ID:1628537

Yu, Hao ^[1]; Eggleston, Carrick ^[2]; Chen, Jiajun ^[3]; Wang, Wenyong ^[3]; Dai, Qilin ^[3]; Tang, Jinke ^[3]

Univ. of Wyoming, Laramie, WY (United States). Dept. of Chemical and petroleum Engineering; DOE/OSTI
Univ. of Wyoming, Laramie, WY (United States). Dept. of Geology and Geophysics
Univ. of Wyoming, Laramie, WY (United States). Dept. of Physics and Astronomy

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.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Wyoming, Laramie, WY (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0004981

OSTI ID:: 1628537

Journal Information:: Sensors, Journal Name: Sensors Journal Issue: 12 Vol. 12; ISSN SENSC9; ISSN 1424-8220

Publisher:: MDPI AGCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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Optical Waveguide Lightmode Spectroscopy (OWLS) as a Sensor for Thin Film and Quantum Dot Corrosion

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