28 February 2014 Universal lab on a smartphone: a research of TiOPc thin film as a light dependence electrode
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In this paper, we study the photoconductivity of a polymer-based TiOPc (Titanium Oxide Phthalocyanine) thin-film for the development of a multi-opto-piezoelectric-valve-array. Using a polymer-based TiOPc thin film to serve as the electrode and a structural layer of a piezoelectric polymer, P(VDF-TrFE) poly[(vinylidenefluoride-co-trifluoroethylene], an optical control valve-array could be developed for manipulating multiple microdroplets for the application of digital microfluidic. In this ongoing project, the dependency of the light intensity, thickness, and composition of spin-coated polymer-based TiOPc thin-film was studied. The experimental finding suggested that a 14 to 55 times resistivity change could be achieved by controlling the film thickness to be between 0.9 μm and 1.5 μm with TiOPc concentration of 20% and 30% w/w compositions.
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PoHan Lin, PoHan Lin, Y. H. Hsu, Y. H. Hsu, C. K. Lee, C. K. Lee, "Universal lab on a smartphone: a research of TiOPc thin film as a light dependence electrode", Proc. SPIE 8951, Optical Diagnostics and Sensing XIV: Toward Point-of-Care Diagnostics, 89510I (28 February 2014); doi: 10.1117/12.2038465; https://doi.org/10.1117/12.2038465

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