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. Author manuscript; available in PMC: 2020 May 21.
Published in final edited form as: Analyst. 2019 Apr 10;144(10):3314–3322. doi: 10.1039/c9an00374f

Figure 2.

Figure 2.

(A) Microscope image of a 3-μm-thick layer of low-permeability Parylene C (PC) membrane deposited on the surface of the LFA ruler. Scale bar, 50 μm. (B) The ink advancement distances in different LFA rulers with/without PC membrane, pushed by oxygen generated as a result of different numbers of PtNPs (0, 5.6 × 104; 0, 5.6 × 104, respectively) reacting with 30% H2O2. Illustrations on both sides are the enlarged views of the black dotted rectangles. Under a certain angle of illumination, the label on the device without PC membrane is gray; the label on the device with PC membrane is colored.