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(A) Schematics of fabrication steps and (B) computer-aided design (CAD) drawing of the disposable cellulose paper-based electrochemical sensor for on-site testing of H2O2 in exhaled breath with poly-methylmethacrylate (PMMA) carrier. (C) Model of a filter extension for respiratory mask. (D) Image of respiratory mask with the commercial filter extension with customized sidewalls, containing the sensor chip. Reproduced and adapted with permission of American Chemical Society [29].
