FIGURE 3.

Physical Attributes of Fabricated Sensor. Our sensor was cut from a larger PDMS membrane using a 6 mm punch (A), and the mimimum thickness we achieved was slightly less than 2 mm (B). Using a smaller volume of HPTS allowed for thinner membranes, but reliably aligning the fiber optic sensor with a CO₂ sensing droplet with a volume under 0.75 uL became the limiting factor (C) Multiple sensor compositions can easily be deposited in any 2D configuration allowing for rapid multiplex development. (D) Sensors made from PDMS have the added benefit of a high level of stretchability and flexibility, allowing for deployment in diverse geometric configurations.