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low density polyethylene

v Research on the best alcohol sensor technology. (Marissa) v Research on Fuel Cell Technology Material: fuel cell, pump, mouthpiece,

printed circuit board (PCB), and a liquid crystal display (LCD) or light- emitting diode (LED). All of the aforementioned materials will are typically contained within a plastic case generally made from low density polyethylene (LDPE), polypropylene (PP), or polystyrene (PS) plastic. (David)

v Research on similar schematics (Marissa) v Research on how to build a fuel cell alcohol sensor (David)

2. Research was conducted on the pros and cons of using a semiconductor for the alcohol sensor and also a visual of how fuel cell technology would work as an alcohol sensor. Semiconductors

v In semiconductor devices a sensor is formed from a small and inexpensive bead of metal oxide, where a voltage is applied to produce a small standing current. When alcohol or other substances come into contact with this bead, they change the surface resistivity and so too the standing current. The change in current is used to measure the concentration of the substance in the sample. (David)

v The drawbacks to semiconductor accuracy, reliability and trustworthiness include: (Marissa)

v Non alcohol specific. Semiconductors react to other chemicals such as

hairspray, gasoline vapor, cigarette smoke, and breath acetone. (Marissa) v Short working life. (David) v Sensor saturation. Sensor saturation with alcohol or contamination with

smoke during a test can rapidly destabilize the semiconductor device and throw-off the results. (Marissa)

v Drift. Semiconductors show a wide variation in readings especially as the unit gets older and receives more use. (David)

3. Next week’s research will focus on how to purchase or build a fuel cell.