CD players have almost disappeared from stores, but the compact disc still exists. CD album sales evenlast year for the first time in 17 years. But the support in lasts much longer than necessary and the majority of CDs are likely to end up in a landfill sooner or later.
Researchers fromin Binghamton, have found a new solution for , or at least golden CDs. In an article published in the journal they describe their simple method for reusing the gold layer to create . They can monitor electrical activity in the heart and muscles, blood flow, as well as the levels of , pH and oxygen.
Sensors in less than half an hour with consumer equipment
To separate the metal layer from the plastic backing, the researchers dip the CD infor a minute and a half. the is removed using an adhesive polyimide strip which also serves as a support for . They then use a consumer cutting machine (CricutMaker) available for a few hundred euros to cut patterns in the metal layer and thus create the . It’s the specific that determines what the sensor measures.
The manufacturing process requires between 20 and 30 minutes; it does not use any hazardous products or industrial devices and costs about $1.50. They can then connect a small Bluetooth module equipped with a battery in order to send the data wirelessly to a smartphone. Researchers now want to explore thesilver CDs, more common, and test the laser to speed up the process.