* polymer membranes are more suitable for implantation in the human body
* they are hundreds of times more flexible than conventional materials
* they use less power and could run longer on batteries for non-medical applications
MEMS bridge the worlds of electricity and mechanics. They have a variety of applications in consumer electronics, automobiles, and medicine. MEMS sensors, like the accelerometer that orients your smartphone screen vertically or horizontally, gather information from their surroundings by converting movement or chemical signals into electrical signals. MEMS actuators, which may focus your next smartphone's camera, work in the other direction, executing commands by converting electrical signals into movement.
Both types of MEMS depend on micro- and nano-sized components, such as membranes, either to measure or produce the necessary movement.
For years, MEMS membranes, like other MEMS components, were primarily fabricated from silicon using a set of processes borrowed from the semiconductor industry. TAU's new printing process, published in Microelectronic Engineering and presented at the AVS 59th International Symposium in Tampa, FL, yields rubbery, paper-thin membranes made of a particular kind of organic polymer. This material has specific properties that make it attractive for micro- and nano-scale sensors and actuators. More importantly, the polymer membranes are more suitable for implantation in the human body than their silicon counterparts, which partially stems from the fact that they are hundreds of times more flexible than conventional materials.
The unique properties of the polymer membranes have unlocked unprecedented possibilities. Their flexibility could help make MEMS sensors more sensitive and MEMS motors more energy efficient. They could be key to better cameras and smartphones with a longer battery life.
Polymer membranes could be used in devices like diagnostic tests and smart prosthetics. There are already bionic limbs that can respond to stimuli from an amputee's nervous system and the external environment, and prosthetic bladders that regulate urination for people paralyzed below the waist. Switching to MEMS made with the polymer membranes could help make such prosthetics more comfortable, efficient, and safer for use on or inside the body.
"The use of new, soft materials in micro devices stretches both the imagination and the limits of technology," Engel says, "but introducing polymer MEMS to industry can only be realized with the development of printing technologies that allow for low cost mass production. The team's new polymer membranes can already be quickly and inexpensively produced.
The polymer base for the membranes was supplied along with a grant by French chemical producer Arkema/Piezotech. "They just gave us the material and asked us to see what devices we could create with it," Engel reports. "This field is like Legos for grownups."
The next step, she says, is to use the printing process to make functional sensors and actuators almost entirely out of the polymer at the micro- and nano-scales. Such flexible machines could be put to use in things like artificial muscles and screens so flexible that you can roll them up and put them in your pocket.
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