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Pressure sensors comprise about 60% of the MEMS market. Among the various types of pressure sensors, piezoresistive pressure sensors are easy to design to suit a wide range of pressures. Our pressure transducers are miniature piezoresistive based sensors fabricated using silicon micromachining techniques, which enable great precision in realizing the diaphragm. The diaphragm acts as the sensing element and the piezoresistors serve as transducers.

Energy in vibrations is a potential source of power for low power sensing nodes. Sensing nodes are employed for intelligent ambient monitoring and information dissemination. The primary challenge in making a sensing node autonomous is the ability to power it continuously. The conventional method of powering these nodes through batteries has an associated drawback of periodic maintenance and replacement. Alternative methods of powering sensing nodes are gaining impetus with the advent of low power electronics.

One possible means of bridging the gap between India’s abundant, varied natural resources and her ever-increasing requirements like clean water, food and rapid, low cost diagnostic machinery is the use of nanotechnology, write Arindam Ghosh and Yamuna Krishnan in the international journal Nature Nanotechnology.

The most ubiquitous form of energy around us, light, is surprisingly underutilised. This is largely because photo-based devices are very inefficient at absorbing and then converting light into a useful electrical signal. Now researchers at the Indian Institute of Science have designed a novel device based on graphene and metal nanoparticles that shows greatly enhanced response to light and is colour sensitive. This may foster applications like colour based ultra-sensitive photodetectors, efficient solar cells and detection of single molecules.

Researchers from the IISc have developed a new way to design thin, porous membranes that can be used for water filtration. By carefully mixing two polymers, and adding some nanostructures, they obtained membranes with ultrasmall holes in it. They have also shown that these membranes are more efficient in killing the bacteria commonly found in drinking water.

Devices, sensors and lights everywhere. These elements increasingly surround us in a modern setting. What do all these cogs of technology need in common? Power, to run uninterrupted. Often this power is provided by bulky batteries that need timely replacement making them an inconvenience. What if these devices, sensors and tiny lights could run on energy extracted out of thin air!

Protecting organic devices against water vapour is a concern for many scientists. Organic devices are known to be highly reactive to atmospheric water vapour, a significant cause for their premature degradation. A successful solution was generated by a team of four researchers at the Department of Chemical Engineering in IISc. Using a polymeric nanocomposite, they have devised an efficient and economical barrier to protect organic devices.

IISc researchers have successfully found a way to navigate tiny, geometrically identical filaments, and subsequently place them at predefined positions with respect to each other. The method works without any physical contact with the filaments, and this can have important applications in nanomedicine.

“When hydrogen gas comes in contact with air, it becomes a bomb.” says Prof. Navakanta Bhat from the Centre for Nano Science and Engineering, and Department of Electrical Communication Engineering at the Indian Institute of Science (IISc). Hydrogen gas sensors have made it possible to detect leaks and maintain high levels of safety. Prof. Bhat and his group of scientists at IISc have succeeded in designing the best hydrogen gas sensor known till date.

Researchers at the Indian Institute of Science (IISc) have designed a new type of energy harvester that can scavenge electrical energy from weak vibrations. Vibration drives a liquid droplet and the motion of the liquid droplet produces electrical energy which can power portable electronic devices efficiently.

Conventional sources of energy are precious and they are getting exhausted at a very rapid pace. Scientists are looking for alternative sources of energy, like solar energy, wind energy, energy from bio waste etc., to replace the conventional sources. “Energy harvesting” is the conversion of unusual forms of energy, like heat, wind, vibration etc., which are otherwise wasted, into some usable form of energy. Efficient energy harvesting is the key to addressing our ever-increasing energy problem.

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