Nanomaterials Applications in Electronics - V Unit Notes

 

·   Transistors have gotten smaller through nanotechnology. Around 2001, a typical transistor was 130 to 250 nanometers in size. In 2014, Intel created a 14 nanometer transistor, then IBM created the first seven nanometer transistor in 2015, and then Lawrence Berkeley National Lab demonstrated a one nanometer transistor in 2016.  Research is on going to use single molecules as transistors.

·  Using magnetic random access memory (MRAM), computers will be able to “boot” almost instantly. MRAM is enabled by nanometer‐scale magnetic tunnel junctions and can quickly and effectively save data during a system shutdown or enable resume‐play features.

·  Ultra-high definition displays and televisions are now being sold that use quantum dots to produce more vibrant colors, while being energy efficient.

·   Flexible, bendable, foldable, rollable and stretchable electronics are reaching into various sectors and are being integrated into a variety of products, including  wearables, medical applications, aerospace applications, and the Internet of Things. Flexible electronics have been developed using, for example, semiconductor nanomembranes for applications in smartphone and e-reader displays. Nanomaterials like graphene and cellulosic nanomaterials are being used for various types of flexible electronics to enable wearable and “tattoo” sensors, photovoltaics that can be sewn onto clothing, and electronic paper that can be rolled up. Making flat, flexible, lightweight, non-brittle, highly efficient electronics opens the door to countless smart products.   

· Computing and electronic products include Flash memory chips for smart phones and thumb drives; ultra-responsive hearing aids; antimicrobial/antibacterial coatings on keyboards and cell phone casings; conductive inks for printed electronics for RFID/smart cards/smart packaging; and flexible displays for e-book readers.

·   Nanoparticle copper suspensions have been developed as a safer, cheaper, and more reliable alternative to lead-based solder and other hazardous materials commonly used to fuse electronics in the assembly process.

·    DNA can be used as scaffolding for assembling molecules into electronic circuitry. This is used to integrate novel devices at densities far beyond those possible lithographic techniques. Studies on DNA showed a wide range of electron transport behavior. DNA can act as an insulator, a semiconductor, a conductor and a super conductor offering future bio-compatible devices and circuits.

·   Nanomaterials research, especially molecular electronics has demonstrated the new electrical element ‘Memristor’. Memristor has the capability of remembering the current it experienced in the past.  So Memristor research offers a possibility to implement 50Gbytes of low-power memory in mobile devices.

·   Nanomagnetics provide an opportunity to realize zero-energy switching logic gates and memory. Phase change memory (PCM) is considered one of the most promising candidates for next-generation nonvolatile memory, based on its excellent characteristics of high speed, large sense margin, good endurance, and high scalability.