📌 Topic 04 of 6 · Chapter 08 · Nanotechnology & Material Science
Nanotechnology in Electronics & Smart Materials
Nano transistors, quantum dots, shape memory alloys, smart materials — complete notes for UPSC & PSC exams.
⚗️ Nanotechnology in Electronics
- Nano transistors — transistors at nanometre scale; enables more powerful, energy-efficient chips; Moore’s Law
- QLED displays — Quantum dot LED displays; Samsung QLED TVs use quantum dots for vivid colours
- Nano memory — carbon nanotube-based memory; faster and denser than conventional memory
- Flexible electronics — graphene-based flexible displays and circuits
- Nano sensors — detect chemicals, gases, biological molecules at very low concentrations
⚗️ Smart Materials
- Shape Memory Alloys (SMAs) — return to original shape when heated; Nitinol (Nickel-Titanium); used in medical stents, orthodontic wires
- Piezoelectric materials — generate electricity when stressed; used in sensors, actuators, energy harvesting
- Magnetostrictive materials — change shape in magnetic fields; used in actuators
- Electrochromic materials — change colour with voltage; smart windows
- Self-healing materials — repair themselves when damaged; inspired by biological systems
⭐ Key Facts:
• QLED = Quantum dot LED = Samsung TVs = vivid colours
• Shape Memory Alloys = Nitinol = return to shape when heated = medical stents
• Piezoelectric = electricity from stress = sensors, energy harvesting
• Nano transistors = smaller, faster, more efficient chips
• Graphene = flexible electronics = future displays
• QLED = Quantum dot LED = Samsung TVs = vivid colours
• Shape Memory Alloys = Nitinol = return to shape when heated = medical stents
• Piezoelectric = electricity from stress = sensors, energy harvesting
• Nano transistors = smaller, faster, more efficient chips
• Graphene = flexible electronics = future displays