Science & Technology Module

Nanotechnology & Advanced Materials

Nanotechnology involves the manipulation and engineering of matter at the nanoscale, specifically between 1 and 100 nanometers, where quantum confinement effects dominate classical physical behavior. Carbon allotropes play a central role: carbon nanotubes (CNTs) exhibit extraordinary tensile strength and thermal conductivity, while graphene—a two-dimensional single-atom-thick layer of $sp^2$ -hybridized carbon discovered by Andre Geim and Konstantin Novoselov in 2004—demonstrates exceptional electron mobility. Fullerenes ( $C_{60}$ , or Buckyballs) serve as molecular cages for targeted drug delivery in nanomedicine. India launched the Nano Mission in 2007 under the Department of Science and Technology to build advanced fabrication infrastructure and foster nano-biotechnology research.

Practice Topic MCQs All Category Topics

Key Concepts & Examination Highlights

Graphene is a single-layer sheet of carbon atoms arranged in a two-dimensional honeycomb lattice, isolated by Geim and Novoselov in 2004.
Nanomaterials are defined as structures possessing at least one dimension sized between 1 and 100 nanometers.
The Government of India launched the Mission on Nano Science and Technology (Nano Mission) in 2007 under the Department of Science and Technology.
Carbon Nanotubes (CNTs), discovered by Sumio Iijima in 1991, are cylindrical carbon allotropes categorized into Single-Walled (SWCNTs) and Multi-Walled (MWCNTs) with exceptional tensile strength and thermal conductivity.
Fullerenes (such as Buckminsterfullerene, $C_{60}$ ) are spherical carbon allotropes discovered in 1985 by Harold Kroto, Robert Curl, and Richard Smalley, for which they received the 1996 Nobel Prize in Chemistry.
Quantum dots are nanoscale semiconductor particles (2–10 nm) whose electronic and optical properties vary with particle size due to quantum confinement effects, earning the 2023 Nobel Prize in Chemistry.
The surface-area-to-volume ratio increases dramatically at the nanoscale, making nanomaterials significantly more reactive and catalytic than their bulk counterparts.
In nanomedicine, targeted drug delivery utilizes liposomes, polymeric nanoparticles, and functionalized dendrimers to release therapeutic compounds directly at tumor sites with minimal systemic toxicity.
Carbon aerogels and graphene aerogels are among the lowest-density solid materials known, featuring high porosity, exceptional thermal insulation, and high electrical capacitance.
Scanning Tunneling Microscopy (STM) and Atomic Force Microscopy (AFM) are primary characterization instruments capable of imaging and manipulating individual atoms on material surfaces.
Shape memory alloys (such as Nitinol, a nickel-titanium alloy) can recover their original shape upon heating above their transformation temperature, finding extensive use in biomedical stents and aerospace actuators.
Carbon nanotubes (CNTs), discovered by Sumio Iijima in 1991, exhibit extraordinary tensile strength and thermal conductivity, existing in single-walled (SWCNT) and multi-walled (MWCNT) structures.
Graphene, isolated by Andre Geim and Konstantin Novoselov in 2004 using mechanical exfoliation (Scotch tape method), is a single two-dimensional layer of $sp^2$ -hybridized carbon atoms arranged in a hexagonal lattice.
Quantum dots are nanoscale semiconductor particles (typically 2-10 nm) whose optical and electronic properties vary according to size due to quantum confinement effects.
The 2023 Nobel Prize in Chemistry was awarded to Moungi Bawendi, Louis Brus, and Alexei Ekimov for the discovery and synthesis of quantum dots.
Surface plasmon resonance (SPR) occurs in noble metal nanoparticles (such as gold and silver), where conduction electrons oscillate collectively in resonance with incident light, enabling ultra-sensitive biosensing.
Fullerenes ( $C_{60}$ , or Buckminsterfullerene), discovered in 1985 by Harold Kroto, Robert Curl, and Richard Smalley, consist of 20 hexagons and 12 pentagons forming a spherical cage.
Nano-fertilizers, such as nano-urea developed by IFFCO, increase nutrient use efficiency and reduce environmental runoff by encapsulating nitrogen in nanoscale carriers for controlled release.
Dendrimers are repetitively branched, monodisperse polymeric macromolecules used in targeted drug delivery systems due to their precise molecular weight and multiple surface functional groups.
Titanium dioxide ( $TiO_2$ ) nanoparticles are widely used in commercial sunscreens because they efficiently absorb and scatter harmful ultraviolet radiation without appearing white on skin.
Scanning Tunneling Microscopy (STM), developed by Gerd Binnig and Heinrich Rohrer in 1981, enables imaging and manipulation of individual atoms on surfaces via quantum tunneling current.
Atomic Force Microscopy (AFM) utilizes a microscopic cantilever with a sharp tip to map surface topography at sub-nanometer resolution by measuring atomic deflection forces.
Nanomedicine utilizes functionalized liposomes and polymer nanoparticles to cross the blood-brain barrier and deliver targeted chemotherapeutic drugs directly to tumor cells.
Self-cleaning coatings utilize the superhydrophobic 'lotus effect', created by micro- and nanoscale surface textures that cause water droplets to roll off, picking up surface dirt.
India's Nano Mission was launched in 2007 by the Department of Science and Technology (DST) to foster capacity building, infrastructure development, and international collaborations in nanoscale research.
Richard Feynman's visionary 1959 lecture 'There's Plenty of Room at the Bottom' is widely considered the conceptual starting point of nanotechnology.
Norio Taniguchi first coined the term 'nanotechnology' in 1974 to describe precision machining and engineering of materials at the nanometer scale.
The lotus leaf exhibits superhydrophobicity (contact angle $> 150^\circ$ ) due to nanoscale epicuticular wax crystals and micro-papillae, known as the lotus effect.
Gecko feet adhesion relies on millions of microscopic setae terminating in nanoscale spatulae that generate strong van der Waals forces with surfaces.
Nano-silver ( $Ag$ nanoparticles) exhibits broad-spectrum antimicrobial, antiviral, and antifungal properties, widely incorporated into wound dressings and consumer fabrics.
Nano-clay polymer composites enhance barrier properties against gases and moisture, utilized in specialized food packaging and automotive components.
Nanoporous membranes made of aligned carbon nanotubes or nanoporous graphene provide high-flux, energy-efficient water desalination via molecular sieving.
Nanowires are one-dimensional structures with diameters on the order of nanometers and unconstrained lengths, exhibiting quantized electrical conductance.
Core-shell nanoparticles consist of an inner core material encapsulated by an outer shell layer, enabling multifunctional combinations like magnetic targeting and fluorescent imaging.
Magnetic nanoparticles (such as iron oxide, $Fe_3O_4$ ) are used in magnetic hyperthermia cancer therapy, heating and destroying malignant tumor cells under alternating magnetic fields.
Superparamagnetism is a phenomenon in ferromagnetic nanoparticles below a critical diameter (typically < 20 nm) where magnetic orientation flips randomly under thermal fluctuations.
Bottom-up nanofabrication builds nanostructures atom-by-atom or molecule-by-molecule through chemical vapor deposition (CVD), sol-gel processes, and molecular self-assembly.
Top-down nanofabrication carves nanoscale features out of bulk materials using techniques such as photolithography, electron-beam lithography, and focused ion beam (FIB) milling.
Atomic Layer Deposition (ALD) is a gas-phase thin-film deposition technique based on sequential, self-limiting chemical surface reactions that deposits conformal monolayers with atomic precision.
Nano-hydroxyapatite ( $nHAp$ ) nanoparticles mimic natural bone mineral composition, promoting osteointegration in dental implants and synthetic bone graft matrices.
Carbon dots (CDs) are fluorescent zero-dimensional carbon nanoparticles (< 10 nm) with high biocompatibility, low toxicity, and tunable photoluminescence for bioimaging.
MXenes are a class of two-dimensional transition metal carbides, nitrides, and carbonitrides exhibiting metallic electrical conductivity and hydrophilic surfaces for energy storage.
Perovskite nanocrystals, characterized by the $ABX_3$ crystal structure, have demonstrated high power conversion efficiencies exceeding 25% in next-generation thin-film solar cells.
Nano-emulsions are kinetically stable colloidal dispersions of oil and water with droplet sizes between 20 and 200 nm, enhancing the bioavailability of lipophilic drugs.
Solid lipid nanoparticles (SLNs) and nanostructured lipid carriers (NLCs) are submicron colloidal carriers used in pharmaceutical cosmetics and topical drug delivery.
Electrospinning is a versatile nanofiber fabrication technique that uses high-voltage electrostatic fields to draw continuous polymer fibers with diameters in the nanometer range.
Plasmonic photothermal therapy (PPTT) uses gold nanorods tuned to absorb near-infrared (NIR) light, generating localized heat that selectively destroys cancerous tissues.
Nanotoxicology investigates the adverse biological effects, cellular uptake, and environmental bioaccumulation of engineered nanomaterials.
The National Institute of Nanotechnology (NINT) and specialized CeNS (Centre for Nano and Soft Matter Sciences) in Bengaluru conduct advanced nanoscience research in India.
Nano-coatings on architectural glass incorporate photocatalytic titanium dioxide ( $TiO_2$ ) that decomposes organic grime under sunlight, maintaining self-cleaning window surfaces.

Curriculum & Reference Sources: Department of Science and Technology (DST India), National Nanotechnology Initiative (NNI), Nature Nanotechnology

Sample Solved Questions & Concept Explanations

8 Verified Concept Questions

Q1.EASY

What unit of length corresponds to one-billionth of a meter (10^-9 m) in nanotechnology?

Q2.EASY

What allotrope of carbon consists of a single layer of carbon atoms arranged in a two-dimensional hexagonal lattice?

Q3.EASY

What is the primary material used as a semiconductor in computer microprocessors and integrated circuits?

Q4.EASY

What is a 'Fullerene' (Buckyball, C60) in carbon nanomaterials?

Q5.MEDIUM

In semiconductor fabrication, what does 'EUV Lithography' stand for, used by ASML to print sub-3nm microchips?

Q6.MEDIUM

Which material exhibits zero electrical resistance and expels magnetic flux fields (Meissner Effect) below a critical temperature?

Q7.MEDIUM

What is 'Carbon Nanotube' (CNT) in nanotechnology?

Q8.HARD

In semiconductor physics, what is the 'Quantum Tunneling' leakage effect that limits classical silicon MOSFET transistor scaling below 3nm?