Nanotechnology Course

Master Nanotechnology
from fundamentals to applications

Complete revision — 5 chapters + 90 MCQs — Bilingual Arabic / English

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Nanotechnology Revision Guide · HIET El-Mahalla · 2025/2026
Chapter 1

Introduction & Fundamental Concepts

Nanomaterials definition · dimensionality · quantum confinement

🔬 Definition of Nanomaterials

Materials with at least one dimension in 1–100 nm. Unique properties arise from increased surface-to-volume ratio and quantum confinement effects.

  • Increased chemical reactivity (high surface-to-volume ratio)
  • Unique optical & electronic effects (quantum confinement)
  • Enhanced mechanical, thermal, and electrical properties
Dimensionality Classification
TypeConfined DimsFree DimsExamples
0D30Quantum Dots (CdSe, PbS)
1D21Nanowires, CNTs, ZnO
2D12Graphene, MoS₂, Thin films
3D03Porous nanostructures
Chemical Composition
Metallic: Au, Ag, CuInsulating: SiO₂, Al₂O₃Semiconducting: CdSe, ZnO, TiO₂Carbon-based: Graphene, CNTsComposite
⚡ Quantum Confinement Theory

When particle size < electron's de Broglie wavelength (λ = h/mv), energy levels become discrete instead of continuous.

  • Band gap increases as size decreases
  • Blue shift in absorption spectrum
  • Enhanced photoluminescence efficiency (used in QLED)
  • Improved catalytic activity (higher DOS)
StructureConfinedFreeExample
Quantum Wells (2D)12MoS₂, Thin films
Quantum Wires (1D)21ZnO Nanowires
Quantum Dots (0D)30CdSe, PbS
Chapter 2

Fabrication Techniques

Ball Milling · PVD (5 methods) · Laser Pyrolysis

🔄 Two Fundamental Approaches
Top-Down ↓
Breaks bulk → nano. E.g. Ball Milling, Sputtering.
Bottom-Up ↑
Atoms → nano. E.g. PLD, Laser Pyrolysis, Thermal Evaporation.
Fabrication Methods Comparison
MethodApproachCostPrecisionBest For
Chapter 3

Spectroscopic Characterization

UV-Vis · FTIR · XRD

UV-Vis Spectroscopy▼

Principle: Measures absorption of UV and visible light. Primary use: band gap determination of nanomaterials.

Beer-Lambert Law: A = εcl = log(I₀/I)

  • Determining optical band gap of nanomaterials
  • Studying electron transitions between energy levels
  • Analyzing quantum dots & gold/silver NPs (plasmonic resonance)
  • Blue shift → smaller particle → larger band gap
✓ Fast & non-destructive✗ No atomic structure info
FTIR Spectroscopy▼

Principle: Detects chemical bonds and functional groups via infrared absorption. H-bonding → peaks shift to lower wavenumbers (red shift / broadening).

Wavenumber (cm⁻¹)Bond / Group
3500–3200O-H, N-H Stretch
3000–2850C-H Stretch
2500–2000Triple bonds (Nitriles, Carbenes)
1850–1600C=O, C=C, C=N double bonds
1500–500Fingerprint Region (C-O, C-N, C-C)
✓ No extensive sample prep✗ Complex spectra
X-ray Diffraction (XRD)▼

Principle: Analytical technique to study crystalline structure, identify phases, and measure crystallite size.

Bragg's Law: nλ = 2d sinθ

Scherrer Equation: D = Kλ / β cosθ   (K ≈ 0.9, β = FWHM in radians)

  • Crystal structure analysis (cubic, hexagonal, tetragonal…)
  • Crystallite size calculation using Scherrer equation
  • Phase identification via XRD databases
  • Lattice strain & crystal defect analysis
  • Cannot analyze amorphous materials well
✓ Non-destructive✗ Low sensitivity to amorphous
Chapter 4

Microscopic Characterization

SEM · TEM · AFM — principles and full comparison

SEM vs TEM vs AFM — Full Comparison
Criteria 🔍 SEM 🔬 TEM 📡 AFM
Full Name Scanning Electron Microscope
المجهر الإلكتروني الماسح		 Transmission Electron Microscope
المجهر الإلكتروني النافذ		 Atomic Force Microscope
مجهر القوة الذرية
Image Type 3D surface image
ثلاثية الأبعاد لسطح العينة		 2D internal structure image
ثنائية الأبعاد للتركيب الداخلي		 3D topographic map
خريطة طبوغرافية ثلاثية الأبعاد
Information Surface morphology & shape Internal structure, crystallinity & defects Surface roughness & nano properties
Resolution ~1–10 nm ~0.1 nm (atomic level) ~0.1 nm
Cost High — مرتفعة Very High — مرتفعة جداً Lower — أقل من SEM & TEM
Sample Prep Simple — coating required for non-conductors (gold or carbon) Very complex — must be ultra-thin (<100 nm) Simple — no special preparation needed
Electron Source Uses focused electron beam to scan surface Uses high-energy electron beam transmitted through sample No electrons — uses tip-surface interaction forces (cantilever)
Vacuum ✓ Required ✓ Required ✗ Not required
Coating ✓ Required for non-conductive samples ✗ Not needed ✗ Not needed
✅ Advantages ✓ High-resolution 3D images (~1–10 nm)
✓ Analyzes surface morphology, shape & nanostructure
✓ Works on conductive & non-conductive materials (after coating) 		✓ Ultra-high resolution (~0.1 nm) — atomic level
✓ Internal crystalline structure
✓ Detects crystal defects & elemental distribution 		✓ High resolution (~0.1 nm)
✓ Works on insulators without coating
✓ No vacuum environment needed
❌ Disadvantages ✗ Non-conductive samples need coating (Au or C)
✗ High-energy may damage delicate samples 		✗ Ultra-thin sample prep required (<100 nm)
✗ Complex, expensive, needs vacuum
✗ High-energy may damage sensitive samples 		✗ Scanning is slow compared to SEM
✗ Tip-surface forces can affect image accuracy
🔬 Applications • Nanoparticle morphology & shapes
• Electronics & semiconductors
• Biosensors & nanocoatings 		• Carbon nanotubes at atomic level
• Advanced semiconductor materials
• Crystal defects in solar cell materials 		• Nanostructure & biological surfaces
• Mechanical & electrical properties
• Surface roughness of thin films & sensors
Best For Surface morphology, shape & nanostructures Atomic-level internal structure & crystal defects Surface roughness & biological samples
🔍 SEM — Scanning Electron Microscopy

Focused electron beam scans sample surface → emits secondary electrons (surface topography) and backscattered electrons (compositional info).

✓ 3D surface image ✓ High resolution 1–10 nm ✗ Requires vacuum ✗ Insulators need coating
🔬 TEM — Transmission Electron Microscopy

Electrons transmitted through ultra-thin sample (<100 nm) → atomic-level imaging (~0.1 nm). Reveals internal crystalline structure, defects, and elemental distribution.

✓ Atomic resolution ~0.1 nm ✓ Internal structure ✗ Very complex sample prep ✗ Very expensive
📡 AFM — Atomic Force Microscopy

Ultra-sensitive cantilever probe scans surface → tip-surface interaction causes bending → converted to 3D topographic image. Works on any material without coating or vacuum.

✓ No vacuum needed ✓ No coating needed ✗ Slower than SEM ✗ Tip forces affect accuracy
UV-Vis vs FTIR — Comparison
Criteria UV-Vis Spectroscopy FTIR Spectroscopy
Principle Measures absorption of UV and visible light by material Measures absorption of infrared light by chemical bonds
Speciality Optical absorption (Band Gap, SPR) Chemical bonds & functional groups
Analysis Speed Fast — very fast Fast — but needs interpretation
Main Use Studying optical & electronic properties Identifying chemical composition
Main Limitation No direct info about chemical bonds Does not give detailed info about optical properties
Chapter 5

Applications of Nanotechnology

Energy · Environment · Medicine · Smart Textiles · Quantum Dots · MOFs · Hydrothermal

🧪 Hydrothermal Synthesis
Hydrothermal (Traditional)

Bottom-up chemical method: reactions in aqueous solution at high temperature (100–300°C) and high pressure inside a sealed autoclave. Produces ZnO, TiO₂, Fe₃O₄ with precise size and shape control.

⚡ Microwave-Assisted Hydrothermal

Combines hydrothermal conditions with microwave heating inside a sealed pressurized vessel — instead of conventional oven heating.

Advantages
  • Faster reactions (hours → minutes)
  • Uniform volumetric heating
  • Monodisperse particle size distribution
  • Precise control of crystal shape
Applications
  • ZnO, TiO₂, Fe₃O₄ nanoparticles
  • Metal-organic frameworks (MOFs)
  • Biomedical nanoparticles
  • Photocatalysts
💡 Quantum Dots
What are Quantum Dots?

0D semiconductor nanocrystals (2–10 nm). Due to quantum confinement, size controls the emitted color:

🔵
2–3 nm
Blue light
🟢
3–5 nm
Green light
🔴
6–8 nm
Red light

Examples: CdSe, CdS, CdTe (cadmium-based) · PbS, PbSe (lead-based) · InP, ZnSe (heavy-metal-free)

QLED Displays — How it works
💡
Step 1
Blue LED backlight emits blue photons
🎯
Step 2
QD Film absorbs blue light
🌈
Step 3
Re-emits precise RGB colors by QD size
🖥️
Result
Wide Color Gamut + High brightness
Narrow emission spectrum Size-tunable color >90% DCI-P3 coverage High efficiency
Quantum Dots Applications
🖥️
QLED Displays
High-resolution screens, TVs, monitors
☀️
Solar Cells (QDSC)
Tunable band gap for higher efficiency
🔬
Bio-imaging
High-resolution fluorescence medical imaging
🎯
Drug Delivery
Targeted therapy tracking
🔦
LED Lighting
White LEDs, display backlights
📡
Sensors
Highly sensitive biosensors
🔷 Metal-Organic Frameworks (MOFs)
What are MOFs?

Porous crystalline materials made of metal ions/clusters connected by organic ligands (linkers). They form a 3D cage-like network with extremely high surface area (up to 7000 m²/g).

Key Properties
  • Extremely high surface area (up to 7000 m²/g)
  • Tunable pore size (2–100 Å)
  • Highly ordered crystalline structure
  • Multifunctional — optical, magnetic, catalytic
Structure
  • Metal nodes: Zn, Cu, Fe, Zr, Al
  • Organic linkers: carboxylates, imidazolates
  • Examples: MOF-5, ZIF-8, HKUST-1, MIL-101
MOFs Applications
🔋
Gas Storage
H₂ and CO₂ capture and storage
💊
Drug Delivery
Controlled release of therapeutic agents
🌿
Catalysis
High surface area for catalytic reactions
🌊
Water Treatment
Heavy metal and pollutant removal
📡
Sensing
Chemical and biological sensors
☀️
Energy Storage
Supercapacitors and batteries
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