1 / 7

Bottom_Up_Approaches_to_Nanomaterials_Synthesis

ppt on Bottom_Up_Approaches_to_Nanomaterials_Synthesis

Cornelius13
Télécharger la présentation

Bottom_Up_Approaches_to_Nanomaterials_Synthesis

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Bottom-Up Approaches to Nanomaterials Synthesis • Presented by: Cornelius Mensah • Institution: Alpha Beta Christian College / KNUST • Date: November 2025

  2. Introduction • • Nanomaterials: materials with at least one dimension between 1–100 nm. • • Two synthesis approaches: Top-down and Bottom-up. • • Bottom-up builds structures atom-by-atom or molecule-by-molecule. • • Provides precise control over composition and structure.

  3. Principles and Key Techniques • • Based on self-organization, thermodynamic and kinetic control. • • Techniques include: • - Sol-Gel Method • - Co-precipitation • - Hydrothermal/Solvothermal • - Chemical Vapor Deposition (CVD) • - Biological (Green) Synthesis • - Molecular Self-Assembly

  4. Selected Methods Overview • 1. Sol-Gel Method: hydrolysis and condensation to form metal oxides (e.g., TiO₂). • 2. Co-precipitation: simultaneous ion precipitation (e.g., Fe₃O₄ nanoparticles). • 3. Hydrothermal/Solvothermal: high temperature and pressure synthesis. • 4. CVD: gas-phase reaction to deposit thin films or nanotubes. • 5. Green Synthesis: eco-friendly synthesis using plants or microbes.

  5. Advantages and Limitations • Advantages: • • High purity and uniformity. • • Atomic-level control of composition. • • Cost-effective and energy-efficient. • Limitations: • • Difficult to scale up. • • Agglomeration of nanoparticles. • • Reaction control required.

  6. Applications • • Electronics: nanotransistors, semiconductors, sensors. • • Medicine: drug delivery, imaging agents. • • Energy: solar cells, fuel cells, catalysts. • • Environment: pollutant degradation, water purification. • Comparison with Top-Down: • • Bottom-up: builds from atoms/molecules, high precision. • • Top-down: breaks bulk material, may introduce defects.

  7. References • 1. Poole & Owens (2003). Introduction to Nanotechnology. • 2. Cao (2004). Nanostructures and Nanomaterials: Synthesis, Properties, and Applications. • 3. Khan, M.I. et al. (2022). Green Synthesis of Nanoparticles and Their Applications. • 4. Elsevier & ACS Publications.

More Related