Table of contents

Introduction to Nanotechnology

Properties of Silver Nanoparticles

Laser Ablation Technique

Experimental Setup for Nanoparticle Synthesis

Preparation of Silver Nanoparticles

Absorbance Spectra Analysis

Transmittance Spectra Analysis

Effects of Laser Energy on Nanoparticle Forma…

Conclusion and Future Directions

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Introduction to Nanotechnology

Exploring Nanotechnology: Synthesis and Characterization of Silver Nanoparticles

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Nanotechnology can lead to more efficient solar collectors.

It contributes to the development of advanced materials for energy applications.

Advancements in Solar Energy

Nanotechnology plays a significant role in the treatment of many diseases, particularly in cancer research.

Silver nanoparticles have been widely used in various applications, such as biomedicine and biosensors.

Nanotechnology in Medicine

Nanotechnology is an important field of modern research dealing with design, synthesis, and manipulation of particles structure ranging from approximately 1-100 nm.

Tremendous growth in this emerging technology has opened novel fundamental and applied frontiers.

Overview of Nanotechnology

Properties of Silver Nanoparticles

Exploring Nanotechnology: Synthesis and Characterization of Silver Nanoparticles

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Industrial Applications

Silver nanoparticles are widely used in antimicrobial coatings for textiles and medical devices.

They are also incorporated into biosensors and catalysis, leveraging their unique physicochemical properties.

Thermal Properties

Silver nanoparticles demonstrate excellent thermal conductivity, which is beneficial in applications requiring efficient heat transfer.

Their thermal properties contribute to their effectiveness in antimicrobial coatings and biomedical devices.

Electrical Properties

Silver nanoparticles possess significant electrical conductivity, making them suitable for various electronic applications.

Their unique electronic properties enable their use in biosensors and other detection devices.

Optical Properties

Silver nanoparticles exhibit unique optical properties, characterized by an absorption spectrum centered around 400 nm.

They are noted for their pale yellow color, indicating the presence of nanoparticles in solution.

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Laser Ablation Technique

Exploring Nanotechnology: Synthesis and Characterization of Silver Nanoparticles

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When the laser pulse hits the silver surface in water, it creates a spark and the target material absorbs the laser energy.

Laser Pulse Interaction

This energy generates heat waves, producing two shock waves: one within the target and another in the liquid.

Shock Wave Generation

The spark forms an invisible cloud of silver nanoparticles, causing the liquid to change color to yellow, indicating their presence.

Nanoparticle Formation

Experimental Setup for Nanoparticle Synthesis

Exploring Nanotechnology: Synthesis and Characterization of Silver Nanoparticles

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Nd-YAG Laser

The Nd-YAG laser beam focused by using lenses above the target metal.

Quartz Container

The target metallic silver was fixed by a holder at the bottom of a quartz container.

Silver Target

The target metallic silver (purity of 99.99%) was used for the ablation process.

Focusing Lenses

Lenses are used to focus the Nd-YAG laser beam onto the silver target.

Aqueous Solution

The silver target is submerged in water during the laser ablation process.

Exploring Nanotechnology: Synthesis and Characterization of Silver Nanoparticles

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Preparation of Silver Nanoparticles

Cutting Silver Plate

Cutting the silver plate to the required dimension (0.7 × 0.7 cm2).

Washing Procedure

Wash the silver plate with a 1:1 mixture of distilled and deionized water to remove impurities.

Polishing Surface

Polish the silver plate with 600-grade emery paper.

Laser Pulse Application

When the laser pulse reaches the silver surface submerged in water, a cloud spark with a strong shock wave is established.

Nanoparticle Formation

The liquid turns yellow, indicating the presence of silver nanoparticles, with increased absorbance intensity showing higher density.

Exploring Nanotechnology: Synthesis and Characterization of Silver Nanoparticles

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Absorbance Spectra Analysis

•The liquid color changes to yellow, indicating the presence of silver nanoparticles. This color change signifies an increase in the concentration of silver nanoparticles.

Nanoparticle Density Changes

•Increasing the number of laser pulses enhances the absorbance intensity. This suggests that more laser pulses lead to a greater concentration of nanoparticles in the solution.

Pulse Count Effects

Exploring Nanotechnology: Synthesis and Characterization of Silver Nanoparticles

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Transmittance Spectra Analysis

•Transmittance drops from 52.051% at 15 pulses to 45.215% at 45 pulses, illustrating the link between laser parameters and nanoparticle characteristics.

Transmittance Changes

•Increasing laser pulses decreases transmittance values, indicating a higher density of nanoparticles in the solution.

Pulse Count Effect

Effects of Laser Energy on Nanoparticle Formation

Exploring Nanotechnology: Synthesis and Characterization of Silver Nanoparticles

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The increase in laser energy affects the density and distribution of nanoparticles in the solution.

Higher energy levels contribute to the removal of larger material, impacting the overall distribution.

Distribution Characteristics

The absorption spectrum indicates that the nanoparticles in the solution are approximately 8 nm in size.

Particle Size Influence

Varying laser energy (600 mJ to 750 mJ) influences nanoparticle formation.

Higher energy levels lead to the generation of larger particles instead of nanoscale ones.

Laser Energy Variations

Exploring Nanotechnology: Synthesis and Characterization of Silver Nanoparticles

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Conclusion and Future Directions

Further studies could explore the effects of different laser parameters on nanoparticle characteristics. Additionally, applications of silver nanoparticles in various fields such as biomedicine and environmental science warrant investigation.

Future Research Directions

The absorption spectrum shows a quasi-symmetrical peak around 400 nm. This indicates that the nanoparticles are approximately 8 nm in size and have a pale yellow color.

Key Findings