Related Experiment Video
Updated: May 6, 2026
12:39
Gold Nanostar Synthesis with a Silver Seed Mediated Growth Method
Published on: January 15, 2012
25.3K
In Situ Second Harmonic Generation and Extinction Spectroscopy for Studying Colloidal Gold-Silver-Gold
Stena C Peterson1, Daniel A Babayode1, Christopher P Reso1
1Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States.
Summary
Researchers monitored gold-silver-gold core-shell-shell (Au-Ag-Au CSS) nanoparticle synthesis in real time. In situ spectroscopy revealed how nanoparticle morphology and smoothness evolve during growth.
Area of Science:
- Colloidal chemistry
- Nanoparticle synthesis
- Surface science
Background:
- Colloidal gold-silver-gold core-shell-shell (Au-Ag-Au CSS) nanoparticles are of interest for various applications.
- Understanding nanoparticle growth dynamics is crucial for controlling their properties.
Purpose of the Study:
- To monitor the real-time growth dynamics of Au-Ag-Au CSS nanoparticles.
- To investigate the evolution of nanoparticle morphology and surface properties during synthesis.
- To correlate spectroscopic signals with structural changes.
Main Methods:
- Time-dependent in situ second harmonic generation (SHG) spectroscopy
- Extinction spectroscopy
- Transmission electron microscopy (TEM)
- Mie theory calculations
Main Results:
- Stepwise synthesis resulted in progressively smoother and more uniform Au-Ag-Au CSS nanoparticles.
- SHG signal intensity correlated with surface roughness, increasing initially and then decreasing.
- Extinction spectra showed blue shifts and narrowing with increased size and smoothness.
- TEM confirmed the development of spherical concentric nanoarchitecture.
Conclusions:
- In situ SHG and extinction spectroscopy provide detailed insights into nanoparticle growth.
- The study successfully characterized the nanoscale evolution of Au-Ag-Au CSS nanoparticles.
- This combined approach is valuable for studying complex colloidal nanoparticle synthesis.
More Related Videos
08:19Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
Published on: March 2, 2016
18.4K
07:02Studying the Effects of Temperature on the Nucleation and Growth of Nanoparticles by Liquid-Cell Transmission Electron Microscopy
Published on: February 17, 2021
4.3K
Related Concept Videos
01:23Atomic Spectroscopy: Absorption, Emission, and Fluorescence
3.2K
Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
3.2K
01:13Atomic Absorption Spectroscopy: Radiation and Light Sources
1.7K
Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
1.7K
01:20Atomic Emission Spectroscopy: Overview
3.3K
Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
3.3K
01:22Atomic Emission Spectroscopy: Instrumentation
1.5K
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
1.5K
01:29Atomic Emission Spectroscopy: Lab
884
AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
884
01:29Atomic Fluorescence Spectroscopy
1.2K
Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
1.2K