Related Experiment Video
Updated: Jan 24, 2026
13:42
Gold Nanoparticle Synthesis
Published on: July 10, 2021
15.8K
Directing Gold Nanoparticles into Free-Standing Honeycomb-Like Ordered Mesoporous Superstructures
Xiaotong Wu1,2, Jinping Chen3, Lin Xie4
1Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong, 518055, China.
Small (Weinheim an Der Bergstrasse, Germany)
|May 24, 2019
Summary
Researchers developed a novel method to create 2D mesoporous gold (Au) superstructures with a honeycomb pattern. These stable, free-standing materials exhibit enhanced electric fields for nano-plasmonic applications.
Area of Science:
- Materials Science
- Nanotechnology
- Plasmonics
Background:
- 2D mesoporous materials combine nanoparticle properties with collective interactions.
- Ordered nanostructures are crucial for advanced material functionalities.
Purpose of the Study:
- To develop a facile and designable method for fabricating free-standing 2D mesoporous gold (Au) superstructures.
- To investigate the structural and optical properties of these novel Au superstructures.
Main Methods:
- Assembly of 5.0 nm gold nanoparticles (Au NPs) into a superlattice film on a diethylene glycol substrate.
- Thermal treatment at 180 °C to induce nanoparticle attachment and form honeycomb structures.
- Characterization using electron energy-loss spectroscopy and 3D finite-difference time-domain simulations.
Main Results:
- Fabrication of free-standing 2D mesoporous Au superstructures with a honeycomb-like configuration.
- Formation of ordered mesopores (3.5 nm) in a hexagonal array, stabilized by metallic bonding.
- Observation of electric field enhancement at mesopores upon optical excitation, confirmed by experiments and simulations.
Conclusions:
- The developed method provides a stable and transferable 2D mesoporous Au superstructure.
- These materials demonstrate significant potential for nano-plasmonic applications due to their unique optical properties.
Related Concept Videos
01:17Standing Waves
5.3K
Sometimes waves do not seem to move; rather, they just vibrate in place. Unmoving waves can be seen on the surface of a glass of milk kept in a refrigerator, which is one example of standing waves. Vibrations from the refrigerator motor create waves on the milk that oscillate up and down but do not seem to move across the surface. These waves are formed or created by the superposition of two or more identical moving waves in opposite directions. The waves move through each other, with their...
5.3K
01:15Standing Electromagnetic Waves
2.3K
Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
2.3K
01:28Standing Waves in a Cavity
1.4K
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.4K
01:04Modes of Standing Waves: II
1.6K
The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end....
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end....
1.6K
01:03Modes of Standing Waves - I
4.0K
A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This...
4.0K
01:09Directing Effect of Substituents: meta-Directing Groups
5.8K
Substituents on the benzene ring that direct an incoming electrophile to undergo substitution at the meta position are called meta directors. All meta directors either have a positive charge on the atom directly bonded to the ring or a partial positive charge. These groups function by withdrawing electrons from the ring through inductive and resonance effects. Consider the carbocation intermediates formed upon the addition of an electrophile on nitrobenzene at the...
5.8K