Related Experiment Video
Updated: Jan 3, 2026
11:02
Synthesis and Catalytic Performance of Gold Intercalated in the Walls of Mesoporous Silica
Published on: July 9, 2015
10.5K
Sub-Nanometer Thick Gold Nanosheets as Highly Efficient Catalysts
Sunjie Ye1,2, Andy P Brown3, Ashley C Stammers1
1School of Physics and Astronomy University of Leeds Leeds LS2 9JT UK.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|November 16, 2019
Summary
Researchers developed a novel method for synthesizing atomically-thin, two-dimensional (2D) gold nanosheets in water at room temperature. These ultrathin gold nanomaterials exhibit exceptional catalytic and peroxidase-mimicking activities for sensitive hydrogen peroxide detection.
Area of Science:
- Materials Science
- Nanotechnology
- Chemistry
Background:
- Two-dimensional (2D) metal nanomaterials offer unique properties but their synthesis, especially in ambient aqueous conditions, is challenging.
- Atomically-thin 2D metallic nanomaterials are particularly difficult to achieve.
Purpose of the Study:
- To develop a facile, one-step aqueous synthesis for freestanding, atomically-thin 2D gold nanosheets.
- To investigate the catalytic and sensing applications of these novel gold nanomaterials.
Main Methods:
- A one-step aqueous synthesis at 20 °C using methyl orange as a confining agent.
- Characterization of the synthesized gold nanosheets for thickness and morphology.
- Evaluation of catalytic activity in 4-nitrophenol reduction and peroxidase-mimicking activity for H2O2 sensing.
Main Results:
- Successfully synthesized freestanding gold nanosheets with a thickness of 0.47 nm (two atomic layers).
- Demonstrated excellent catalytic performance in 4-nitrophenol reduction due to high surface area and exposed unsaturated atoms.
- Achieved highly sensitive colorimetric sensing of hydrogen peroxide (H2O2) with a detection limit of 0.11 × 10⁻⁶ M, owing to peroxidase-mimicking activity.
Conclusions:
- This work presents the first fabrication of freestanding 2D gold with sub-nanometer thickness.
- The developed method offers an innovative pathway for synthesizing atomically-thin metal nanomaterials.
- The ultrathin gold nanosheets show significant potential for catalysis and highly sensitive biosensing applications.
