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Synthesis and Catalytic Performance of Gold Intercalated in the Walls of Mesoporous Silica
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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
PubMed
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.

Keywords:
2Dcatalysisgold nanomaterialsnanoenzymessub‐nanometer

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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.