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A Simple Method for the Size Controlled Synthesis of Stable Oligomeric Clusters of Gold Nanoparticles under Ambient Conditions
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Simple Method for Controlling Gold Nanocluster Size in Mesoporous Silica: SBA-11.

Tariq Aqeel1, Ali Bumajdad2

  • 1Department of Science, College of Basic Education, The Public Authority for Applied Education and Training (PAAET), P.O. Box 23167, Safat 13092, Kuwait.

Molecules (Basel, Switzerland)
|May 14, 2025
PubMed
Summary

This study presents a facile method to control gold nanocluster size within mesoporous silica. Smaller, uniformly sized gold nanoclusters demonstrate enhanced photocatalytic activity for methylene blue degradation.

Keywords:
UV-visXPScontrolledgoldmesoporousmethylene bluenanoclustersphotocatalysissunlight

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Catalysis

Background:

  • Mesoporous silica hosts are valuable for incorporating functional nanomaterials.
  • Gold nanoclusters (Au NCs) exhibit unique optical and catalytic properties.
  • Controlling the size and distribution of Au NCs is crucial for optimizing their performance.

Purpose of the Study:

  • To develop a facile method for controlling the size distribution of Au nanoclusters within silica hosts.
  • To investigate the impact of Au nanocluster size on photocatalytic activity.

Main Methods:

  • Synthesis of Au nanoclusters within mesoporous silica using a reducing gas at controlled temperatures.
  • Characterization using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDX), UV-Vis spectroscopy, N2 sorption, and X-ray photoelectron spectroscopy (XPS).
  • Photocatalytic degradation of methylene blue (M.B.) under direct sunlight.

Main Results:

  • A method was established to achieve narrow (average 1.3 nm) or broad (1-2 nm inside pores, 5-30 nm outside) Au nanocluster size distributions.
  • The sample with uniformly sized 1.3 nm Au nanoclusters (1-Au-SBA-11) showed significantly higher methylene blue degradation efficiency.
  • 1-Au-SBA-11 degraded M.B. in 90 minutes, half the time of the broader distribution sample (2-Au-SBA-11).

Conclusions:

  • The size and distribution of Au nanoclusters within mesoporous silica can be effectively controlled.
  • Precisely controlled, smaller Au nanoclusters exhibit superior photocatalytic performance.
  • These findings suggest potential applications for tailored Au nanocluster-silica composites in various fields.