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Hydrophobic CuO Nanosheets Functionalized with Organic Adsorbates.
Yulian He1, Zachary S Fishman1, Ke R Yang2,3
1Department of Chemical & Environmental Engineering, Yale University , New Haven, Connecticut 06520-8286, United States.
Journal of the American Chemical Society
|January 4, 2018
Summary
Researchers created hydrophobic copper oxide (CuO) nanosheets by adding organic molecules. These functionalized nanosheets show tunable water repellency, with stability linked to their surface chemistry.
Area of Science:
- Materials Science
- Surface Chemistry
- Nanotechnology
Background:
- Copper oxide (CuO) is a widely studied material with diverse applications.
- Controlling the surface properties of CuO nanosheets is crucial for advanced applications.
- Hydrophobicity is a key surface characteristic influencing material interactions.
Purpose of the Study:
- To introduce a novel class of hydrophobic CuO nanosheets.
- To investigate the effect of organic functionalization on CuO nanosheet hydrophobicity.
- To establish a correlation between surface chemistry and hydrophobicity stability.
Main Methods:
- Functionalization of CuO nanosheets with aromatic and aliphatic organic molecules.
- Contact angle measurements to quantify hydrophobicity.
- X-ray Photoelectron Spectroscopy (XPS) and Attenuated Total Reflectance Fourier-Transform Infrared (ATR-FTIR) spectroscopy for surface analysis.
- Density Functional Theory (DFT) calculations and 1H NMR spectroscopy for mechanistic insights.
- H2 temperature-programmed reduction (H2-TPR) for stability assessment.
Main Results:
- Hydrophobic CuO nanosheets were successfully synthesized via functionalization.
- Contact angles varied significantly (27° to 146°) based on the functionalizing agent.
- Aromatic adsorbates demonstrated thermal stability up to 250-350 °C due to covalent alkoxide bonding.
- Hydrophobicity showed a strong correlation with H2-TPR stability.
Conclusions:
- Surface functionalization offers a versatile route to tune CuO nanosheet hydrophobicity.
- The covalent binding of adsorbates enhances thermal stability.
- H2-TPR serves as a practical indicator for assessing the hydrophobicity of functionalized CuO nanosheets.
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