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A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates
Published on: May 9, 2014
Mechanical reinforcement of nanoparticle thin films using atomic layer deposition
Majemite I Dafinone1, Gang Feng, Teresa Brugarolas
1Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States.
ACS Nano
|May 12, 2011
Summary
Atomic layer deposition (ALD) significantly enhances the mechanical durability of titanium dioxide/silicon dioxide nanoparticle thin films (NTFs). This low-temperature method improves abrasion resistance without compromising essential optical and surface properties.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Chemistry
Background:
- Nanoparticle thin films (NTFs) offer synergistic properties for advanced applications.
- NTFs suffer from poor mechanical durability and abrasion resistance, limiting commercialization.
- High-temperature sintering improves durability on inorganic substrates but is unsuitable for organic materials.
Purpose of the Study:
- To investigate the use of atomic layer deposition (ALD) for enhancing the mechanical durability of TiO(2)/SiO(2) nanoparticle layer-by-layer (LbL) films.
- To assess the impact of ALD treatment on the structural, physical, and functional properties of NTFs.
- To compare the effectiveness of ALD with traditional high-temperature sintering methods.
Main Methods:
- Fabrication of TiO(2)/SiO(2) nanoparticle LbL films on glass and polycarbonate substrates.
- Atomic layer deposition (ALD) treatment at low temperatures.
- Characterization using spectroscopic ellipsometry, UV-vis spectroscopy, contact angle measurements, and nanoindentation.
- Abrasion testing to evaluate mechanical durability.
Main Results:
- ALD treatment drastically improved the mechanical durability and abrasion resistance of TiO(2)/SiO(2) NTFs.
- The robustness of ALD-treated films was comparable to thermally calcined films.
- ALD treatment preserved the superhydrophilicity and antireflection properties of the original films.
- Solution ellipsometry determined film composition and characteristic pore size as a function of ALD cycles.
Conclusions:
- Atomic layer deposition (ALD) is an effective low-temperature method for reinforcing nanoparticle thin films (NTFs).
- ALD enhances mechanical durability without sacrificing essential functionalities like superhydrophilicity and antireflection.
- This approach overcomes the limitations of high-temperature processing for NTFs on various substrates, including organic ones.
