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Photo-assisted epitaxial growth from nanoparticles to enhance multi-materialization for advanced surface
Masayuki Fukuda1, Yuuki Kitanaka1, Tomohiko Nakajima1
1Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan. m-fukuda@aist.go.jp.
Achieving epitaxial growth in hybrid-solution-incorporated photo-assisted chemical solution deposition (HS-PCSD) requires laser intensity exceeding a threshold. This method enables controlled ceramic thin film growth by understanding photocrystallization mechanisms.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Freeform objects require advanced materials, driving the need for low-temperature ceramic deposition for surface functionalization.
- Photo-assisted chemical solution deposition (PCSD) offers efficient low-temperature ceramic thin film fabrication via photochemical and photothermal effects.
- Hybrid-solution-incorporated PCSD (HS-PCSD) enables deposition at reduced temperatures and accelerated rates, but crystal growth mechanisms are underexplored.
Purpose of the Study:
- To quantitatively evaluate the photocrystallization processes in ceramic thin films fabricated using HS-PCSD under varied conditions.
- To elucidate the critical factors influencing epitaxial growth versus crystal nucleation in HS-PCSD.
- To understand the particle growth mechanisms during photocrystallization in HS-PCSD.
Main Methods:
- Fabrication of ceramic thin films using hybrid-solution-incorporated photo-assisted chemical solution deposition (HS-PCSD).
- Quantitative evaluation of photocrystallization under various HS-PCSD conditions.
- Analysis of laser intensity effects on crystal growth dynamics.
Main Results:
- Laser intensity at the reaction interface must surpass a threshold for epitaxial growth, driven by dangling bond photoactivation and photothermal atomic migration.
- Epitaxial growth competes effectively with crystal nucleation growth when laser intensity exceeds the determined threshold.
- Particle growth during photocrystallization is attributed to amorphous-phase crystallization, not grain boundary migration.
Conclusions:
- Insights into achieving true multi-materialization with desirable physical properties in HS-PCSD were obtained through quantitative analysis.
- Understanding the critical laser intensity threshold is key for controlling epitaxial growth in HS-PCSD.
- The study clarifies particle growth mechanisms, paving the way for optimized ceramic thin film design.
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