研究目的
Investigating the optimization of the pulsed laser deposition process for the generation of hydroxyapatite thin films and understanding the dynamics of laser produced plasma.
研究成果
The study successfully optimized the PLD process for hydroxyapatite thin films, revealing plasma structuring into three components with distinct kinetics. The fractal model provided insights into the distribution of excited states in the plasma. Optimal deposition conditions were identified at a fluence of 2.5 J/cm^2 for stoichiometric films.
研究不足
The study was conducted under specific experimental conditions (low pressure, specific laser parameters), which may limit the generalizability of the findings. The fractal model's applicability to other materials or conditions was not explored.
1：Experimental Design and Method Selection
The study utilized pulsed laser deposition (PLD) with an Nd:YAG laser to generate plasma on a hydroxyapatite target. The process was monitored using an ICCD fast gated camera and a high-resolution spectrometer for optical emission spectroscopy.
2：Sample Selection and Data Sources
A disk-shaped hydroxyapatite target (1 cm in diameter) was used. The experiments were performed at a background pressure of 10^-2 Torr.
3：List of Experimental Equipment and Materials
Nd:YAG laser (10 ns, 10 Hz, 532 nm), ICCD fast gated camera, high-resolution spectrometer, Park NX10 equipment for AFM, SEM VegaTescan LMH II for SEM, Bruker equipment for EDS.
4：Experimental Procedures and Operational Workflow
The target was irradiated with laser pulses of 80 mJ and 40 mJ energy per pulse. The plasma dynamics were monitored using ICCD imaging and optical emission spectroscopy. AFM and SEM were used to analyze the deposited films.
5：Data Analysis Methods
Optical emission spectra were analyzed to identify species present in the plasma. The Boltzmann method was used to determine excitation temperatures. AFM and SEM images were analyzed for surface morphology and composition.
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