研究目的
Investigating the local and controllable growth of nanocrystalline silicon (nano-Si) in commercial borosilicate glass via aluminothermic reaction initiated by CW low-power laser irradiation of aluminum nanodisks arrays.
研究成果
The study successfully demonstrated the local formation of nanocrystalline silicon in borosilicate glass via aluminothermic reaction initiated by thermoplasmonic heating of aluminum nanodisks arrays with low-power CW lasers. The conditions for nano-Si formation are determined by laser intensity and the proximity of the laser wavelength to the plasmon resonance of the metal structure. This approach offers a controllable method for nano-Si fabrication with potential applications in nanoelectronics and optoelectronics.
研究不足
The reproducibility of nano-Si formation across different Al nanodisks inside the array is affected by the uniformity of nanodisks' morphology and laser irradiation. The study is limited to low-power CW lasers and specific glass compositions.
1：Experimental Design and Method Selection:
The study involved the fabrication of 2D arrays of aluminum nanodisks on borosilicate glass and their irradiation with CW 633 and 532 nm lasers to initiate the aluminothermic reaction for nano-Si formation. The thermoplasmonic heating effect was investigated by varying the laser intensity and wavelength proximity to the plasmon resonance of the arrays.
2：Sample Selection and Data Sources:
Commercial borosilicate glass slides were used as substrates. Aluminum nanodisks arrays with varying diameters and periods were fabricated using standard electron beam lithography.
3：List of Experimental Equipment and Materials:
- Confocal Raman microscopes WITec Alpha 300R and LabRAM HR 800 for irradiation and Raman spectra measurement.
4：Experimental Procedures and Operational Workflow:
- Fabrication of Al nanodisks arrays on glass substrates.
5：Data Analysis Methods:
Raman scattering spectra were analyzed to identify nano-Si formation. The average size of silicon nanocrystals was estimated based on phonon frequency shifts. SEM and AFM images were used to assess morphological changes.
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