研究目的
Investigating the nonlinear optical and optical power limiting properties of Zn1-xMnxO thin films prepared by spray pyrolysis with low precursor concentration, and correlating these properties with structural and surface morphology changes due to Mn doping.
研究成果
The Zn1-xMnxO thin films exhibit polycrystalline hexagonal structure with morphological changes from fibrous to spherical upon Mn doping. XPS confirms Mn2+ state, and optical band gap decreases due to sp-d exchange interactions. Nonlinear optical studies show RSA behavior attributed to TPA, with enhanced nonlinearity in doped films. Optical limiting properties indicate potential applications as limiters in the visible region, with limiting thresholds influenced by doping concentration.
研究不足
The study is limited to thin films prepared by spray pyrolysis with specific parameters; results may vary with other deposition methods or conditions. The use of CW laser might introduce thermal effects, and the findings are specific to the visible region (532 nm). Potential optimizations include exploring other doping levels, laser types, or substrate materials.
1：Experimental Design and Method Selection:
The study used spray pyrolysis for film deposition, with characterization via XRD, SEM, XPS, UV-VIS spectrophotometry, and z-scan technique to analyze structural, morphological, compositional, optical, and nonlinear optical properties. The z-scan method was chosen to measure nonlinear absorption and refraction coefficients under CW laser illumination.
2：Sample Selection and Data Sources:
Zn1-xMnxO thin films with x=0 to 0.1 were deposited on borosilicate glass substrates. Samples were prepared using aqueous precursor solutions of 0.0125 M concentration with zinc acetate and manganese acetate as sources.
3：1 were deposited on borosilicate glass substrates. Samples were prepared using aqueous precursor solutions of 0125 M concentration with zinc acetate and manganese acetate as sources.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes spray pyrolysis unit, DektakXT surface profile measuring system (Bruker model DXT-18-1715), SEM (Zeiss EVO 18-15-57), UV-VIS spectrophotometer (Shimadzu -1800), XPS (Omicron energy analyzer EA-125), and z-scan setup with CW DPSS laser at 532 nm. Materials include glass substrates, zinc acetate dihydrate, manganese acetate tetrahydrate, and compressor air.
4：Experimental Procedures and Operational Workflow:
Films were deposited at 723 K with a flow rate of 2 ml/min and air pressure of 5 kgf/cm2. Thickness was controlled to 550-600 nm. Characterization involved measuring thickness, surface morphology, optical transmittance, composition, and nonlinear optical parameters using z-scan with a laser power of 200 mW and wavelength of 532 nm.
5：Data Analysis Methods:
Data were analyzed using Scherrer's formula for crystallite size, Tauc's relation for band gap, and equations for nonlinear absorption coefficient and third-order susceptibility from z-scan curves. Statistical comparisons were made with literature values.
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