研究目的
Investigating the structural and magnetic behaviors of Tb doped ZnO nanorods synthesized by hydrothermal method, focusing on defects and their correlation with doping concentration.
研究成果
Tb doped ZnO nanorods were successfully synthesized with single-phase wurtzite structure. Doping increases oxygen vacancies, as indicated by ESR intensity and line-width changes, which act as paramagnetic centers. The structural parameters vary with doping concentration, and nanorod sizes decrease with increased doping. The main ESR peak is attributed to oxygen vacancies, not Tb ions directly.
研究不足
The study is limited to room temperature measurements and specific doping concentrations (x=0.0 to 0.05). The ESR signals for undoped samples were weak and noisy, and the origin of minor peaks in ESR spectra was not fully resolved. The sample purity may include unavoidable impurities affecting results.
1：Experimental Design and Method Selection:
The study used hydrothermal synthesis to prepare Zn1?xTbxO nanorods with varying Tb concentrations (x=
2：0 to 05). Structural analysis was performed using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier-transform infrared spectroscopy (FTIR). Magnetic properties were studied using electron spin resonance (ESR) spectroscopy. Sample Selection and Data Sources:
Samples were synthesized using zinc nitrate, terbium acetate tetrahydrate, and hexamethylenetetramine (HMTA) as precursors in deionized water. Concentrations ranged from x=
3：0 to 05 in 01 increments. List of Experimental Equipment and Materials:
Equipment included Rigaku Multiflex XRD instrument, Jeol-6390-LV SEM-EDX, Perkin Elmer Spectrum Two FTIR-ATR spectrophotometer, and Bruker EMX X-band ESR spectrometer. Materials included Zn(NO3)2 (Alfa Aesar), terbium acetate tetrahydrate, HMTA, and deionized water.
4：Experimental Procedures and Operational Workflow:
Precursor solutions were prepared, stirred, transferred to autoclaves, and heated at 100°C. Nanorods were separated by centrifugation, washed, and dried. XRD, SEM, FTIR, and ESR measurements were conducted at room temperature.
5：Data Analysis Methods:
XRD data were analyzed using Debye-Scherrer equation for size calculation, lattice parameters, microstrain, stress, dislocation density, and bond length. ESR spectra were analyzed for g-factor and line-width dependence on concentration.
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