研究目的
To investigate the structural and electrical transport properties of PBMA nanocomposite with various loading of Nd-TiO2 nanoparticles, including AC conductivity, activation energy, and DC conductivity, and to correlate experimental results with theoretical models to understand the conducting mechanism.
研究成果
The research demonstrates that Nd-TiO2 nanoparticles enhance the electrical conductivity of PBMA nanocomposites through a hopping conduction mechanism, with optimal performance at 7 wt% loading. The Mamunya model best fits the experimental data, indicating strong interfacial interactions. Future studies could focus on other metal oxide dopants or applications in flexible electronics.
研究不足
The study may have limitations in the scalability of synthesis methods, potential agglomeration of nanoparticles at higher concentrations (e.g., 10 wt%), and the applicability of theoretical models only to specific composite systems. Optimization could involve exploring other dopants or polymerization techniques.
1：Experimental Design and Method Selection:
The study involved synthesizing PBMA/Nd-TiO2 nanocomposites via in situ free radical polymerization to ensure homogeneous dispersion. Electrical properties were analyzed using AC and DC conductivity measurements, and theoretical models (McCullough, Bueche, Scarisbrick, Mamunya) were applied to understand conductivity mechanisms.
2：Sample Selection and Data Sources:
Samples included pure PBMA and PBMA with 0, 3, 5, 7, and 10 wt% Nd-TiO2 nanoparticles. Data were sourced from laboratory synthesis and characterization.
3：List of Experimental Equipment and Materials:
Equipment included Rigaku Miniflex 600 diffractometer for XRD, Hitachi S-3000 H SEM, Hewlett Packard LCR meter (HP: 4284A) for AC conductivity, and Keithly 2400 instrument for DC conductivity. Materials included butyl methacrylate, titanium isopropoxide, neodymium oxide, toluene, AIBN, CTAB, nitric acid, and ethanol.
4：Experimental Procedures and Operational Workflow:
Nd-TiO2 nanoparticles were synthesized via sol-gel process. Nanocomposites were prepared by dispersing nanoparticles in toluene with CTAB, adding to monomer, polymerizing with AIBN at 85°C, and drying. Characterization involved XRD, SEM, and electrical measurements at various temperatures and frequencies.
5：Data Analysis Methods:
Data were analyzed using equations for conductivity (e.g., sac = e0 * er * ω * tanδ), activation energy from slopes of plots, and comparison with theoretical models for DC conductivity.
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