Alizadeh Sajad, Fallah Narges, Nikazar Manochehr
Chemical Engineering Department, Amirkabir University of Technology P. O. Box: 15875-4413 Tehran Iran
RSC Adv. 2019 Feb 4;9(8):4314-4324. doi: 10.1039/c8ra10155h. eCollection 2019 Jan 30.
In this study, an ultrasonic method was utilized in combination with microemulsion to synthesize CdS/TiO core-shell nanoparticles and control their particle size and ultimately optimize the influential parameters. Moreover, response surface methodology (RSM) was used to optimize the thickness of the shell. Herein, four parameters, temperature (67-79 °C), synthesis retention time (45-105 min), TiO : CdS ratio (1.5-7.5) and the power of ultrasound waves (37-53 watt), were optimized to synthesize nanoparticles with an average size of up to 10 nm. A correlation equation was introduced for the size range of 10-90 nm, which was then proven to have excellent predictions. To verify the proposed model, two different sets of combinations were selected to synthesize 10 nm composites, and consequently, nanocomposites with the sizes of 10.4 and 10.9 nm were successfully synthesized. The power of ultrasound waves and retention time had the most influence on the size of the particles. Further experiments proved that the optical absorption spectrum of the composite particles was extended to the visible region. Furthermore, the formation of CdS/TiO core-shell nanocomposites was confirmed by different characterization techniques including XRD, TEM, EDAX, UV-vis, FTIR and DLS.
在本研究中，采用超声方法与微乳液相结合来合成CdS/TiO核壳纳米颗粒，并控制其粒径，最终优化影响参数。此外，使用响应面方法（RSM）来优化壳层厚度。在此，对温度（67 - 79 °C）、合成保留时间（45 - 105分钟）、TiO : CdS比例（1.5 - 7.5）和超声波功率（37 - 53瓦）这四个参数进行了优化，以合成平均尺寸达10 nm的纳米颗粒。针对10 - 90 nm的尺寸范围引入了一个相关方程，随后证明该方程具有出色的预测能力。为验证所提出的模型，选择两组不同的组合来合成10 nm的复合材料，结果成功合成了尺寸为10.4和10.9 nm的纳米复合材料。超声波功率和保留时间对颗粒尺寸影响最大。进一步的实验证明，复合颗粒的光吸收光谱扩展到了可见光区域。此外，通过包括XRD、TEM、EDAX、UV-vis、FTIR和DLS在内的不同表征技术证实了CdS/TiO核壳纳米复合材料的形成。
