Influence of Microwave Frequency and Power on Nanometal Growth
Influence of Microwave Frequency and Power on Nanometal Growth
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DOI：
10.1021/acs.jpcc.7b11366
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发表时间：
2018-02
影响因子：
3.7
通讯作者：
B. Ashley;Christopher M. Dyer;Jeffery R. Owens;G. Strouse
中科院分区：
文献类型：
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作者：
B. Ashley;Christopher M. Dyer;Jeffery R. Owens;G. Strouse
在微波（MW）反应器中实现的快速加热速率（ΔT/δt）已被证明可加速反应速率，这是由于吸收到反应物中的直接功率（Pabs）导致更快的动力学。Pabs与由真实的（e′）和虚部（e″）定义的材料的介电截面成比例。在MEMS中，电介质横截面将是频率相关的以及尺寸相关的。在这项工作中，在2.45，15.50，和18.00 GHz的频率和恒定的ΔT/δt的镍纳米晶体的频率依赖性的生长进行了研究，以评估的频率依赖性的MW增长的Ni。观察到生长速率的标度律行为，该行为取决于MW电场强度。前体分子的“构型能量”与最终纳米颗粒尺寸之间的关系。该研究清楚地描述了微波效应，该效应取决于微波的频率和功率，并提供了进一步的见解。
The rapid heating rates (ΔT/δt) achieved in a microwave (MW) reactor has been shown to accelerate reaction rates due to the direct power absorbed (Pabs) into the reactants leading to faster kinetics. The Pabs is proportional to the dielectric cross section of the materials as defined by the real (e′) and imaginary (e″) components. In a nanocrystal, the dielectric cross-section will be frequency dependent as well as size dependent. In this work, the frequency dependent growth of nickel nanocrystals at frequencies of 2.45, 15.50, and 18.00 GHz at constant ΔT/δt was studied to evaluate the frequency dependence on MW growth of Ni. A scaling law behavior for growth rates is observed that is shown to depend on the MW electric field strength. A relationship is derived between the “configurational energy” of the precursor molecules and the final nanoparticle size. The study provides a clear description of a microwave effect that is dependent on the frequency and power of the microwave and offers further insight i...