Coleman Devin, Mangolini Lorenzo
Material Science & Engineering Program and Mechanical Engineering Department, University of California, Riverside, Riverside, California 92521, United States.
ACS Omega. 2019 Jun 10;4(6):10089-10093. doi: 10.1021/acsomega.9b00933. eCollection 2019 Jun 30.
We demonstrate the synthesis of silicon carbide nanoparticles exhibiting monolayer to few-layer graphene coatings and characterize their optical response to confirm their plasmonic behavior. A multistep, low-temperature plasma process is used to nucleate silicon particles, carbonize them in-flight to give small silicon carbide nanocrystals, and coat them in-flight with a graphene shell. These particles show surface plasmon resonance in the infrared region. Tuning of the plasma parameters allows control over the nanoparticle size and consequently over the absorption peak position. A simplified equivalent dielectric permittivity model shows excellent agreement with the experimental data. In addition, optical characterization at high temperatures confirms the stability of their optical properties, making this material attractive for a broad range of applications.
我们展示了具有单层至少层石墨烯涂层的碳化硅纳米颗粒的合成，并对其光学响应进行了表征，以确认其等离子体行为。采用多步低温等离子体工艺使硅颗粒成核，在飞行过程中将其碳化以得到小的碳化硅纳米晶体，并在飞行过程中用石墨烯壳对其进行包覆。这些颗粒在红外区域表现出表面等离子体共振。调节等离子体参数可控制纳米颗粒的尺寸，进而控制吸收峰位置。一个简化的等效介电常数模型与实验数据显示出极好的一致性。此外，高温下的光学表征证实了其光学性质的稳定性，使得这种材料对广泛的应用具有吸引力。
