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Synthesis of Metal Oxide Nanoparticles by Rapid, High-Temperature 3D Microwave Heating

机译：快速，高温3D微波加热合成金属氧化物纳米粒子

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摘要

Microwave-assisted fabrication has propelled the recent synthesis and processing approaches of various nanomaterials. However, in most previous studies, the synthesis temperature is limited to below 1100 K, which restricts its application. Here, a rapid, in situ 3D heating method to manufacture well-dispersed metal oxide nanoparticles on a 3D carbonized wood (denoted as C-wood) host using microwaves as the driving power is reported. The moderate electronic conductivity of C-wood contributes to the local Joule heating and the good thermal conductivity guarantees the rapid 3D heating of the overall material. The temperature of the C-wood increases from room temperature to approximate to 2200 K in 4 s (approximate to 550 K s(-1)), stabilizing to 1400 K, and then cooling back down to room temperature within 2 s. The preloaded precursor salts rapidly decompose and form ultrafine (approximate to 11 nm) metal oxide nanoparticles on the surface of the C-wood during the rapid quenching. The process takes place in air, which helps prevent the metal oxides from being reduced by the carbon. The 3D heating method offers an effective route to the rapid and scalable synthesis of metal oxide nanoparticles.
机译：微波辅助制造推动了各种纳米材料的最新合成和加工方法。但是，在大多数以前的研究中，合成温度限制在1100 K以下，这限制了它的应用。在此，报道了一种快速原位3D加热方法，该方法使用微波作为驱动力，在3D碳化木（表示为C-木材）主体上制造分散良好的金属氧化物纳米颗粒。 C型木的适度电子导电性有助于局部焦耳加热，良好的导热性可确保整个材料的快速3D加热。 C木材的温度在4 s内从室温升高到大约2200 K（大约550 K s（-1）），稳定到1400 K，然后在2 s内冷却回到室温。预加载的前体盐在快速淬火过程中迅速分解并在C-木材的表面上形成超细（约11 nm）的金属氧化物纳米颗粒。该过程在空气中进行，这有助于防止金属氧化物被碳还原。 3D加热方法为快速，可扩展地合成金属氧化物纳米颗粒提供了一条有效途径。

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