Qin Ming, Liang Hongsheng, Zhao Xiaoru, Wu Hongjing
School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China.
School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China.
J Colloid Interface Sci. 2020 Apr 15;566:347-356. doi: 10.1016/j.jcis.2020.01.114. Epub 2020 Feb 1.
Filter paper, as a widely used and low-cost lab consumable, can serve as template for the synthesis of one-dimensional (1D) materials since it is composed of 1D cellulosic fiber. In this work, 1D NiO/NiCoO composite was simply fabricated by adsorption of Ni and Co acetate on the filter paper and subsequent calcination process. The precursors were obtained without further treatment to filter paper or chemical reaction between metal salts. Calcination process leads to the removal of template and formation of binary NiO/NiCoO composite. Electromagnetic (EM) wave absorption performance of NiO/NiCoO composite could be tuned by adjusting the calcination temperatures and dosage of metal salts. For the optimized absorber (calcination temperature of 600 °C and dosage of Ni and Co acetate with 2 mmol and 4 mmol), a wide absorption bandwidth of 6.08 GHz could be achieved with thickness of 1.88 mm and minimum reflection loss value was up to -57.4 dB by changing the thickness. The facile synthetic route may also inspire the preparation of other high-performance one-dimensional EM wave absorbing materials.
滤纸作为一种广泛使用且低成本的实验室耗材，可作为合成一维（1D）材料的模板，因为它由一维纤维素纤维组成。在这项工作中，通过将醋酸镍和醋酸钴吸附在滤纸上并随后进行煅烧过程，简单地制备了一维NiO/NiCoO复合材料。无需对滤纸进行进一步处理或金属盐之间发生化学反应即可获得前驱体。煅烧过程导致模板去除并形成二元NiO/NiCoO复合材料。通过调节煅烧温度和金属盐用量，可以调整NiO/NiCoO复合材料的电磁波（EM）吸收性能。对于优化后的吸收剂（煅烧温度为600°C，醋酸镍和醋酸钴用量分别为2 mmol和4 mmol），厚度为1.88 mm时可实现6.08 GHz的宽吸收带宽，通过改变厚度，最小反射损耗值可达-57.4 dB。这种简便的合成路线也可能会启发其他高性能一维电磁波吸收材料的制备。
