Exploring new types of absorbing materials has always been the focus and hot spot of stealth research. As we all know, the best conductivity of absorbing materials is generally in the range of semiconductor. Polyoxometalate is a kind of metal oxygen cluster with semiconductor properties and a good electron acceptor, but there is little research on its absorption property. In this work, we synthesized S, N co-doped graphene aerogel (secondary reduction by ascorbic acid)/cobalt (Ⅱ)-substituted α-Keggin-type polyoxometalate (SNGA(Vc)/α-SiW₁₁Co) nanocomposites through some facile routes. The graphene aerogel and polyoxometalate could analogously play the role of alkali and acid, respectively, attracting each other through electrostatic interaction, in addition to hydrogen bonding (N–H- … O, O–H- … O). By changing the types of element doped graphene aerogels and reduction degree, it could regulate the conductivity and affect the polarization relaxation capacity of SNGA(Vc)/α-SiW₁₁Co nanocomposites. With a filling rate of 1:2.5 in paraffin matrix, the maximum reflection loss was up to −67.9 dB at 17.3 GHz and 1.6 mm. There was also another strong absorption peak value of −63.7 dB at 3.5 mm and 6.9 GHz. The absorption bandwidths with the R_L value lower than −10 and −20 dB remarkably reached as strong as 14.1 and 13.4 GHz when the thickness range was 1.5–5 mm, respectively, meaning the super electromagnetic wave absorption ability of SNGA(Vc)/α-SiW₁₁Co nanocomposites. This study demonstrates that the polyoxometalate composite materials can become a novel idea for designing high-efficiency electromagnetic wave absorbers.

新型吸收材料的开发一直是隐身研究的重点和热点。众所周知，吸收材料的最佳电导率通常在半导体的范围内。多金属氧酸盐是一种具有半导体性能和良好的电子受体的金属氧簇，但对其吸收性能的研究很少。在这项工作中，我们合成S，N共掺杂的石墨烯气凝胶（由抗坏血酸二次还原）/钴（Ⅱ） -取代的α-Keggin型多金属氧酸盐（SNGA（VC）/α-硅钨酸₁₁ Co）的通过一些纳米复合材料容易路线。石墨烯气凝胶和多金属氧酸盐可以类似地分别起碱和酸的作用，除氢键作用外，还通过静电相互作用相互吸引（N–H-…O，O –H-…O）。通过改变类型元素掺杂的石墨烯气凝胶和还原度，它可以调节导电率和影响SNGA（VC）的偏振松弛容量/α-硅钨酸₁₁钴纳米复合材料。在石蜡基质中填充率为1：2.5时，在17.3 GHz和1.6 mm处，最大反射损耗高达-67.9 dB。在3.5 mm和6.9 GHz处还有一个强吸收峰值，为-63.7 dB。当厚度范围为1.5-5 mm时，R _L值低于-10和-20 dB的吸收带宽分别达到14.1 GHz和13.4 GHz，这意味着SNGA（Vc）/的超电磁波吸收能力α-硅钨酸₁₁钴纳米复合材料。这项研究表明，多金属氧酸盐复合材料可以成为设计高效电磁波吸收器的新思路。