Paddubskaya Alesia, Batrakov Konstantin, Khrushchinsky Arkadiy, Kuten Semen, Plyushch Artyom, Stepanov Andrey, Remnev Gennady, Shvetsov Valery, Baah Marian, Svirko Yuri, Kuzhir Polina
Institute for Nuclear Problems of Belarusian State University, Bobruiskaya Str. 11, 220006 Minsk, Belarus.
Radiophysics Department, Tomsk State University, Lenin Ave, 36, 634050 Tomsk, Russia.
Nanomaterials (Basel). 2021 Jan 11;11(1):170. doi: 10.3390/nano11010170.
We experimentally and theoretically investigated the effects of ionizing radiation on a stack of graphene sheets separated by polymethyl methacrylate (PMMA) slabs. The exceptional absorption ability of such a heterostructure in the THz range makes it promising for use in a graphene-based THz bolometer to be deployed in space. A hydrogen/carbon ion beam was used to simulate the action of protons and secondary ions on the device. We showed that the graphene sheets remain intact after irradiation with an intense 290 keV ion beam at the density of 1.5 × 1012 cm-2. However, the THz absorption ability of the graphene/PMMA multilayer can be substantially suppressed due to heating damage of the topmost PMMA slabs produced by carbon ions. By contrast, protons do not have this negative effect due to their much longer mean free pass in PMMA. Since the particles' flux at the geostationary orbit is significantly lower than that used in our experiments, we conclude that it cannot cause tangible damage of the graphene/PMMA based THz absorber. Our numerical simulations reveal that, at the geostationary orbit, the damaging of the graphene/PMMA multilayer due to the ions bombardment is sufficiently lower to affect the performance of the graphene/PMMA multilayer, the main working element of the THz bolometer, which remains unchanged for more than ten years.
我们通过实验和理论研究了电离辐射对由聚甲基丙烯酸甲酯（PMMA）平板隔开的石墨烯片堆叠的影响。这种异质结构在太赫兹范围内具有出色的吸收能力，使其有望用于部署在太空中的基于石墨烯的太赫兹测辐射热计。使用氢/碳离子束来模拟质子和二次离子对该器件的作用。我们表明，在用密度为1.5×10¹² cm⁻²的强290 keV离子束辐照后，石墨烯片保持完好无损。然而，由于碳离子对最顶层PMMA平板造成的热损伤，石墨烯/PMMA多层结构的太赫兹吸收能力可能会被大幅抑制。相比之下，质子在PMMA中的平均自由程长得多，因此不会产生这种负面影响。由于地球静止轨道上粒子的通量明显低于我们实验中使用的通量，我们得出结论，它不会对基于石墨烯/PMMA的太赫兹吸收器造成明显损坏。我们的数值模拟表明，在地球静止轨道上，离子轰击对石墨烯/PMMA多层结构造成的损伤足够小，不会影响太赫兹测辐射热计的主要工作元件石墨烯/PMMA多层结构的性能，该结构在十多年内保持不变。
