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论文类型：期刊论文

发表时间：2016-01-01

发表刊物：RSC ADVANCES

收录刊物：SCIE、EI

卷号：6

期号：104

页面范围：102472-102481

ISSN号：2046-2069

摘要：Cu and Ni chalcogenides were synthesized by hydrothermal methods and characterized by XRD and SEM. Their properties on electromagnetic (EM) wave absorption were evaluated by a vector network analyzer with a coaxial measurement. For the Cu7.2S4 and Cu2Se-paraffin systems, the peak for minimum reflection loss (R-L) shifted from high frequency to low frequency as the thickness increases. At a thickness of 1.6 mm, the Cu7.2S4-paraffin composite could achieve a R-L value of -36.60 dB at the absorption peak frequency (APF) of 17.2 GHz with a bandwidth of 6 GHz for R-L < -10 dB. For the Cu2Se-paraffin composite, the R-L value, APF, and bandwidth were -27.5 dB, 11.76 GHz, and 3 GHz, respectively, at a thickness of 1.5 mm. For the NiO, NiS, and NiSe-paraffin composite systems, the APF for minimal R-L moved from high to low frequency as the thickness increases, too. The NiO-paraffin had a R-L of -12.68 dB at the APF of 12.8 GHz when the thickness of the sample was 2 mm. For the NiS-paraffin composite, the R-L value, APF, and bandwidth were -31.93 dB, 7.52 GHz, and 2 GHz, respectively, with a thickness of 3 mm, while the NiSe-paraffin composite had a R-L value, APF, and bandwidth of -41.22 dB, 8.24 GHz, and 1.6 GHz, respectively, with a thickness of 2.2 mm. All Cu and Ni chalcogenides had excellent EM reflection loss, enabling them to be excellent microwave absorbing materials. And most importantly, our results were the first to report superior EM absorption properties for selenides.