CAJ | 학술논문

文章采用THZ-TDS技术分别研究了室温大气环境下多壁碳纳米管(MWNTs)和MWNTs/云母复合物在0.2～1.75THz波段的吸收谱、折射率谱、复介电常数和屏蔽效能.结果表明两种样品在此波段有明显的特征吸收峰,且吸收谱存在显著差异,两种样品的平均折射率分别为4.27(MWNTs)和1.81(MWNTs/云母复合物).随着频率的增加,MWNTs的折射率先增大后减小,而MWNTs/云母复合物的折射率减小,呈现反常色散现象.MWNTs在0.25～1.5 THz的范围内屏蔽效能达到30dB以上,而MWNTs/云母复合物在0.2～1.75 THz的范围内屏蔽效能小于30 dB.
문장채용THZ-TDS기술분별연구료실온대기배경하다벽탄납미관(MWNTs)화MWNTs/운모복합물재0.2～1.75THz파단적흡수보、절사솔보、복개전상수화병폐효능.결과표명량충양품재차파단유명현적특정흡수봉,차흡수보존재현저차이,량충양품적평균절사솔분별위4.27(MWNTs)화1.81(MWNTs/운모복합물).수착빈솔적증가,MWNTs적절사솔선증대후감소,이MWNTs/운모복합물적절사솔감소,정현반상색산현상.MWNTs재0.25～1.5 THz적범위내병폐효능체도30dB이상,이MWNTs/운모복합물재0.2～1.75 THz적범위내병폐효능소우30 dB.
Terahertz time-domain spectroscopy (THz-TDS) was used to measure the absorbance, refractive index, dielectric constants and shielding effect of MWNTs and MWNTs/mica in the frequency range of 0. 2 ～ 1.75 THz at room temperature. The results indicate that two samples have distinct absorption features, which have significance level in such frequency range. The average refractive indices of two samples are 4.27 (for MWNTs) and 1.81 (for MWNTs/mica) respectively. With frequency increasing, the refractive index of MWNTs firstly increases and then decreases, and that of MWNTs/mica declines, the latter exhibits anomalous dispersion. The shielding effect of MWNTs achieves more than 30dB in the frequency range of 0.25 ～ 1.5 THz, and MWNTs/mica achieves less than 30 dB in the frequency range of 0.2 ～ 1.75 THz.