Polley Debanjan, Barman Anjan, Mitra Rajib Kumar
Opt Lett. 2014 Mar 15;39(6):1541-4. doi: 10.1364/OL.39.001541.
We investigate the shielding effectiveness and complex conductivity of single-walled carbon nanotubes (SWNT) distributed in a polyvinyl alcohol (PVA) matrix in the THz frequency range. SWNTs are dispersed in PVA matrices with varying SWNT content (keeping the thickness of SWNT/PVA film constant) using a slow-drying method, and terahertz time-domain spectroscopy (THz-TDS) is performed at room temperature in transmission geometry in the frequency range of 0.3-2.1 THz. The transmittance spectra show a possible application of SWNT/PVA composites as low-bandpass filters in the THz frequency region. Shielding effectiveness of all the samples is measured, and, at a particular probing frequency, they tend to follow a linear relationship with SWNT weight fraction in the polymer matrices. THz conductivity of the composite system is described in the light of a.c. hopping conduction.
我们研究了在太赫兹频率范围内，分布于聚乙烯醇（PVA）基体中的单壁碳纳米管（SWNT）的屏蔽效能和复电导率。采用慢干方法将单壁碳纳米管分散在具有不同单壁碳纳米管含量的聚乙烯醇基体中（保持单壁碳纳米管/聚乙烯醇薄膜的厚度恒定），并在室温下于0.3 - 2.1太赫兹频率范围内，采用透射几何结构进行太赫兹时域光谱（THz - TDS）测量。透过率光谱表明单壁碳纳米管/聚乙烯醇复合材料在太赫兹频率区域作为低带通滤波器具有潜在应用。测量了所有样品的屏蔽效能，并且在特定探测频率下，它们与聚合物基体中单壁碳纳米管的重量分数呈现线性关系。根据交流跳跃传导描述了复合体系的太赫兹电导率。
