本研究進行濕度對多壁奈米碳管/尼龍6複合材料導電性之影響。本實驗利用兩種方法雙螺桿擠壓射出及粉末研磨熱壓之製程製備多壁奈米碳管/尼龍6複合材料，並分析其電性與機械性質。研究發現當碳管濃度低於滲透臨界值(percolation threshold)時，濕度的上升會導致電阻值上升，並且可透過溫度的提升使電阻率之變化加大，此機制是由於奈米碳管之間距因高分子吸濕膨脹導致電子躍遷距離增加。此外，以NaCl水溶液取代純水進行吸附實驗時，由於離子水合物之產生而使膨脹效應更為劇烈，導致複合材料之電阻率隨電解質濃度增加而上升。試片若吸附Fe2 (SO4)3或Ca(OH)2電解液，複合材料之電阻率反而下降，原因來自吸附在碳管表面之陽離子(Fe3+ or Ca2+)提供管與管之間躍遷的捷徑，因此所需之躍遷能量或躍遷能障(hopping energy or barrier)降低。研究顯示，奈米碳管/尼龍6複合材料對水氣與電解質皆具有感測性，可作為嬰兒流汗、園藝溫室房、軍用飛機帳棚及穿戴式濕度感測元件。

The relationship between conductivity of multi-walled carbon nanotubes (MWCNT)/Nylon 6 composites and humidity is studied. The MWCNT/Nylon6 composites are fabricated through two methods: (1) co-rotating twin-screw extruder and (2) powder hot-compression. The mechanical and electrical properties are also analyzed. It is found below electrical percolation threshold that film resistivity increases with humid-ity rising; increment becomes more profound at elevated temperature. Swelling of polymer layers due to water intercalation expands tube-tube spacing and accounts for increased resistivity. Inter-tube separation be-comes significant as water adsorbates are replaced by hydrates, i.e. Na+(H-2O)n and Cl-(H2O)n in NaCl aqueous solution. In contrast, the adsorption of Fe2(SO4)3 leads to decrease in the resistivity of composites. The phe-nomenon is due to the reduction of hopping energy between CNTs.

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