以聚苯胺摻雜3d過渡金屬磁性與電傳輸研究

Magnetic and electric transport property studies of PANI-doped with 3d transition metal

陳紅府(Hung-Fu Chen)

中原大學/理學院/物理研究所/碩士(2011年)

https://doi.org/10.6840/CYCU.2011.00038

摘要

摻雜3d金屬氯化物(MCl2, M=Mn, Fe, Co, Ni, Cu, Zn)之聚苯胺(PANI)其成分組成、電性、與磁性的變化已透過X光繞射、TGA熱重分析、FT-IR光譜儀、與多功能物性量測系統研究。以電化學定電位法，在0.9 V的條件下，所合成之摻雜3d金屬氯化物聚苯胺樣品，首先透過Rietveld全光譜結構精算法（Rietveld full pattern refinement method）精算。結果顯示樣品含有結構為氯化物的水合體，並與未結晶之聚苯胺形成混合物。在TGA熱重分析實驗上，由25 ℃到800 ℃，依序觀測到了不同溫度下，水與水合物的揮發、氯化物的裂解、未反應苯胺單體的裂解、以及聚苯胺之裂解現象。由600 ℃以上的殘餘氧化物重量，可以估算出PANI與氯化物之比例，並確認了X光光譜之結果。FT-IR光譜分析顯示，樣品中的聚苯胺中，N=Q=N、C=N、與N=B=N等特徵峰均顯現明顯之位移。這顯示部分屬氯化物確實鍵結上聚苯胺之長鍊。含Mn、Co、Ni、Cu、Zn氯化物摻雜PANI樣品之變溫交流磁化率實驗，均可用順磁之居禮定律來描述。其有效磁矩大小符合M原子之自由原子磁矩大小排序(Mn、Co、Ni、Cu、Zn)。在5 K的溫度下，其磁滯曲線飽和強度亦依照原子序大小排列。同時並沒有觀測到磁滯現象，顯示沒有磁疇的產生。

關鍵字

過渡金屬 ； 聚苯胺

並列摘要

The composition, electric transport, and magnetic properties of 3d metal chloride doped PANI was investigated by x-ray diffraction, thermogravimetry analysis, FT-IR spectroscopy and PPMS. Mn, Co, Ni, Cu, Zn doped PANI samples were fabricated by electrochemistry method in constant voltage at 0.9 V. The resulted powder samples were first analysis by Rietveld full pattern refinement method. It shows that all samples are chloride hydrate with PANI mixture. The decomposition of water and chloride hydrate, aniline monomer, and PANI were observed one after another at thermogravimetry analysis between 25 and 800 ℃. The ratio of PANI and chloride hydrate can be estimated from the mass of the residue at the temperature above 600 ℃. FT-IR spectroscopy show the characteristic peaks of N=Q=N, C=N, and N=B=N are all shifted. These results revealed the chloride hydrate are bounded into PANI chains and confirmed the x-ray result. The magnetic properties of Mn, Co, Ni, Cu, Zn doped PANI chloride hydrates were measured by varied temperature ac magnetic susceptibility experiments. All samples can be well described by Curie law. The effective mass of each samples are proportional to atomic number of dopants. Similar behavior were also found in M-H curve at 5 K. No hysteresis loop was found in any samples. It reveals that magnetic domain was not growth at this temperature.

並列關鍵字

PANI ； 3d transition metal

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