多晶形γ-CuI晶体的制备与导电性能表征

Preparation and Conductivity Characterization of γ-CuI Crystal with Different Morphologies

以粗碘和硫酸铜为原料,水合肼为还原剂,利用液相法和微乳液法合成了不同晶形γ-CuI晶体。采用XRD和SEM研究了液相法和微乳液工艺技术条件对合成γ-CuI微观结构的影响,分析了具有不同微观结构γ-CuI对其导电性能的影响。结果表明,分别以聚乙二醇(PEG-6000)和柠檬酸为表面活性剂,采用液相法常温下500 r/min反应30 min可制备出纳米球形和三角锥形γ-CuI。按CTAB-正戊醇-环己烷-水配比3∶3∶7∶10分别配制硫酸铜和碘化铵微乳液,常温下500 r/min反应2 h可制备出六边形薄片状γ-CuI。不同微观形貌和粒径分布对γ-CuI产品电导率具有较大的影响。纳米球形γ-CuI电导率最小,为4.9Ω.cm。

The γ-CuI crystals with different morphologies were prepared using crude iodine and CuSO4 as raw material,N2H4· H2O as reducing agent by liquid phase method and micro-emulsion technique respectively.The effect of liquid phase method and micro-emulsion technique conditions on the microstructure of γ-CuI crystals were studied by XRD and SEM techniques,and the influence of different morphologies on the conductivity of γ-CuI crystal was also analyzed.The results indicated that γ-CuI crystals with nano spherical and triangular pyramidal shapes were prepared respectively by using the liquid phase method,at 500 r/min for 30 min,PEG-6000 and citric acid as surfactants respectively.The γ-CuI crystal with hexagon shape was synthesized from the CuSO4 and NH4I solution prepared by controlling the CTAB： n-pentanol： cyclohexane： water（volume ratio） of 3∶3∶7∶10 respectively,at 500 r/min for 2 h.Different morphologies and crystal sizes had great impact on the conductivity of γ-CuI,and the γ-CuI crystal with nano spherical shape has the lowest conductivity of 4.9 Ω·cm.