Organic and metal-organic polymers which have electrical properties have opened up a promising field in material science and engineering. Phthalocyanine (H2Pc) and metal oxide– phthalocyanine (MO-Pc) where (MO = ZnO, NiO, FeO and CoO) were prepared by urea fusion technique. The prepared composites were identified by means of Fourier transform infrared spectroscopy (IR) and X-ray diffraction (XRD). The XRD data indicate that the ZnO-Pc and NiO-Pc are highly crystalline and particle sizes are 13 nm and 9 nm respectively. The dielectric properties including dielectric constant ɛ' and dielectric loss ɛ'' of the prepared composites were calculated from the experimental capacitance values in the frequency range 100 Hz to 5MHz and in the temperature range of 25oC to 120oC. Generally, ɛ' are found to be decreased with increasing frequency and increase with increasing temperature. It is obvious that, appearance of peak for each MO in the dielectric loss suggests the presence of relaxing dipoles in the MO-Pc nanocomposites. The relaxation time τ, activation enthalpy ΔH and the entropy change ΔS of the prepared composites were calculated. The obtained data were correlated to the nature of doping metal oxide.
具有电学性能的有机和
金属有机聚合物开辟了材料科学和工程领域的一个有前途的方向。采用
尿素熔融技术制备了
酞菁(H2Pc)和金属氧化物-
酞菁(MO-Pc),其中(MO = ZnO,NiO,FeO和CoO)。通过傅里叶变换红外光谱(IR)和X射线衍射(XRD)对制备的复合材料进行了鉴定。XRD数据表明,ZnO-Pc和NiO-Pc高度结晶,颗粒大小分别为13纳米和9纳米。通过频率范围为100 Hz至5
MHz和温度范围为25°C至120°C的实验电容值计算了制备复合材料的介电性能,包括介电常数ɛ'和介电损耗ɛ''。一般来说,随着频率的增加,ɛ'被发现减少,而随着温度的升高则增加。显然,每个MO在介电损耗中出现峰值,表明MO-Pc纳米复合材料中存在弛豫偶极子。计算了制备复合材料的弛豫时间τ、活化焓ΔH和熵变ΔS。得到的数据与掺杂金属氧化物的性质相关联。