Preparation of Ferrioxalate Submicrorods/Graphene Composites and Their Photocatalytic Properties

Ferrioxalate submicrorods/graphene composites were synthesized through a simple solvothermal process in a mixture of ethylene glycol and water. The in situ growth of ferrioxalate submicrorods and the reduction of graphene oxide （GO） were completed in a one-step reaction. Fourier transform infrared and Raman spectroscopy confirmed the reduction of GO. Uniform rod-like ferrioxalates with diameter of about 600 nm and length of several micrometers were well distributed on the graphene sheets. As-obtained composites exhibited better photocatalytic properties than pure ferrioxalate submicrorods. The influence of different contents of GO on photocatalytic performance was also investigated. A possible photocatalytic mechanism of ferrioxalate submicrorods/graphene composites was proposed.

高度取向ZnO单晶亚微米棒阵列的制备与表征

通过低温压热的方法,在经过预先处理长满晶核的SnO2导电玻璃基底上制备出具有高度取向的ZnO亚微米棒阵列.用扫描电子显微镜(SEM)、选区电子衍射(SAED)及X射线粉末衍射(XRD),对制备出的ZnO亚微米棒的结构和形貌进行了表征.SEM测试结果表明,ZnO亚微米棒是六方型的,近乎垂直地长在基底上,棒的直径为400～500nm,长度约为2μm.SAED和XRD结果表明,ZnO亚微米棒为单晶,属于六方晶系,并且沿犤001犦方向择优取向生长.

温度对水热法合成WO_3亚微米棒形貌和光吸收特性的影响

以钨酸钠为W源和硫酸钾为辅助盐,在酸性体系中对水热法合成WO3亚微米棒进行了研究。利用X射线衍射(XRD)、热场发射扫描电子显微镜(SEM)、透射电子显微镜(TEM)和选区电子衍射(SAED)对试样进行分析,结果表明:随着反应温度的升高和pH值的增加,它们都有利于合成WO3亚微米棒;在反应温度为240℃、pH值为1.5和反应时间48h下合成径向尺寸<200nm的晶体结构的WO3亚微米棒,此WO3亚微米棒径向分布较均匀。对不同条件下水热法合成的WO3进行紫外可见光的吸收光谱(UV-VIS)分析可得:随着反应温度的升高和pH值的增加,获得的WO3的紫外光吸收能力是逐渐增加的;WO3亚微米棒具有良好的紫外光吸收能力。

氧化铋亚微米棒在水热条件下的可控生长研究(英文)

用水热法制备了单斜结构的氧化铋亚微米棒,而且通过控制硝酸铋的浓度和水热反应时间,能有效地控制氧化铋亚微米棒的直径和长径比。氧化铋亚微米棒的晶体结构、尺寸和形状用 X-射线衍射、扫描电子显微镜和透射电子显微镜进行了表征。研究发现:随着硝酸铋浓度的降低,氧化铋粒子的尺寸逐渐减小;随着反应时间的增加,氧化铋亚微米棒的直径和长度逐渐增加。此外,还讨论了氧化铋亚微米棒的形成机理。