Room temperature synthesis and high temperature frictional study of silver vanadate nanorods
Room temperature synthesis and high temperature frictional study of silver vanadate nanorods
复制标题
DOI：
10.1088/0957-4484/21/32/325601
复制
发表时间：
2010-08
期刊：
影响因子：
3.5
通讯作者：
D. Singh;K. Polychronopoulou;C. Rebholz;S. Aouadi
中科院分区：
文献类型：
--
作者：
D. Singh;K. Polychronopoulou;C. Rebholz;S. Aouadi
采用湿化学法在室温下合成了钒酸银纳米棒（主要由β-AgVO 3组成），并对其高温摩擦性能进行了研究。钒酸铵与硝酸银溶液在恒定磁力搅拌下的突然混合产生浅黄色沉淀。通过X射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）对沉淀物的结构/微结构表征揭示了银酸盐纳米棒的高产率和均匀形成。纳米棒的长度为20-40 μm，厚度为100-600 nm。研究了pH值随时间的变化规律，以了解钒酸银纳米棒的形成机理。该合成方法不需要高温、表面活性剂，反应时间也不长。钒酸银纳米材料在高温（700 °C）下显示出良好的润滑行为，并且摩擦系数在0.2和0.3之间。HT-XRD显示，随着温度从室温升高到700 °C，AgV O3完全转变为银氧化钒（Ag 2 V4 O 11）和银。
We report the room temperature (RT) synthesis of silver vanadate nanorods (consisting of mainly β-AgV O3) by a simple wet chemical route and their frictional study at high temperatures (HT). The sudden mixing of ammonium vanadate with silver nitrate solution under constant magnetic stirring resulted in a pale yellow coloured precipitate. Structural/microstructural characterization of the precipitate through x-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed the high yield and homogeneous formation of silver vanadate nanorods. The length of the nanorods was 20–40 µm and the thickness 100–600 nm. The pH variation with respect to time was thoroughly studied to understand the formation mechanism of the silver vanadate nanorods. This synthesis process neither demands HT, surfactants nor long reaction time. The silver vanadate nanomaterial showed good lubrication behaviour at HT (700 °C) and the friction coefficient was between 0.2 and 0.3. HT-XRD revealed that AgV O3 completely transformed into silver vanadium oxide (Ag2V4O11) and silver with an increase in temperature from RT to 700 °C.