Department of Physics, Southern Illinois University, Carbondale, IL 62901, USA.
Nanotechnology. 2010 Aug 13;21(32):325601. doi: 10.1088/0957-4484/21/32/325601. Epub 2010 Jul 19.
We report the room temperature (RT) synthesis of silver vanadate nanorods (consisting of mainly beta-AgV O(3)) 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 microm 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 degrees C) and the friction coefficient was between 0.2 and 0.3. HT-XRD revealed that AgV O(3) completely transformed into silver vanadium oxide (Ag(2)V(4)O(11)) and silver with an increase in temperature from RT to 700 degrees C.
我们报告了室温下（RT）通过简单的湿化学途径合成银钒酸盐纳米棒（主要由β-AgV O(3)组成）及其在高温（HT）下的摩擦研究。在恒磁场搅拌下，将钒酸铵突然与硝酸银溶液混合，产生了淡黄色的沉淀物。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/微观结构进行了表征，揭示了银钒酸盐纳米棒的高产率和均匀形成。纳米棒的长度为 20-40 微米，厚度为 100-600 纳米。彻底研究了 pH 值随时间的变化，以了解银钒酸盐纳米棒的形成机制。这种合成过程既不需要高温、表面活性剂，也不需要长时间的反应时间。银钒酸盐纳米材料在 HT（700°C）下表现出良好的润滑性能，摩擦系数在 0.2 和 0.3 之间。HT-XRD 表明，AgV O(3)在从 RT 到 700°C 的温度升高过程中完全转化为银钒氧化物（Ag(2)V(4)O(11))和银。
