| 用柠檬酸作调控剂水热合成正交相三氧化钨 |
| Hydrothermal Synthesis of Tungsten Trioxides Using Citric Acid as Controlling Agent |
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| 摘要: 用柠檬酸作调控剂，水热合成了正交相纳米尺寸的WO3矩形片，产物结构与反应温度有很大关系。X射线衍射结果表明，反应产物在393 K时为WO3·H2O和少量的单斜相WO3(γ-WO3);在413 K时为γ-WO3;在433 K和453 K时为正交相WO3(β-WO3)。随反应温度升高，产物发生以下转变:WO3·H< |
| 关键词: 三氧化钨 矩形片 柠檬酸 水热合成 |
| 基金项目: |
| Abstract: Nano-scaled orthorhombic tungsten trioxide rectangular flakes were synthesized by hydrothermal method using citric acid as controlling agent. The phase composition of the products strongly depends on the reaction temperature. XRD results show that the product is tungsten trioxide monohydrate (WO3·H2O) mixed with a small quantity of monoclinic tungsten trioxide (γ-WO3) at 393 K， γ-WO3 at 413 K， and orthorhombic WO3 (β-WO3) at 433 K and 453 K， respectively. SEM images demonstrate that the products obtained at different reaction temperatures are all rectangular flakes with lamellar structure. All the products have almost the same specific surface areas between 8～9 m2·g-1. The phase composition， morphology and specific surface area of the products can be controlled by the molar ratio of citric acid to tungstic acid (nCit/nTA). When nCit/nTA=0， the product is the mixture of h-WO3 (hexagonal system WO3) and WO3·1/3H2O， and have a morphology of nanorods; when nCit/nTA=0.5 or nCit/nTA=1， the product is γ-WO3， and have a morphology of rectangular flakes; when nCit/nTA=2， the product is β-WO3， with the same morphology of rectangular flakes. In the case of adding citric acid， the specific surface area of the products decreases with the increase of nCit/nTA. |
| Keywords: tungsten trioxide rectangular flakes citric acid hydrothermal synthesis |
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| 莫若飞,靳国强,郭向云.用柠檬酸作调控剂水热合成正交相三氧化钨[J].无机化学学报,2007,23(9):1615-1620. |
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