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结合插层化学与湿化学方法的优点,建立了一种高比表面积、大径厚比、易分散的二维氧化钨(WO3)纳米片单晶的制备新方法.微米级WO3与Bi2O3在800℃通过固相反应生成层状化合物Bi2W2O9;所得到的Bi2W2O9经盐酸选择性溶出[Bi2O2]层后得到质子化形式的H2W2O7·xH2O相.以H2W2O7·xH2O为钨源,以辛胺插层所得无机-有机混杂纳米带为前驱物,经硝酸氧化除去前驱物中的有机组分后得到正交相WO3·H2O纳米片;将所得到的WO3·H2O纳米片在250~450℃和空气气氛中热处理2~5h(升温速率为2℃/min),得到单斜相WO3单晶纳米片.TEM与SEM分析结果表明,单晶WO3·H2O与WO3纳米片的形貌相似,其大小为(200~500)nm×(200~500)nm,厚度为10~30nm;所得WO3.H2O与WO3纳米片单晶的厚度方向分别为[010]和[001]·N2吸附结果表明,WO3·H2O与WO3纳米片的比表面积分别可达到250与180m2/g.
Combining the advantages of intercalation chemistry and wet chemical methods, a new method for the preparation of two-dimensional tungsten oxide (WO3) single crystal with high specific surface area, large diameter to thickness ratio and easy dispersion was established. ℃ to form layered compound Bi2W2O9 by solid-state reaction.The obtained Bi2W2O9 was selectively dissolved by hydrochloric acid [Bi2O2] layer to obtain a protonated form of H2W2O7 · xH2O phase.With H2W2O7 · xH2O as a tungsten source, - organic hybrid nanobelts as precursors, after nitric acid oxidation to remove the organic components of the precursor to obtain the orthogonal phase WO3 · H2O nanosheets; the resulting WO3 · H2O nanosheets at 250 ~ 450 ℃ and air atmosphere heat treatment The results show that the morphology of single crystal WO3 · H2O and WO3 nanosheets are similar and the size is (200 ~ 500) nm × (200-500) nm and thickness 10-30 nm. The thickness directions of the obtained WO3.H2O and WO3 nanosheets were [010] and [001]. N2 adsorption results show that the adsorption of WO3 · H2O and WO3 Nanoplate specific surface area can reach 250 and 180m2 / g respectively.