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首页> 外文期刊>RSC Advances >Phase and morphology evolution of VO2 nanoparticles using a novel hydrothermal system for thermochromic applications: the growth mechanism and effect of ammonium (NH4+)
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Phase and morphology evolution of VO2 nanoparticles using a novel hydrothermal system for thermochromic applications: the growth mechanism and effect of ammonium (NH4+)

机译：vo2纳米粒子使用新型水热系统进行热致变色应用的相位和形态演化：铵（NH4 +）的生长机理和作用

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摘要

To reveal the formation mechanism of VO _(2) nanomaterials in a hydrothermal system, an experimental method was designed to study the growth and crystallization of a VO _(2) nanomaterial by combining the reduction of V _(2) O _(5) and homogeneous precipitation method. For Route A without the addition of ammonium, VO _(2) (B) nanobelts were assembled by (VO _(2) ) _( x ) · y H _(2) O thin nano-slices, and for Route B in the presence of ammonium, the VO _(2) (M) nanoparticles were decomposed from (NH _(4) ) _(2) V _(4) O _(9) sheets. The ammonium solution played a crucial role in the formation of the (NH _(4) ) _(2) V _(4) O _(9) intermediate phase and finally the VO _(2) (M) nanoparticles. Therefore, by contrasting Routes A and B, our results revealed that the ammonium (NH _(4) ~(+) ) ion changed the reaction process and significantly influenced the preparation of well-crystallized VO _(2) (M) nanoparticles under hydrothermal conditions. The obtained VO _(2) (M) nanoparticles exhibited a high phase transition enthalpy (Δ H = 32.4 J g ~(?1) ). The VO _(2) -PET composite films that were derived from these VO _(2) (M) nanoparticles exhibited excellent optical switching characteristics ( T _(lum) = 33.5%, Δ T _(sol) = 16.0%). Moreover, W-doped VO _(2) nanoparticles with different W doping levels were also prepared. The efficiency of W ~(6+) dopants to lower the transition phase temperature ( T _(c) ) was determined to occur at a rate of 19.8 K per at%.
机译：为了揭示水热系统中VO _（2）纳米材料的形成机制，设计了一种实验方法，以通过组合V _（2）O _（5）的还原来研究VO _（2）纳米材料的生长和结晶。（5 ）和均匀的沉淀法。对于没有添加铵的无线A，通过（VO _（2））_（x）·Y H _（2）薄纳米切片组装VO _（2）（B）纳米核，并用于路线B铵的存在，VO _（2）（M）纳米颗粒（NH _（4））_（2）V _（4）o o _（9）片分解。铵溶液在（NH _（4））_（2）V _（4）o o _（9）中间相的形成中起到至关重要的作用，最后是VO _（2）（m）纳米颗粒。因此，通过对比途径A和B，我们的结果表明，铵（NH _（4）〜（+）离子改变了反应过程，并显着影响了良好结晶的VO _（2）（M）纳米粒子的制备水热条件。所得VO _（2）（M）纳米颗粒表现出高相转变焓（δh= 32.4Jg〜（α1））。衍生自这些VO _（2）（M）纳米颗粒的VO _（2）型复合膜表现出优异的光学开关特性（T _（LUM）= 33.5％，δT_（溶胶）= 16.0％）。此外，还制备了具有不同W掺杂水平的W掺杂的VO _（2）纳米颗粒。测定W〜（6 +）掺杂剂降低过渡相温度（T _（c））的效率，以每根50％的速率为19.8k。

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