Crystallization and architecture engineering of ZnWO4 for enhanced photoluminescence,CrystEngComm

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Crystallization and architecture engineering of ZnWO4 for enhanced photoluminescence
CrystEngComm ( IF 2.6 ) Pub Date : 2020-08-20 , DOI: 10.1039/d0ce00828a
Meiting Li _{1,

2,

3,

4,

5} , Xuejiao Wang _{5,

6,

7,

8} , Qi Zhu _{1,

2,

3,

4,

5} , Ji-Guang Li _{9,

10,

11,

12} , Byung-Nam Kim _{9,

10,

11,

12}

Affiliation

Oxalic acid (H₂C₂O₄) and (NH₄)₂SO₄ were originally examined as crystallization and architecture directing reagents for the hydrothermal synthesis of ZnWO₄, with the pivotal roles of the C₂O₄²⁻/Zn²⁺ (R) and SO₄²⁻/Zn²⁺ (R′) molar ratios and hydrothermal temperature/duration investigated in detail. It was clearly demonstrated that C₂O₄²⁻ remarkably altered the reaction pathway and suppressed the intrinsic 1D growth of ZnWO₄, eventually leading to 2D crystallites with exposed ab planes. (NH₄)₂SO₄ further promoted 2D growth and self-assembly of the ZnWO₄ crystallites, leading to flower-like architectures of up to ∼2.5 μm sized large microplates. Photoluminescence properties were thoroughly analyzed and discussed for the representative ZnWO₄ and (Zn_0.98Eu_0.02)WO₄ products after 700 °C calcination to show the importance of crystallite/architecture engineering.

中文翻译：

ZnWO4的结晶和结构工程以增强光致发光

草酸（H ₂ C ₂ O ₄）和（NH ₄）₂ SO ₄最初是作为水热合成ZnWO _4的结晶和体系结构指导试剂，其主要作用是C ₂ O ₄^2- / Zn ^{2详细研究了+}（R）和SO ₄^2- / Zn ²⁺（R '）的摩尔比和水热温度/持续时间。清楚地表明，C ₂ O ₄²⁻显着改变了反应途径并抑制了ZnWO ₄的固有1D生长，最终导致ab平面暴露的2D微晶。（NH ₄）₂ SO ₄进一步促进了ZnWO ₄晶体的2D生长和自组装，从而导致了高达约2.5μm大小的大微板的花状结构。在700°C煅烧后，对代表性的ZnWO ₄和（Zn _0.98 Eu _0.02）WO ₄产物的光致发光性质进行了彻底的分析和讨论，以显示微晶/建筑工程学的重要性。

更新日期：2020-10-05

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