Chalcogenide and pnictide nanocrystals from the silylative deoxygenation of metal oxides,Journal of Materials Chemistry A

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Chalcogenide and pnictide nanocrystals from the silylative deoxygenation of metal oxides
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2017-09-11 00:00:00 , DOI: 10.1039/c7ta02581e
Chia-Cheng Lin _{1,

2,

3,

4} , Shannon J. Tan _{1,

2,

3,

4} , Javier Vela _{1,

2,

3,

4,

5}

Affiliation

Transition metal chalcogenide and pnictide nanocrystals are of interest for optoelectronic and catalytic applications. Here, we present a generalized route to the synthesis of these materials from the silylative deoxygenation of metal oxides with trimethylsilyl reagents. Specific nanophases produced in this way include Ni₃S₂, Ni₅Se₅, Ni₂P, Co₉S₈, Co₃Se₄, CoP, Co₂P, and heterobimetallic (Ni/Co)₉S₈. The resulting chalcogenide nanocrystals are hollow, likely due to differential rates of ion diffusion during the interfacial phase transformation reaction (Kirkendall-type effect). In contrast, the phosphide nanocrystals are solid, likely because they form at higher reaction temperatures. In all cases, simultaneous partial decomposition of the deoxygenating silyl reagent produces a coating of amorphous silica around the newly formed nanocrystals, which could impact their stability and recyclability.

中文翻译：

金属氧化物的甲硅烷基化脱氧作用产生的硫属元素化物和磷化物纳米晶体

过渡金属硫属元素化物和磷化物纳米晶体对光电和催化应用很感兴趣。在这里，我们提出了一种通过三甲基甲硅烷基试剂对金属氧化物进行甲硅烷基化脱氧来合成这些材料的一般方法。以这种方式产生的特定纳米相包括Ni ₃ S ₂，Ni ₅ Se ₅，Ni ₂ P，Co ₉ S ₈，Co ₃ Se ₄，CoP，Co ₂ P和异双金属（Ni / Co）₉ S ₈。产生的硫族化物纳米晶体是空心的，这可能是由于界面相变反应（Kirkendall型效应）过程中离子扩散速率不同所致。相反，磷化物纳米晶体是固体，可能是因为它们在较高的反应温度下形成。在所有情况下，脱氧甲硅烷基试剂的同时部分分解会在新形成的纳米晶体周围产生无定形二氧化硅涂层，这可能会影响其稳定性和可回收性。

更新日期：2017-09-19

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