Polyhedral metal–organic framework monolayer colloidal crystals with sharpened and crystal facet-dependent selectivity for organic vapor sensing,Journal of Materials Chemistry C

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Polyhedral metal–organic framework monolayer colloidal crystals with sharpened and crystal facet-dependent selectivity for organic vapor sensing
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2021-3-18 , DOI: 10.1039/d1tc00810b
Shimo Yu _{1,

2,

3} , Xiang Wang _{1,

2,

3} , Xiuling Jiao _{1,

2,

3} , Cheng Li _{1,

2,

3} , Dairong Chen _{1,

2,

3}

Affiliation

Metal–organic frameworks (MOFs) are potential sensing materials with inherent sensitivity for molecule detection. However, reliable and reproducible MOF-based optical sensors with well-defined selectivity suitable for practical application have not been reported, which is partly due to the lack of control over film textures, crystalline orientations and exposed crystal facets. Herein, we report on versatile MOF optical sensors based on the self-assembly of polyhedral ZIF-8 crystals into monolayer colloidal crystals (MCCs) with precisely controlled particle sizes, crystalline orientations and specific crystal facets. By eliminating grain boundaries and randomly exposed crystal surfaces, the fabricated polyhedral ZIF-8 MCCs exhibited ‘sharpened’ selectivity for organic vapors compared with in situ grown ZIF-8 films. The selectivity of polyhedral ZIF-8 MCCs was also found to depend on the exposed crystal facets. Among three polyhedral ZIF-8 MCCs, namely rhombic dodecahedral (RD), truncated rhombic dodecahedral (TRD) and slightly truncated cubic (TC) ZIF-8 MCCs, RD ZIF-8 MCCs exclusively exposing the (110) facets allow the detection of C5–C8 linear alkane, C6–C8 linear alkenes and C1–C8 linear alcohols according to the sequence of the carbon number, while all branched isomers were excluded through size sieving. Combining fast kinetics, wide linear range and excellent reversibility and stability, RD ZIF-8 MCCs were successfully applied for detecting gasoline octane number and achieving colorimetric sensing.

中文翻译：

多面体金属-有机骨架单层胶体晶体，具有锐化的且取决于晶面的选择性，可用于有机蒸气感测

金属有机框架（MOF）是潜在的传感材料，具有固有的分子检测灵敏度。但是，尚未报道具有可靠且可重现的，基于MOF的光学传感器，具有明确的选择性，适用于实际应用，部分原因是缺乏对薄膜质地，晶体取向和裸露晶面的控制。在这里，我们报告了基于多面体ZIF-8晶体自组装成具有精确控制的粒径，晶体取向和特定晶面的单层胶体晶体（MCC）的多功能MOF光学传感器。通过消除晶界和随机暴露的晶体表面，与原位相比，制造的多面体ZIF-8 MCC对有机蒸气的选择性提高了生长的ZIF-8胶片。还发现多面体ZIF-8 MCC的选择性取决于暴露的晶体面。在三个多面体ZIF-8 MCC中，即菱形十二面体（RD），截头菱形十二面体（TRD）和轻度截头的立方（TC）ZIF-8 MCC中，仅暴露（110）面的RD ZIF-8 MCC允许检测C5 -C8直链烷烃，C6-C8直链烯烃和C1-C8直链醇根据碳原子数的顺序排列，而所有支链异构体均通过筛分排除。结合快速动力学，宽线性范围和出色的可逆性和稳定性，RD ZIF-8 MCC成功地用于检测汽油辛烷值并实现比色传感。

更新日期：2021-04-13

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