Luminescent MOF crystals embedded in PMMA/PDMS transparent films as effective NO2 gas sensors,Molecular Systems Design & Engineering

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Luminescent MOF crystals embedded in PMMA/PDMS transparent films as effective NO2 gas sensors
Molecular Systems Design & Engineering ( IF 3.2 ) Pub Date : 2020-01-23 , DOI: 10.1039/c9me00164f
Francisco G. Moscoso _{1,

2,

3,

4} , José Almeida _{5,

6,

7,

8,

9} , Ahmad Sousaraei _{4,

10,

11,

12} , Tânia Lopes-Costa _{1,

2,

3,

4} , Ana M. G. Silva _{5,

6,

7,

8,

9} , Juan Cabanillas-Gonzalez _{4,

10,

11,

12} , Luís Cunha-Silva _{5,

6,

7,

8,

9} , José M. Pedrosa _{1,

2,

3,

4}

Affiliation

A fluorescent NO₂ gas sensor using the metal–organic framework (MOF) Tb(BTC) (BTC = benzene-1,3,5-tricarboxylate) as an active material is reported here. The lanthanide MOF crystals have been immobilized in transparent films of two different inert and non-emissive polymers i.e. polymethylmethacrylate (PMMA) and polydimethylsiloxane (PDMS) by spin coating Tb(BTC) suspended in the corresponding polymer organic solution onto solid substrates. The presence of the MOF particles in the resulting fluorescent films has been further confirmed by SEM and optical microscopy images. The sensing films exhibit fast and sensitive responses (fluorescence quenching) when exposed to a low concentration of NO₂. The dependence of the sensor response on the analyte concentration fitted a two-site Stern–Volmer quenching model from which good calibration curves were obtained. These properties, along with recovery of the sensor emission after gentle heating (50 °C), make these materials realistic candidates for the development of luminescent sensing films based on MOFs.

中文翻译：

嵌入PMMA / PDMS透明膜中的发光MOF晶体可作为有效的NO2气体传感器

本文报道了使用金属-有机骨架（MOF）Tb（BTC）（BTC =苯-1,3,5-三羧酸苯）作为活性材料的荧光NO ₂气体传感器。通过将悬浮在相应聚合物有机溶液中的Tb（BTC）旋涂到固体基质上，已将镧系元素MOF晶体固定在两种不同的惰性和非发射性聚合物（即聚甲基丙烯酸甲酯（PMMA）和聚二甲基硅氧烷（PDMS））的透明膜中。通过SEM和光学显微镜图像进一步证实了所得荧光膜中MOF颗粒的存在。当暴露于低浓度的NO _2中时，传感膜表现出快速而灵敏的响应（荧光猝灭）。传感器响应对分析物浓度的依赖性符合两点Stern-Volmer淬灭模型，从中可以获得良好的校准曲线。这些特性以及在温和加热（50°C）后传感器发射的恢复，使这些材料成为开发基于MOF的发光传感膜的现实选择。

更新日期：2020-01-23

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