铌金属-有机骨架膜的制备与表面改性及其气敏应用,Advanced Materials Interfaces

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铌金属-有机骨架膜的制备与表面改性及其气敏应用
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2022-07-17 , DOI: 10.1002/admi.202200742
Patima Nizamidin ₁ , Qin Yang ₁ , Caiping Guo ₁ , Anaerguli Wufuer ₁ , Abliz Yimit ₁ , Turghun Muhammad ₁

Affiliation

由对苯二甲酸 (bdc) 和 1,8,4,5-萘四甲二亚胺 (NDI) 构成的铌金属-有机骨架 (Nb-MOF = [Nb ₂ (bdc) ₂ (NDI)] _n ) 膜位于使用紫外光照射方法在铌酸锂 (LiNbO ₃ ) 薄膜复合光波导 (COWG) 衬底表面生长的功。生长 20 分钟后，Nb-MOF 膜形成类似石墨烯的结构，孔径为 50 nm，厚度为 96 nm。在室温 (25 °C) 下，就 COWG 传感器而言，Nb-MOF 对 H ₂ S 和 SO ₂的响应最大，其次是乙二胺 (EDA) 和 NO ₂，与15种苯类、胺类、酸性气体共存。为了提高其响应选择性，将螺恶嗪（SP）嵌入到Nb-MOF框架中，得到了表面光滑雪花印迹的SP@Nb-MOF膜COWG。在气敏性能上，所得COWG对H ₂ S的响应最大，而对SO ₂、NO ₂等气体的响应明显减弱。当 SP@Nb-MOF 膜暴露于 H ₂ S 气体时，会诱导质子转移和形态调制。所提出的传感器还显示出宽检测范围 (1 × 10 ^{4 –0.1 ppb)、快速响应 (4 s) 和 120 d 到 H}₂的长期稳定性S 在室温 (25 °C) 和 25% 相对湿度下。

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Fabrication and Surface Modification of Niobium Metal–Organic Framework Membrane and its Gas Sensing Application

The niobium metal–organic framework (Nb-MOF = [Nb₂(bdc)₂(NDI)]_n) membrane, constructed from terephthalic acid(bdc) and 1,8,4,5-naphthalenetetracarboxdiimide (NDI), is in this work grown on the surface of lithium niobate (LiNbO₃) film composite optical waveguide (COWG) substrate using UV-light illumination method. After growing for 20 min, the Nb-MOF membrane forms as a graphene-like structure with 50 nm pore size and 96 nm thickness. At room temperature (25 °C), in terms of COWG sensors, Nb-MOF exhibits the greatest response to H₂S and SO₂, followed by ethylenediamine (EDA) and NO₂, coexistence with 15 kinds of benzenes, amines, and acidic gases. In order to improve its response selectivity, the spirooxazine (SP) is embedded into the Nb-MOF frame, and a SP@Nb-MOF membrane COWG with smooth-snowflake imprinted surface is obtained. In gas sensing performance, the obtained COWG shows the greatest response to H₂S, while the response of SO₂, NO₂, and other gases are obviously diminished. When the SP@Nb-MOF membrane exposes to H₂S gas, proton-transfer and morphology modulation are induced. The presented sensor also shows a wide detection range (1 × 10⁴–0.1 ppb), fast response (4 s), and long-term stability of 120 d to H₂S at room temperature (25 °C) and 25% relative humidity.

更新日期：2022-07-17

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