Surface modified Ti-MOF/TiO2 membrane and its gas sensing characteristics

IF 2.7 4区材料科学 Q3 CHEMISTRY, PHYSICAL Surface Innovations Pub Date : 2022-08-30 DOI:10.1680/jsuin.22.01021

P. Nizamidin, Caiping Guo, Qin Yang, Huifang Chen

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引用次数: 2

Abstract

A titanium metal organic framework/Titanium dioxide (Ti-MOF/TiO2) composed membrane was fabricated by light inductive growth of Ti-MOF ([Ti2-(TpA)2-NDI]n, TpA=terephthalic acid, NDI=1,8,4,5-naphthalene-tetracarboxdiimide) on a TiO2 film composite optical waveguide (COWG) substrate. Ti-MOF/TiO2 membrane conforms a mesoporous structure with 24 nm of pore size and 108 nm of thick via continuous growth for 40 min under 340 nm UV-light illumination. Under ambient condition, in terms of COWG sensors, Ti-MOF/TiO2 exhibited the greatest response to ethylenediamine (EDA), followed by NO2, methylamine, trimethylamine, when exposed to 15 types of benzenes, amines, and acidic gases. In order to improve response selectivity, Ti-MOF/TiO2 film was modified with 1,3,3-trimethylindolinonaphthospirooxazine (SP) forming SP@Ti-MOF/TiO2 COWG. This modified COWG showed improved selectivity response by showing robust response to EDA and a negligible response to others. When the EDA gas molecule was adsorbed on the surface of the membrane, charge transfer between them preferentially occurred, leading to a change in the optical parameter. The surface-modified SP@Ti-MOF/TiO2 COWG showed a fast (3 s) and reversible response with a wide detection range (0.1-1000 ppb) to EDA gas without the interference of BTXs, acidic gases, and other amines.

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表面改性Ti-MOF/TiO2膜及其气敏特性

通过在TiO2膜复合光波导（COWG）衬底上光诱导生长Ti-MOF（[Ti2-（TpA）2-NDI]n，TpA=对苯二甲酸，NDI=1,8,4,5-萘-四碳酰亚胺），制备了钛金属有机骨架/二氧化钛（Ti-MOF/TiO2）复合膜。Ti-MOF/TiO2膜具有24 孔径为nm和108 通过连续生长40 最低340 nm紫外光照射。在环境条件下，就COWG传感器而言，当暴露于15种类型的苯、胺和酸性气体时，Ti-MOF/TiO2对乙二胺（EDA）表现出最大的响应，其次是NO2、甲胺、三甲胺。为了提高响应选择性，对Ti-MOF/TiO2薄膜进行了1，3，3-三甲基吲哚萘螺恶嗪（SP）改性SP@Ti-MOF/TiO2 COWG。这种修饰的COWG通过对EDA表现出稳健的响应和对其他的可忽略的响应而表现出改进的选择性响应。当EDA气体分子吸附在膜表面时，它们之间优先发生电荷转移，导致光学参数发生变化。表面改性SP@Ti-MOF/TiO2 COWG显示出快速（3 s）具有宽检测范围（0.1-1000 ppb）至EDA气体，而不受BTX、酸性气体和其它胺的干扰。

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来源期刊

Surface Innovations CHEMISTRY, PHYSICALMATERIALS SCIENCE, COAT-MATERIALS SCIENCE, COATINGS & FILMS

CiteScore

5.80

自引率

22.90%

发文量

期刊介绍： The material innovations on surfaces, combined with understanding and manipulation of physics and chemistry of functional surfaces and coatings, have exploded in the past decade at an incredibly rapid pace. Superhydrophobicity, superhydrophlicity, self-cleaning, self-healing, anti-fouling, anti-bacterial, etc., have become important fundamental topics of surface science research community driven by curiosity of physics, chemistry, and biology of interaction phenomenon at surfaces and their enormous potential in practical applications. Materials having controlled-functionality surfaces and coatings are important to the manufacturing of new products for environmental control, liquid manipulation, nanotechnological advances, biomedical engineering, pharmacy, biotechnology, and many others, and are part of the most promising technological innovations of the twenty-first century.