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Metal-Organic Frameworks for Various Sensing Applications

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A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Chemical Sensors".

Deadline for manuscript submissions: closed (31 May 2019) | Viewed by 12781

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Special Issue Editor

Prof. Dr. Ki-Hyun Kim

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Guest Editor

Department of Civil & Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea
Interests: environmental & biomedical monitoring; air quality & environmental engineering; material engineering; coordination polymers; metal-organic frameworks (MOFs)
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

A metal organic framework (MOF) represents a new class of hybrid material built from metal ions with well-defined coordination geometry and organic bridging ligands. Over the past few years, MOFs have attracted a great deal of attention, owing to their intriguing framework architecture, topology, and optical properties. MOFs have provided promising perspectives in various research fields such as catalysis, energy storage, drug delivery systems, nonlinear optics, and gas storage. Recently, the application of MOFs has been further extended to cover new and interesting fields for the sensing of various target components, including small molecules, solvents, pesticides, explosives, and biological markers. In this special issue, I invite contributions from scientists who are actively involved in research related to MOF and sensing principles.

Prof. Dr. Ki-Hyun Kim
Guest Editor

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Keywords

Metal organic frameworks
luminescent
sensing applications
biosensing

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16 pages, 7803 KiB

Open AccessArticle

Luminescent Lanthanide Metal Organic Frameworks as Chemosensing Platforms towards Agrochemicals and Cations

by Germán E. Gomez, María dos Santos Afonso, Héctor A. Baldoni, Federico Roncaroli and Galo J. A. A. Soler-Illia

Sensors 2019, 19(5), 1260; https://doi.org/10.3390/s19051260 - 12 Mar 2019

Cited by 21 | Viewed by 5352

Abstract

Since the first studies of luminescent sensors based on metal organic frameworks (MOFs) about ten years ago, there has been an increased interest in the development of specific sensors towards cations, anions, explosives, small molecules, solvents, etc. However, the detection of toxic compounds related to agro-industry and nuclear activity is noticeably scarce or even non-existent. In this work, we report the synthesis and characterization of luminescent lanthanide-based MOFs (Ln-MOFs) with diverse crystalline architectures obtained by solvothermal methods. The luminescent properties of the lanthanides, and the hypersensitive transitions of Eu³⁺ (⁵D₀→⁷F₂) and Tb³⁺ (⁵D₄→⁷F₅) intrinsically found in the obtained MOFs in particular, were evaluated and employed as chemical sensors for agrochemical and cationic species. The limit of detection (LOD) of Tb-PSA MOFs (PSA = 2-phenylsuccinate) was 2.9 ppm for [UO₂²⁺] and 5.6 ppm for [Cu²⁺]. The variations of the 4f–4f spectral lines and the quenching/enhancement effects of the Ln-MOFs in the presence of the analytes were fully analyzed and discussed in terms of a combinatorial “host–guest” vibrational and “in-silico” interaction studies. Full article

(This article belongs to the Special Issue Metal-Organic Frameworks for Various Sensing Applications)

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19 pages, 9386 KiB

Open AccessArticle

A Low-Power MEMS IDE Capacitor with Integrated Microhotplate: Application as Methanol Sensor using a Metal-Organic Framework Coating as Affinity Layer

by Manjunath R. Venkatesh, Sumit Sachdeva, Brahim El Mansouri, Jia Wei, Andre Bossche, Duco Bosma, Louis C. P. M. de Smet, Ernst J. R. Sudhölter and Guo Qi Zhang

Sensors 2019, 19(4), 888; https://doi.org/10.3390/s19040888 - 20 Feb 2019

Cited by 11 | Viewed by 6441

Abstract

Capacitors made of interdigitated electrodes (IDEs) as a transducer platform for the sensing of volatile organic compounds (VOCs) have advantages due to their lower power operation and fabrication using standard micro-fabrication techniques. Integrating a micro-electromechanical system (MEMS), such as a microhotplate with IDE capacitor, further allows study of the temperature-dependent sensing response of VOCs. In this paper, the design, fabrication, and characterization of a low-power MEMS microhotplate with IDE capacitor to study the temperature-dependent sensing response to methanol using Zeolitic imidazolate framework (ZIF-8), a class of metal-organic framework (MOF), is presented. A Titanium nitride (TiN) microhotplate with aluminum IDEs suspended on a silicon nitride membrane is fabricated and characterized. The power consumption of the ZIF-8 MOF-coated device at an operating temperature of 50

^{\circ}

C is 4.5 mW and at 200

^{\circ}

C it is 26 mW. A calibration methodology for the effects of temperature of the isolation layer between the microhotplate electrodes and the capacitor IDEs is developed. The device coated with ZIF-8 MOF shows a response to methanol in the concentration range of 500 ppm to 7000 ppm. The detection limit of the sensor for methanol vapor at 20

^{\circ}

C is 100 ppm. In situ study of sensing properties of ZIF-8 MOF to methanol in the temperature range from 20

^{\circ}

C to 50

^{\circ}

C using the integrated microhotplate and IDE capacitor is presented. The kinetics of temperature-dependent adsorption and desorption of methanol by ZIF-8 MOF are fitted with double-exponential models. With the increase in temperature from 20

^{\circ}