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Metal Organic Frameworks (MOFs) for Sensing Applications
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Metal Organic Frameworks (MOFs) for Sensing Applications

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Inorganic Chemistry".

Deadline for manuscript submissions: 30 June 2024 | Viewed by 6419

Special Issue Editor

Dr. Liming Fan

E-Mail Website
Guest Editor
School of Chemistry and Chemical Engineering, North University of China, Taiyuan 030051, China
Interests: construction and functionalization of metal-organic frameworks; the design of luminescent sensor or electrochemicalsensor and their sensing applications

Special Issue Information

Dear Colleagues,

Metal organic frameworks (MOFs) or porous coordination polymers (PCPs) are crystalline materials with periodic networks constructed from the multidentate organic ligands and metal centers through coordination self-assembly. The outstanding structural characteristics of various structures with a high porosity, large specific surface area, and regular and adjustable confined spaces endow themselves a great potential as functional materials. Considering that MOFs not only have built-in organic ligands and metal ion luminescence centers but also can introduce luminescent guest molecules into a confined space through post-synthesis to realize the luminescence function, the applications of luminescence metal organic frameworks (LMOFs) as luminescence sensors or chemosensors are fascinating, especially in the fields of environmental detection and pollutant monitoring. Up to now, LMOFs have been widely used in the detection of heavy metal ions, highly oxidized metal anions, organic small molecules, volatile pollutants, pesticides, biomarkers, etc. Compared with the traditional detection methods, LMOFs show superior advantages of a rapid response, low cost, high sensitivity, and selectivity. Thus, this Special Issue will focus on the topic of metal organic frameworks (MOFs) for sensing applications and devote itself to the dissemination of research into the design of MOF-based luminescent sensors and their luminescent sensing applications. Various advanced studies regarding the exploration of MOF-based sensors will be covered in our Special Issue. Novel and facile strategies to construct MOF-based sensors are also welcome.

The following categories of manuscripts will be considered for publication: full research articles, short communications, reviews, and mini-reviews. Submissions should not have been previously published. All the submissions will be peer-reviewed before acceptance for publication.

Dr. Liming Fan
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • metal-organic framework
  • coordination polymer
  • supramolecular chemistry
  • luminescence sensor
  • chemosensor
  • trace detection

Published Papers (5 papers)

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Research

13 pages, 3513 KiB  
Article
Robust Thiazole-Linked Covalent Organic Frameworks for Water Sensing with High Selectivity and Sensitivity
by Kewei Wang, Zhaoxia Wu, Na Ji, Tingxia Wang, Yongxin Gu, Zhixiang Zhao, Yong Guo, Xiaoyan Wang, Zhifang Jia and Bien Tan
Molecules 2024, 29(7), 1677; https://doi.org/10.3390/molecules29071677 - 08 Apr 2024
Viewed by 550
Abstract
The rational design of covalent organic frameworks (COFs) with hydrochromic properties is of significant value because of the facile and rapid detection of water in diverse fields. In this report, we present a thiazole-linked COF (TZ-COF-6) sensor with a large surface area, ultrahigh [...] Read more.
The rational design of covalent organic frameworks (COFs) with hydrochromic properties is of significant value because of the facile and rapid detection of water in diverse fields. In this report, we present a thiazole-linked COF (TZ-COF-6) sensor with a large surface area, ultrahigh stability, and excellent crystallinity. The sensor was synthesized through a simple three-component reaction involving amine, aldehyde, and sulfur. The thiazole and methoxy groups confer strong basicity to TZ-COF-6 at the nitrogen sites, making them easily protonated reversibly by water. Therefore, TZ-COF-6 displayed color change visible to the naked eye from yellow to red when protonated, along with a red shift in absorption in the ultraviolet-visible diffuse reflectance spectra (UV-vis DRS) when exposed to water. Importantly, the water-sensing process was not affected by polar organic solvents, demonstrating greater selectivity and sensitivity compared to other COF sensors. Therefore, TZ-COF-6 was used to detect trace amounts of water in organic solvents. In strong polar solvents, such as N,N-dimethyl formamide (DMF) and ethanol (EtOH), the limit of detection (LOD) for water was as low as 0.06% and 0.53%, respectively. Even after 8 months of storage and 15 cycles, TZ-COF-6 retained its original crystallinity and detection efficiency, displaying high stability and excellent cycle performance. Full article
(This article belongs to the Special Issue Metal Organic Frameworks (MOFs) for Sensing Applications)
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10 pages, 3656 KiB  
Article
Highly Water-Stable Zinc Based Metal–Organic Framework: Antibacterial, Photocatalytic Degradation and Photoelectric Responses
by Congying Yuan, Yadi Miao, Yinhang Chai, Xiaojun Zhang, Xiaojing Dong and Ying Zhao
Molecules 2023, 28(18), 6662; https://doi.org/10.3390/molecules28186662 - 16 Sep 2023
Cited by 1 | Viewed by 973
Abstract
A reported water-stable Zn-MOF ([Zn(L)2(bpa)(H2O)2]·2H2O, H2L = 5-(2-cyanophenoxy) isophthalic acid has been prepared via a low-cost, general and efficient hydrothermal method. It is worth noting the structural features of Zn-MOF which exhibit the [...] Read more.
A reported water-stable Zn-MOF ([Zn(L)2(bpa)(H2O)2]·2H2O, H2L = 5-(2-cyanophenoxy) isophthalic acid has been prepared via a low-cost, general and efficient hydrothermal method. It is worth noting the structural features of Zn-MOF which exhibit the unsaturated metal site and the main non-covalent interactions including O⋯H, N⋯H and π-π stacking interactions, which lead to strong antibacterial and good tetracycline degradation ability. The average diameter of the Zn-MOF inhibition zone against Escherichia coli and Staphylococcus aureus was 12.22 mm and 10.10 mm, respectively. Further, the water-stable Zn-MOF can be employed as the effective photocatalyst for the photodegradation of tetracycline, achieving results of 67% within 50 min, and it has good cyclic stability. In addition, the photodegradation mechanism was studied using UV-vis diffuse reflection spectroscopy (UV-VIS DRS) and valence-band X-ray photoelectron spectroscopy (VB-XPS) combined with the ESR profile of Zn-MOF, which suggest that ·O2− is the main active species responsible for tetracycline photodegradation. Also, the photoelectric measurement results show that Zn-MOF has a good photocurrent generation performance under light. This provides us with a new perspective to investigate Zn-MOF materials as a suitable multifunctional platform for future environmental improvement applications. Full article
(This article belongs to the Special Issue Metal Organic Frameworks (MOFs) for Sensing Applications)
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14 pages, 2646 KiB  
Article
Heterometallic ZnHoMOF as a Dual-Responsive Luminescence Sensor for Efficient Detection of Hippuric Acid Biomarker and Nitrofuran Antibiotics
by Jingrui Yin, Wenqian Li, Wencui Li, Liying Liu, Dongsheng Zhao, Xin Liu, Tuoping Hu and Liming Fan
Molecules 2023, 28(17), 6274; https://doi.org/10.3390/molecules28176274 - 27 Aug 2023
Cited by 19 | Viewed by 1130
Abstract
Developing efficient and sensitive MOF-based luminescence sensors for bioactive molecule detection is of great significance and remains a challenge. Benefiting from favorable chemical and thermal stability, as well as excellent luminescence performance, a porous Zn(II)Ho(III) heterometallic–organic framework (ZnHoMOF) was selected here as a [...] Read more.
Developing efficient and sensitive MOF-based luminescence sensors for bioactive molecule detection is of great significance and remains a challenge. Benefiting from favorable chemical and thermal stability, as well as excellent luminescence performance, a porous Zn(II)Ho(III) heterometallic–organic framework (ZnHoMOF) was selected here as a bifunctional luminescence sensor for the early diagnosis of a toluene exposure biomarker of hippuric acid (HA) through “turn-on” luminescence enhancing response and the daily monitoring of NFT/NFZ antibiotics through “turn-off” quenching effects in aqueous media with high sensitivity, acceptable selectivity, good anti-interference, exceptional recyclability performance, and low detection limits (LODs) of 0.7 ppm for HA, 0.04 ppm for NFT, and 0.05 ppm for NFZ. Moreover, the developed sensor was employed to quantify HA in diluted urine samples and NFT/NFZ in natural river water with satisfactory results. In addition, the sensing mechanisms of ZnHoMOF as a dual-response chemosensor in efficient detection of HA and NFT/NFZ antibiotics were conducted from the view of photo-induced electron transfer (PET), as well as inner filter effects (IFEs), with the help of time-dependent density functional theory (TD-DFT) and spectral overlap experiments. Full article
(This article belongs to the Special Issue Metal Organic Frameworks (MOFs) for Sensing Applications)
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13 pages, 3408 KiB  
Article
Tunable Non-Enzymatic Glucose Electrochemical Sensing Based on the Ni/Co Bimetallic MOFs
by Qi Wang, Qi Jia, Peng Hu and Liudi Ji
Molecules 2023, 28(15), 5649; https://doi.org/10.3390/molecules28155649 - 26 Jul 2023
Cited by 3 | Viewed by 1127
Abstract
Constructing high-performance glucose sensors is of great significance for the prevention and diagnosis of diabetes, and the key is to develop new sensitive materials. In this paper, a series of Ni2Co1-L MOFs (L = H2BPDC: 4,4′-biphenyldicarboxylic acid; [...] Read more.
Constructing high-performance glucose sensors is of great significance for the prevention and diagnosis of diabetes, and the key is to develop new sensitive materials. In this paper, a series of Ni2Co1-L MOFs (L = H2BPDC: 4,4′-biphenyldicarboxylic acid; H2NDC: 2,6-naphthalenedicarboxylic acid; H2BDC: 1,4-benzenedicarboxylic acid) were synthesized by a room temperature stirring method. The effects of metal centers and ligands on the structure, compositions, electrochemical properties of the obtained Ni2Co1-L MOFs were characterized, indicating the successful preparation of layered MOFs with different sizes, stacking degrees, electrochemical active areas, numbers of exposed active sites, and glucose catalytic activity. Among them, Ni2Co1-BDC exhibits a relatively thin and homogeneous plate-like morphology, and the Ni2Co1-BDC modified glassy carbon electrode (Ni2Co1-BDC/GCE) has the highest electrochemical performance. Furthermore, the mechanism of the enhanced glucose oxidation signal was investigated. It was shown that glucose has a higher electron transfer capacity and a larger apparent catalytic rate constant on the Ni2Co1-BDC/GCE surface. Therefore, tunable non-enzymatic glucose electrochemical sensing was carried out by regulating the metal centers and ligands. As a result, a high-sensitivity enzyme-free glucose sensing platform was successfully constructed based on the Ni2Co1-BDC/GCE, which has a wide linear range of 0.5–2899.5 μM, a low detection limit of 0.29 μM (S/N = 3), and a high sensitivity of 3925.3 μA mM−1 cm−2. Much more importantly, it was also successfully applied to the determination of glucose in human serum with satisfactory results, demonstrating its potential for glucose detection in real samples. Full article
(This article belongs to the Special Issue Metal Organic Frameworks (MOFs) for Sensing Applications)
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15 pages, 5938 KiB  
Article
Ultrasensitive and Simple Dopamine Electrochemical Sensor Based on the Synergistic Effect of Cu-TCPP Frameworks and Graphene Nanosheets
by Liudi Ji, Qi Wang, Xiaqing Gong, Jiamin Chen, Xiaoming Zhu, Zeyu Li and Peng Hu
Molecules 2023, 28(6), 2687; https://doi.org/10.3390/molecules28062687 - 16 Mar 2023
Cited by 2 | Viewed by 1469
Abstract
Dopamine (DA) is an important neurotransmitter. Abnormal concentration of DA can result in many neurological diseases. Developing reliable determination methods for DA is of great significance for the diagnosis and monitoring of neurological diseases. Here, a novel and simple electrochemical sensing platform for [...] Read more.
Dopamine (DA) is an important neurotransmitter. Abnormal concentration of DA can result in many neurological diseases. Developing reliable determination methods for DA is of great significance for the diagnosis and monitoring of neurological diseases. Here, a novel and simple electrochemical sensing platform for quantitative analysis of DA was constructed based on the Cu-TCPP/graphene composite (TCPP: Tetrakis(4-carboxyphenyl)porphyrin). Cu-TCPP frameworks were selected in consideration of their good electrochemical sensing potential. The graphene nanosheets with excellent conductivity were then added to further improve the sensing efficiency and stability of Cu-TCPP frameworks. The electrochemical properties of the Cu-TCPP/graphene composite were characterized, showing its large electrode active area, fast electron transfer, and good sensing performance toward DA. The signal enhancement mechanism of DA was explored. Strong accumulation ability and high electrocatalytic rate were observed on the surface of Cu-TCPP/graphene-modified glassy carbon electrode (Cu-TCPP/graphene/GCE). Based on the synergistic sensitization effect, an ultrasensitive and simple DA electrochemical sensor was developed. The linear range is 0.02–100 and 100–1000 µM, and the detection limit is 3.6 nM for the first linear range. It was also successfully used in detecting DA in serum samples, and a satisfactory recovery was obtained. Full article
(This article belongs to the Special Issue Metal Organic Frameworks (MOFs) for Sensing Applications)
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