Gold nanoparticles decorated rGO-encapsulated metal-organic frameworks composite sensor for the detection of dopamine

2020 ◽  
Author(s):  
Shaoming Yang ◽  
Jian Zhang ◽  
Chaopeng Bai ◽  
Kaiqiang Deng
Keyword(s):  
Gold Nanoparticles ◽  
Modified Electrode ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
High Catalytic Activity ◽  
Practical Applications ◽  
Reduced Graphene ◽  
Morphology And Structure ◽  
Metal Organic ◽  
Composite Sensor

In this study by way of encapsulation of reduced graphene oxide (rGO) into Ni-based metal-organic framework (Ni-MOFs) structure, the composite rGO@Ni-MOFs was first prepared. Then gold nanoparticles (AuNPs) decorated rGO@Ni-MOFs (rGO@Ni-MOFs/AuNPs) was obtained through the electrodeposition. The morphology and structure of rGO@Ni-MOFs/AuNPs were characterized by SEM, FTIR and XRD. The rGO@Ni-MOFs/AuNPs modified electrode was used for the detection of dopamine (DA). The combining the catalysis from Ni-MOFs and AuNPs with the conductivity of rGO endowed rGO@Ni-MOFs/AuNPs with synergetic high catalytic activity to the electrochemical oxidation of DA. The developed modified electrode had a good linear relationship with DA in the concentration range of 0.5 μM～120 μM, and the detection limit was 0.33 μM (S/N=3). Additionally, the potential interferents, electrode stability, reproducibility and practical applications were also studied and satisfactory results were obtained.

Binder-Free mechanochemical metal-organic framework nanocrystal coatings

Nanoscale ◽  
2022 ◽  
Author(s):  
Rijia Lin ◽  
Yuqi Yao ◽  
Muhammad Yazid Bin Zulkifli ◽  
Xuemei Li ◽  
Shuai Gao ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Practical Applications ◽  
Metal Organic ◽  
Binder Free ◽  
Organic Framework

The practical applications of metal-organic frameworks (MOFs) usually require their assembly into mechanically robust structures, usually achieved via coating onto various types of substrates. This paper describes a simple, scalable,...

scholarly journals Construction of Stable Metal-Organic Framework Platforms Embedding N-Heterocyclic Carbene Metal Complexes for Selective Catalysis

2021 ◽  
Author(s):  
Hyunyong Kim ◽  
Hyunseok Kim ◽  
Kimoon Kim ◽  
Eunsung Lee
Keyword(s):  
Metal Complexes ◽  
Metal Organic Framework ◽  
Significant Loss ◽  
High Catalytic Activity ◽  
High Porosity ◽  
Gold Chloride ◽  
Practical Applications ◽  
Metal Organic ◽  
Interpenetrated Structure ◽  
Copper Halides

We report a bottom-up approach to immobilize catalysts into MOFs, including copper halides and gold chloride in a predictable manner. Interestingly, the structures of MOFs bearing NHC metal complexes maintained a similar 4-fold interpenetrated cube. They exhibited exceptionally high porosity despite the interpenetrated structure and showed good stability in various solvents. Moreover, these MOFs possess high size activity depending on the size of the substrates in various reactions, compared to homogeneous catalysis. Also, the high catalytic activity of MOFs can be preserved 4 times without significant loss of crystallinity. Incorporation of the various metal complexes into MOFs allows for the preparation of functional MOFs for practical applications.

Metal organic framework derived Nb2O5@C nanoparticles grown on reduced graphene oxide for high-energy lithium ion capacitors

2019 ◽  
Vol 55 (18) ◽  
pp. 2692-2695 ◽  
Author(s):  
Xinyan Jiao ◽  
Qingli Hao ◽  
Xifeng Xia ◽  
Zongdeng Wu ◽  
Wu Lei
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Lithium Ion ◽  
High Energy ◽  
Reduced Graphene ◽  
Metal Organic ◽  
First Time ◽  
Organic Framework

For the first time, M-Nb2O5@C/rGO composites are fabricated by annealing the precursor of GO supported Nb-metal organic frameworks.

scholarly journals Synthesis of Stable Hierarchical MIL-101(Cr) with Enhanced Catalytic Activity in the Oxidation of Indene

Catalysts ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 394 ◽  
Author(s):  
Tian Zhao ◽  
Ming Dong ◽  
Ling Yang ◽  
Yuejun Liu
Keyword(s):  
Catalytic Activity ◽  
Hierarchical Structure ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Structural Defects ◽  
Controllable Synthesis ◽  
Phenylphosphonic Acid ◽  
Practical Applications ◽  
Metal Organic ◽  
Dye Molecule

Nowadays, the controllable synthesis of stable hierarchical metal–organic frameworks (MOFs) is very important for practical applications, especially in catalysis. Herein, a well-known chromium–benzenedicarboxylate metal–organic framework, MIL-101(Cr), with a stable hierarchical structure, was produced by using phenylphosphonic acid (PPOA) as a modulator via the hydrothermal method. The presence of phenylphosphonic acid could create structural defects and generate larger mesopores. The synthesized hierarchical MIL-101(Cr) possesses relatively good porosity, and the larger mesopores had widths of 4–10 nm. The hierarchical MIL-101(Cr) showed significant improvement for catalytic activity in the oxidation of indene. Further, the presence of a hierarchical structure could largely enhance large dye molecule uptake properties by impregnating.

Oxygen reduction in the nanocage of metal–organic frameworks with an electron transfer mediator

2014 ◽  
Vol 2 (15) ◽  
pp. 5323-5329 ◽  
Author(s):  
Min Jiang ◽  
Liangjun Li ◽  
Dandan Zhu ◽  
Hongyu Zhang ◽  
Xuebo Zhao
Keyword(s):  
Oxygen Reduction ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Porous Metal ◽  
Reduction Reaction ◽  
Carbon Electrode ◽  
Good Electrocatalytic Activity ◽  
Reduced Graphene ◽  
Metal Organic ◽  
Highly Porous

A stable highly porous metal–organic framework (MOF) layer on reduced graphene oxide immobilized glassy carbon electrode shows good electrocatalytic activity for oxygen reduction reaction.

scholarly journals A Sr 2+ -metal–organic framework with high chemical stability: synthesis, crystal structure and photoluminescence property

2017 ◽  
Vol 375 (2084) ◽  
pp. 20160026 ◽  
Author(s):  
Yan-Yuan Jia ◽  
Xiao-Ting Liu ◽  
Wen-He Wang ◽  
Li-Zhu Zhang ◽  
Ying-Hui Zhang ◽  
...  
Keyword(s):  
Chemical Stability ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Photoluminescence Property ◽  
Environment Friendly ◽  
Crystalline Materials ◽  
Practical Applications ◽  
Square Channel ◽  
Metal Organic ◽  
The Stability

Metal–organic frameworks (MOFs) are typically built by assembly of metal centres and organic linkers, and have emerged as promising crystalline materials in a variety of fields. However, the stability of MOFs is a key limitation for their practical applications. Herein, we report a novel Sr 2+ -MOF [Sr 4 (Tdada) 2 (H 2 O) 3 (DMF) 2 ] (denoted as NKU- 105 , NKU = Nankai University; H 4 Tdada = 5,5'-((thiophene-2,5-dicar bonyl)bis(azanediyl))diisophthalic acid; DMF =  N,N -dimethylformamide) featuring an open square channel of about 6 Å along the c -axis. Notably, NKU- 105 exhibits much outstanding chemical stability against common organic solvents, boiling water, acids and bases, relative to most MOF materials. Furthermore, NKU- 105 is an environment-friendly luminescent material with a bright cyan emission. This article is part of the themed issue ‘Coordination polymers and metal–organic frameworks: materials by design’.

scholarly journals Construction of Stable Metal-Organic Framework Platforms Embedding N-Heterocyclic Carbene Metal Complexes for Selective Catalysis

2021 ◽  
Author(s):  
Hyunyong Kim ◽  
Hyunseok Kim ◽  
Kimoon Kim ◽  
Eunsung Lee
Keyword(s):  
Metal Complexes ◽  
Metal Organic Framework ◽  
Significant Loss ◽  
High Catalytic Activity ◽  
High Porosity ◽  
Gold Chloride ◽  
Practical Applications ◽  
Metal Organic ◽  
Interpenetrated Structure ◽  
Copper Halides

We report a bottom-up approach to immobilize catalysts into MOFs, including copper halides and gold chloride in a predictable manner. Interestingly, the structures of MOFs bearing NHC metal complexes maintained a similar 4-fold interpenetrated cube. They exhibited exceptionally high porosity despite the interpenetrated structure and showed good stability in various solvents. Moreover, these MOFs possess high size activity depending on the size of the substrates in various reactions, compared to homogeneous catalysis. Also, the high catalytic activity of MOFs can be preserved 4 times without significant loss of crystallinity. Incorporation of the various metal complexes into MOFs allows for the preparation of functional MOFs for practical applications.

scholarly journals Cytochrome c-multiwalled carbon nanotube and cobalt metal organic framework/gold nanoparticle immobilized electrochemical biosensor for nitrite detection

RSC Advances ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 501-509
Author(s):  
Shan Huang ◽  
Ming Lu ◽  
Lei Wang
Keyword(s):  
Carbon Nanotubes ◽  
Gold Nanoparticles ◽  
Cytochrome C ◽  
Electrochemical Biosensor ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Cobalt Metal ◽  
Multiwalled Carbon ◽  
Metal Organic ◽  
Cyt C

Based on cytochrome c-multiwalled carbon nanotubes (Cyt c-MWCNTs) and cobalt metal organic frameworks/gold nanoparticles (Co-MOFs/AuNPs), an electrochemical biosensor was proposed for the detection of nitrite.

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