Details
| Original language | English |
|---|---|
| Pages (from-to) | 1159-1169 |
| Number of pages | 11 |
| Journal | ChemNanoMat |
| Volume | 5 |
| Issue number | 9 |
| Early online date | 5 Jul 2019 |
| Publication status | Published - 3 Sept 2019 |
Abstract
Highly integrated nanocomposites of Zr-based metal-organic frameworks (MOFs) of the UiO-66 class and multi-wall carbon nanotubes (MWCNTs) are prepared by direct crystallization of MOFs in the presence of CNTs. Powder samples with homogeneously distributed and strongly intergrown nanotubes and nanoparticles are obtained. Growth of the MOFs in the presence of CNTs deposited on glass slides yields open or compact coatings of the nanocomposites. The materials combine the high porosity and versatility of MOFs with the high electrical conductivities of CNTs. Upon increasing the amount of CNTs in the synthesis, the electrical conductivity shows a clear percolation behavior. Even with small amounts of CNTs, high conductivities are observed. SEM and TEM pictures show the strong intergrowth between the CNTs and the MOF nanoparticles. Crystallization times are shorter in the presence of CNTs, and CNTs run centrally through the MOF crystals. These facts indicate that the CNTs serve as heterogeneous nucleation centers for the formation of MOF nanocrystals. Sensing experiments performed on the coatings show significant changes in the electrical conductivities of the nanocomposite materials in the presence of different analytes, which are also discernable from the changes observed on bare CNTs. This is further proof for the close interaction between the components of the nanocomposites.
Keywords
- carbon nanotubes, composites, electrical conductivity, metal-organic frameworks, sensing
ASJC Scopus subject areas
- Materials Science(all)
- Biomaterials
- Energy(all)
- Renewable Energy, Sustainability and the Environment
- Energy(all)
- Energy Engineering and Power Technology
- Materials Science(all)
- Materials Chemistry
Sustainable Development Goals
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: ChemNanoMat, Vol. 5, No. 9, 03.09.2019, p. 1159-1169.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Electrically Conducting Nanocomposites of Carbon Nanotubes and Metal-Organic Frameworks with Strong Interactions between the two Components
AU - Schulze, Hendrik A.
AU - Hoppe, Bastian
AU - Schäfer, Malte
AU - Warwas, Dawid P.
AU - Behrens, Peter
N1 - Funding information: This work profited from funding by the DFG through the Cluster of Excellence EXC 1077 “Hearing4all”. Hendrik A. Schulze thanks the “Studienstiftung des deutschen Volkes” for a fellowship. We also like to thank Katharina Nolte and Dennes Nettelroth for thermogravimetric analysis, Mandy Jahns and Alexander Mohmeyer for physisorption measurements and the Laboratory of Nano and Quantum Engineering (LNQE) for the possibility to perform TEM measurements.
PY - 2019/9/3
Y1 - 2019/9/3
N2 - Highly integrated nanocomposites of Zr-based metal-organic frameworks (MOFs) of the UiO-66 class and multi-wall carbon nanotubes (MWCNTs) are prepared by direct crystallization of MOFs in the presence of CNTs. Powder samples with homogeneously distributed and strongly intergrown nanotubes and nanoparticles are obtained. Growth of the MOFs in the presence of CNTs deposited on glass slides yields open or compact coatings of the nanocomposites. The materials combine the high porosity and versatility of MOFs with the high electrical conductivities of CNTs. Upon increasing the amount of CNTs in the synthesis, the electrical conductivity shows a clear percolation behavior. Even with small amounts of CNTs, high conductivities are observed. SEM and TEM pictures show the strong intergrowth between the CNTs and the MOF nanoparticles. Crystallization times are shorter in the presence of CNTs, and CNTs run centrally through the MOF crystals. These facts indicate that the CNTs serve as heterogeneous nucleation centers for the formation of MOF nanocrystals. Sensing experiments performed on the coatings show significant changes in the electrical conductivities of the nanocomposite materials in the presence of different analytes, which are also discernable from the changes observed on bare CNTs. This is further proof for the close interaction between the components of the nanocomposites.
AB - Highly integrated nanocomposites of Zr-based metal-organic frameworks (MOFs) of the UiO-66 class and multi-wall carbon nanotubes (MWCNTs) are prepared by direct crystallization of MOFs in the presence of CNTs. Powder samples with homogeneously distributed and strongly intergrown nanotubes and nanoparticles are obtained. Growth of the MOFs in the presence of CNTs deposited on glass slides yields open or compact coatings of the nanocomposites. The materials combine the high porosity and versatility of MOFs with the high electrical conductivities of CNTs. Upon increasing the amount of CNTs in the synthesis, the electrical conductivity shows a clear percolation behavior. Even with small amounts of CNTs, high conductivities are observed. SEM and TEM pictures show the strong intergrowth between the CNTs and the MOF nanoparticles. Crystallization times are shorter in the presence of CNTs, and CNTs run centrally through the MOF crystals. These facts indicate that the CNTs serve as heterogeneous nucleation centers for the formation of MOF nanocrystals. Sensing experiments performed on the coatings show significant changes in the electrical conductivities of the nanocomposite materials in the presence of different analytes, which are also discernable from the changes observed on bare CNTs. This is further proof for the close interaction between the components of the nanocomposites.
KW - carbon nanotubes
KW - composites
KW - electrical conductivity
KW - metal-organic frameworks
KW - sensing
UR - http://www.scopus.com/inward/record.url?scp=85068522413&partnerID=8YFLogxK
U2 - 10.1002/cnma.201900110
DO - 10.1002/cnma.201900110
M3 - Article
AN - SCOPUS:85068522413
VL - 5
SP - 1159
EP - 1169
JO - ChemNanoMat
JF - ChemNanoMat
SN - 2199-692X
IS - 9
ER -