Novel microporous composites of MOF-5 and polyaniline with high specific surface area

0522864 - ÚMCH 2021 RIV CH eng J - Journal Article
Biserčić, M. S. - Marjanović, B. - Zasońska, Beata Anna - Stojadinović, S. - Ciric-Marjanovic, G.
Novel microporous composites of MOF-5 and polyaniline with high specific surface area.
Synthetic Metals. Roč. 262, April (2020), s. 1-10, č. článku 116348. ISSN 0379-6779. E-ISSN 0379-6779
Institutional support: RVO:61389013
Keywords : composite * conducting polymer * metal organic framework
OECD category: Polymer science
Impact factor: 3.266, year: 2020
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0379677920300448?via%3Dihub

Composites of metal organic framework MOF-5 and conjugated polymer polyaniline (PANI) were synthesized for the first time. Two procedures, which avoid humidity during the synthesis in order to preserve the structure of MOF-5, were applied. In the first one, dissolved part of nonconducting emeraldine base form of PANI (PANI-EB) in N,N΄-dimethylformamide was mixed with MOF-5 in different mass ratios. In the second one, the composites were prepared mechano-chemically, by using powdered conducting emeraldine salt form of PANI (PANI-ES) and solid MOF-5, mixed in chloroform in different mass ratios. The composites were characterized by various techniques: scanning electron microscopy (SEM), FTIR spectroscopy, nitrogen sorption and electrical conductivity measurements, XRD, and flame atomic absorption spectroscopy (FAAS). The procedure which used PANI-EB led to microporous PANI/MOF-5 composites with very high BET specific surface area, SBET (the highest value SBET of c.a. 2700 m2 g−1, even higher than SBET of starting pure MOF-5, showed the composite which contains 89 wt.% of MOF-5) and low conductivity (∼10-7 S cm−1). The second procedure which used PANI-ES gave microporous PANI/MOF-5 composites which showed moderate conductivities (the highest conductivity of 1.0 ⋅ 10−3 S cm-1 exhibited the composite which contains 25 wt.% of MOF-5) and also high SBET values, but lower than those measured for the composites with PANI-EB (the highest SBET of c.a. 850 m2 g-1 showed the composite of PANI doped with HCl which contains c.a. 77 wt.% of MOF-5). XRD measurements confirmed that predominately cubic crystalline structure of MOF-5 was present in almost all composites.
Permanent Link: http://hdl.handle.net/11104/0308162