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    Uniaxially Oriented Electrically Conductive Metal-Organic Framework Nanosheets Assembled at Air/Liquid Interfaces

    Year: 2021

    Journal: ACS Appl. Mater. Interfaces, Volume 13, NOV 17, page 54570–54578

    Authors: Ohata, Takashi; Nomoto, Akihiro; Watanabe, Takeshi; Hirosawa, Ichiro; Makita, Tatsuyuki; Takeya, Jun; Makiura, Rie

    Organizations: JSPS KAKENHI [JP19H0571 5, JP16H05968, JP16K13610, JP20H02551, JP21J13884]; Mazda foundation; Masuya Kinen Kenkyu Shinko foundation, Japan; Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [NPS17064]

    Keywords: metal-organic frameworks; nanosheets; electrical conductivity; oriented bottom-up growth; air/liquid interfaces

    Although most metal-organic frameworks (MOFs)-highly porous crystalline metal complex networks with structural and functional varieties-are electrically insulating, high electrical conduction has been recently demonstrated in MOFs while retaining permanent porosity. Usability of electronically active MOFs effectively emerges when they are created in a thin-film state as required in major potential applications such as chemiresistive sensors, supercapacitors, and electrode catalysts. Thin-film morphology including crystallinity, thickness, density, roughness, and orientation sensitively influences device performance. Fine control of such morphological parameters still remains as a main issue to be addressed. Here, we report a bottom-up procedure of assembling a conductive MOF nanosheet composed of 2,3,6,7,10,11-hexaiminotriphenylene molecules and nickel ions (HITP Ni-NS). Creation of HITP Ni-NS is achieved by applying air/liquid (A/L) interfacial bottom-up synthesis. HITP Ni-NS has a multilayered structure with 14 nm thickness and is endowed with high crystallinity and uniaxial orientation, demonstrated by synchrotron X-ray crystallography. Facile transferability of HITP Ni-NS assembled at air/liquid interfaces to any desired substrate enables us to measure its electrical conductivity, recorded as 0.6 S cm(-1)-highest among those of triphenylene-based MOF nanosheets with a thickness lower than 100 nm.
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