Precise deposition of metal-organic framework (MOF) materials is important for fabricating high-performing MOF-based devices. Electric-field assisted drop-casting of poly(3,4-ethylenedioxythiophene)-functionalized (PEDOT) MIL-101(Cr) nanoparticles onto interdigitated electrodes allowed their precise spatioselective deposition as percolating nanoparticle chains in the interelectrode gaps. The resulting aligned materials were investigated for resistive and capacitive humidity sensing and compared with unaligned samples prepared via regular drop-casting. The spatioselective deposition of MOFs resulted in up to over 500 times improved conductivity and approximately 6 times increased responsivity during resistive humidity sensing. The aligned samples also showed good capacitive humidity sensing performance, with up to 310 times capacitance gain at 10 versus 90 % relative humidity. In contrast, the resistive behavior of the unaligned samples rendered them unsuitable for capacitive sensing. This work demonstrates that applying an alternating potential during drop-casting is a simple yet effective method to control MOF deposition for greater efficiency, conductivity, and enhanced humidity sensing performance.

Department of Applied Chemistry Graduate School of Engineering The University of Tokyo 7 3 1 Hongo Bunkyo ku Tokyo 113 8656 Japan

Faculty of Physics University of Vienna Boltzmanngasse 5 1090 Vienna Austria; J Heyrovsky Institute of Physical Chemistry Czech Academy of Sciences Dolejskova 3 18223 Prague 8 Czech Republic

Institute of Functional Materials and Catalysis Faculty of Chemistry University of Vienna Währinger Str 42 1090 Vienna Austria

Institute of Functional Materials and Catalysis Faculty of Chemistry University of Vienna Währinger Str 42 1090 Vienna Austria; Vienna Doctoral School in Chemistry University of Vienna Währinger Str 42 1090 Vienna Austria

Institute of Inorganic Chemistry Faculty of Chemistry University of Vienna Währinger Str 42 1090 Vienna Austria

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