Electric-field assisted spatioselective deposition of MIL-101(Cr)_PEDOT to enhance electrical conductivity and humidity sensing performance

Autor(en)

Youven Benseghir, Min Ying Tsang, Flora Schöfbeck, Daniel Hetey, Takashi Kitao, Takashi Uemura, Hidetsugu Shiozawa, Michael R. Reithofer, Jia Min Chin

Abstrakt

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.

Organisation(en)

Institut für Funktionelle Materialien und Katalyse, Elektronische Materialeigenschaften, Institut für Anorganische Chemie

Externe Organisation(en)

University of Tokyo, Czech Academy of Sciences, Vienna Doctoral School in Chemistry

Journal

Journal of Colloid and Interface Science

Band

678

Seiten

979-986

Anzahl der Seiten

8

ISSN

0021-9797

DOI

https://doi.org/10.1016/j.jcis.2024.08.221

Publikationsdatum

01-2025

Peer-reviewed

Ja

ÖFOS 2012

204001 Anorganisch-chemische Technologie, 205004 Funktionsmaterialien, 104017 Physikalische Chemie

Schlagwörter

ASJC Scopus Sachgebiete

Electronic, Optical and Magnetic Materials, Biomaterials, Surfaces, Coatings and Films, Colloid and Surface Chemistry

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/30eb4433-643d-4e30-890c-fcb5e1f338aa