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@ARTICLE{Beale:1005166,
      author       = {Beale, Christopher and Altana, Antonio and Hamacher,
                      Stefanie and Yakushenko, Alexey and Mayer, Dirk and Wolfrum,
                      Bernhard and Offenhäusser, Andreas},
      title        = {{I}nkjet printed {T}a2{O}5 on a flexible substrate for
                      capacitive p{H} sensing at high ionic strength},
      journal      = {Sensors and actuators / B},
      volume       = {369},
      issn         = {0925-4005},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2023-01354},
      pages        = {132250},
      year         = {2022},
      abstract     = {Many pH sensors on the market today have specific
                      limitations, such as the large and fragile construction of
                      glass electrodes, or the complicated manufacturing processes
                      of silicon-based devices including ion-sensitive
                      field-effect transistors (ISFETs). Furthermore, most pH
                      sensors require a stable reference electrode, which is
                      difficult to miniaturize. In applications where the solution
                      properties are largely understood, the use of an
                      impedimetric sensor without a reference electrode may be
                      sufficient, thereby simplifying the manufacturing of such
                      sensors. In this work, inkjet printed and flash lamp
                      annealed Ta2O5 on interdigitated electrodes, with an
                      approximate sensor area of 4 mm × 4 mm, is investigated as
                      a capacitive pH sensing layer in 0.5 M alkali chloride
                      buffer solutions. By using the equivalent circuit of the
                      insulator-electrolyte interface, the double layer
                      capacitance is shown to decrease with an increase in pH
                      within the range of pH 2 to pH 9, and agrees with prior
                      results for anodic Ta2O5. When using the device as a sensor
                      in both 0.5 M NaCl and 0.5 M LiCl aqueous solutions, the
                      change in capacitance at 100 Hz is approximately − 110
                      nF/pH. Apart from pH sensing, these results may also prove
                      informative in other applications, such as electrolytic
                      capacitors, electrophysiology, and battery anodes in aqueous
                      electrolyte. Moreover, the use of flexible, gold metallized
                      polyethylene terephthalate (PET) foils as the sensor
                      substrate potentially allows for large-scale production via
                      roll-to-roll manufacturing, and further permits for use of
                      the sensor in flexible applications such as goods
                      packaging.},
      cin          = {IBI-3},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IBI-3-20200312},
      pnm          = {5241 - Molecular Information Processing in Cellular Systems
                      (POF4-524)},
      pid          = {G:(DE-HGF)POF4-5241},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000861551700002},
      doi          = {10.1016/j.snb.2022.132250},
      url          = {https://juser.fz-juelich.de/record/1005166},
}