<p>Flexibility, low cost, light weight, easy disposability, biodegradability and foldability are the key features of conducting paper (CP) used in current and future electronics. Achieving uniform conductivity throughout the CP is one of the challenges faced during scaling up and commercialisation of it as an electronic component material. Conducting polymer poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS), the base material along with four different additives such as DMSO, organic additive (glutaraldehyde (GA)), inorganic salt (sodium periodate (NaIO<sub>4</sub>)) and binding agent poly(vinyl alcohol) (PVA) are combined in five different combinations and coated on the paper to tune the conductivity. Double side doctor blade setup fabricated at a cost of less than 2 USD is implemented on dip coated paper to achieve uniform conductivity in the range of 0.07–0.15 S/cm with a SD of less than 1% in the stable current range by controlling the quantity of piece-wise deposition of polymer throughout the spatial expanse. CPs show stable conductivity in the range of 1 µA to 1&#xa0;mA. Conductivity of different samples from a particular CP shows deviation of less than 15% from the mean. CP with GA has the highest conductivity, followed by CP with NaIO<sub>4</sub>. PVA improves binding of polymer onto paper, but reduces the conductivity. Charge carrier mobility and concentration, which are important parameters in the design of electronic devices, are tuned between 4 and 21 cm<sup>2</sup>/V s and 10<sup>17</sup> and 10<sup>19</sup>/cm<sup>3,</sup> respectively. Electrochemical Impedance Analysis shows CPs to be purely resistive with impedance having only magnitude and zero phase.</p>

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Low cost fabrication of electrically tunable and uniform conducting paper for flexible electronics

  • Gayathri Gangadharan,
  • S. Radha,
  • Prita Nair,
  • Jeya Rajendran

摘要

Flexibility, low cost, light weight, easy disposability, biodegradability and foldability are the key features of conducting paper (CP) used in current and future electronics. Achieving uniform conductivity throughout the CP is one of the challenges faced during scaling up and commercialisation of it as an electronic component material. Conducting polymer poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS), the base material along with four different additives such as DMSO, organic additive (glutaraldehyde (GA)), inorganic salt (sodium periodate (NaIO4)) and binding agent poly(vinyl alcohol) (PVA) are combined in five different combinations and coated on the paper to tune the conductivity. Double side doctor blade setup fabricated at a cost of less than 2 USD is implemented on dip coated paper to achieve uniform conductivity in the range of 0.07–0.15 S/cm with a SD of less than 1% in the stable current range by controlling the quantity of piece-wise deposition of polymer throughout the spatial expanse. CPs show stable conductivity in the range of 1 µA to 1 mA. Conductivity of different samples from a particular CP shows deviation of less than 15% from the mean. CP with GA has the highest conductivity, followed by CP with NaIO4. PVA improves binding of polymer onto paper, but reduces the conductivity. Charge carrier mobility and concentration, which are important parameters in the design of electronic devices, are tuned between 4 and 21 cm2/V s and 1017 and 1019/cm3, respectively. Electrochemical Impedance Analysis shows CPs to be purely resistive with impedance having only magnitude and zero phase.