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ABSTRACT
With increasing interest on textile-based wearable electronic devices, there exists a critical need for the development of stretchable and elastic conductors directly patternable on a fabric. Although water dispersed PEDOT:PSS have been successfully used in cutaneous applications with biocompatibility, rheological properties need to be modified for direct integration with textile because of its high permeability into the textile. In this work, we report facilely “drop-on-textile” patternable PEDOT:PSS composite ink. Water-based PEDOT:PSS composite ink containing graphene derivative and modified polyurethane was not absorbed after dropping on the linen fabric with high water permeability, which allowed direct patterning of PEDOT:PSS electrode on the fabric. We confirmed that the proposed PEDOT:PSS composite was highly stretchable and showed good bending stability. Interestingly, the resistance of the composite pattern maintained even after repeated washing process with a strong-oxidant-based detergent.
With increasing interest on textile-based wearable electronic devices, there exists a critical need for the development of stretchable and elastic conductors directly patternable on a fabric. Although water dispersed PEDOT:PSS have been successfully used in cutaneous applications with biocompatibility, rheological properties need to be modified for direct integration with textile because of its high permeability into the textile. In this work, we report facilely “drop-on-textile” patternable PEDOT:PSS composite ink. Water-based PEDOT:PSS composite ink containing graphene derivative and modified polyurethane was not absorbed after dropping on the linen fabric with high water permeability, which allowed direct patterning of PEDOT:PSS electrode on the fabric. We confirmed that the proposed PEDOT:PSS composite was highly stretchable and showed good bending stability. Interestingly, the resistance of the composite pattern maintained even after repeated washing process with a strong-oxidant-based detergent.
목차
CONTENTSABSTRACT ?????????????????????????????????????????????????????????????????????????ⅰCONTENTS ?????????????????????????????????????????????????????????????????????????????????????????????ⅱLIST OF FIGURES ???????????????????????????????????????????????????????????????????????????????? iiChapter 1. Introduction ???????????????????????????????????????????????????????????????????????????1Chapter 2. Theoretical Background ???????????????????????????????????????????????????????62. 1. Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) ??????????????????????????????????????????????????????????????????????????6Chapter 3. Experimental Section ????????????????????????????????????????????????????????????83. 1. Materials and preparation ????????????????????????????????????????????????????????????83.1.1. Materials ?????????????????????????????????????????????????????????????????????????????????83.1.2. PEDOT:PSS composite ink fabrication ???????????????????????????????? 93.1.3. Patterning sample preparation ?????????????????????????????????????????????? 93.1.4. Stretching and bending test samples preparation ????????????????? 93.1.5. Wash-resistivity test sample preparation ?????????????????????????????? 103.1.6. Free standing film preparation ?????????????????????????????????????????????? 103. 2. Analysis ??????????????????????????????????????????????????????????????????????????????????????113. 2. 1. Scanning Electron Microscopy (SEM) Measurement?????????113. 2. 2. Surface Tension Measurement ????????????????????????????????????????????113. 2. 3. Viscosity Measurement ??????????????????????????????????????????????????????113. 2. 4. Time-of-Flight secondary ion mass spectrometry (TOF-SIMS) Measurement???????????????????????????????????????????????????????????????123. 2. 5. Transmission Electron Microscopy (TEM) Measurement ????????????????????????????????????????????????????????????????????????????????????????????????123. 2. 6. Differential scanning calorimetry (DSC) Measurement ?????123. 2. 7. Mechanical property????????????????????????????????????????????????????????????133. 3. Electrical performance ????????????????????????????????????????????????????????????????13Chapter 4. Results and Discussion??????????????????????????????????????????????????????????154. 1. Chemical composition of PEDOT:PSS composite ?????????????????????154. 2. Characterization of "Drop-on-textile" PEDOT:PSS composite??184. 2. 1. "Drop-on-textile" PEDOT:PSS composite ??????????????????????????184. 2. 2. Patterning properties????????????????????????????????????????????????????????????244. 3. Rheological properties and Intramolecular interactions of PEDOT:PSS composite???????????????????????????????????????????????????????????274. 3. 1. Surface tension and Viscosity properties ???????????????????????????274. 3. 2. Demonstration of Intramolecular interactions in PEDOT:PSS composite????????????????????????????????????????????????????????????????????????????????????????324. 4. Demonstration of phase separation PEDOT:PSS composite???????394. 4. 1. Demonstration of phase separation using TOF-SIMS??????????394. 4. 2. Phase diagram of PEDOT:PSS composite ink??????????????????????434. 5. Demonstration of PEDOT:PSS composite structure???????????????????474. 6. Electrical properties of PEDOT:PSS composite ?????????????????????????49Chapter 5. Summary ??????????????????????????????????????????????????????????????????????????????60References ????????????????????????????????????????????????????????????????????????????????????????????????62
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