The different water soluble ink-jet inks based on conjugated poly (3,4-ethylenedioxythioph ene):polystyrene sulfonate (PEDOT:PSS) were formulated with various organic co-solvents such as diethylene glycol (DEG), triethylene glycol (TRIEG), tetraethylene glycol (Tetra EG), and polyethylene glycol (PEG) to print on the flexible substrate.The effect of adding various organic co-solvents, which show a same trend of molecular weight, dipole moment and boiling point on the formulated inks properties and ink-jet printed films electrical conductivity, morphology and transparency were investigated.The conductivities of the ink-jet printed films were evaluated by four-point probe conductivity measurement.The morphologies of the printed films have been studied using atomic force microscopy and scanning electron microscopy.The size of PEDOT:PSS particles and the printed film morphology altered by addition of different types of co-solvent in the ink-jet ink formulation.The electrical conductivity of the ink-jet printed film increased by raising the molecular weight, boiling point and dipole moment of used co-solvent in ink-jet ink formulation.
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Atasheh Soleimani‐Gorgani (2018) studied this question.
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