Recently, Ag pastes, instead of indium tin oxide (ITO) thin films, have been generally used for the manufacturing of metal mesh touch sensors make use of screen printing technology. Ag pastes are fabricated by mixing Ag powders with polymer binders, solvents, and other additives such as dispersants,...
Recently, Ag pastes, instead of indium tin oxide (ITO) thin films, have been generally used for the manufacturing of metal mesh touch sensors make use of screen printing technology. Ag pastes are fabricated by mixing Ag powders with polymer binders, solvents, and other additives such as dispersants, curing agents, antifoaming agents, etc. Fine line screen printing of the pastes is used for the formation of patterned electrode lines that can be used for touch panel sensors. The major role of the polymer binders in the Ag paste is to bond the Ag powder at the surface of substrates so that it creates three-dimensional electrically conductive chain structure of Ag powders. Most of the industries, however, use non-conductive polymer binders. In the cases, when a flexible substrate is used, three dimensional networking of the Ag particles could be disconnected which in turn deteriorates electrical properties of the touch sensors. To solve this problem, in this study, an electrically conductive polymer of PEDOT: PSS (Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)) was employed as a polymer binder in Ag paste. It was expected that a complete electrical disconnection might be prevented if the stretchable PEDOT: PSS provides conduction paths under mechanically distorted circumstances of the electrodes and substrates. In this study, the electrical characteristics of the Ag pastes with and without the PEDOT: PSS were compared. Except the PEDOT: PSS, all the other manufacturing conditions of the Ag pastes were identical. Two kinds of Ag nano powders (71 and 308 nm) were used and a relevant amount of binders, solvents, dispersant and additives were used. The mixtures were homogenized using a 3-roll mill. After screen printing the Ag pastes on polyimide (PI) substrates, the electrodes were dried at 100, 150, 200, 250, and 300oC in air. The microstructure of the samples was observed using a scanning electron microscope (6701F, JEOL), and the thickness of the electrodes was determined by the Dektak XT Stylus Profiler (Bruker) using a step method. The 2 probe I-V characterization for the Ag electrodes revealed that the resistivity of the Ag paste containing the PEDOT: PSS was lower than that of the paste without the PEDOT: PSS, each of which was in the order of 10-2~10-4Ω and 10-2Ωcm, respectively. The PEDOT:PSS which provides electrical conduction paths was particularly effective when the substrates were severely bent.
Recently, Ag pastes, instead of indium tin oxide (ITO) thin films, have been generally used for the manufacturing of metal mesh touch sensors make use of screen printing technology. Ag pastes are fabricated by mixing Ag powders with polymer binders, solvents, and other additives such as dispersants, curing agents, antifoaming agents, etc. Fine line screen printing of the pastes is used for the formation of patterned electrode lines that can be used for touch panel sensors. The major role of the polymer binders in the Ag paste is to bond the Ag powder at the surface of substrates so that it creates three-dimensional electrically conductive chain structure of Ag powders. Most of the industries, however, use non-conductive polymer binders. In the cases, when a flexible substrate is used, three dimensional networking of the Ag particles could be disconnected which in turn deteriorates electrical properties of the touch sensors. To solve this problem, in this study, an electrically conductive polymer of PEDOT: PSS (Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)) was employed as a polymer binder in Ag paste. It was expected that a complete electrical disconnection might be prevented if the stretchable PEDOT: PSS provides conduction paths under mechanically distorted circumstances of the electrodes and substrates. In this study, the electrical characteristics of the Ag pastes with and without the PEDOT: PSS were compared. Except the PEDOT: PSS, all the other manufacturing conditions of the Ag pastes were identical. Two kinds of Ag nano powders (71 and 308 nm) were used and a relevant amount of binders, solvents, dispersant and additives were used. The mixtures were homogenized using a 3-roll mill. After screen printing the Ag pastes on polyimide (PI) substrates, the electrodes were dried at 100, 150, 200, 250, and 300oC in air. The microstructure of the samples was observed using a scanning electron microscope (6701F, JEOL), and the thickness of the electrodes was determined by the Dektak XT Stylus Profiler (Bruker) using a step method. The 2 probe I-V characterization for the Ag electrodes revealed that the resistivity of the Ag paste containing the PEDOT: PSS was lower than that of the paste without the PEDOT: PSS, each of which was in the order of 10-2~10-4Ω and 10-2Ωcm, respectively. The PEDOT:PSS which provides electrical conduction paths was particularly effective when the substrates were severely bent.
주제어
#Ag paste conductive polymer PEDOT:PSS metal mesh resistivity
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