Controlled Conductive Polymer Coating on Wood Microfibers via Layer-by-layer Nanoassembly
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0920-S03-05
Controlled Conductive Polymer Coating on Wood Microfibers via Layer-by-layer Nanoassembly Mangilal Agarwal, John McDonald, Yuri Lvov, and Kody Varahramyan Institute for Micromanufacturing, Louisiana Tech University, 911 Hergot Ave, Ruston, LA, 71272 ABSTRACT This paper reports on layer-by-layer (LbL) self-assembly of poly (3, 4ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT-PSS) conducting polymer on lignocellulose wood microfibers to make conducting paper. The polycation poly(allylamine hydrochloride) (PAH) was used with polyanionic PEDOT-PSS to construct the multilayers. The physical characterization of the microfiber was done using roughness step tester (RST) and surface profilometer (TENCOR). Thickness of the coated film was estimated using a quartz crystal micro-balance. Current–Voltage characterization was performed using a Keithley measurement system after each selfassembly of PEDOT-PSS layer to study the electrical properties of the coated film. It was observed that the conductivity of the microfiber was proportional to the number of polyelectrolyte bilayers deposited. The measured conductivities ranged from 10-3 Scm-1 to 10 Scm-1 for different bilayers of PEDOT-PSS on wood microfibers. It was also observed that the conductivity of the nano-coated fibers is dependent upon the salt concentration used in PAH polycations to from the multilayer. In this work we are developing scale integration from nano, to micro and macro (nanocoating-microfibersmacropaper). The results obtained show great promise for the development of smart paper technology and its contribution to the economic development of the nation. INTRODUCTION Paper manufacturing is one of the mainstays of American economic infrastructure and paper products influence almost every aspect of business and personal life. From currency to tissue, trees and paper influence our lives. Although, it is said that the electronic media sector is taking over paper industry, the present technology cannot meet the need for paper. Therefore, while there is no significant threat from the electronic sector on the paper industry, it is wise to look for new opportunities to develop new paper-based products with extra functionalities. To fill the many market sector needs, a variety of processes have been developed and introduced for production of pulp, forming sheets [1], and coating paper after it is formed into sheets [2]. The coating processes developed thus far include printability improvements, opacity improvements, smoothness, and strength to name a few. These coating processes share a common property that they apply a coat to the paper substrate after formation of the sheet from the microfibers. In this work, we create electrical conductive wood microfibers that would otherwise be insulating material, by using a systematic layer by layer assembly of polyelectrolyte thin films on cellulose microfibers prior to papermaking process [3-4].
Polyelectrolyte multilayer assemblies, first demonstrated by Iler [5], have been applied in many fields of emerg
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