BRITTO, D. de

HERRMANN JUNIOR, P. de

STEFFENS, C.

Repository Open Access to Scientific Information from Embrapa

Page 1 of 2Abstract Number: MM3.14 Day I Time: Monday, Nov. 26, 8:00 PM - 11:00 PMChitosan Films as Substrate to Une Patterning Technique of Graphite ( LPTG ) .Application as Sensors.C.Steffens 2; O.de Britto 1; P.d.Herrmann Jr1. 1. Agricultural Instrumentation, Embrapa AgriculturalInstrumentation, Sa o Carlos, Sa o Paulo, Brazil; 2. Food Engineering, Universidade RegionalIntegrada (URI), Erechim, Rio Grande do Sul, Brazil.Flexible and disposable films are important features to develop substrates to Line Patterning Techniqueof graphite (LPTG), with potential application to electronic devices. With this work has been proposingthe use of a chitosan an edible film to be a substrate of the technique. LP is a method that takesadvantage of differing rates of reaction for a material with the printed line on a substrate and the nakedsubstrate surface itself. The technique was originally created on the basis of conductive polymeraqueous dispersions being more readily adhesive to hydrophilic surfaces, such as overheadtransparencies, rather than to hydrophobic surfaces, such as a toner line printed by a laser printer ontoan overhead transparency poly(ethylene teraphtale). In this experiment we are proposing to use abiopolymer from chitosan film as substrate of LPTG. Chitosan is a natural polymer, biodegradable andnon-toxic linear polymer, commercially available by the deacetylation of chitin, an abundantpolysaccharide extracted from the shells of shrimps and crabs. Commercial-grade chitosan andaqueous acetic acid solution (1%) were used to prepare chitosan and alkyl-chitosan derivativeprecursor solutions. Films were then prepared by solution casted onto acrylic an Petri dishes at roomtemperature. After drying the films were peeled from the dishes. The LPTG process consists in printingthe mask on a conventional Laser printer. To make a conductive patterning on to a chitosan film it isnecessary to dip it into the graphite dispersion for 1-2 seconds at room temperature. The aqueousdispersion of graphite (14 (weigth/weigth)) was used. After that it was then dipped into a toluene bath(eg. 200 mL toluene) at room temperature and ultrasonicated for 1 minute, leaving only the graphiteon the film. A interdigitated electrode with four fingers in each side of the device was developed. Themorphology of the chitosan film was studied with the atomic force microscopy (AFM). Images androughness (RMS) were taken, using a Topometrix Oiscoverer TMX 2010 in standard contact mode. Theinfluence of the organic vapor (methanol) in the variation of the electric response (º) was confirmedusing a commercial multimeter. The RMS roughness of the sample, with area image of 400 f-lm2, 100f-lm2, 25 f-lm2 and 1.0 f-lm2 were respectively 44.62nm, 18.99nm, 10.27nm andAbstract ViewerPage 2 of 2Application Design and Programming Copyright ScholarOne, Inc. Ali Rights Reserved. PatentPending.Abstract Viewer

Chitosan films as substrate to line patterning technique of graphite (LPTG) application as sensors.

HERRMANN JUNIOR, P. de.

RCAAP - Repositório Científico de Acesso Aberto de Portugal

http://www.alice.cnptia.embrapa.br/alice/bitstream/doc/31278/1/Proci07.00233.pdf

Chitosan films as substrate to line patterning technique of graphite (LPTG) application as sensors.

Abstract

Similar works

Full text

Available Versions

Repository Open Access to Scientific Information from Embrapa

RCAAP - Repositório Científico de Acesso Aberto de Portugal