Coconut Fiber Sensor for Humidity / Sensor de Fibra de Coco para Humidade

Jorge Henrique Sales, Klezio Darlain E. Santo, Celso C. M. Fornari Jr, G. S. Amarante-Segundo


 In this article we present the construction of a resistive humidity sensor making use of alternative materials of organic origin and source of renewable, coconut fiber. The hygroscopic film is obtained by deposition of the coconut fiber powder combined with carbon powder (graphite) on a substrate of polyester resin with short coconut fiber. Experimental results indicated that the sensor has characteristics expected from a humidity sensor, with adsorption in the time range of 45 seconds and variation in electrical resistance depending on the amount of water molecules in the air.



Polyester resin, Graphite materials, Sensor resistive.


Arai, H. and Seiyama, T. Sensors: A Comprehensive. Survey, VCH, Weinheim, Vol. 3, 1992, pp. 981-1012

Coulson, J. M. and Richardson, J. F., Chemical Engineering, 3ª ed., Pergamon Ed., 1994.

Darlain, K. S.; Sales, J.H; Fornari, C. and Segundo, G S. A.S., Humidity Sensor with Fiber Plant, Encontro de Física 2011, Brazil.

Korvink, J.G.; Chandran, L.; Boutshauser, T; Baltes, H.. Accurate 3D capacitance evaluation in integrated capacitive humidity sensor, Sens. Mater. 4 (6), (1993) 323-335.

Li, D.; Jiang, Y.; Li, Y.; Yang, X.; Lu, L.; Wang, X. Fabrication of a prototype humidity-sensitive capacitor via layer-by-layer self-assembling technique, Mater. Sci. Eng. C 11 (2000) 117 - 119.

Li, Y.; Yang, M.J., Humidity sensitive properties of a novel soluble conjugated copolymer: ethynylbenzene-co-propargyl alcohol, Sens. Actuators B 85 (2002) 73 - 78.

Reitz, J. R; Milford, F. J.; Christy, R. W., Fundamentos da teoria eletromagnética, 30 Ed. Editora Campus, Rio de Janeiro, 1988.

Ricardo, C. P.; Teixeira, A. N., Moléculas biológicas, Didáctica Editora. Lisboa, 280 pp. 1977.

Rosa, M. F., et al, et al, Caracterização do pó da casca de coco verde usado como substrato agrícola, Embrapa Agroindústria Tropical - Comunicado Técnico 54 (2001) 1-6.

Rubinger, C.P.L; C.R. Martins, C.R; De Paoli, M.-A. and Rubinger, R.M, Sulfonated polystyrene polymer humidity sensor: Synthesis and characterization, Sensors and Actuators B 123 (2007) 42 - 49.

Silva, F. C. Manual de análises químicas de solos, plantas e fertilizantes. Embrapa; Comunicação para Transferência de Tecnologia; Embrapa Solos; Embrapa Informática Agropecuária, 1999. 370p.

Smitha, B.; Sridhar, S; Khan, A. A. Synthesis and characterization of proton conducting polymer membranes for fuel cells, J. Membr. Sci. 225 (2003) 63 - 76.

William, J. L., Electric moisture meters for wood. Gen. Tech. Rep. FPL-GTR-6. Madison, WI. U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 1988. 17 p.

Yang, M.J., G. Casalbore - Miceli, N. Camaioni, C.M. Mari, Y. Li, M. Ling, Characterization of capacitive humidity sensors based on doped poly (propargyl-alcohol), J. Appl. Electrochem. 30 (2000) 753 - 756.



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