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Effects of temperature and humidity on DNA-based biopolymers

A. BONEA1,* , I. RĂU2, A. ŢANE2, P. SVASTA1

Affiliation

  1. “Politehnica” University of Bucharest, Center of Technological Electronics and Interconnection Techniques, 060042 Bucharest, Romania
  2. “Politehnica” University of Bucharest, Faculty of Applied Chemistry and Materials Science, 060042 Bucharest, Romania

Abstract

Organic biopolymers such as deoxyribonucleic acid (DNA) and its compounds are attractive materials to be printed into thin films for fabrication of electro-chromic organic electronic devices. This work reports results on the electrical characterization of two DNA compounds obtained using two cationic surfactants cetyltrimethylammonium (CTMA) chloride and benzalkonium (BZK) chloride. The resulted materials are subjected to climatic stress, specifically increased temperature or humidity. Subsequently, the two compounds are doped with a red organic dye, which is known to also influence conductivity, and tested again under climatic stress. In this paper, the resistivity of DNA-CTMA, DNA-BZK, DNA-CTMA-DR and DNA-BZK-DR1, is assessed by current-voltage (I-V) measurements. It results that the four compounds are electrical insulators and that in the case of DNA-CTMA and DNA-CTMA-DR the electrical resistivity is influenced by the concentration of the surfactant. Moreover, the conductivity of the compounds increases significantly when exposed to high relative humidity, but the samples exhibit thermal stability at temperatures as high as 85 Celsius degress and the behavior to thermal stress exposure indicates an ionic conduction..

Keywords

DNA polymers, Thin films, Cationic surfactants, Organic dielectric, Climatic stress.

Submitted at: March 20, 2012
Accepted at: June 6, 2012

Citation

A. BONEA, I. RĂU, A. ŢANE, P. SVASTA, Effects of temperature and humidity on DNA-based biopolymers, Journal of Optoelectronics and Advanced Materials Vol. 14, Iss. 5-6, pp. 511-516 (2012)