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de Assis TA, Benito RM, Losada JC, et al. Effect of the local morphology in the field emission properties of conducting polymer surfaces. J Phys Condens Matter. 2013;25(28):285106doi: 10.1088/0953-8984/25/28/285106.
de Assis, T. A., Benito, R. M., Losada, J. C., Andrade, R. F., Miranda, J. G., de Souza, N. C., de Castilho, C. M., Mota, F. d. e. . B., & Borondo, F. (2013). Effect of the local morphology in the field emission properties of conducting polymer surfaces. Journal of physics. Condensed matter : an Institute of Physics journal, 25(28), 285106. https://doi.org/10.1088/0953-8984/25/28/285106
de Assis, T A, et al. "Effect of the local morphology in the field emission properties of conducting polymer surfaces." Journal of physics. Condensed matter : an Institute of Physics journal vol. 25,28 (2013): 285106. doi: https://doi.org/10.1088/0953-8984/25/28/285106
de Assis TA, Benito RM, Losada JC, Andrade RF, Miranda JG, de Souza NC, de Castilho CM, Mota Fde B, Borondo F. Effect of the local morphology in the field emission properties of conducting polymer surfaces. J Phys Condens Matter. 2013 Jul 17;25(28):285106. doi: 10.1088/0953-8984/25/28/285106. Epub 2013 Jun 26. PMID: 23803282.
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J Phys Condens Matter. 2013 Jul 17;25(28):285106. doi: 10.1088/0953-8984/25/28/285106. Epub 2013 Jun 26.

Effect of the local morphology in the field emission properties of conducting polymer surfaces.

Journal of physics. Condensed matter : an Institute of Physics journal

T A de Assis, R M Benito, J C Losada, R F S Andrade, J G V Miranda, Nara C de Souza, C M C de Castilho, F de B Mota, F Borondo

Affiliations

  1. Departamento de Química, Universidad Autónoma de Madrid, Cantoblanco, E-28049 Madrid, Spain. [email protected]

PMID: 23803282 DOI: 10.1088/0953-8984/25/28/285106

Abstract

In this work, we present systematic theoretical evidence of a relationship between the point local roughness exponent (PLRE) (which quantifies the heterogeneity of an irregular surface) and the cold field emission properties (indicated by the local current density and the macroscopic current density) of real polyaniline (PANI) surfaces, considered nowadays as very good candidates in the design of field emission devices. The latter are obtained from atomic force microscopy data. The electric field and potential are calculated in a region bounded by the rough PANI surface and a distant plane, both boundaries held at distinct potential values. We numerically solve Laplace's equation subject to appropriate Dirichlet's condition. Our results show that local roughness reveals the presence of specific sharp emitting spots with a smooth geometry, which are the main ones responsible (but not the only) for the emission efficiency of such surfaces for larger deposition times. Moreover, we have found, with a proper choice of a scale interval encompassing the experimentally measurable average grain length, a highly structured dependence of local current density on PLRE, considering different ticks of PANI surfaces.

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