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Open AccessArticle

Characterization and Electrical Properties of PVA Films with Self-Assembled Chitosan-AuNPs/SWCNT-COOH Nanostructures

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Departamento de Física, Centro Universitario de Ciencias Exactas e Ingeniería, Universidad de Guadalajara, Blvd. M. García Barragán # 1421, C.P. 44430 Guadalajara, Mexico
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Departamento de Química, Centro Universitario de Ciencias Exactas e Ingeniería, Universidad de Guadalajara, Blvd. M. García Barragán # 1421, C.P. 44430 Guadalajara, Mexico
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Departamento de Ciencias Naturales y Exactas, Centro Universitario de los Valles, Universidad de Guadalajara, Carretera Guadalajara-Ameca Km. 45.5, C.P. 46600 Ameca, Mexico
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Departamento de Ingeniería Química, Centro Universitario de Ciencias Exactas e Ingeniería, Universidad de Guadalajara, Blvd. M. García Barragán # 1421, C.P. 44430 Guadalajara, Mexico
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Departamento de Ciencias Básicas, Centro Universitario de la Ciénega, Universidad de Guadalajara, Avenida Universidad No. 1115, C.P. 47810 Ocotlán, Mexico
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Departamento de Ciencias Tecnológicas, Centro Universitario de la Ciénega, Universidad de Guadalajara, Avenida Universidad No. 1115, C.P. 47810 Ocotlán, Mexico
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Author to whom correspondence should be addressed.
Materials 2020, 13(18), 4138; https://doi.org/10.3390/ma13184138
Received: 31 July 2020 / Revised: 11 September 2020 / Accepted: 14 September 2020 / Published: 17 September 2020
Nanostructured films with electrical conductivity in the semiconductor region were prepared in a polymeric matrix of poly(vinyl alcohol) (PVA) with nanostructures of chitosan-gold nanoparticles (AuNPs)/single-wall carbon nanotubes carboxylic acid functionalized (SWCNT-COOH) (chitosan-AuNPs/SWCNT-COOH) self-assembled. Dispersion light scattering (DLS) was used to determine the average particle sizes of chitosan-AuNPs, z-average particle size (Dz) and number average particle size (Dn), and the formation of crystalline domains of AuNPs was demonstrated by X-ray diffraction (XRD) patterns and observed by means of transmission electron microscopy (TEM). The electrostatic interaction was verified by Fourier transform infrared spectroscopy (FTIR). The electrical conductivity of PVA/chitosan-AuNPs/SWCNT-COOH was determined by the four-point technique and photocurrent. The calculated Dn values of the chitosan-AuNPs decreased as the concentration of gold (III) chloride trihydrate (HAuCl4·3H2O) increased: the concentrations of 0.4 and 1.3 mM were 209 and 90 nm, respectively. Average crystal size (L) and number average size (D) of the AuNPs were calculated in the range of 13 to 24 nm. Electrical conductivity of PVA/chitosan-AuNPs/SWCNT-COOH films was 3.7 × 10−5 σ/cm determined by the four-point technique and 6.5 × 10−4 σ/cm by photocurrent for the SWCNT-COOH concentration of 0.5 wt.% and HAuCl4·3H2O concentration of 0.4 mM. In this investigation, the protonation of the amine group of chitosan is fundamental to prepare PVA films with nanostructures of self-assembled chitosan-AuNPs/SWCNT-COOH. View Full-Text
Keywords: gold nanoparticles; self-assembly; nanostructures; films; electrical properties gold nanoparticles; self-assembly; nanostructures; films; electrical properties
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MDPI and ACS Style

Ceja, I.; González-Íñiguez, K.J.; Carreón-Álvarez, A.; Landazuri, G.; Barrera, A.; Casillas, J.E.; Fernández-Escamilla, V.V.A.; Aguilar, J. Characterization and Electrical Properties of PVA Films with Self-Assembled Chitosan-AuNPs/SWCNT-COOH Nanostructures. Materials 2020, 13, 4138.

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