Production of silver nanoparticles by green synthesis using artichoke (Cynara scolymus L.) aqueous extract and measurement of their electrical conductivity

Sandra Sampaio, Julio Viana

Abstract


This work reports the production of silver nanoparticles (AgNP) by a green method using, for the first time, an extract of artichoke (Cynara scolymus L.), and we explore their electrical properties with the aim of using, for the first time, totally green AgNP on the preparation of highly conductive inks. The ultraviolet-visible spectroscopy (UV–Vis) studies confirmed the surface plasmon resonance of green-synthesized silver nanoparticles. Biomolecules of Cynara scolymus L. (CS) extract flower were responsible for reducing and capping of AgNP, which were confirmed by Fourier transformed infrared spectroscopy (FTIR) measurements. Elemental analysis was determined by energy dispersive spectroscopy (EDS). Scanning electron microscope (SEM) studies revealed the formation of spherical and uniformly dispersed silver nanoparticles with size in the range 50–80 nm. The peaks in x-ray diffraction (XRD) pattern are in good match with that of face-centred-cubic form of metallic silver. The purity and thermal stability of the formed AgNP was detected by differential scanning calorimetry-thermal gravimetric analysis (DSC-TGA), the melting point at 973.22°C through this analysis was closely related to bulk metallic silver which indicates its purity. Moreover, the electrical resistivity test, the four probe method, confirmed that the green synthesized AgNP using artichoke flower extract had highly electrical conductivity: the resistivity of AgNP films was of c.a.  5.1 × 10-8 Ω.m after sintering treatment at 100 °C for 30 min, which was about three times that of bulk silver (1.59 × 10-8 Ω.m). Hence, green synthesis can be a prospective way to develop metallic nanoparticles for the preparation of highly conductive inks with low sintering temperature.


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Published by: IOP Publishing and Vietnam Academy of Science and Technology
Frequency: Articles appear online as they are published with print copies published 4 times per year
ISSN: Print: 2043-6254; Online: 2043-6262
DOI Range: 10.1088/issn.2043-6262

© Copyright 2016 Advances in Natural Sciences: Nanoscience and Nanotechnology