One-step green synthesis of gold and silver nanoparticles with ascorbic acid and their versatile surface post-functionalization

Abstract

Gold and silver nanoparticles, with different sizes, have been synthesized using ascorbic acid which allows a versatile and simple post-functionalisation.

Plasmonic‐Based Mechanochromic Microcapsules as Strain Sensors

“…TEM images, histograms, and extinction spectrum of the gold nanoparticles size distributions for monodisperse 40 nm particles and for our new synthetic method can be found in Figures S2–S4 of the Supporting Information. (iii) Decrease of an energy barrier . Malassis et al have shown that bare Au NPs were stable due to the presence of residual negative charges from ascorbic acid at their surface . Above pH = 4, Au NPs appear to be weakly negatively charged (ζ potential ≈ −5 mV) and well dispersed in water showing a sharp plasmon peak (λ ≈ 527 nm) and a red color as shown in the left picture of Figure .…”

“…[41] TEM images, histograms, and extinction spectrum of the gold nanoparticles size distributions for monodisperse 40 nm particles and for our new synthetic method can be found in Figures that bare Au NPs were stable due to the presence of residual negative charges from ascorbic acid at their surface. [44] Above pH = 4, Au NPs appear to be weakly negatively charged (ζ potential ≈ −5 mV) and well dispersed in water showing a sharp plasmon peak (λ≈ 527 nm) and a red color as shown in the left picture of Figure 2. Below pH = 4, Au NPs seem to have no charge (ζ potential ≈ 0 mV) and therefore flocculate forming a blue solution as seen in the right picture of Figure 2 which has a large red-shifted plasmon peak (λ≈ 720 nm).…”

“…However, the most common methods used to synthesize monodisperse 40 nm Au NPs use metal-ion assisted reduction, work at low concentration in gold salt, or require multiple syntheses steps. [41][42][43] Therefore we chose to follow an easier synthesis approach at larger scale, adapted from the method explored by Malassis et al [44] and described in the Experimental Section. This straightforward one-step synthetic method using PVP-DADMAN as an Au NP capping agent led to polydisperse gold nanoparticles measured by transmission electron microscopy (TEM) image analyses.…”

Synthesis of Gold Nanoparticles by Extracellular Components of Lactobacillus casei

“…Ascorbic acid and tartaric acid have shown to act as reductants in the nanoparticle synthesis. [24,25] As these organic acids are mild reductants, the procedure to synthesize AuNPs requires a boiling step, which require energy cost.…”

Separation of Ag(I) by Ion Exchange and Cementation from a Raffinate Containing Ag(I), Ni(II) and Zn(II) and Traces of Cu(II) and Sn(II)

“…In order to synthesize silver powders with micron size, ascorbic acid was added as a reducing agent to the AgNO 3 solution thus obtained and the reduction reaction can be represented as Equation (11) [30,31]. Equation (11) indicates that the reduction of silver ion by ascorbic acid cannot occur in acidic solution.…”