Rapid, Reversible Preparation of Size-Controllable Silver Nanoplates by Chemical Redox

Abstract

Citrate-stabilized silver nanoplates (AgNPs) were prepared using a seed-mediated growth method. The AgNP shape and size were controlled using potassium permanganate (KMnO(4)) as an oxidant and ascorbic acid (AA) as a reductant. Using KMnO(4), 42 nm nanoplates were changed to 22.9 nm nanodisks because of the release of silver ions. Using AA, the oxidized AgNPs were resynthesized to their initial plate form. These results are similar to those obtained using photoinduced shape control of silver nanoparticles; however, the chemical oxidation/reduction method can control the shape of AgNPs, both quantitatively and reversibly. In addition, because of redox-related visible spectral changes, solution color varies with AgNPs size. That feature may be useful in various applications.

Comparison of 20 nm silver nanoparticles synthesized with and without a gold core: Structure, dissolution in cell culture media, and biological impact on macrophages

“…1 A wide variety of synthesis techniques and routes make it possible to produce Ag nanoparticles (AgNPs) of controlled size, shape, and surface functionality optimized for specific applications. [2][3][4][5][6][7][8][9][10][11][12][13] Pure AgNPs (Ag p NPs) grown and structured in a variety of ways 14 are used in many applications, although challenges related to uniformity and stability remain. 15 There is growing interest in AgNPs with Au cores (Ag Au NPs) due to the ability to tune or optimize their optical and catalytic behaviors.…”

Synthesis of Au/Ag nanoframes from Ag nanoplates by galvanic replacement reaction and its optical properties

“…Briefly, (1) the citrate-stabilized AgNP was synthesized according to the previously reported seedmediated method [1]. In previous work [9], the AgNP shape and size were controlled using KMnO 4 as oxidant and ascorbic acid as reductant. (2) The oxidized AgNP with truncated-edge (20 mL) was obtained from partial oxidation of AgNP using 3 mL of 1.2 mM KMnO 4 .…”

Simple Analysis for Interaction between Nanoparticles and Fluorescence Vesicle as a Biomimetic Cell for Toxicological Studies

“…With our reporting method, 15 citrate coated AgNPs were prepared by a dropwise method that added 0.6 mL of 7 mM NaBH 4 (SigmaAldrich) solution to 1 mL of 26 mM AgNO 3 (Sigma-Aldrich) in 19 mL of 1 mM trisodium citrate (Sigma-Aldrich) under vigorous stirring. The color of the solution immediately changed to dark yellow after NaBH 4 was added, which indicated particle formation.…”