Size-controlled syntheses and hydrophilic surface modification of Fe3O4, Ag, and Fe3O4/Ag heterodimer nanocrystals

Abstract

High-quality, monodisperse, and size-controlled Fe(3)O(4), Ag, and bifunctional Fe(3)O(4)/Ag heterodimer nanocrystals (NCs) have been synthesized successfully. In the synthesis of Fe(3)O(4) NCs, dodecanol was chosen as the substitute of 1,2-hexadecanediol and "size control" was achieved by simply adjusting the proportion among the ligands instead of utilizing seed-mediated growth. In the synthesis of Ag NCs, organometallic silver acetylacetonate (Agacac) was used as precursors and tunable particle size could be easily obtained by adjusting the reaction temperatures. By using different sized Fe(3)O(4) NCs as seeds, Fe(3)O(4)/Ag heterodimer NCs with particle sizes tuned from 5 to 16 nm for Fe(3)O(4) and 4 to 8 nm for Ag were successfully synthesized and superparamagnetism were maintained. We found that the size of Ag attached on the Fe(3)O(4) NCs relied on the size of Fe(3)O(4) seed. UV-vis absorption spectra and TEM investigations revealed that the bigger the Fe(3)O(4) NCs seed used, the bigger the Ag NCs that were obtained from the heterodimer NCs. In addition, we demonstrated that all of these NCs were successfully transferred into water by surface modification with biocompatible carboxylic acid groups, which made them meet the basic requirement for biolabeling and biomedical applications.

Preparation, characterization and evaluation of biocomposite films containing chitosan and sago starch impregnated with silver nanoparticles

“…Polymer nanocomposites are advanced functional materials composed of nanoparticles dispersed inside the polymeric matrix [10][11][12][13][14][15], as a result, the produced material combines the suitable properties of both partners [16]. In recent years, the metal nanoparticles/polymer composites have created lot of attraction due to their wide range of applications [17].…”

Synthesis of Vertically Aligned Carbon Nanotubes on Silicalite‐1 Monolayer‐Supported Substrate

“…Figures 2(a) and 2(c) showed low and high magnification HRTEM images of the as-produced Fe 3 O 4 NPs without further size-sorting, respectively. Clear lattice fringes were observed (Figure 2(c)), indicating a single crystalline structure [20]. The distance between the two adjacent planes was ∼2.52Å, which corresponds to the (311) plane of the FCC structured Fe 3 O 4 .…”

Graphene/poly(3,4-ethylenedioxythiophene)/Fe3O4 nanocomposite – An efficient oxygen reduction catalyst for the continuous electricity production from wastewater treatment microbial fuel cells

“…3ii Fig. 3ii(a)), which are ascribed to the (111), (220), (311), (222) (400), (422), (511), (440), (531), (210) and (620) reflection planes (JCPDS-85-1436), respectively [38]. The obtained reflection planes represent the cubic spinel crystal structure of Fe 3 O 4 nanorods [39].…”