A facile synthetic route for the preparation of gold nanostars with magnetic cores and their reusable nanohybrid catalytic properties

Abstract

A facile synthetic route under mild conditions to the preparation of gold nanostars (GNSs) with Fe3O4 cores (Fe3O4@GNSs), possessing magnetization and tunable optical properties from the visible to near-infrared (NIR) region, was developed. Additionally, the resulting Fe3O4@GNSs described here show good catalytic activity for the reduction of potassium ferricyanide as a model reaction. Importantly, the catalyst, Fe3O4@GNSs, can be easily recycled with an external magnet and exhibits long-life, good reusability and stability. We also anticipated that Fe3O4@GNSs may provide a platform for broad potential diagnostic and therapeutic biomedical applications due to its magnetization and tunable optical properties from the visible to NIR region.

Facile Preparation of 2,6‐Pyridinedicarb­oxylic Acid Protected Gold Nanoparticles with Sensitive Chromium‐Ion Sensing and Efficient Catalysis

“…After the addition of NaBH 4 , the intensity of the absorption decreased gradually owing to the formation of K 4 [Fe-(CN) 6 ]. Under the given conditions, [42] 10 μL of PDCAAuNPs solution can catalyze the reduction of K 3 [Fe(CN) 6 ] within seconds, as judged by the rapid disappearance of the characteristic yellow color (Figure 9), whereas the reduction of K 3 [Fe(CN) 6 ] by NaBH 4 without catalyst takes a long period of 12 h. The results indicate the high catalytic activity of the PDCA-AuNPs. …”

“…This work demonstrates that the PDCA-AuNPs have great sensitivity and selectivity for the detection of Cr 3+ ions and also high catalytic activity for the reduction of 4-nitrophenol (4-NP) and K 3 [Fe(CN) 6 ] in aqueous solutions. [41,42] …”

A Facile and Green Synthetic Route for Preparation of Heterostructure Fe3O4@Au Nanocomposites

“…The respective absorption spectra measured for Fe 3 In order to further determine the crystallinity and structure of the nanocomposites, powder X-ray diffraction (XRD) spectrum was utilized. Figure 3 [16]. The maximum magnetization value of the core/shell magnetic NPs was around 10-20 emu/g at room temperature [19].…”

“…However, it also needs high temperature (280 °C) to form the Fe 3 O 4 /Au nanocomposites, and the transfer of the NPs from organic phase to aqueous phase. Miao et al provided a facile route at room temperature in aqueous phase [16], through 11-mercaptoundecanoic acid used as a linker, for preparation of magnetically responsive Fe 3 O 4 @Au. Unfortunately, this method requires tedious washing and sonicating processes as well as long preparation time (over one day).…”

Assumption-free morphological quantification of single anisotropic nanoparticles and aggregates

“…This difference reflects why star-like particles possess such great potential as catalysts: an excellent catalytic activity due to a greater surface-to-volume ratio. 53 In general, with the increasing anisotropic nature of the nanoparticle, its catalytic activity enhances, as shown for platinum 54 and silver 55 NPs.…”