Anin situSAXS investigation of the formation of silver nanoparticles and bimetallic silver–gold nanoparticles in controlled wet-chemical reduction synthesis

Abstract

In situ investigation of metallic nanoparticle synthesis with an online monitoring of the system by SAXS. Determination of structural parameters and growth processes. Ag-NP synthesis presented a bimodal system with the presence of small particles (∼3 nm).

Promotion of Surgical Masks Antimicrobial Activity by Disinfection and Impregnation with Disinfectant Silver Nanoparticles

“… 30 This interesting observation matches to those observed in our SAED analysis ( Figure 1D ) and agrees with previous reports of AgNPs. 30 , 31 Moreover, according to the TEM results, the size distribution of the AgNPs is 13.2±4 nm showing a narrow size curve, as indicated in Figure 1E . Furthermore, the surface plasmon resonance (SPR) of AgNPs was 405 nm ( Figure 1F ), further following a narrow peak-valley behavior advising a monodispersity distribution 31 and part of the metallic state of Ag° species, 20 in accordance to Figure 1E and D. The DLS proposed that the AgNPs in solution showed a small diameter of 3.5 nm with a stable ZP of −112.2 mV.…”

Determining the morphology and concentration of core–shell Au/Ag nanoparticles

“…The typical example is UV-vis-IR absorbance spectroscopy (AS), ‡ but several groups have shown that small-angle X-ray scattering (SAXS) can also provide valuable information. [6][7][8][9][10] Although the presence of two constituents complicates the application of these methods to bimetallic objects, recent studies point the way towards a deeper understanding of their structure and evolution. 5,11 An important source of progress over the last decade has been the improvement in synthesis protocols, yielding particle populations with better size and shape monodispersity, and allowing the extraction of more information using the various characterization techniques.…”

Microfluidics for Time-Resolved Small-Angle X-Ray Scattering

“…Metal nanoparticle syntheses is particularly amenable to SAXS analysis, as their high electron density contrast allows measurements in dilute suspensions even at the very early stages of particle nucleation. This has been employed for investigating silver (Ag) and gold (Au) nanoparticle formation and structure [28][29][30][31]. The first steps towards microfluidic setups were stopped flow measurements, for example the kinetics of gold nanoparticle formation, and the concurrent evolution of the optical properties of the particle at room and high temperature was very successfully investigated at millisecond resolution with this method by Abécassis et al [32,33] and Chen et al [26].…”