Chemometric analysis of spectroscopic data on shape evolution of silver nanoparticles induced by hydrogen peroxide

Abstract

The study on the shape evolution of metal nanoparticles (MNPs) is crucial to gain an understanding on controlling the shape and size of metal nanostructures. In this work, a detailed study on shape evolution of silver (Ag) nanospheres to nanoplates induced by hydrogen peroxide (H2O2) was performed. According to the growth mechanism of Ag nanoplates, the spectrophotometric method combined with chemometric analysis has potential to reveal the structural evolution process as observed by surface plasmon resonance phenomena. The extinction spectra of the evolving nanostructures were analyzed by factor analysis and error indicator functions. Five major components attributed to the different particle shapes and sizes were theoretically predicted. Furthermore, the concentration profiles and pure spectra of these components were resolved using multivariate curve resolution-alternative least squares (MCR-ALS) analysis. The evolution profiles show that the spherical Ag particles systematically evolved into plate structures of different sizes. Larger nanoplates were obtained when higher concentrations of H2O2 were employed. An evidence of nanoplate disintegration was observed when a large amount of H2O2 was employed. The predicted structural morphologies of each component given by chemometric calculation were in excellent agreement with those observed by transmission electron microscope (TEM) images.

Enhanced organic solar cell performance: Multiple surface plasmon resonance and incorporation of silver nanodisks into a grating-structure electrode

“…Synthesis of Ag nanodisks Ag NSs and Ag NDs were synthesized according to the previously reported studies 44,51 . First, Ag NSs were synthesized by chemical reduction using NaBH 4 (Merck) as the reductant.…”

“…Moreover, the incorporation of silver nanodisks (Ag NDs) in OSCs has been rarely reported. Ag NDs, which are a type of Ag nanoprisms, have attracted considerable attention due to their extreme degrees of anisotropy, morphologically dependent plasmonic properties, and a wide range of light absorption and light scattering from visible to near-infrared region [42][43][44] . The incorporation of Ag NDs is expected to improve the light absorption, light scattering, and light trapping in OSCs.…”

Colorimetric detection of glutathione based on transverse overgrowth of high aspect ratio gold nanorods investigated by MCR-ALS

“…[68][69][70][71][72][73][74][75] We employed MCR-ALS analysis to investigate the presence of intermediate nanorods species with distinct morphology and spectral characteristics during glutathioneinduced transverse overgrowth on Au NRs. In particular, when the spectroscopic data are coupled to multivariate curve resolution analysis it would be possible to decrypt useful information about the morphology variation as well as kinetic of process.…”

H2O2-Assisted One-pot Synthesis of Silver Nanoplates Using Polymeric Materials

“…Because H 2 O 2 'kills' the less protected isotropic nanoparticles preferentially at the early stage of the synthesis, only the remaining anisotropic nanoparticles grow into larger AgNPLs. 8,9,11,12 In fact, we observed only isotropic spherical nanoparticles (D < 5 nm) without H 2 O 2 (data not shown). Although this mechanistic explanation has not been spectroscopically evidenced, it has been still the most persuasive and rational proposal.…”