Explanation of the size dependent in-plane optical resonance of triangular silver nanoprisms

Abstract

Triangular silver nanoprisms with thicknesses of 3-5 nm and adjustable edge lengths - which can lead to nanoparticles with aspect ratios up to 1 : 50 - are quasi-two-dimensional nanoparticles. Due to high ensemble homogeneities, which are achieved by the application of a microfluid segment based preparation method, the optical properties of the silver nanoprisms can be studied directly in colloidal solution. Investigations of the shift of the longitudinal main absorption peak with varying edge length lead to a semi-empiric model in which inelastic one-photon-one-electron processes are used to explain the found absorption behavior instead of the conventional interpretation of a collective oscillation of the conduction band electrons. Independently of the inserted seed particle volumes or amounts of silver ions, all measurement series follow a linear interrelation between the spectral position of the longitudinal absorption peak and the determined edge length of the nanoprisms, which leads to the derivation of a length constant b0, which in turn can be described within the framework of the model - next to a geometry factor - exclusively by natural constants. The proposed model describes the behavior of quasi-two-dimensional noble metal nanoparticles by a dualism between the assumption of "metallic molecules" and materials with "blurred bandgaps".

Electrostatic Control of Au Nanorod Formation in Automated Microsegmented Flow Synthesis

“…This opened the possibility of recognizing special kinetics in nanoparticle reactions 33 and of interpretations of optical properties of nanoparticles in colloidal solution. 34 These investigations supported also the estimation of the important role of electrostatic effects in particle formation and particle behavior. 35 The crucial effect of particle potential was already detected in the formation of polynuclear metal nanoparticles.…”

“…In the case of high homogeneity, the particles of a colloidal solution can be regarded as a uniform particle species in analogy to molecular species. This opened the possibility of recognizing special kinetics in nanoparticle reactions and of interpretations of optical properties of nanoparticles in colloidal solution . These investigations supported also the estimation of the important role of electrostatic effects in particle formation and particle behavior …”

Single-Photon-Single-Electron Transition for Interpretation of Optical Spectra of Nonspherical Metal Nanoparticles in Aqueous Colloidal Solutions

“…This equation corresponds to the empirically found linear equation for the dependence of the resonance wavelength of triangles from their lateral size [27].…”

Formulation and Evaluation of Miconazole Nitrate Loaded Nanoparticles for Topical Delivery

“…Candidiasis, congenital candidiasis, intertrigo, dermatitis, and dermatophytosis are examples of these infections. Many fungal diseases are treated with oral or parenteral medications, with topical preparations available in limited quantities [15]. Similarly, nanoparticles are presently being developed and tested for oral and parenteral delivery, with just a small amount of research done on topical administration.…”

“…As a result, many strategies for site-specific targeting of these medicines have been published in the literature to address these difficulties. The small size and huge surface area of these nanoparticulate systems enhance absorption at the cellular level, which is a key benefit [15][16][17][18].…”