By Hao Jing, Li Zhang, Hui Wang (auth.), Challa Kumar (eds.)
Second quantity of a 40-volume sequence on nanoscience and nanotechnology, edited by way of the popular scientist Challa S.S.R. Kumar. This instruction manual supplies a finished review approximately UV-visible and photoluminescence spectroscopy for the characterization of nanomaterials. sleek functions and cutting-edge options are coated and make this quantity crucial studying for examine scientists in academia and within the comparable fields.
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Additional info for UV-VIS and Photoluminescence Spectroscopy for Nanomaterials Characterization
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They later found out that iodide, the low concentration impurity in CTAB, is the key shape-directing element that inhibits the nanorod growth [106]. Au nanorods can also be conveniently prepared by seedless photochemical growth in the presence of selected surfactants. Yang and coworkers first synthesized uniform Au nanorods with tunable aspect ratios in the range of 1–5 by irradiating gold ions in a micellar solution with a 254-nm ultraviolet light (420 mW/cm2) for $30 h [107]. In analogy to the seed-mediated synthesis, the aspect ratio of the resulting Au nanorods can be controlled through the addition of silver ions using this photochemical approach [107–110].
Known as phase retardation or finite size effects, the immediate impact of increasing particle size beyond the quasi-static limit results in a systematic shifting of the dipole plasmon to lower energies and a significant broadening of the plasmon resonance linewidth. Higher-order multipolar resonances appear as particle size is increased, as distinct spectral features at energies higher than that of the dipolar plasmon energy. Although the dipolar plasmon response of metallic nanoshells has been shown to be remarkably robust in the presence of defects or imperfections in the nanoparticle’s metallic layer, the higher-order modes can be significantly damped by nanoscale surface texturing of the nanoshells [153, 154].
Two important variations of this structure: a semi-shell with multiple perforations in the shell layer and a semi-shell with a wedge-like “slice” in the shell layer were also investigated. A semi-shell with a wedge-like perforation can be thought of as a three-dimensional analog of a split-ring resonator, an important nanoscale component in metamaterial design. 6 Nanorice Nanorice is a hybrid nanoparticle that combines the intense local fields of nanorods with the highly tunable plasmon resonances of nanoshells.