The effect of surface ligands on the optical activity of mercury sulfide nanoparticles

Nanoscale ◽  
2017 ◽  
Vol 9 (32) ◽  
pp. 11590-11595 ◽  
Author(s):  
Jumpei Kuno ◽  
Tsuyoshi Kawai ◽  
Takuya Nakashima
Keyword(s):  
Optical Activity ◽  
Chemical Structure ◽  
Chiral Ligands ◽  
Mercury Sulfide ◽  
Surface Ligands ◽  
Effect Of Surface

The optical activity of HgS nanoparticles with a chiral cinnabar phase is dependent on the chemical structure of chiral ligands.

Effect of surface chemistry on bio-conjugation and bio-recognition abilities of 2D germanene materials

Nanoscale ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 1893-1903
Author(s):  
Wei Li Ang ◽  
Jiri Sturala ◽  
Nikolas Antonatos ◽  
Zdeněk Sofer ◽  
Alessandra Bonanni
Keyword(s):  
Surface Chemistry ◽  
Strong Influence ◽  
Intrinsic Fluorescence ◽  
Surface Ligands ◽  
Chemically Modified ◽  
Recognition Efficiency ◽  
Effect Of Surface

The surface ligands on chemically modified germanenes have strong influence on the intrinsic fluorescence, on the bio-conjugation ability and the bio-recognition efficiency of the material towards the detection of a specific analyte.

scholarly journals Optical rotatory power. I—A theoretical calculation for a molecule containing only isotropic refractive centres

1934 ◽  
Vol 144 (853) ◽  
pp. 655-675 ◽  
Keyword(s):  
Theoretical Calculation ◽  
Optical Activity ◽  
Chemical Structure ◽  
Central Atom ◽  
Optical Rotation ◽  
Rotatory Power ◽  
Theoretical Formula ◽  
Optical Rotatory ◽  
Present Communication ◽  
Optical Rotatory Power

Ever since the time of van’t Hoff and Le Bel the number investigations dependent on optical activity, or attempting to elucidate optical activity, has been very great, and it is remarkable that, even at the present time, there is no theoretical formula which gives the relation between the magnitude of the rotation and the chemical structure of the molecule concerned. The present communication supplies this want with regard to the molecule of the simplest asymmetric type: the molecule with four different groups attached to one central atom. Various special hypothese have been postulated to explain optical activity, but a few investigators have shown quite definitely that there is no necessity for any of these hypotheses. Born* and Oseen have shown independently that, if the molecule has a dissymmetric structure, the ordinary refractive properties of the atoms will account for an optical rotation. Gray* and de Mallemann have attempted calculations of formulæ for optical retatory power on this basis. However, it has not been possible to condense the numerous algebraic terms which occur in these calculaations into a compact form.

scholarly journals Effect of surface plasmon resonance on the optical activity of chiral metal nanogratings

2007 ◽  
Vol 15 (15) ◽  
pp. 9575 ◽  
Author(s):  
K. Konishi ◽  
T. Sugimoto ◽  
B. Bai ◽  
Y. Svirko ◽  
M. Kuwata-Gonokami
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Optical Activity ◽  
Plasmon Resonance ◽  
Effect Of Surface

scholarly journals Effect of surface ligands on gold nanocatalysts for CO2 reduction

2020 ◽  
Vol 11 (45) ◽  
pp. 12298-12306
Author(s):  
Hongyu Shang ◽  
Spencer K. Wallentine ◽  
Daniel M. Hofmann ◽  
Quansong Zhu ◽  
Catherine J. Murphy ◽  
...  
Keyword(s):  
Metal Ions ◽  
Au Nanoparticles ◽  
Co2 Reduction ◽  
Permeable Membrane ◽  
Surface Ligands ◽  
Minimal Loss ◽  
Effect Of Surface

Dodecanethiol on Au nanoparticles significantly enhances selectivity and stability with minimal loss in activity by acting as a CO2-permeable membrane, which blocks the deposition of metal ions that are otherwise responsible for rapid deactivation.

scholarly journals Morphology control and optical properties of CdSe nanorods by surface ligands-=SUP=-*-=/SUP=-

2019 ◽  
Vol 45 (16) ◽  
pp. 23
Author(s):  
Zhiyuan Lin ◽  
Jinhua Li ◽  
Ke Feng ◽  
Yue Wang ◽  
Xueying Chu ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Optical Materials ◽  
Crystal Surface ◽  
Crystal Face ◽  
Absorption And Emission ◽  
Surface Ligands ◽  
Optical Stability ◽  
Cdse Nanorod ◽  
Cdse Nanorods ◽  
Effect Of Surface

In this paper, CdSe nanorods were prepared via solvothermal synthesis, the effect of surface ligands on the morphology of nanorods was investigated under the premise by tuning the percentage of surface ligands in the precursors. Experimental results show that the absorption and emission spectrum of CdSe nanorod with different aspect ratio varying from 4:1 to 2:1 have a red-shift, and the aspect ratio gradually decreases as the percentage of tetradecylphosphoric acid (TDPA) in the precursor increases. In addition, the CdSe optical stability improves as the percentage of TDPA increases. It is also shown that the crystal surface, which is not covered by TDPA, has an increased surface energy, which results in rapid growth of the crystal face and the formation of a rod-like structure. As a result, the effects of anisotropic absorption and emission, along the long axis properties can find many applications in the fields of optics, optical materials.

The surface chemistry of iron oxide nanocrystals: surface reduction of γ-Fe2O3 to Fe3O4 by redox-active catechol surface ligands

2018 ◽  
Vol 6 (2) ◽  
pp. 326-333 ◽  
Author(s):  
P. Daniel ◽  
S. I. Shylin ◽  
H. Lu ◽  
M. N. Tahir ◽  
M. Panthöfer ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Iron Oxide ◽  
Surface Chemistry ◽  
Surface Functionalization ◽  
Surface Ligands ◽  
Surface Reduction ◽  
Redox Active ◽  
Structural And Magnetic Properties ◽  
Effect Of Surface

The effect of surface functionalization on the structural and magnetic properties of catechol-functionalized iron oxide magnetic (γ-Fe2O3) nanocrystals was investigated.

Optical anisotropy and sign reversal in layer-by-layer assembled films from chiral nanoparticles

2016 ◽  
Vol 191 ◽  
pp. 141-157 ◽  
Author(s):  
Zhumei Liang ◽  
Kalil Bernardino ◽  
Jishu Han ◽  
Yunlong Zhou ◽  
Kai Sun ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Optical Activity ◽  
Metallic Nanoparticles ◽  
Density Functional ◽  
Structural Changes ◽  
Building Blocks ◽  
Layer By Layer ◽  
Semiconductor Films ◽  
Surface Ligands ◽  
Circular Dichroïsm

Chiral anisotropy and related optical effects at the nanoscale represent some of the most dynamic areas of nanomaterials today. Translation of optical activity of chiral semiconductor and metallic nanoparticles (NPs) into optoelectronic devices requires preparation of thin films from chiral NPs on both flat and curved surfaces. In this paper we demonstrate that chiral NP films can be made via layer-by-layer assembly (LBL) using negatively charged chiral CdS NPs, stabilized by d- and l-cysteine and positively charged polyelectrolytes, as building blocks. LBL coatings from NPs combine simplicity of preparation and strong optical activity. Circular extinction measurements using circular dichroism instruments indicate that the film possess four chiroptical bands at 280, 320, 350, and 390 nm. The latter two bands at 390 and 350 nm are associated with the band gap transitions (chiral excitons), while the former two are attributed to transitions involving surface ligands. When NPs are assembled in LBL films, the rotatory activity and the sign for circular extinction associated with the electronic transition in the inorganic core of the NPs is conserved. However, this is not true for circular extinction bands at short wavelengths: the sign of the rotatory optical activity is reversed. This effect is attributed to the change of the conformation of surface ligands in the polyelectrolyte matrix, which was confirmed both by semi-empirical and density functional (DFT) quantum mechanical calculations. Circular dichroism spectra calculated using a DFT algorithm closely match the experimental spectra of CdS NPs. These findings indicate that the spectroscopic methods sensitive to chirality of the surface ligands can be used to investigate fine structural changes in the surface layer of nanocolloids. Strong rotatory optical activity of nanostructured semiconductor films opens the possibilities for new polarization-based optical devices.

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