Electrical and Optical Properties of Self-Assembled, Ordered Gold Nanocrystal/Silica Thin Films Prepared by Sol-Gel Processing

2005 ◽  
Vol 872 ◽  
Author(s):  
Kai Yang ◽  
Hongyou Fan ◽  
Michael J. O'Brien ◽  
Sima La Fontaine ◽  
Gabriel P. Lopez ◽  
...  
Keyword(s):  
Optical Properties ◽  
Surface Plasmon ◽  
Self Assembly ◽  
Sol Gel ◽  
Water Soluble ◽  
Oxide Semiconductor ◽  
Excitation Spectra ◽  
Soluble Silica ◽  
Strong Surface ◽  
Gold Nanocrystal

AbstractHighly ordered gold NC/silica films are synthesized by self-assembly of water-soluble gold nanocrystal micelles and soluble silica using a sol-gel spin-coating technique. The optical properties are analyzed using ellipsometry and ultraviolet-visible spectroscopy. The absorption spectra show a strong surface plasmon absorption band at ∼520 nm for all samples. Angular excitation spectra of the surface plasmon show a steep dip in the reflectivity curve at ∼65°. Charge transport behavior of the films is examined using metal-oxide-semiconductor (MOS) structures.MOS capacitor samples exhibit charge storage with discharge behavior dominated by electron transport within the gold NC arrays.

scholarly journals Colorimetric Analysis on Flocculation of Bioinspired Au Self-Assembly for Biophotonic Application

2009 ◽  
Vol 2009 ◽  
pp. 1-6 ◽  
Author(s):  
Wan-Joong Kim ◽  
JaeTae Seo ◽  
Chil Seong Ah ◽  
Jasmine Austin ◽  
Shanghee Kim ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Optical Properties ◽  
Absorption Spectra ◽  
Surface Plasmon ◽  
Self Assembly ◽  
Colorimetric Analysis ◽  
Physical Origin ◽  
Plasmon Absorption ◽  
Collisional Damping ◽  
Strong Surface

Gold nanoparticles exhibited strong surface plasmon absorption and couplings between neighboring particles within bioactivated self-assembly modified their optical properties. Colorimetric analysis on the optical modification of surface plasmon resoanance (SPR) shift and flocculation parameter functionalized bioinspired gold assembly for biophotonic application. The physical origin of bioinspired gold aggregation-induced shifting, decreasing, or broadening of the plasmon absorption spectra could be explained in terms of dynamic depolarization, collisional damping, and shadowing effects.

Properties of Nanomaterials and Environment

2019 ◽  
pp. 28-43
Author(s):  
Phool Shahzadi
Keyword(s):  
Optical Properties ◽  
Metal Oxides ◽  
Surface Plasmon ◽  
Field Enhancement ◽  
Visible Absorption ◽  
Plasmon Absorption ◽  
Sensor Applications ◽  
Timely Review ◽  
Strong Surface ◽  
Metal Nanomaterials

The chapter provides a timely review of the various properties of nonmaterial and their applications into environmental compartments. An extensive variety of poisonous chemicals is discharged into the environment because of globalization and industrialization. The dimensional, compositional, geometric, and structural properties are fundamental to convey usefulness of the nanomaterials. The controlled sizes and shapes of nanoparticles are anticipated to yield unique catalytic, electrochemical, and photochemical properties. The electrochemical properties of monolayer-functional metal nanoparticles are expected to be controlled by the particle sizes. Metal nanomaterials have interesting optical properties due to strong surface plasmon absorption and field enhancement effects; metal oxides lack visible absorption due to very large bandgap. Nanocomposites have complex optical properties. Nanomaterials present gigantic advantages on diverse applications, catalysis, imaging, biotechnological, and sensor applications due to their improved properties.

scholarly journals Synthesis and Investigation of Thermo-Induced Gelation of Partially Cross-Linked Poly-2-isopropyl-2-oxazoline in Aqueous Media

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 698 ◽  
Author(s):  
Alina Amirova ◽  
Serafim Rodchenko ◽  
Mikhail Kurlykin ◽  
Andrey Tenkovtsev ◽  
Illia Krasnou ◽  
...  
Keyword(s):  
Self Assembly ◽  
Sol Gel ◽  
Aqueous Media ◽  
Water Soluble ◽  
Thermally Induced ◽  
Thermosensitive Gel ◽  
Step Procedure ◽  
Physical Gel ◽  
Sol Gel Transition ◽  
Gel Transition

Water-soluble, partially cross-linked poly-2-isopropyl-2-oxazoline combining the properties of chemical and physical gels was synthesized by a two-step procedure. Thermally induced sol-gel transition in its aqueous solution was studied by rheology, light scattering, and turbidimetry. It was demonstrated that the synthesized product is bimodal; it consists of linear and cross-linked components. The cross-linked components are responsible for the gelation, while the linear ones abate the viscosity growth. Heating the solution above the phase transition temperature leads to the self-assembly of the particles into a physical gel. The combination of chemical and physical cross-linking was found to be a prospective route for thermosensitive gel development.

Properties of Nanomaterials and Environment

2021 ◽  
pp. 89-104
Author(s):  
Phool Shahzadi
Keyword(s):  
Optical Properties ◽  
Metal Oxides ◽  
Surface Plasmon ◽  
Field Enhancement ◽  
Visible Absorption ◽  
Plasmon Absorption ◽  
Sensor Applications ◽  
Timely Review ◽  
Strong Surface ◽  
Metal Nanomaterials

The chapter provides a timely review of the various properties of nonmaterial and their applications into environmental compartments. An extensive variety of poisonous chemicals is discharged into the environment because of globalization and industrialization. The dimensional, compositional, geometric, and structural properties are fundamental to convey usefulness of the nanomaterials. The controlled sizes and shapes of nanoparticles are anticipated to yield unique catalytic, electrochemical, and photochemical properties. The electrochemical properties of monolayer-functional metal nanoparticles are expected to be controlled by the particle sizes. Metal nanomaterials have interesting optical properties due to strong surface plasmon absorption and field enhancement effects; metal oxides lack visible absorption due to very large bandgap. Nanocomposites have complex optical properties. Nanomaterials present gigantic advantages on diverse applications, catalysis, imaging, biotechnological, and sensor applications due to their improved properties.

Tuning Morphology and Fluorescence of Aggregated Nanostructures of Derived Perylene Diimide Molecules

2008 ◽  
Vol 8 (4) ◽  
pp. 2005-2010
Author(s):  
Xiaorong He ◽  
Weidong Zhou ◽  
Yuliang Li ◽  
Xiaofeng Liu ◽  
Cuihong Li ◽  
...  
Keyword(s):  
Optical Properties ◽  
Self Assembly ◽  
Water Soluble ◽  
The Self ◽  
Perylene Diimide ◽  
Confocal Raman Microscopy ◽  
Sem Images ◽  
Confocal Raman ◽  
Chloride Salts ◽  
Scanning Electron

In this paper, we report on the self-assembly of water-soluble N,N′-di(N,N′-dimethyl-dodecane-1,12-diamide)-perylene-3,4,9,10-tetracarboxylic diimide (PDDoAM) in formic acid and chloride salts for producing varied nano-aggregates with different optical properties. Interestingly, the self-assembly can lead to nanocubic, microsheet and “tower-like” nanostructures respectively, as demonstrated by Scanning Electron Microscopy (SEM) images. The optical properties of molecular aggregates were investigated by means of Confocal Raman Microscopy, indicating the morphologies and fluorescence of these nanomaterials are dependent on acids, acid concentrations and casting methods.

Three-Dimensionally Ordered Gold Nanocrystal/Silica Superlattice Thin Films Synthesized via Sol–Gel Self-Assembly

2006 ◽  
Vol 16 (7) ◽  
pp. 891-895 ◽  
Author(s):  
H. Fan ◽  
A. Wright ◽  
J. Gabaldon ◽  
A. Rodriguez ◽  
C. J. Brinker ◽  
...  
Keyword(s):  
Thin Films ◽  
Self Assembly ◽  
Sol Gel ◽  
Gold Nanocrystal

Water-soluble ribbon-like graphitic carbon nitride (g-C3N4): green synthesis, self-assembly and unique optical properties

2014 ◽  
Vol 2 (39) ◽  
pp. 8212-8215 ◽  
Author(s):  
Bo Yuan ◽  
Zengyong Chu ◽  
Gongyi Li ◽  
Zhenhua Jiang ◽  
Tianjiao Hu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Green Synthesis ◽  
Self Assembly ◽  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Water Soluble ◽  
Graphitic Carbon Nitride ◽  
Hard Template

Water-soluble ribbon-like g-C3N4 and various special assemblies were obtained from dicyandiamide using NaCl crystals as a hard template.

Optical properties of sol–gel fabricated Mn/SiO2 nanocomposites: Observation of surface plasmon resonance in Mn nanoparticles

2008 ◽  
Vol 254 (9) ◽  
pp. 2736-2742 ◽  
Author(s):  
Oleg A. Yeshchenko ◽  
Igor M. Dmitruk ◽  
Alexandr A. Alexeenko ◽  
Andriy M. Dmytruk
Keyword(s):  
Optical Properties ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Sol Gel ◽  
Sio2 Nanocomposites

scholarly journals Controlling the Emission Properties of Quantum Rods via Multiscale 3D Ordered Organization

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Thomas Bizien ◽  
Marie Postic ◽  
Pascale Even-Hernandez ◽  
Pascal Panizza ◽  
Cristelle Mériadec ◽  
...  
Keyword(s):  
Optical Properties ◽  
Self Assembly ◽  
Optical Response ◽  
Optically Active ◽  
Water Soluble ◽  
X Ray ◽  
Quantum Rods ◽  
X Ray Scattering ◽  
Optical Electron ◽  
Assembly Behavior

A specific organization of optically active nanoscale objects can greatly affect the optical response of a system. Here, we report the controlled modification of the fluorescent emission by the assembly of water-soluble quantum rods (QRs). Our study combines optical, electron microcopy, and X-ray scattering characterizations to reveal a correlation between the self-assembly behavior of QRs into ordered 3D-arrays and the optical properties (luminescence) of formed assemblies, where the observed optical response is highly dependent on the QR aspect ratio. Specifically, shorter, 18 nm long QRs (QR18), exhibiting a well-defined smectic packing, demonstrate an enhancement of the emission intensity accompanied by a red shift and a lifetime reduction. In contrast, 40 nm long QRs (QR40), forming a columnar phase, does not show these optical properties.

Sign in / Sign up

Export Citation Format

Share Document