Direct synthesis of monodispersed thiol-functionalized nanoporous silica spheres and their application to a colloidal crystal embedded with gold nanoparticles

2007 ◽  
Vol 17 (35) ◽  
pp. 3726 ◽  
Author(s):  
Tadashi Nakamura ◽  
Yuri Yamada ◽  
Kazuhisa Yano
Keyword(s):  
Gold Nanoparticles ◽  
Colloidal Crystal ◽  
Direct Synthesis ◽  
Nanoporous Silica ◽  
Silica Spheres

SEM and TEM of Metallic Inverse Opals

2000 ◽  
Vol 6 (S2) ◽  
pp. 70-71
Author(s):  
C.F. Blanford ◽  
H.W. Yan ◽  
A. Stein ◽  
C.B. Carter
Keyword(s):  
Hydrofluoric Acid ◽  
Colloidal Crystal ◽  
Porous Solids ◽  
Wall Structure ◽  
Silica Spheres ◽  
Inverse Opal ◽  
Inverse Opals ◽  
Synthetic Opals ◽  
Monodisperse Spheres ◽  
Polymer Spheres

Drawing on nature, synthetic opals (e.g., gilsonite) consist of uniformly sized ceramic spheres ordered into large close-packed domains. In order to improve the toughness or appearance of these chemically bonded ceramics, a polymer is often infiltrated into the interconnected space between the packed spheres. In a similar fashion, colloidal crystal arrays of submicrometer silica or polymer spheres have been employed as templates for periodic porous solids. All the methods for preparing periodic macroporous materials share a common synthetic thread: first, the colloidal crystals are formed from monodisperse spheres; next, the void spaces are filled and solidified; finally, the template is removed by heat, by refluxing in a solvent such as THF (in the case of polymer spheres), or by soaking in hydrofluoric acid (in the case of silica spheres). The product, which can be thought of as an “inverse opal,” often exhibits the same iridescence as a natural opal due to the similarity between the periodicity of the wall structure and the wavelength of light.

Direct synthesis of amphiphilic polyvinylpyrrolidone-capped gold nanoparticles in chloroform

2020 ◽  
Vol 37 ◽  
pp. 100289 ◽  
Author(s):  
Liudmila Trotsiuk ◽  
Artsiom Antanovich ◽  
Anna Lizunova ◽  
Olga Kulakovich
Keyword(s):  
Gold Nanoparticles ◽  
Direct Synthesis

scholarly journals Deposition of Gold Nanoparticles on Silica Spheres:  A Sonochemical Approach.

2003 ◽  
Vol 15 (17) ◽  
pp. 3402-3402 ◽  
Author(s):  
V. G. Pol ◽  
A. Gedanken ◽  
J. Calderon-Moreno ◽  
V. Palchik ◽  
M. A. Slifkin ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Silica Spheres

Direct synthesis and stabilization of Bi-sized cysteine-derived gold nanoparticles: Reduction catalyst for methylene blue

2011 ◽  
Vol 8 (S1) ◽  
pp. S34-S43 ◽  
Author(s):  
Sirajuddin ◽  
A. Nafady ◽  
H. I. Afridi ◽  
S. Sara ◽  
A. Shah ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Gold Nanoparticles ◽  
Direct Synthesis

Deposition of Gold Nanoparticles on Silica Spheres: A Sonochemical Approach.

ChemInform ◽  
2003 ◽  
Vol 34 (22) ◽  
Author(s):  
V. G. Pol ◽  
A. Gedanken ◽  
J. Calderon-Moreno
Keyword(s):  
Gold Nanoparticles ◽  
Silica Spheres

Opal-Type Photonic Crystals: Fabrication and Application

2010 ◽  
Vol 71 ◽  
pp. 50-57 ◽  
Author(s):  
Andrea Chiappini ◽  
Guillaume Alombert-Goget ◽  
Cristina Armellini ◽  
Simone Berneschi ◽  
Brigitte Boulard ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Colloidal Crystal ◽  
Photonic Band Gap ◽  
Blue Shift ◽  
Optical Measurements ◽  
Localized Surface Plasmon ◽  
Raman Signal ◽  
Sers Substrate ◽  
Silica Network ◽  
Elastomeric Matrix

We report on fabrication and characterization of two different opal-like structures: (i) crystal exhibiting mechanochromism, i.e. change of colour when subjected to mechanical stress, composed of closely packed colloidal polystyrene particles (CPCP) embedded in a poly-dimethylsiloxane (PDMS) elastomeric matrix; (ii) metallo-dielectric systems (MDCS), based on the realization of inverse silica opal and following attachment of gold nanoparticles on the silica network of the inverse colloidal structure. Optical measurements, performed on the two structures, have demonstrated that: (i) when an horizontal strain is applied on the CPCP embedded in PDMS, a blue shift of the diffraction peak occurs as a function of the applied strain and (ii) MDCS have unique optical properties that combine the localized surface plasmon resonance (LSPR) of gold nanoparticles (Au NPs) with the photonic band gap features of colloidal crystal structures. Finally, preliminary results on MDCS used as SERS substrate evidence a higher increase of the Raman signal in respect to that observed for others metallic structures.

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