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.

scholarly journals One Step Photochemical Synthesis of Surface-Supported Naked Gold Nanoparticles and Its Application as a SERS Substrate

2021 ◽  
Author(s):  
Pablo A. Mercadal ◽  
Sergio David Garcia Schejtman ◽  
Fernando P. Cometto ◽  
Alicia V. Veglia ◽  
Eduardo A. Coronado
Keyword(s):  
Gold Nanoparticles ◽  
Photochemical Synthesis ◽  
Raman Signal ◽  
Sers Substrate ◽  
Straightforward Method ◽  
Gold Precursor ◽  
One Step ◽  
Supported Gold Nanoparticles ◽  
Supported Gold ◽  
Pulsed Laser Irradiation

<p>A direct and straightforward method is proposed to synthetize a surface-supported gold nanoparticles mediated by pulsed laser irradiation of quartz surfaces in contact with a gold precursor solutions. The substrates´ performance as SERS sensors is tested by the Rhodamine 6G (R6G) Raman signal enhancement.</p>

SERS properties of biogenic gold nanoparticles synthesized using Anemopsis californica extract.

MRS Advances ◽  
2020 ◽  
Vol 5 (63) ◽  
pp. 3397-3406
Author(s):  
R. D. Ávila-Avilés ◽  
Marco A. Camacho-López ◽  
E. Castro-Longoria ◽  
A. Dorazco-González ◽  
N. Hernández-Guerrero ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Raman Signal ◽  
Sers Substrate ◽  
Anemopsis Californica ◽  
Glass Slides ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Biological Methods

AbstractGold nanoparticles (AuNPs) have been classified as one of the most attractive nanotechnologies, thanks to their potential or already implemented applications; therefore, biological methods for their synthesis have been widely investigated. This study explores the synthesis of AuNPs using the extract of Anemopsis californica, and determinates the effect of the solvent used (water, methanol, and isopropanol) to obtain the AuNPs. Biogenic nanoparticles were analysed through UV-Vis spectroscopy and transmission electron microscopy (TEM, HRTEM, and SAED). Significant differences in polydispersity and morphology of AuNPs among the different methods used were found; the aqueous extract and the extract based on methanol formed nanotriangles and polyhedral nanoparticles; the shape of the nanoparticles is predominantly polyhedral when isopropanol is used as the solvent. The as obtained nanoparticles were placed on glass slides to perform Surface-Enhanced Raman Scattering (SERS) experiments, an amplification of the methylene blue Raman signal was observed when triangular nanoparticles cover the biogenic SERS substrate.

scholarly journals One Step Photochemical Synthesis of Surface-Supported Naked Gold Nanoparticles and Its Application as a SERS Substrate

2021 ◽  
Author(s):  
Pablo A. Mercadal ◽  
Sergio David Garcia Schejtman ◽  
Fernando P. Cometto ◽  
Alicia V. Veglia ◽  
Eduardo A. Coronado
Keyword(s):  
Gold Nanoparticles ◽  
Photochemical Synthesis ◽  
Raman Signal ◽  
Sers Substrate ◽  
Straightforward Method ◽  
Gold Precursor ◽  
One Step ◽  
Supported Gold Nanoparticles ◽  
Supported Gold ◽  
Pulsed Laser Irradiation

<p>A direct and straightforward method is proposed to synthetize a surface-supported gold nanoparticles mediated by pulsed laser irradiation of quartz surfaces in contact with a gold precursor solutions. The substrates´ performance as SERS sensors is tested by the Rhodamine 6G (R6G) Raman signal enhancement.</p>

Raman Signal Enhancement by Quasi-Fractal Geometries of Gold Nanoparticles

2018 ◽  
Author(s):  
Richard Darienzo ◽  
Tatsiana Mironava ◽  
Rina Tannenbaum
Keyword(s):  
Gold Nanoparticles ◽  
Surface Plasmon ◽  
Surface Enhanced Raman Spectroscopy ◽  
Synthesis Temperature ◽  
Localized Surface Plasmon ◽  
Raman Signal ◽  
Temperature Modulation ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Nanoparticle Morphology

<div><p>The synthesis of star-like gold nanoparticles (SGNs) in a temperature-controlled environment allows for temperature modulation and facilitates the growth of highly branched nanoparticles. By increasing the synthesis temperature, the level of branching increases as well. These highly branched features represent a distinctly novel, quasi-fractal nanoparticle morphology, referred to herein as gold nano caltrops (GNC). The increased surface roughness, local curvature and degree of inhomogeneity of GNC lend themselves to generating improved enhancement of the scattering signals in surface-enhanced Raman spectroscopy (SERS) via a mechanism in which the localized surface plasmon sites, or “hot spots,” provide the engine for the signal amplification, rather than the more conventional surface plasmon. Here, the synthesis procedure and the surface-enhancing capabilities of GNC are described and discussed in comparison with SGN.</p></div><div><br></div>

Raman Signal Enhancement by Quasi-Fractal Geometries of Gold Nanoparticles

2018 ◽  
Author(s):  
Richard Darienzo ◽  
Tatsiana Mironava ◽  
Rina Tannenbaum
Keyword(s):  
Gold Nanoparticles ◽  
Surface Plasmon ◽  
Surface Enhanced Raman Spectroscopy ◽  
Synthesis Temperature ◽  
Localized Surface Plasmon ◽  
Raman Signal ◽  
Temperature Modulation ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Nanoparticle Morphology

<div><p>The synthesis of star-like gold nanoparticles (SGNs) in a temperature-controlled environment allows for temperature modulation and facilitates the growth of highly branched nanoparticles. By increasing the synthesis temperature, the level of branching increases as well. These highly branched features represent a distinctly novel, quasi-fractal nanoparticle morphology, referred to herein as gold nano caltrops (GNC). The increased surface roughness, local curvature and degree of inhomogeneity of GNC lend themselves to generating improved enhancement of the scattering signals in surface-enhanced Raman spectroscopy (SERS) via a mechanism in which the localized surface plasmon sites, or “hot spots,” provide the engine for the signal amplification, rather than the more conventional surface plasmon. Here, the synthesis procedure and the surface-enhancing capabilities of GNC are described and discussed in comparison with SGN.</p></div><div><br></div>

scholarly journals Food Quality Monitoring Based on Hydrolysis-Induced Au-Catalyzed Heck Cross-Coupling by Ag Metallization

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Sanaz Gholampour ◽  
Hossein Jalali ◽  
Rahele Zhiani ◽  
Hassan Rashidi ◽  
Alireza Motavalizadehkakhky
Keyword(s):  
Gold Nanoparticles ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Blue Shift ◽  
Localized Surface Plasmon ◽  
Core Shell ◽  
Ag Nps ◽  
Au Nps ◽  
X Ray ◽  
Meat Spoilage

Visual detection of meat spoilage was performed based on hydrolysis-induced silver metallization on gold nanoparticles (Au NPs). The hydrolysis of 4-I-benzene-bounded Wang resin was induced by the release of a biogenic amine followed by Au-catalyzed Heck cross-coupling reaction that made silver-coated gold core-shell NPs (Au@Ag) in the presence of Ag ions (Ag metallization). A portable sensory cap was designed by this hypothesis and the successful results were obtained for histamine, trimethylamine, and a spoilage sheep meat. With this protocol, the localized surface plasmon resonance (LSPR) is tuned for absorption of Au NPs and leads to LSPR peak blue shift of gold nanoparticles due to the Ag metallization and the preparation of Au@Ag core-shell NPs. Au NPs and the resulting Au@Ag NPs were characterized by transmission electron microscopy (TEM), BET, ultraviolet-visible (UV-Vis), X-ray diffraction (XRD), energy dispersive X-ray (EDX), and dynamic light scattering (DLS) analyses. Also, various control experiments were set up to credit the portable sensory tube.

Tuning the Localized Surface Plasmon Resonance of Al-Al2O3 Nanosphere Towards NIR Region by Gold Coating

2020 ◽  
Vol 12 ◽  
Author(s):  
Jyoti Katyal ◽  
Shivani Gautam
Keyword(s):  
Electric Field ◽  
Field Distribution ◽  
Dielectric Layer ◽  
Electric Field Distribution ◽  
Active Material ◽  
Visible Region ◽  
Field Enhancement ◽  
Localized Surface Plasmon ◽  
Sers Substrate ◽  
Al Nanoparticles

Background: A relatively narrow LSPR peak and a strong inter band transition ranging around 800 nm makes Al strongly plasmonic active material. Usually, Al nanoparticles are preferred for UV-plasmonic as the SPR of small size Al nanoparticles locates in deep UV-UV region of the optical spectrum. This paper focused on tuning the LSPR of Al nanostructure towards infrared region by coating Au layer. The proposed structure has Au as outer layer which prevent the further oxidation of Al nanostructure. Methods: The Finite Difference Time Domain (FDTD) and Plasmon Hybridization Theory has been used to evaluated the LSPR and field enhancement of single and dimer Al-Al2O3-Au MDM nanostructure. Results: It is observed that the resonance mode show dependence on the thickness of Al2O3 layer and also on the composition of nanostructure. The Au layered MDM nanostructure shows two peak of equal intensities simultaneously in UV and visible region tuned to NIR region. The extinction spectra and electric field distribution profiles of dimer nanoparticles are compared with monomer to reveal the extent of coupling. The dimer configuration shows higher field enhancement ~107 at 1049 nm. By optimizing the thickness of dielectric layer the MDM nanostructure can be used over UV-visible-NIR region. Conclusion: The LSPR peak shows dependence on the thickness of dielectric layer and also on the composition of nanostructure. It has been observed that optimization of size and thickness of dielectric layer can provide two peaks of equal intensities in UV and Visible region which is advantageous for many applications. The electric field distribution profiles of dimer MDM nanostructure enhanced the field by ~107 in visible and NIR region shows its potential towards SERS substrate. The results of this study will provide valuable information for the optimization of LSPR of Al-Al2O3-Au MDM nanostructure to have high field enhancement.

Controllable Electrochemical Synthesis of Ag Hierarchical Micro/Nanostructures with High SERS-Activity

NANO ◽  
2020 ◽  
Vol 15 (04) ◽  
pp. 2050043
Author(s):  
Huayu Zhou ◽  
Jingjing Wang ◽  
Qiong Yang ◽  
Menglei Chen ◽  
Changsheng Song ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Current System ◽  
Three Dimensional ◽  
Constant Current ◽  
Localized Surface Plasmon ◽  
Excitation Wavelength ◽  
Raman Signal ◽  
Mixed Solution ◽  
Raman Enhancement ◽  
One Step

We report a one-step electrochemical deposition technique to prepare three-dimensional (3D) Ag hierarchical micro/nanostructured film consisting of well-crystallized Ag nanosheets grown on an indium tin oxide (ITO) conductive substrate. The Ag hierarchical micro/nanostructures were fabricated in the mixed solution of AgNO3 and sodium citrate in a constant current system at room temperature. Through reduction of Ag[Formula: see text] electrodeposited on the surface of ITO substrate, nanoparticles were grown to form nanosheets which further combined into 3D sphere-like microstructures. The 3D Ag micro/nanostructures have many sharp edges and nanoscale gaps which can give rise to good Raman-enhanced effect. Due to localized surface plasmon resonance (LSPR) effects, these special Ag micro/nanostructures exhibited good Raman-enhanced performance. Using Rhodamine 6G (R6G) molecules as probe molecule, we studied the influence of excitation wavelength on Raman enhancement. The results showed that the 532[Formula: see text]nm excitation wavelength is the best to obtain the strongest Raman signal and to reduce the influence of other impurity peaks. Using the as-synthesized Ag hierarchical micro/nanostructures, we can detect the 10[Formula: see text][Formula: see text]mol/L R6G aqueous solution, exhibiting great Raman-enhanced effect.

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