scholarly journals Simple synthesis of gold-decorated silica nanoparticles by in situ precipitation method with new plasmonic properties

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
Lizbet León Félix ◽  
Joaquin Martinez Porcel ◽  
Fermín Fidel Herrera Aragón ◽  
David Gregorio Pacheco-Salazar ◽  
Marcelo Henrique Sousa
Keyword(s):  
Surface Plasmon Resonance ◽  
Silica Nanoparticles ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Photothermal Therapy ◽  
Precipitation Method ◽  
Ambient Conditions ◽  
Simple Method ◽  
Potential Applications

AbstractWe describe a simple method for the preparation of gold-decorated silica (SiO2) nanoparticles (NPs) by the in situ precipitation method using simple BH4− ions reduction as a procedure, where BH4− ions are adsorbed onto PEI-functionalized SiO2 NPs for stabilizing and reducing gold ions onto PEI-SiO2 surface in water under ambient conditions. The result was 3-nm gold nanoshell NPs attached to SiO2 core (~ 75 nm) with a surface plasmon resonance (SPR) at ~ 680 nm. SPR band is associated with Au NP aggregates that arise from strong interparticle interaction. This is an alternative to the gold-seeding methods and the use of anionic gold species for the obtention of gold-decorated SiO2 NPs with an important red-shift in UV–Vis absorption and with potential applications in biosensors and photothermal therapy.

scholarly journals Localized surface plasmon resonance in deep ultraviolet region below 200 nm using a nanohemisphere on mirror structure

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kohei Shimanoe ◽  
Soshi Endo ◽  
Tetsuya Matsuyama ◽  
Kenji Wada ◽  
Koichi Okamoto
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Localized Surface Plasmon Resonance ◽  
Localized Surface Plasmon ◽  
Ultraviolet Region ◽  
Simple Method ◽  
Thin Film Layer ◽  
Deep Ultraviolet ◽  
Two Peaks

AbstractLocalized surface plasmon resonance (LSPR) was performed in the deep ultraviolet (UVC) region with Al nanohemisphere structures fabricated by means of a simple method using a combination of vapor deposition, sputtering, and thermal annealing without top-down nanofabrication technology such as electron beam lithography. The LSPR in the UV region was obtained and tuned by the initial metal film thickness, annealing temperature, and dielectric spacer layer thickness. Moreover, we achieved a flexible tuning of the LSPR in a much deeper UVC region below 200 nm using a nanohemisphere on a mirror (NHoM) structure. NHoM is a structure in which a metal nanohemisphere is formed on a metal substrate that is interposed with an Al2O3 thin film layer. In the experimental validation, Al and Ga were used for the metal hemispheres. The LSPR spectrum of the NHoM structures was split into two peaks, and the peak intensities were enhanced and sharpened. The shorter branch of the LSPR peak appeared in the UVC region below 200 nm. Both the peak intensities and linewidth were flexibly tuned by the spacer thickness. This structure can contribute to new developments in the field of deep UV plasmonics.

scholarly journals Design and validation of fiber optic localized surface plasmon resonance sensor for thyroglobulin immunoassay with high sensitivity and rapid detection

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hyeong-Min Kim ◽  
Dae Hong Jeong ◽  
Ho-Young Lee ◽  
Jae-Hyoung Park ◽  
Seung-Ki Lee
Keyword(s):  
Surface Plasmon Resonance ◽  
Optical Fiber ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Localized Surface Plasmon Resonance ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Localized Surface Plasmon ◽  
Simple Method ◽  
Resonance Sensor

AbstractA simple optical fiber sensor based on localized surface plasmon resonance was constructed for direct and rapid measurement of thyroglobulin (Tg). Specific tests for Tg in patients that have undergone thyroidectomy are limited because of insufficient sensitivity, complicated procedures, and in some cases, a long time to yield a result. A sensitive, fast, and simple method is necessary to relieve the psychological and physical burden of the patient. Various concentrations of Tg were measured in a microfluidic channel using an optical fiber sensor with gold nanoparticles. The sensor chip has a detection limit of 93.11 fg/mL with no specificity for other antigens. The potential applicability of the Tg sensing system was evaluated using arbitrary samples containing specific concentrations of Tg. Finally, the sensor can be employed to detect Tg in the patient’s serum, with a good correlation when compared with the commercial kit.

scholarly journals A simple method for quantification of interferon-2b through surface plasmon resonance technique

2010 ◽  
Vol 9 (11) ◽  
pp. 1680-1689 ◽  
Author(s):  
Nagasundara Ramanan Ramakrishnan ◽  
Chuan Ling Tau ◽  
Ti Tey Beng ◽  
B Ariff Arbakariya
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Simple Method ◽  
Resonance Technique

An in situ SERS study of plasmonic nanochemistry based on bifunctional “hedgehog-like” arrays

Nanoscale ◽  
2019 ◽  
Vol 11 (19) ◽  
pp. 9422-9428 ◽  
Author(s):  
Yuduo Guan ◽  
Zengyao Wang ◽  
Panpan Gu ◽  
Yu Wang ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Strong Surface

An in situ SERS study of plasmonic nanochemistry is realized on hierarchical Ag “hedgehog-like” arrays with strong surface plasmon resonance.

Substrate Dependence of Surface Plasmon Resonance Frequency of Silver Island Films

2002 ◽  
Vol 738 ◽  
Author(s):  
Gang Xu ◽  
Masato Tazawa ◽  
Ping Jin
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Size Effects ◽  
Resonance Wavelength ◽  
Simple Method ◽  
Silver Island Films ◽  
Substrate Dependence ◽  
Silver Island ◽  
Island Films

ABSTRACTA simple method was demonstrated to tune surface plasmon resonance wavelength of silver island films by introducing an underlayer. The tunability can be much enhanced by varying the underlayer medium. In combination with the size effects of metallic islands the plasmon wavelength can be readily adjusted throughout the visible spectral regions. The experimental results were interpreted based on a generalized Maxwell-Garnett theory.

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