Scrutiny of Surface Plasmon Resonance Bands of Colloidal Cu and Cu-Ag Nanoparticles in Different Reaction Media for Stability Evaluation

2018 ◽  
Vol 52 ◽  
pp. 115-121
Author(s):  
Aung Chan Thar ◽  
Thaung Hlaing Win ◽  
Nyein Wint Lwin ◽  
Than Zaw Oo
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Chemical Reduction ◽  
Reaction Medium ◽  
Careful Examination ◽  
Metal Nanostructures ◽  
The Stability ◽  
Stability Time ◽  
Reaction Media

The copper nanoparticles (CuNPs) were developed in two different reaction media (distilled water (DW) and ethylene glycol (EG)) by chemical reduction method using two different stabilizers (polyethylene glycol (PEG) and polyvinyl pyrrolidone (PVP)). We carried out a careful examination of the time evolution of surface plasmon resonance (SPR) bands (specifically, peak positions and intensities) of colloidal CuNPs so as to evaluate their stability. In addition, the changing pattern of SPR peak positions and intensities during the stability time period was also investigated. Effects of stabilizer materials, stabilizer concentration, Ag capping and reaction medium on the stability of CuNPs colloids have been highlighted. The maximum stability of CuNPs is 4 hours with stabilizer PEG and is 4 days with PVP in DW. They, with PVP, extend up to 10 days in the different reaction medium (EG). The stability time of CuNPs in EG is further lengthened to 20 days in the presence of Ag capping (Cucore AgshellNPs). Thus a proper selection of the stabilizing/capping agent and the reaction medium is critical in determining the stability of CuNPs colloids. The benefits of stabilization of CuNPs for real world applications are immense and this study would help in examinning the stability of other novel plasmonic metal nanostructures.

scholarly journals Recent Advances of Plasmonic Nanoparticles and their Applications

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1833 ◽  
Author(s):  
Jianxun Liu ◽  
Huilin He ◽  
Dong Xiao ◽  
Shengtao Yin ◽  
Wei Ji ◽  
...  
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Metallic Nanoparticles ◽  
Upconversion Luminescence ◽  
Plasmonic Nanoparticles ◽  
Metal Nanostructures ◽  
Recent Advances ◽  
Past Half Century ◽  
Past Half

In the past half-century, surface plasmon resonance in noble metallic nanoparticles has been an important research subject. Recent advances in the synthesis, assembly, characterization, and theories of traditional and non-traditional metal nanostructures open a new pathway to the kaleidoscopic applications of plasmonics. However, accurate and precise models of plasmon resonance are still challenging, as its characteristics can be affected by multiple factors. We herein summarize the recent advances of plasmonic nanoparticles and their applications, particularly regarding the fundamentals and applications of surface plasmon resonance (SPR) in Au nanoparticles, plasmon-enhanced upconversion luminescence, and plasmonic chiral metasurfaces.

Preparation of Silver Nanoparticles in Water-Alcohol Mediea

2014 ◽  
Vol 809-810 ◽  
pp. 78-81
Author(s):  
Xiao Ning Gao ◽  
Dong Bo Tian ◽  
Jun Long Wang ◽  
Jie Hou ◽  
Yong Jun He ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Surface Plasmon Resonance ◽  
Silver Nitrate ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Alkali Solution ◽  
The Stability ◽  
Water Alcohol

Stable and uniformly dispersive silver nanoparticles were prepared though reducing silver nitrate with polyvinylpyrrolidone. The effects of preparing conditions on the stability of silver nanoparticles were investigated. The results showed that the surface plasmon resonance (SPR) band of the silver nanoparticles was about 403nm. The silver nanoparticles remained stable for more than one month. Water, alkali solution and glucose could accelerate the reaction. The stability of the silver nanoparticles was increased by adding glucose.

Photocatalytic Water Splitting over Ag/TiO2 Nano-Wire Films

2014 ◽  
Vol 665 ◽  
pp. 288-291 ◽  
Author(s):  
Yang Hu ◽  
Chao Pan ◽  
Cai Xia Gao ◽  
Jun Fan ◽  
En Zhou Liu
Keyword(s):  
Surface Plasmon Resonance ◽  
Water Splitting ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Ag Nanoparticles ◽  
Chemical Reduction ◽  
Reduction Process ◽  
Resonance Absorption ◽  
Absorption Properties ◽  
Surface Plasmon Resonance Absorption

Plasmonic Ag decorated TiO2 nano-wire film was firstly prepared by the combination of a hydrothermal method and a microwave-assisted chemical reduction process. The results show that Ag deposited TiO2 film exhibits obvious visible light absorption due to surface plasmon resonance absorption of Ag nanoparticles. Besides, fluorescence quenching is observed in the composite film under the excitation of 250 nm. Photocatalytic tests show that Ag deposited TiO2 exhibits enhanced photocatalytic activity for H2 production by water splitting due to the synergistic effect between charge transfer and surface plasmon resonance absorption properties of Ag nanoparticles.

scholarly journals Two Highly Stable Silver Nanoparticles: Surface Plasmon Resonance Spectra Study of Silver Nanoparticles Capped with m-Hydroxybenzoic Acid and p-Hydroxybenzoic Acid

Molekul ◽  
2018 ◽  
Vol 13 (1) ◽  
pp. 30 ◽  
Author(s):  
Gusrizal Gusrizal ◽  
Sri Juari Santosa ◽  
Eko Sri Kunarti ◽  
Bambang Rusdiarso
Keyword(s):  
Silver Nanoparticles ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Hydroxybenzoic Acid ◽  
Capping Agent ◽  
Long Term Stability ◽  
Yellow Color ◽  
Stability Data ◽  
The Stability

Silver nanoparticles capped with m-hydroxybenzoic acid and p-hydroxybenzoic have been successfully synthesized, but the long-term stability data of these silver nanoparticles are not available. In this paper, we report the stability of these two types of silver nanoparticles for a period of 40 weeks observation based on the change of surface plasmon resonance spectra of silver nanoparticles. Silver nanoparticles were synthesized by reduction of silver nitrate with m-hydroxybenzoic acid and p-hydroxybenzoic acid without addition of capping agent. The presence of silver nanoparticles was indicated by the appearance of yellow color due to the surface plasmon resonance of silver nanoparticles. The resulted silver nanoparticles were stored at room temperature and further UV-visible spectrophotometer was used to follow the change in surface plasmon resonance spectra. The surface plasmon resonance spectra of silver nanoparticles were overlapped for the first 18 weeks, followed by little change in the position of absorption maxima (lmax), peak intensity, and width of the absorption peak until the week of 40. Silver nanoparticles capped with m-hydroxybenzoic acid and silver nanoparticles capped with p-hydroxybenzoic acid were highly stable which should make them suitable for further applications. The results show the potential of m-hydroxybenzoic acid and p-hydroxybenzoic acid to become a new reducing agent in the synthesis of highly stable silver nanoparticles. The m-hydroxybenzoic acid and p-hydroxybenzoic acid appeared to act as both reducing and capping agent.

scholarly journals Enhancing SERS Intensity by Coupling PSPR and LSPR in a Crater Structure with Ag Nanowires

2021 ◽  
Vol 11 (24) ◽  
pp. 11855
Author(s):  
Jae-Hoon Ryu ◽  
Ha Young Lee ◽  
Jeong-Yeon Lee ◽  
Han-Sol Kim ◽  
Sung-Hyun Kim ◽  
...  
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Spray Coating ◽  
Fine Tuning ◽  
Localized Surface Plasmon ◽  
Metal Nanostructures ◽  
Ag Nanowires ◽  
Metal Microstructure ◽  
Sers Intensity

The sensitive characteristics of surface-enhanced Raman scattering (SERS) can be applied to various fields, and this has been of interest to many researchers. Propagating surface plasmon resonance (PSPR) was initially utilized but, recently, it has been studied coupled with localized surface plasmon resonance that occurs in metal nanostructures. In this study, a new type of metal microstructure, named crater, was used for generating PSPR and Ag nanowires (AgNWs) for the generation of LSPR. A crater structure was fabricated on a GaAs (100) wafer using the wet chemical etching method. Then, a metal film was deposited inside the crater, and AgNWs were uniformly coated inside using the spray coating method. Metal films were used to enhance the electromagnetic field when coupled with AgNWs to obtain a high SERS intensity. The SERS intensity measured inside the crater structure with deposited AgNWs was up to 17.4 times higher than that of the flat structure with a deposited Ag film. These results suggest a new method for enhancing the SERS phenomenon, and it is expected that a larger SERS intensity can be obtained by fine-tuning the crater size and diameter and the length of the AgNWs.

Fabrication of sophisticated metal nanostructures for actively tunable plasmonic devices

Impact ◽  
2020 ◽  
Vol 2020 (1) ◽  
pp. 54-56
Author(s):  
Hideyuki Mitomo
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Metal Nanostructures ◽  
Molecular Device ◽  
Fabrication Technique

Metal nanostructures show attractive properties such as surface plasmon resonance. To extend these properties for innovative devices, it is required to develop a fabrication technique for sophisticated metal nanostructures. At the Molecular Device Laboratory at Hokkaido University in Japan, a team of researchers is working on nanotechnology learning from nature to create powerful bio- or nano-devices with manifold applications.

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