Microwave-assisted one-pot synthesis of anisotropic gold nanoparticles with active high-energy facets for enhanced catalytic and metal enhanced fluorescence activities

CrystEngComm ◽  
2018 ◽  
Vol 20 (30) ◽  
pp. 4297-4304 ◽  
Author(s):  
N. V. S. Praneeth ◽  
Santanu Paria
Keyword(s):  
Gold Nanoparticles ◽  
Au Nanoparticles ◽  
High Energy ◽  
Enhanced Fluorescence ◽  
Rhombic Dodecahedron ◽  
Metal Enhanced Fluorescence ◽  
One Pot ◽  
Microwave Assisted ◽  
Green Route ◽  
Anisotropic Gold Nanoparticles

Rhombic dodecahedron Au nanoparticles synthesized via a microwave assisted green route with high energy {110} facets are highly efficient for catalysis and metal enhanced fluorescence activities.

Sensitive Hg2+ Ion Detection Using Metal Enhanced Fluorescence of Novel Polyvinyl Pyrrolidone (PVP)-Templated Gold Nanoparticles

2018 ◽  
Vol 72 (11) ◽  
pp. 1645-1652 ◽  
Author(s):  
Kailong Dong ◽  
Jiasheng Zhou ◽  
Taiqun Yang ◽  
Shan Dai ◽  
Hao Tan ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Detection Limit ◽  
Au Nanoparticles ◽  
Polyvinyl Pyrrolidone ◽  
Quenching Mechanism ◽  
Ion Detection ◽  
Enhanced Fluorescence ◽  
Metal Enhanced Fluorescence ◽  
One Pot ◽  
Au Nps

In this study, we report a straightforward strategy for Hg2+ ion detection. Fluorescent Au nanoparticles (NPs) were one-pot synthesized using a polymer (polyvinyl pyrrolidone [PVP]) as both capping and fluorescence agent. The as-synthesized PVP-Au NPs showed a remarkably rapid response selectively for Hg2+ ions compared to 14 other metal ions. The detection limit of Hg2+ was estimated at 100 nM. We discuss the emission and quenching mechanism of the PVP-Au NPs, the former being attributed to metal enhanced fluorescence and the latter being related to static quenching by Hg2+. The fluorescence of PVP-Au NPs offers an efficient and reliable strategy for Hg2+ ions detection. They therefore have a great potential for applications in health and environmental monitoring.

scholarly journals Comparison of electrocatalytic activity for glucose electrooxidation of gold nanoparticles fabricated by different methods

Chemija ◽  
2019 ◽  
Vol 30 (1) ◽  
Author(s):  
Daina Upskuvienė ◽  
Aldona Balčiūnaitė ◽  
Jūratė Vaičiūnienė ◽  
Algirdas Selskis ◽  
Rimantas Vaitkus ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Electrocatalytic Activity ◽  
Au Nanoparticles ◽  
Carbon Support ◽  
Alkaline Media ◽  
Carbon Powder ◽  
Microwave Assisted Synthesis ◽  
One Pot ◽  
Microwave Assisted ◽  
Glucose Electrooxidation

In this study, the gold nanoparticles (AuNPs) without carbon support were prepared using the well-known citrate reduction method. The carbon supported AuNPs nanocomposites were fabricated by two different approaches: chemical adsorption of AuNPs from the prepared citrate stabilized AuNP colloidal solution on the carbon powder surface and one-pot microwave-assisted synthesis. The nanocomposites were characterized using scanning electron microscopy (SEM) and inductively coupled plasma optical emission spectroscopy (ICP-OES). The electrocatalytic activity of the prepared catalysts was evaluated for the electrooxidation of glucose in an alkaline media using cyclic voltammetry. The highest electrocatalytic activity was observed for the catalyst of carbon supported Au nanoparticles prepared by microwave-assisted synthesis, followed by the catalyst of carbon supported Au nanoparticles prepared by means of the adsorption method, whereas the pure Au nanoparticles without carbon support exhibited the lowest electrocatalytic properties for glucose electrooxidation.

The Synthesis and Characterization of PEG-SH-Modified Gold Nanoparticle in One-Pot Synthesis by Stenotrophomonas maltophilia

2019 ◽  
Vol 19 (11) ◽  
pp. 7278-7284
Author(s):  
Jian-Yuan Huang ◽  
Min-Hua Chen ◽  
Feng-Huei Lin
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Stenotrophomonas Maltophilia ◽  
Culture Medium ◽  
Synthesis And Characterization ◽  
One Pot ◽  
Residual Solvent ◽  
Green Route ◽  
The Relationship

Colloidal gold nanoparticles have been researched and utilized in many technical applications. However, the conventionalmethods to produce polyethyleneglycol (PEG) immobilized gold nanoparticles have to take several steps, including residual solvent removing. In the study, we propose an idea green route to synthesize gold nanoparticles by using Stenotrophomonas maltophilia in a one-pot reaction. The relationship between Au precursor and S. maltophilia was evaluated systematically. After PEG-SH addition, the bacterial cell wall was broken down and the synthetic nanoparticles could be released into culture medium. Furthermore, we identified that the crystal structure of synthetic gold nanoparticle was face-center cubic and PEG-SH was immobilized on synthetic gold nanoparticle ideally. The size of Au-PEG-SH was smaller than 30 nm. These findings suggest that gold nanoparticle with PEG-SH modification could be prepared in an eco-friendly one-pot reaction through the metabolic activity of S. maltophilia.

A simple, economical one-pot microwave assisted synthesis of nitrogen and sulfur co-doped graphene for high energy supercapacitors

2020 ◽  
Vol 341 ◽  
pp. 135999 ◽  
Author(s):  
Domga ◽  
Manickavasakam Karnan ◽  
Fatai Oladoyinbo ◽  
Guy Bertrand Noumi ◽  
Jean Bosco Tchatchueng ◽  
...  
Keyword(s):  
High Energy ◽  
Microwave Assisted Synthesis ◽  
One Pot ◽  
Microwave Assisted ◽  
Doped Graphene ◽  
Co Doped

scholarly journals Microwave-Assisted Synthesis of High-Energy Faceted TiO2 Nanocrystals Derived from Exfoliated Porous Metatitanic Acid Nanosheets with Improved Photocatalytic and Photovoltaic Performance

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3614 ◽  
Author(s):  
Yi-en Du ◽  
Xianjun Niu ◽  
Wanxi Li ◽  
Jing An ◽  
Yufang Liu ◽  
...  
Keyword(s):  
Hydrothermal Reaction ◽  
Uv Light ◽  
Photovoltaic Performance ◽  
High Energy ◽  
Anatase Tio2 ◽  
Microwave Assisted Synthesis ◽  
Tio2 Nanocrystals ◽  
One Pot ◽  
Microwave Assisted ◽  
Metatitanic Acid

A facile one-pot microwave-assisted hydrothermal synthesis of rutile TiO2 quadrangular prisms with dominant {110} facets, anatase TiO2 nanorods and square nanoprisms with co-exposed {101}/[111] facets, anatase TiO2 nanorhombuses with co-exposed {101}/{010} facets, and anatase TiO2 nanospindles with dominant {010} facets were reported through the use of exfoliated porous metatitanic acid nanosheets as a precursor. The nanostructures and the formation reaction mechanism of the obtained rutile and anatase TiO2 nanocrystals from the delaminated nanosheets were investigated. The transformation from the exfoliated metatitanic nanosheets with distorted hexagonal cavities to TiO2 nanocrystals involved a dissolution reaction of the nanosheets, nucleation of the primary [TiO6]8− monomers, and the growth of rutile-type and anatase-type TiO2 nuclei during the microwave-assisted hydrothermal reaction. In addition, the photocatalytic activities of the as-prepared anatase nanocrystals were evaluated through the photocatalytic degradation of typical carcinogenic and mutagenic methyl orange (MO) under UV-light irradiation at a normal temperature and pressure. Furthermore, the dye-sensitized solar cell (DSSC) performance of the synthesized anatase TiO2 nanocrystals with various morphologies and crystal facets was also characterized. The {101}/[111]-faceted pH2.5-T175 nanocrystal showed the highest photocatalytic and photovoltaic performance compared to the other TiO2 samples, which could be attributed mainly to its minimum particle size and maximum specific surface area.

pH‐Dependent Metal‐Enhanced Fluorescence from CdTe@PAA Nanospheres near the Au Nanoparticles in Aqueous Solution

2012 ◽  
Vol 30 (7) ◽  
pp. 1490-1496 ◽  
Author(s):  
Rongqing Li ◽  
Chunlei Wang ◽  
Shuhong Xu ◽  
Zhuyuan Wang ◽  
Haibao Shao ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Au Nanoparticles ◽  
Enhanced Fluorescence ◽  
Metal Enhanced Fluorescence ◽  
Ph Dependent

A metal-enhanced fluorescence study of primary amines: determination of aminoglycosides with europium and gold nanoparticles

2015 ◽  
Vol 7 (4) ◽  
pp. 1407-1414 ◽  
Author(s):  
Mehmet Gokhan Caglayan ◽  
Feyyaz Onur
Keyword(s):  
Gold Nanoparticles ◽  
Lipoic Acid ◽  
Primary Amines ◽  
Fluorimetric Detection ◽  
Enhanced Fluorescence ◽  
Fluorescence Study ◽  
Metal Enhanced Fluorescence

This paper describes a lipoic acid capped europium nanoparticle-based assay for the fluorimetric detection of primary amines.

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