Synthesis of a hierarchical SiO2/Au/CeO2 rod-like nanostructure for high catalytic activity and recyclability

RSC Advances ◽  
2015 ◽  
Vol 5 (44) ◽  
pp. 34549-34556 ◽  
Author(s):  
Yuanmei Xu ◽  
Yiwei Zhang ◽  
Yuming Zhou ◽  
Zewu Zhang ◽  
Sanming Xiang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
High Catalytic Activity ◽  
Au Nps

Uniform hierarchical SiO2/Au/CeO2 rod-like nanostructures were successfully fabricated by combining three individual synthesis steps, in which sub-5 nm gold nanoparticles (Au NPs) were coated with a mesoporous CeO2 shell.

Facile synthesis of thermo-responsive episulfide group-containing diblock copolymers as robust protecting ligands of gold nanoparticles for catalytic applications

RSC Advances ◽  
2016 ◽  
Vol 6 (44) ◽  
pp. 37487-37499 ◽  
Author(s):  
Dongmei Wang ◽  
Bingxin Liu ◽  
Jianhua Lü ◽  
Changli Lü
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Diblock Copolymers ◽  
Colloidal Stability ◽  
High Catalytic Activity ◽  
Facile Synthesis ◽  
Au Nps ◽  
Catalytic Applications

Well-defined novel thermo-responsive diblock copolymers containing episulfide ligand stabilized Au NPs show interesting assembly morphologies, excellent colloidal stability and high catalytic activity for the reduction of 4-nitrophenol.

A facile construction of Au nanoparticles on a copolymer ligand brushes modified graphene oxide nanoplatform with excellent catalytic properties

RSC Advances ◽  
2016 ◽  
Vol 6 (69) ◽  
pp. 64937-64945 ◽  
Author(s):  
Yajiao Song ◽  
Jianhua Lü ◽  
Bingxin Liu ◽  
Changli Lü
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Au Nanoparticles ◽  
Catalytic Properties ◽  
High Catalytic Activity ◽  
Au Nps ◽  
Modified Graphene Oxide ◽  
Modified Graphene ◽  
Copolymer Brush

Au NPs were generated via in situ reduction on copolymer brush P(OEGMA-co-MQ) functionalized GO. MQ units in the brushes as capping agents could stabilize the Au NPs. The Au NPs–GO hybrid exhibited high catalytic activity for the reduction of 4-NP.

Preparation of TiO2-supported twinned gold nanoparticles by CO treatment and their CO oxidation activity

2015 ◽  
Vol 51 (87) ◽  
pp. 15823-15826 ◽  
Author(s):  
Junya Ohyama ◽  
Taiki Koketsu ◽  
Yuta Yamamoto ◽  
Shigeo Arai ◽  
Atsushi Satsuma
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Co Oxidation ◽  
Au Nanoparticles ◽  
High Catalytic Activity ◽  
Oxidation Activity

Au/TiO2 prepared by CO treatment showed high catalytic activity for CO oxidation due to twinned structure of Au nanoparticles.

scholarly journals Amplified visual immunosensor integrated with nanozyme for ultrasensitive detection of avian influenza virus

2017 ◽  
Author(s):  
Syed Rahin Ahmed ◽  
Suresh Neethirajan
Keyword(s):  
Gold Nanoparticles ◽  
Influenza Virus ◽  
Catalytic Activity ◽  
Avian Influenza ◽  
Avian Influenza Virus ◽  
Limit Of Detection ◽  
Blue Color ◽  
Au Nps ◽  
Influenza Virus A ◽  
Practical Applications

ABSTRACTNanomaterial-based artificial enzymes or nanozymes exhibits superior properties such as stability, cost effectiveness and ease of preparation in comparison to conventional enzymes. However, the lower catalytic activity of nanozymes limits their sensitivity and thereby practical applications in the bioanalytical field. To overcome this drawback, herein we propose a very simple but highly sensitive, specific and low-cost dual enhanced colorimetric immunoassay for the detection of avian influenza virus A (H5N1) through facile in situ synthesis of gold nanoparticles and their peroxidase-like enzymatic activity. 3,3’,5,5’-Tetramethylbenzidine (TMBZ) was used as a reducing agent to produce gold nanoparticles (Au NPs) from a viral target-specific antibody-gold ion complex. The developed blue color from the sensing design was further amplified through catalytic activity of Au NPs in presence of TMBZ–hydrogen peroxide (H2O2) complex. The developed dual enhanced colorimetric immunosensor enables the detection of avian influenza virus A (H5N1) with a limit of detection (LOD) of 1.11 pg/mL. Our results further confirms that the developed assay has superior sensitivity than the conventional ELISA method, plasmonic-based bioassay and commercial flu diagnostic kits.

Green Synthesis of Gold Nanoparticles Using Longan Polysaccharide and their Reduction of 4-nitrophenol and Biological Applications

NANO ◽  
2020 ◽  
Vol 15 (01) ◽  
pp. 2050002 ◽  
Author(s):  
Xiaoyu Zhang ◽  
Liyuan Fan ◽  
Yanshuai Cui ◽  
Tianming Cui ◽  
Shengfu Chen ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Green Synthesis ◽  
Metallic Nanoparticles ◽  
High Catalytic Activity ◽  
Synthetic Method ◽  
Biological Applications ◽  
Au Nps ◽  
Stabilizing Agents ◽  
Highly Dispersed ◽  
Negative Zeta Potential

The green synthesis of gold nanoparticles (Au NPs) for catalytic and biological applications has been drawing great attention. To compare with plant extracts, the polysaccharides may be good reducing and stabilizing agents. In this work, we describe the preparation of longan polysaccharide stabilized gold nanoparticles (Aun-LP NPs) by reduction of gold ions using a green synthetic method. The formation of gold nanoparticles (Au NPs) was confirmed by UV-Vis spectra. TEM showed that Au NPs had a small size (7.8–15.6[Formula: see text]nm) and were highly dispersed without any aggregation. XPS confirmed that the surface elemental composition of Aun-LP NPs was C, O, and Au. DLS demonstrated that Aun-LP NPs had good stability and negative zeta potential. In addition, Aun-LP NPs had high catalytic activity for the reduction of 4-nitrophenol. More importantly, Aun-LP NPs had ignorable cytotoxicity towards HeLa cells and showed good antioxidant activity. Taken together, the results indicated that longan polysaccharide can be used as reducing agents and stabilizers for the preparation of metallic nanoparticles, and the product had wide applications.

In situ loading of gold nanoparticles on Fe3O4@SiO2 magnetic nanocomposites and their high catalytic activity

Nanoscale ◽  
2013 ◽  
Vol 5 (11) ◽  
pp. 4894 ◽  
Author(s):  
Jinmin Zheng ◽  
Yalei Dong ◽  
Weifeng Wang ◽  
Yanhua Ma ◽  
Jing Hu ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Magnetic Nanocomposites ◽  
High Catalytic Activity

Hollow silica nanostructures with small size Au nanoparticles for catalytic applications

RSC Advances ◽  
2016 ◽  
Vol 6 (92) ◽  
pp. 89057-89060 ◽  
Author(s):  
Lin Yao ◽  
Jong-Min Lee
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Au Nanoparticles ◽  
Tetraethyl Orthosilicate ◽  
High Catalytic Activity ◽  
Hollow Silica ◽  
Silica Nanostructures ◽  
Catalytic Applications

Hollow silica nanostructures synthesized using the silica precursors (3-aminopropyl) trimethoxysilane and tetraethyl orthosilicate provide support to small sized gold nanoparticles with a high catalytic activity for the reduction of 4-nitrophenol.

scholarly journals Synthesis, characterization and functional evaluation of gold nanoparticles prepared using Dovyalis abyssinica leaf extracts as reducing and surface capping agent

2021 ◽  
Vol 14 (2) ◽  
pp. 171-190
Author(s):  
Abera Beyene Gebresilassie ◽  
Adam Mekonnen Engida
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Plant Extract ◽  
Radical Scavenging ◽  
Diffraction Spectrum ◽  
Functional Evaluation ◽  
Capping Agent ◽  
Aqueous Fraction ◽  
Au Nps ◽  
Surface Capping

Green synthesis of nanoparticles using plants and microorganisms is biologically safe, cost effective, and environmentally friendly technology. Gold nanoparticles (Au NPs) were synthesized using aqueous extracts of leaves of Dovyalis abyssinica as reducing and surface capping agent and the catalytic activity, antibacterial action and antioxidant potential of the synthesized AU NPs were evaluated. Firstly, HAuCl4 was synthesized in the laboratory from metallic gold and hydrochloric acid using a predesigned method. Secondly, Au NPs was synthesized by mixing HAuCl4 and the plant extract at 45 oC with a digestion time of 1 h. The size of the nanoparticles was modulated by varying the ratio of the plant extract and HAuCl4 with known concentrations. The synthesized Au NPs showed strong absorption around 540 nm which lies in the characteristic absorption region of Au metal nanoparticles (520–580 nm). The X-ray diffraction spectrum of the synthesized Au NPs showed characteristic crystalline structures of gold. The scanning electron spectroscopy images of the synthesized Au NPS revealed the presence of mixed shapes predominantly of irregular shapes and a particle size analyzer displayed an average size of 63.13 nm. The fourier-transform infrared spectrum of Au NPS confirmed the presence of amine, carbonyl and hydroxyl functional groups as surface capping molecules. Although the synthesized Au NPs showed poor bacterial growth inhibition activity on two selected bacteria, it demonstrated excellent free radical scavenging activity against 2, 2-Diphenyl-2-picrylhydrazyl (DPPH) radical and good catalytic activity for degrading bromothymol blue and methyl red compounds. In contrast to the hexane and ethyl acetate extracts, the aqueous fraction was identified as powerful reducing fraction for the synthesis of Au NPs in this experiment. 

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