Efficiency improvement in non-enzymatic H2O2 detection induced by the simultaneous synthesis of Au and Ag nanoparticles in an RGO/Au/Fe3O4/Ag nanocomposite

2020 ◽  
Vol 44 (21) ◽  
pp. 9037-9045 ◽  
Author(s):  
Kamran Heydaryan ◽  
Mohammad Almasi Kashi ◽  
Nafiseh Sharifi ◽  
Mohammad Ranjbar-Azad
Keyword(s):  
Hydrogen Peroxide ◽  
Ag Nanoparticles ◽  
Efficiency Improvement ◽  
New Class ◽  
H2o2 Detection ◽  
Simultaneous Synthesis

Developing a quick and precise technique for hydrogen peroxide (H2O2) detection would open up a new class of technologies for biological, medical and chemical applications.

scholarly journals Assessment of Morpho-Physiological and Biochemical Responses of Mercury-Stressed Trigonella foenum-gracum L. to Silver Nanoparticles and Sphingobacterium ginsenosidiumtans Applications

Plants ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1349
Author(s):  
Ahlam Khalofah ◽  
Mona Kilany ◽  
Hussein Migdadi
Keyword(s):  
Heavy Metals ◽  
Hydrogen Peroxide ◽  
Photosynthetic Pigments ◽  
Ag Nanoparticles ◽  
Thymus Vulgaris ◽  
Total Phenols ◽  
Biochemical Responses ◽  
Mercury Stress ◽  
Relative Water ◽  
Physiological And Biochemical

Heavy metals are primarily generated and deposited in the environment, causing phytotoxicity. This work evaluated fenugreek plants’ morpho-physiological and biochemical responses under mercury stress conditions toward Ag nanoparticles and Sphingobacterium ginsenosidiumtans applications. The fabrication of Ag nanoparticles by Thymus vulgaris was monitored and described by UV/Vis analysis, FTIR, and SEM. The effect of mercury on vegetative growth was determined by measuring the root and shoots length, the number and area of leaves, the relative water content, and the weight of the green and dried plants; appraisal of photosynthetic pigments, proline, hydrogen peroxide, and total phenols content were also performed. In addition, the manipulation of Ag nanoparticles, S. ginsenosidiumtans, and their combination were tested for mercury stress. Here, Ag nanoparticles were formed at 420 nm with a uniform cuboid form and size of 85 nm. Interestingly, the gradual suppression of vegetal growth and photosynthetic pigments by mercury, Ag nanoparticles, and S. ginsenosidiumtans were detected; however, carotenoids and anthocyanins were significantly increased. In addition, proline, hydrogen peroxide, and total phenols content were significantly increased because mercury and S. ginsenosidiumtans enhance this increase. Ag nanoparticles achieve higher levels by the combination. Thus, S. ginsenosidiumtans and Ag nanoparticles could have the plausible ability to relieve and combat mercury’s dangerous effects in fenugreek.

Etching Volume Effect on the Morphology of Silicon Etched by Metal-Assisted Chemical Method

2012 ◽  
Vol 217-219 ◽  
pp. 1141-1145 ◽  
Author(s):  
Wei Wang ◽  
Li Juan Zhao ◽  
Ping Xin Song ◽  
Ying Jiu Zhang
Keyword(s):  
Hydrogen Peroxide ◽  
Aqueous Solutions ◽  
Formation Mechanism ◽  
Ag Nanoparticles ◽  
Hydrofluoric Acid ◽  
Chemical Method ◽  
Volume Effect ◽  
Etching Solution ◽  
Si Substrates ◽  
Si Nanostructures

Assisted by Ag nanoparticles, Si substrates were etched in aqueous solutions containing hydrofluoric acid (HF) and hydrogen peroxide (H2O2) with different volumes of etching solution. The etching morphology of Si wafers was found to be affected by the volumes. In etching solutions with smaller volume, the pores were created; in etching solutions with larger volume, the nanostructure composed of nanowires and nanopores (pores+wires nanostructure) were generated. In addition, the lengths of these Si nanostructures increased with the increase of the etching volume. Possible formation mechanism for this phenomenon was discussed.

scholarly journals Facile Fabrication of Hierarchical rGO/PANI@PtNi Nanocomposite via Microwave-Assisted Treatment for Non-Enzymatic Detection of Hydrogen Peroxide

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1109 ◽  
Author(s):  
Fa-Gui He ◽  
Jia-Yi Yin ◽  
Gaurav Sharma ◽  
Amit Kumar ◽  
Florian J. Stadler ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
High Performance ◽  
Fast Response ◽  
Microwave Assisted ◽  
H2o2 Detection ◽  
Reduced Graphene ◽  
Large Active Area ◽  
Facile Fabrication ◽  
Novel Strategy ◽  
Enzymatic Detection

A hierarchical composite based on the modified reduced graphene oxide with platinum-nickel decorated polyaniline nano-spheres (rGO/PANI@PtNi) was facilely prepared via microwave-assisted self-reduction for an application in nonenzymatic hydrogen peroxide (H2O2) detection. Compared to the pristine rGO, the composite exhibited a much tougher surface due to the stacking of conductive PANI nano-spheres on rGO sheets, leading to good dispersion of PtNi nanoparticles and a large active area. Furthermore, the multi-valance Ni2+/3+ in the PtNi particles effectively promoted the catalytic property of Pt sites and facilitated a superior electrochemical performance of PtNi alloy than that of neat Pt. Owing to the synergistic effect of the improved electrical conductivity and the promoted electrocatalytical property, the modified glassy carbon electrode (GCE) with rGO/PANI@PtNi nanocomposite displayed an outstanding electrochemical sensitivity towards H2O2 with a fast response time (<2 s), a wide linear range (0.1–126.4 mM), a low detection limit (0.5 µM), as well as a long-life stability for one week without obvious degradation. This novel strategy opens a novel and promising approach to design high performance sensors for H2O2 detection.

Electrophoresis deposition of Ag nanoparticles on TiO2 nanotube arrays electrode for hydrogen peroxide sensing

Talanta ◽  
2013 ◽  
Vol 112 ◽  
pp. 129-135 ◽  
Author(s):  
Yanshu Jiang ◽  
Baozhan Zheng ◽  
Juan Du ◽  
Guangyue Liu ◽  
Yong Guo ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Ag Nanoparticles ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Nanotube Arrays ◽  
Electrophoresis Deposition
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