scholarly journals Charge Polarization at Catalytic Metal–Support Junctions, Part A: Kelvin Probe Force Microscopy Results of Noble Metal Nanoparticles

2016 ◽  
Vol 120 (16) ◽  
pp. 8907-8916 ◽  
Author(s):  
Tobias Kittel ◽  
Emil Roduner
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Kelvin Probe Force Microscopy ◽  
Noble Metal Nanoparticles ◽  
Kelvin Probe ◽  
Force Microscopy ◽  
Charge Polarization ◽  
Metal Support ◽  
Catalytic Metal

scholarly journals Synthesis, Characterization, and Antimicrobial Properties of Sparfloxacin-Mediated Noble Metal Nanoparticles

2020 ◽  
Vol 14 (3) ◽  
pp. 1789-1800 ◽  
Author(s):  
Muhammad Nisar ◽  
Shujaat Ali Khan ◽  
Maryam Gul ◽  
Abdur Rauf ◽  
Salman Zafar ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Antimicrobial Properties ◽  
Sem Analysis ◽  
Noble Metal Nanoparticles ◽  
Solution Temperature ◽  
Klebsiella Pneumonia ◽  
Force Microscopy ◽  
Atomic Force ◽  
Stable Mono

The aim of the current research finding was to synthesize, characterize and antibacterial evaluation of sparfloxacin-mediated noble metal nanoparticles. Noble metal [silver (Ag), and gold (Au)] nanoparticles (NPs), mediated with fluoroquinolone, an anti-bacterial drug [Sparfloxacin, (Sp)], was synthesized by a facile and convenient procedure. Formulated Ag-Sp NPs, and Au-Sp NPs exhibited stability against variation in pH, NaCl solution, temperature, and time. The structural topographies of Ag-Sp, and Au-Sp NPs were determined by fourier transform infrared spectroscopy (FTIR), UV-visible spectroscopy (UV-Vis), scanning electron microscopy (SEM) atomic force microscopy (AFM), and energy dispersive X-ray (EDX). UV-Vis revealed the formulation of NPs by showing typical surface Plasmon absorption maxima at 410 nm for Ag-Sp NPs and 555 nm for Au-Sp NPs. The AFM and SEM analysis ascertained stable mono dispersed Ag-Sp NPs and Au-Sp NPs in the size range of 40-50 nm, and 70-80 nm, respectively. Ag-Sp, and Au-Sp NPs exhibited antibacterial traits against Bacillus subtilis, Staphylococcus aureus, and Klebsiella pneumonia, showing a zone of inhibition (ZOI) ranging from 20±0.98 mm to 24±0.94 mm (Ag-Sp NPs), and 22±0.79 mm to 26±0.92 mm (Au-Sp NPs) at dose of 3 mg/mL.

Strategy for stabilizing noble metal nanoparticles without sacrificing active sites

2019 ◽  
Vol 55 (48) ◽  
pp. 6846-6849 ◽  
Author(s):  
Weikang Ji ◽  
Xuyu Wang ◽  
Minni Tang ◽  
Le Yang ◽  
Zebao Rui ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Active Sites ◽  
Noble Metal Nanoparticles ◽  
Electronic Interaction ◽  
Pt Nanoparticle ◽  
Support Interaction ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Surface Fluorination

We report a facile surface fluorination strategy for restricting Pt nanoparticle sintering through providing anchoring sites on the TiO2 support and enhancing metal–support interaction via improved electronic interaction without sacrificing the active sites.

Noble metal enhanced photocatalytic activity of heterostructured TiO2 spheres with tunable interiors and shells

2020 ◽  
Vol 13 (08) ◽  
pp. 2050039
Author(s):  
Bo Qiu ◽  
Xin Xiao ◽  
Min Zhang ◽  
Yue Mao ◽  
Xiaoheng Liu
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Precious Metal ◽  
Active Sites ◽  
Inner Core ◽  
Catalytic Performance ◽  
Noble Metal Nanoparticles ◽  
Oxide Support ◽  
Metal Support Interaction ◽  
Metal Support

Heterostructured TiO2 spheres with tunable interiors and shells were prepared by self-template technology. This structure is composed of a hollow shell and an inner core which can enhance light scattering in the hollow space and provide a large surface to generate sufficient active sites. Besides, the nanosheets grown on the shell layer not only increased their specific surface area, but also exposed more surface-active sites. The performance of photocatalysts was estimated by the RhB decolorization, and experimental results show that the photoactivity can be greatly improved by depositing noble metal nanoparticles. It improves the efficiency of charge utilization and enhances the overall catalytic performance from the three stages of charge carrier generation, separation and surface reaction. The strong metal–support interaction (SMSI) between the noble metal nanoparticles and the oxide support has been proven to inhibit the supported precious metal, one strategy for nanoparticle aggregation and growth. On the one hand, the nanoshells isolate the precious metal nanoparticles from each other, preventing the aggregation of metal nanoparticles.

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