scholarly journals In situ formation of mononuclear complexes by reaction-induced atomic dispersion of supported noble metal nanoparticles

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Siquan Feng ◽  
Xiangen Song ◽  
Yang Liu ◽  
Xiangsong Lin ◽  
Li Yan ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
High Surface ◽  
Volume Ratio ◽  
Noble Metal Nanoparticles ◽  
General Strategy ◽  
Metal Nanoclusters ◽  
Metal Site ◽  
Mononuclear Complexes

AbstractSupported noble metal nanoclusters and single-metal-site catalysts are inclined to aggregate into particles, driven by the high surface-to-volume ratio. Herein, we report a general method to atomically disperse noble metal nanoparticles. The activated carbon supported nanoparticles of Ru, Rh, Pd, Ag, Ir and Pt metals with loading up to 5 wt. % are completely dispersed by reacting with CH3I and CO mixture. The dispersive process of the Rh nanoparticle is investigated in depth as an example. The in-situ detected I• radicals and CO molecules are identified to promote the breakage of Rh-Rh bonds and the formation of mononuclear complexes. The isolated Rh mononuclear complexes are immobilized by the oxygen-containing functional groups based on the effective atomic number rule. The method also provides a general strategy for the development of single-metal-site catalysts for other applications.

scholarly journals TLC-SERS Plates with a Built-In SERS Layer Consisting of Cap-Shaped Noble Metal Nanoparticles Intended for Environmental Monitoring and Food Safety Assurance

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
H. Takei ◽  
J. Saito ◽  
K. Kato ◽  
H. Vieker ◽  
A. Beyer ◽  
...  
Keyword(s):  
Environmental Monitoring ◽  
Metal Nanoparticles ◽  
Noble Metal ◽  
Food Additives ◽  
Skim Milk ◽  
Chemical Species ◽  
Noble Metal Nanoparticles ◽  
Surface Enhanced Raman ◽  
Mixture Samples

We report on a thin layer chromatograph (TLC) with a built-in surface enhanced Raman scattering (SERS) layer for in-situ identification of chemical species separated by TLC. Our goal is to monitor mixture samples or diluted target molecules suspended in a host material, as happens often in environmental monitoring or detection of food additives. We demonstrate that the TLC-SERS can separate mixture samples and provide in-situ SERS spectra. One sample investigated was a mixture consisting of equal portions of Raman-active chemical species, rhodamine 6 G (R6G), crystal violet (CV), and 1,2-di(4-pyridyl)ethylene (BPE). The three components could be separated and their SERS spectra were obtained from different locations. Another sample was skim milk with a trace amount of melamine. Without development, no characteristic peaks were observed, but after development, a peak was observed at 694 cm−1. Unlike previous TLC-SERS whereby noble metal nanoparticles are added after development of a sample, having a built-in SERS layer greatly facilitates analysis as well as maintaining high uniformity of noble metal nanoparticles.

Sol-Flame Synthesis: A General Strategy To Decorate Nanowires with Metal Oxide/Noble Metal Nanoparticles

Nano Letters ◽  
2012 ◽  
Vol 13 (3) ◽  
pp. 855-860 ◽  
Author(s):  
Yunzhe Feng ◽  
In Sun Cho ◽  
Pratap M. Rao ◽  
Lili Cai ◽  
Xiaolin Zheng
Keyword(s):  
Metal Oxide ◽  
Metal Nanoparticles ◽  
Noble Metal ◽  
Noble Metal Nanoparticles ◽  
Flame Synthesis ◽  
General Strategy

A Recycling-Free Nanocatalyst System: The Stabilization of In Situ-Reduced Noble Metal Nanoparticles on Silicone Nanofilaments via a Mussel-Inspired Approach

ACS Catalysis ◽  
2017 ◽  
Vol 7 (4) ◽  
pp. 2412-2418 ◽  
Author(s):  
Xiang Fei ◽  
Wangqing Kong ◽  
Xin Chen ◽  
Xuejiao Jiang ◽  
Zhengzhong Shao ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Noble Metal Nanoparticles

2D hydrogenated boride as a reductant and stabilizer for in situ synthesis of ultrafine and surfactant-free carbon supported noble metal electrocatalysts with enhanced activity and stability

2020 ◽  
Vol 8 (36) ◽  
pp. 18856-18862
Author(s):  
Saisai Gao ◽  
Yang Zhang ◽  
Jinglei Bi ◽  
Bin Wang ◽  
Chao Li ◽  
...  
Keyword(s):  
Carbon Black ◽  
Metal Nanoparticles ◽  
Noble Metal ◽  
In Situ Synthesis ◽  
Free Carbon ◽  
Noble Metal Nanoparticles ◽  
Enhanced Activity

Ultrafine, surfactant-free and high dispersed noble metal nanoparticles synthesized on carbon black with hydrogenated boride as reductant and stabilizer, which presented enhanced activity and durability relative to the commercial counterparts.

Sign in / Sign up

Export Citation Format

Share Document