Enhanced catalytic and SERS activities of CTAB stabilized interconnected osmium nanoclusters

Abstract

A new route for the formation of osmium nanoparticles (NPs) having different morphologies like aggregated clusters, chain-like networks, and small spheres are reported. The synthesis was done by utilizing a simple wet-chemical method at room temperature (RT) by the reaction of OsO 4 , cetyl trimethyl ammonium bromide (CTAB), 2,7-dihydroxynaphthalene (2,7-DHN) and NaOH under 30 min of reaction. The diameter of the individual particles in all the morphologies was B1-3 nm. The synthesized materials have been tested for catalysis and SERS studies. The catalysis study was examined taking different organic nitro compounds and the catalysis rate was found superior as compared to other reports. The surface enhanced Raman scattering (SERS) study was done taking Rose Bengal (R Be) as a probe molecule and the observed enhancement factor (EF) value was found superior or comparable to most of other noble metal NPs. The overall synthesis process was simple, less time consuming and cost-effective. The enhanced catalytic and SERS activities of the Os NCs might open up a new avenue for the application in other organic catalysis reactions, SERS based detection of environmentally important trace bio-molecules and sensors.

Catalytic Reduction of Toxic Nitroarenes in Aqueous Medium Using Worm‐Like Rhodium Nanoparticles

“…The nanoparticles aggregate to form long nanochains which show defective sites in the form of grooves or furrows which can act as active centers for catalysis . The morphological effect of osmium nanoclusters on the catalytic conversion of organic nitro aromatic compounds and the SERS studies was reported by S. Kundu and co‐workers . S. Sampath et al .…”

“…[10] The morphological effect of osmium nanoclusters on the catalytic conversion of organic nitro aromatic compounds and the SERS studies was reported by S. Kundu and co-workers. [11] S. Sampath et al demonstrated the importance of Iridium nanostructures on the SERS studies. [12] The literature on Rh nanoparticles synthesis and their catalytic behaviour are limited compared to Au and Ag nanoparticles.…”

Synthesis of palladium nanoparticles using continuous flow microreactor

“…The peak observed at 3650 cm -1 represents the presence of pure CTAB and O-H stretching of the surfactant. The peak was also observed at 3337 cm-1 corresponding to N-H stretching vibration of CTAB capped onto the Pd nanoparticles[50]. Themethylene C-H stretching and anti-stretching vibration frequencies of pure CTAB are observed at 2880 and 2939cm −1 [50-51], while only a single peak shift was observed at 2875cm −1 in case of Pd nanoparticles, which indicates the presence of -CH 2 vibration of capping agent (surfactant) on the surface of Pd nanoparticle.…”

Electrochemistry and surface-enhanced Raman spectroscopy of CTAB modulated interactions of magnetic nanoparticles with biomolecules

“…With the advent of SERS, the limitation in Raman spectroscopic technique to recognize weak signals from noise signals were also solved. Some of the recent works [25][26][27][28] reported in the analysis of biomolecules using SERS highlights the importance of such studies with respect to advances in research. Molecular association of the iron oxide nanoparticles with protein and polysaccharide in presence of CTAB was probed using this technique.…”