Enhanced catalytic and supercapacitor activities of DNA encapsulated β-MnO<sub>2</sub>nanomaterials

Ede, Sivasankara Rao; Ramadoss, Ananthakumar; Anantharaj, Sengeni; Nithiyanantham, U.; Kundu, Subrata

doi:10.1039/c4cp02884h

Cited by 68 publications

(54 citation statements)

References 59 publications

(71 reference statements)

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“…61 The structural properties of the synthesized catalyst was analysed by XRD and compared with the pure MWCNTs. Very similar FT-IR spectra to previously reports have been observed.…”

Section: Scheme 1 Synthesis Of the Catalyst Pd/dna@mwcntsmentioning

confidence: 99%

Regioselective Heck reaction catalyzed by Pd nanoparticles immobilized on DNA-modified MWCNTs

2016

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This is the first report of regioselective Heck reaction of aryl iodides with 2,3-dihydrofuran using heterogonous nanocatalyst. Herein, palladium nanoparticles is immobilized on DNA-modified multi walled carbon nanotubes and characterized by FT-IR spectroscopy, UV-vis spectroscopy, field emission scanning electron microscopy, X-ray diffraction, transmission electron microscopy, inductively coupled plasma and elemental analysis. DNA as a welldefined structure and biodegradable natural polymer generate the palladium catalyst which showed high activity in common and regioselective Heck reaction in excellent yields and good selectivity under ligand-free and mild reaction conditions. Moreover, the catalyst could be recovered and reused at least nine times without any considerable loss of its catalytic activity.

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“…61 The structural properties of the synthesized catalyst was analysed by XRD and compared with the pure MWCNTs. Very similar FT-IR spectra to previously reports have been observed.…”

Section: Scheme 1 Synthesis Of the Catalyst Pd/dna@mwcntsmentioning

confidence: 99%

Regioselective Heck reaction catalyzed by Pd nanoparticles immobilized on DNA-modified MWCNTs

2016

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“…The appearance of LMCT band for other metal salts are also observed earlier. [40][41][42][43] A mixture of aqueous DNA, sodium tungstate and SnCl 2 shows a small hump from 237 nm to 331 nm range with a peak maximum at 258 nm (curve d, Figure 2A). The shifting of original DNA peak (curve a, Figure 2A Figure 2B.…”

Section: Microscope (Fe-sem) Analysismentioning

confidence: 99%

Microwave Synthesis of SnWO₄ Nanoassemblies on DNA Scaffold: A Novel Material for High Performance Supercapacitor and as Catalyst for Butanol Oxidation

Ede

Kundu

2015

ACS Sustainable Chem. Eng.

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Self-assembled, aggregated SnWO 4 nano-assemblies are formed by the reaction ofSn(II) salt and Na 2 WO 4 .2H 2 O in the presence of DNA under microwave heating within six minutes. We have emphasized the natural properties of DNA with its ability to scaffold SnWO 4 nano-assemblies and examined the role of starting reagents on the particles morphology. The diameter of the individual particles is ultra-small and varies from ~ 1-2.5 nm. The potentiality of the SnWO 4 nano-assemblies has been tested for the first time in two different applications, such as an anode material in electrochemical supercapacitor studies and as a catalyst for the oxidation of butanol to butanoic acid. From supercapacitor study, it was observed that SnWO 4 nano-assemblies with different sizes showed different specific capacitance (C s ) values and the highest C s value was observed for SnWO 4 nano-assemblies having small size of the individual particles. The highest C s value of 242 F g -1 was observed at a scan rate of 5 mV s -1 for small size SnWO 4 nano-assemblies. The capacitor shows an excellent long cycle life along with 85% retention of C s value even after 4000 consecutive times of cycling at a current density of 10 mAcm -2 . From the catalysis studies, it was observed that SnWO 4 nano-assemblies acted as a potential catalyst for the oxidation of butanol to butanoic acid using eco-friendly hydrogen peroxide as an oxidant with 100 % product selectivity. Other than catalysis and supercapacitor, in futuristic, the material can further be used in sensor, visible light photo-catalysis and energy related applications.Research on nanomaterials, mainly nanoparticles (NPs) has been focused on the assembly strategies to control the specific arrangement of NPs. The morphology controlled synthesis of zero and 1-dimensional (1-D) inorganic nanomaterials have attracted significant interest due to the importance of the geometrical forms of materials in determining their widely varying properties at nanoscale. 1-3 During last few years, a bunch of techniques had been developed for the successful generation of self-assembled NPs into ordered nanostructures. However, there are very few techniques available to organize nanomaterials in a precise 1-D pattern. The 'bottom up' approach and the wet-chemical synthesis have been found to be the most easy and facile way to synthesize self-assemble nanomaterials in 1-D patterns in a short time scale. While considering metal oxide nanomaterials in general, they have been extensively studied owing to their unique magnetic, catalytic and Energy storage properties across a broad range of fundamental and technological potential. In particular, the fields like Energy storage and in catalysis. Electrochemical Supercapacitors show the desirable characteristics of high power density, fast charging, excellent cyclic stability, small size and low mass, when compared with batteries and fuel cells, make them one of the most promising candidates for next generation power devices. 4-7 In general, most commercially available ...

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“…Especially, the synthesis of water-soluble conducting polymers has gained more interest due to their potential applications in soluble ion exchangers, energy storage materials, and corrosion-resistant coatings and as catalysts. 39 In our present study, we investigated the catalytic application of the DNA-capped b-MnO 2 organosol dispersed in ethanol for the polymerization reaction of pyrrole at RT. 34 Chougule et al prepared polypyrrole using ammonium persulphate as an oxidizing agent within 3 h. 35 All these process utilized toxic reagents and consumed much time to obtain the desired product.…”

Section: View Article Onlinementioning

confidence: 99%

DNA-encapsulated chain and wire-like β-MnO₂organosol for oxidative polymerization of pyrrole to polypyrrole

Ede

Anantharaj

Nithiyanantham

et al. 2015

Phys. Chem. Chem. Phys.

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A DNA-encapsulated chain and wire-like β-MnO2 organosols have been synthesized utilizing a two-phase water-toluene extraction procedure at room temperature (RT). The β-MnO2 organosol was prepared by transferring KMnO4 and DNA from aqueous solution separately to an organic solvent (toluene) using a phase transfer catalyst, mixing both organic solutions together, and subsequent reduction with NaBH4. The eventual diameters of the MnO2 particles in chain-like and wire-like morphologies were ∼1-2 nm and ∼1.8 ± 0.2 nm, respectively, whereas the nominal length of the DNA-MnO2 chains was ∼2-3 μm. Different morphologies of the MnO2 organosol were synthesized by simply tuning the DNA to KMnO4 molar ratio. The synthesized particles were successfully re-dispersed in different organic solvents for application in various organic reactions. The potential of the DNA-MnO2 organosol as a catalyst has been tested in the organic catalytic reaction for the oxidative polymerization of pyrrole to polypyrrole, using the DNA-MnO2 organosol as a potential catalyst. The synthesis process was simple, reproducible and robust. In future, the present process might be utilized for the formation of other nanomaterials in organic solvents, with specific morphologies and uses in a variety of catalytic reactions and energy storage applications.

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Enhanced catalytic and supercapacitor activities of DNA encapsulated β-MnO₂nanomaterials

Cited by 68 publications

References 59 publications

Regioselective Heck reaction catalyzed by Pd nanoparticles immobilized on DNA-modified MWCNTs

Regioselective Heck reaction catalyzed by Pd nanoparticles immobilized on DNA-modified MWCNTs

Microwave Synthesis of SnWO₄ Nanoassemblies on DNA Scaffold: A Novel Material for High Performance Supercapacitor and as Catalyst for Butanol Oxidation

DNA-encapsulated chain and wire-like β-MnO₂organosol for oxidative polymerization of pyrrole to polypyrrole

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Enhanced catalytic and supercapacitor activities of DNA encapsulated β-MnO2nanomaterials

Cited by 68 publications

References 59 publications

Regioselective Heck reaction catalyzed by Pd nanoparticles immobilized on DNA-modified MWCNTs

Regioselective Heck reaction catalyzed by Pd nanoparticles immobilized on DNA-modified MWCNTs

Microwave Synthesis of SnWO4 Nanoassemblies on DNA Scaffold: A Novel Material for High Performance Supercapacitor and as Catalyst for Butanol Oxidation

DNA-encapsulated chain and wire-like β-MnO2organosol for oxidative polymerization of pyrrole to polypyrrole

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Enhanced catalytic and supercapacitor activities of DNA encapsulated β-MnO₂nanomaterials

Microwave Synthesis of SnWO₄ Nanoassemblies on DNA Scaffold: A Novel Material for High Performance Supercapacitor and as Catalyst for Butanol Oxidation

DNA-encapsulated chain and wire-like β-MnO₂organosol for oxidative polymerization of pyrrole to polypyrrole