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Papers by Rumeli Banerjee

Research paper thumbnail of Vanadium‐Incorporated Mesoporous Silica as Oxidase Mimic for Colorimetric Dopamine Detection and Anticancer Activity

Research paper thumbnail of Vanadium Incorporated Dendritic Mesoporous Silica as Oxidase Mimic: Colorimetric Dopamine Detection and Anti-Cancer Activity

Research paper thumbnail of A nano-structured nickel trithiocarbonate complex supported on g-C3N4 as an efficient electrocatalyst for urea electro-oxidation

Materials Advances

Urea electro-oxidation in alkaline medium catalysed by nickel trithiocarbonate complex and g-C3N4... more Urea electro-oxidation in alkaline medium catalysed by nickel trithiocarbonate complex and g-C3N4 composite.

Research paper thumbnail of Improved performance of cobalt hydroxychloride nanoparticles on poly (3-bromo thiophene) template for electrochemical oxygen evolution reaction

Journal of Electroanalytical Chemistry

Research paper thumbnail of Nickel sulphide decorated nitrogen rich ordered mesoporous carbon (NOMC) as an efficient catalyst for the electrocatalytic oxidation of urea in alkaline medium

Electrochimica Acta, 2022

Research paper thumbnail of Improved photocurrent response, photostability and photocatalytic hydrogen generation ability of CdS nanoparticles in presence of mesoporous carbon

Materials Research Bulletin, 2021

Cadmium sulphide nanoparticles suffer an intrinsic disadvantage of photocorrosion as photocatalys... more Cadmium sulphide nanoparticles suffer an intrinsic disadvantage of photocorrosion as photocatalyst. The nanocomposites of mesoporous carbon and CdS nanoparticles improve photostability and minimise photocorrosion of CdS. The recombination of the photogenerated electron and hole which leading to photocorrosion in CdS is thereby prevented by the introduction of mesoporous carbon. The carbon percentage was gradually increased from 10 % to 40 % in the nanocomposites. The introduction of carbon enhances the stability and photocurrent response of the materials. The highly active porous carbon allows the cascading flow of the excitons from CdS restraining the recombination process and also boost up the electron flow which is evident from the increased photosensitivity and photostability. Moreover, the rate of photocatalytic H 2 production from water in the presence of methanol as hole scavenger for nanocomposite was found to be much higher (37,641 μmol g − 1 h − 1) in comparison to pure CdS and carbon.

Research paper thumbnail of A gold nanoparticle-intercalated mesoporous silica-based nanozyme for the selective colorimetric detection of dopamine

Nanoscale Advances, 2020

A AuNP nanoparticle-incorporated mesoporous silica-based nanozyme exhibited the peroxidase-like a... more A AuNP nanoparticle-incorporated mesoporous silica-based nanozyme exhibited the peroxidase-like activity and was utilized for the selective colorimetric detection of dopamine.

Research paper thumbnail of Non‐Aggregation‐Induced Colorimetric Detection of Ag+ by Tetrazine‐Capped Gold Nanoparticles Based on the Formation of Au‐Ag Core‐Shell Nanoparticles

ChemistrySelect, 2019

Recently, simple and rapid colorimetric sensing based on plasmonic nanoparticles has gained much ... more Recently, simple and rapid colorimetric sensing based on plasmonic nanoparticles has gained much attention as no expensive instrument required to achieve high sensitivity. In This study, 3,6‐di(pyridin‐2‐yl)‐1,2,4,5‐s‐tetrazine (pytz) and 3,6‐di(pyridin‐2‐yl)‐1,4‐dihydro‐1,2,4,5‐tetrazine (H2pytz) capped gold nanoparticles (TzAuNPs) were synthesized for the sensitive and selective colorimetric detection of Ag+. The synthesis of TzAuNPs was achieved by reaction of HAuCl4.3H2O in water with ethanolic solution of 3,6‐di(pyridin‐2‐yl)‐1,4‐dihydro‐1,2,4,5‐tetrazine (H2pytz) as reducing agent without the addition of any external stabilizing agent. As prepared TzAuNPs were characterized by FT‐IR, UV‐Vis, XRD and HRTEM techniques. The Ag+ sensing mechanism is based on the formation of Au−Ag core‐shell nanoparticles (NPs). The formation of Au−Ag core‐shell NPs has been achieved in absence of any external reducing agents to observe a distinct color change from red to brown. H2pytz molecules p...

Research paper thumbnail of Mesoporous silica supported ytterbium as catalyst for synthesis of 1,2-disubstituted benzimidazoles and 2-substituted benzimidazoles

Applied Organometallic Chemistry, 2018

The benzimidazole ring is an important pharmacophore in contemporary drug discovery. Thus, effort... more The benzimidazole ring is an important pharmacophore in contemporary drug discovery. Thus, effort to identifying new compounds containing benzimidazole scaffolds have gained much attention in recent years. In the present study, MCM-41 type mesoporous silica with large pore (l-MSN) supported ytterbium was successfully prepared by wet impregnation method. Among rare earth metal salts, ytterbium triflate has already been widely investigated as a catalyst in organic synthesis but less toxic ytterbium oxide has yet to be explored. Relatively high abundance and low cost of ytterbium with respect to many catalytically active metals (e.g. Pd, Au, Ru, Ir, Pt) offer an opportunity to develop sustainable catalysts for organic conversions. The catalyst has been characterized by various techniques including nitrogen adsorption, FT-IR, TEM, SEM, EDX technique and elemental mapping. The obtained materials exhibit high surface area and a narrow distribution of mesoporosity. The catalytic performance of the Yb@l-MSNs was tested by synthesis of 1,2-disubstituted benzimidazoles and 2-substituted benzimidazoles through the coupling of aldehydes with o-phenylenediamine. The catalyst resulted in excellent yields in short reaction times and the reaction showed tolerance toward both electron-donating and electron-withdrawing functional groups at room temperature. A particularly interesting finding was the solvent selectivity of this reaction; namely, 1,2-disubstituted benzimidazoles generated as major product in water-ethanol, while the 2-substituted benzimidazoles was generated exclusively in non-polar solvents like toluene.

Research paper thumbnail of One Step Synthesis of a Gold/Ordered Mesoporous Carbon Composite Using a Hard Template Method for Electrocatalytic Oxidation of Methanol and Colorimetric Determination of Glutathione

ACS Omega, 2019

Ordered mesoporous carbon-supported gold nanoparticles (Au/OMC) have been fabricated in one step ... more Ordered mesoporous carbon-supported gold nanoparticles (Au/OMC) have been fabricated in one step through a hard template method using gold nanoparticleintercalated mesoporous silica (GMS) to explore two different catalytic properties, for example, electrocatalytic oxidation of methanol and colorimetric determination of glutathione (GSH). The catalytically inert but conducting nature of mesoporous carbon (OMC) and promising catalytic activity of gold nanoparticles (AuNPs) has inspired us to synthesize Au/OMC. The as-prepared Au/OMC catalyst was characterized by powder X-ray diffraction, N 2 adsorption− desorption, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray analysis-elemental mapping, and X-ray photoelectron spectroscopy. The characterization results indicate that AuNPs are uniformly distributed on the surface of OMC. The conducting-OMC framework with a high surface area of Au/OMC provides superior transport of electrons through the porous surface of carbon matrix and resulted in its high efficiency and stability as an electrocatalyst for the oxidation of methanol in comparison to CMK-3, SBA-15, and GMS in alkaline medium. The efficiency of Au/OMC toward methanol oxidation in alkaline medium is much higher in comparison to that in acidic medium. The lower value of I f /I b in the acidic medium in comparison to that in the alkaline medium clearly indicates that the oxidation process with Au/OMC as a catalyst is much more superior in alkaline medium with better tolerance toward the accumulation of intermediate CO species on the active surface area. Furthermore, the Au/OMC catalyst is successfully utilized for the detection and quantification of GSH spectrophotometrically with a limit of detection value of 0.604 nM.

Research paper thumbnail of Vanadium‐Incorporated Mesoporous Silica as Oxidase Mimic for Colorimetric Dopamine Detection and Anticancer Activity

Research paper thumbnail of Vanadium Incorporated Dendritic Mesoporous Silica as Oxidase Mimic: Colorimetric Dopamine Detection and Anti-Cancer Activity

Research paper thumbnail of A nano-structured nickel trithiocarbonate complex supported on g-C3N4 as an efficient electrocatalyst for urea electro-oxidation

Materials Advances

Urea electro-oxidation in alkaline medium catalysed by nickel trithiocarbonate complex and g-C3N4... more Urea electro-oxidation in alkaline medium catalysed by nickel trithiocarbonate complex and g-C3N4 composite.

Research paper thumbnail of Improved performance of cobalt hydroxychloride nanoparticles on poly (3-bromo thiophene) template for electrochemical oxygen evolution reaction

Journal of Electroanalytical Chemistry

Research paper thumbnail of Nickel sulphide decorated nitrogen rich ordered mesoporous carbon (NOMC) as an efficient catalyst for the electrocatalytic oxidation of urea in alkaline medium

Electrochimica Acta, 2022

Research paper thumbnail of Improved photocurrent response, photostability and photocatalytic hydrogen generation ability of CdS nanoparticles in presence of mesoporous carbon

Materials Research Bulletin, 2021

Cadmium sulphide nanoparticles suffer an intrinsic disadvantage of photocorrosion as photocatalys... more Cadmium sulphide nanoparticles suffer an intrinsic disadvantage of photocorrosion as photocatalyst. The nanocomposites of mesoporous carbon and CdS nanoparticles improve photostability and minimise photocorrosion of CdS. The recombination of the photogenerated electron and hole which leading to photocorrosion in CdS is thereby prevented by the introduction of mesoporous carbon. The carbon percentage was gradually increased from 10 % to 40 % in the nanocomposites. The introduction of carbon enhances the stability and photocurrent response of the materials. The highly active porous carbon allows the cascading flow of the excitons from CdS restraining the recombination process and also boost up the electron flow which is evident from the increased photosensitivity and photostability. Moreover, the rate of photocatalytic H 2 production from water in the presence of methanol as hole scavenger for nanocomposite was found to be much higher (37,641 μmol g − 1 h − 1) in comparison to pure CdS and carbon.

Research paper thumbnail of A gold nanoparticle-intercalated mesoporous silica-based nanozyme for the selective colorimetric detection of dopamine

Nanoscale Advances, 2020

A AuNP nanoparticle-incorporated mesoporous silica-based nanozyme exhibited the peroxidase-like a... more A AuNP nanoparticle-incorporated mesoporous silica-based nanozyme exhibited the peroxidase-like activity and was utilized for the selective colorimetric detection of dopamine.

Research paper thumbnail of Non‐Aggregation‐Induced Colorimetric Detection of Ag+ by Tetrazine‐Capped Gold Nanoparticles Based on the Formation of Au‐Ag Core‐Shell Nanoparticles

ChemistrySelect, 2019

Recently, simple and rapid colorimetric sensing based on plasmonic nanoparticles has gained much ... more Recently, simple and rapid colorimetric sensing based on plasmonic nanoparticles has gained much attention as no expensive instrument required to achieve high sensitivity. In This study, 3,6‐di(pyridin‐2‐yl)‐1,2,4,5‐s‐tetrazine (pytz) and 3,6‐di(pyridin‐2‐yl)‐1,4‐dihydro‐1,2,4,5‐tetrazine (H2pytz) capped gold nanoparticles (TzAuNPs) were synthesized for the sensitive and selective colorimetric detection of Ag+. The synthesis of TzAuNPs was achieved by reaction of HAuCl4.3H2O in water with ethanolic solution of 3,6‐di(pyridin‐2‐yl)‐1,4‐dihydro‐1,2,4,5‐tetrazine (H2pytz) as reducing agent without the addition of any external stabilizing agent. As prepared TzAuNPs were characterized by FT‐IR, UV‐Vis, XRD and HRTEM techniques. The Ag+ sensing mechanism is based on the formation of Au−Ag core‐shell nanoparticles (NPs). The formation of Au−Ag core‐shell NPs has been achieved in absence of any external reducing agents to observe a distinct color change from red to brown. H2pytz molecules p...

Research paper thumbnail of Mesoporous silica supported ytterbium as catalyst for synthesis of 1,2-disubstituted benzimidazoles and 2-substituted benzimidazoles

Applied Organometallic Chemistry, 2018

The benzimidazole ring is an important pharmacophore in contemporary drug discovery. Thus, effort... more The benzimidazole ring is an important pharmacophore in contemporary drug discovery. Thus, effort to identifying new compounds containing benzimidazole scaffolds have gained much attention in recent years. In the present study, MCM-41 type mesoporous silica with large pore (l-MSN) supported ytterbium was successfully prepared by wet impregnation method. Among rare earth metal salts, ytterbium triflate has already been widely investigated as a catalyst in organic synthesis but less toxic ytterbium oxide has yet to be explored. Relatively high abundance and low cost of ytterbium with respect to many catalytically active metals (e.g. Pd, Au, Ru, Ir, Pt) offer an opportunity to develop sustainable catalysts for organic conversions. The catalyst has been characterized by various techniques including nitrogen adsorption, FT-IR, TEM, SEM, EDX technique and elemental mapping. The obtained materials exhibit high surface area and a narrow distribution of mesoporosity. The catalytic performance of the Yb@l-MSNs was tested by synthesis of 1,2-disubstituted benzimidazoles and 2-substituted benzimidazoles through the coupling of aldehydes with o-phenylenediamine. The catalyst resulted in excellent yields in short reaction times and the reaction showed tolerance toward both electron-donating and electron-withdrawing functional groups at room temperature. A particularly interesting finding was the solvent selectivity of this reaction; namely, 1,2-disubstituted benzimidazoles generated as major product in water-ethanol, while the 2-substituted benzimidazoles was generated exclusively in non-polar solvents like toluene.

Research paper thumbnail of One Step Synthesis of a Gold/Ordered Mesoporous Carbon Composite Using a Hard Template Method for Electrocatalytic Oxidation of Methanol and Colorimetric Determination of Glutathione

ACS Omega, 2019

Ordered mesoporous carbon-supported gold nanoparticles (Au/OMC) have been fabricated in one step ... more Ordered mesoporous carbon-supported gold nanoparticles (Au/OMC) have been fabricated in one step through a hard template method using gold nanoparticleintercalated mesoporous silica (GMS) to explore two different catalytic properties, for example, electrocatalytic oxidation of methanol and colorimetric determination of glutathione (GSH). The catalytically inert but conducting nature of mesoporous carbon (OMC) and promising catalytic activity of gold nanoparticles (AuNPs) has inspired us to synthesize Au/OMC. The as-prepared Au/OMC catalyst was characterized by powder X-ray diffraction, N 2 adsorption− desorption, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray analysis-elemental mapping, and X-ray photoelectron spectroscopy. The characterization results indicate that AuNPs are uniformly distributed on the surface of OMC. The conducting-OMC framework with a high surface area of Au/OMC provides superior transport of electrons through the porous surface of carbon matrix and resulted in its high efficiency and stability as an electrocatalyst for the oxidation of methanol in comparison to CMK-3, SBA-15, and GMS in alkaline medium. The efficiency of Au/OMC toward methanol oxidation in alkaline medium is much higher in comparison to that in acidic medium. The lower value of I f /I b in the acidic medium in comparison to that in the alkaline medium clearly indicates that the oxidation process with Au/OMC as a catalyst is much more superior in alkaline medium with better tolerance toward the accumulation of intermediate CO species on the active surface area. Furthermore, the Au/OMC catalyst is successfully utilized for the detection and quantification of GSH spectrophotometrically with a limit of detection value of 0.604 nM.