Paromita Kundu | IMEC - Academia.edu (original) (raw)

Paromita Kundu

Phone: +32465201124
Address: IMEC, Kapeldreef 75
3001 Heverlee
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Papers by Paromita Kundu

Research paper thumbnail of 3D Au-SiO2 Nanohybrids as a Potential Scaffold Coating Material for Neuroengineering

RSC Adv., 2016

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Research paper thumbnail of Nanoscale Heterostructures Based on ZnO with Enhanced Visible Light Harvesting Efficiency

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Research paper thumbnail of Nanoscale Interconnects by Nucleation: Site-Specific Attachment of Molecular Scale Au Nanowire

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Research paper thumbnail of Functional Nanohybrids with Engineered Interfaces

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Research paper thumbnail of Pristine nanomaterials: synthesis, stability and applications

Nanoscale, 2013

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Research paper thumbnail of New Insights into Selective Heterogeneous Nucleation of Metal Nanoparticles on Oxides by Microwave-Assisted Reduction: Rapid Synthesis of High-Activity Supported Catalysts

ACS Nano, 2011

Microwave-based methods are widely employed to synthesize metal nanoparticles on various substrat... more Microwave-based methods are widely employed to synthesize metal nanoparticles on various substrates. However, the detailed mechanism of formation of such hybrids has not been addressed. In this paper, we describe the thermodynamic and kinetic aspects of reduction of metal salts by ethylene glycol under microwave heating conditions. On the basis of this analysis, we identify the temperatures above which the reduction of the metal salt is thermodynamically favorable and temperatures above which the rates of homogeneous nucleation of the metal and the heterogeneous nucleation of the metal on supports are favored. We delineate different conditions which favor the heterogeneous nucleation of the metal on the supports over homogeneous nucleation in the solvent medium based on the dielectric loss parameters of the solvent and the support and the metal/solvent and metal/support interfacial energies. Contrary to current understanding, we show that metal particles can be selectively formed on the substrate even under situations where the temperature of the substrate is lower than that of the surrounding medium. The catalytic activity of the Pt/CeO(2) and Pt/TiO(2) hybrids synthesized by this method for H(2) combustion reaction shows that complete conversion is achieved at temperatures as low as 100 °C with Pt-CeO(2) catalyst and at 50 °C with Pt-TiO(2) catalyst. Our method thus opens up possibilities for rational synthesis of high-activity supported catalysts using a fast microwave-based reduction method.

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Research paper thumbnail of Au 2 S x /CdS Nanorods by Cation Exchange: Mechanistic Insights into the Competition Between Cation-Exchange and Metal Ion Reduction

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Research paper thumbnail of Atomic Structure of Quantum Gold Nanowires: Quantification of the Lattice Strain

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Research paper thumbnail of Insulating State and Breakdown of Fermi Liquid Description in Molecular- Scale Single-Crystalline Wires of Gold

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Research paper thumbnail of Thermally Controlled Cyclic Insertion/Ejection of Dopant Ions and Reversible Zinc Blende/Wurtzite Phase Changes in ZnS Nanostructures

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Research paper thumbnail of Nanoscale Heterostructures with Molecular-Scale Single-Crystal Metal Wires

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Research paper thumbnail of Ultrafast Microwave-Assisted Route to Surfactant-Free Ultrafine Pt Nanoparticles on Graphene: Synergistic Co-reduction Mechanism and High Catalytic Activity

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Research paper thumbnail of ZnO–Au nanohybrids by rapid microwave-assisted synthesis for CO oxidation

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Research paper thumbnail of Pristine, adherent ultrathin gold nanowires on substrates and between pre-defined contacts via a wet chemical route

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Research paper thumbnail of Nanoscale ZnO/CdS heterostructures with engineered interfaces for high photocatalytic activity under solar radiation

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Research paper thumbnail of Formation and Thermal Stability of Gold–Silica Nanohybrids: Insight into the Mechanism and Morphology by Electron Tomography

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Research paper thumbnail of Tunability of Electronic States in Ultrathin Gold Nanowires

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Research paper thumbnail of Tunability of electronic states

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Research paper thumbnail of Existing and emerging strategies for the synthesis of nanoscale heterostructures

Physical Chemistry Chemical Physics, 2011

Development of new multifunctional nanostructures relies on the ability to make new materials at ... more Development of new multifunctional nanostructures relies on the ability to make new materials at the nanoscale with control over size, shape and composition. While this control is extremely important to tune several properties, an alternative strategy is to create active interfaces between two or more nanostructures to form nanoscale heterostructures. In these heterostructures, the interfaces play a key role in stabilizing and enhancing the efficiency of the individual components for various applications. In this article, we discuss synthesis methods of different types of nanoscale heterostructures and the role of interfaces in various applications. We present the current state-of-the-art in designing heterostructures and possible upcoming synthetic strategies with their advantages and disadvantages. We present how such heterostructures are highly efficient for catalytic, photovoltaic and nanoelectronic applications drawing several examples from our own studies and from the literature.

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Research paper thumbnail of Directed Synthesis of Rocksalt AuCl Crystals

Journal of Physical Chemistry C, 2009

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Research paper thumbnail of 3D Au-SiO2 Nanohybrids as a Potential Scaffold Coating Material for Neuroengineering

RSC Adv., 2016

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Nanoscale Heterostructures Based on ZnO with Enhanced Visible Light Harvesting Efficiency

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Nanoscale Interconnects by Nucleation: Site-Specific Attachment of Molecular Scale Au Nanowire

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Functional Nanohybrids with Engineered Interfaces

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Pristine nanomaterials: synthesis, stability and applications

Nanoscale, 2013

Bookmarks Related papers MentionsView impact

Research paper thumbnail of New Insights into Selective Heterogeneous Nucleation of Metal Nanoparticles on Oxides by Microwave-Assisted Reduction: Rapid Synthesis of High-Activity Supported Catalysts

ACS Nano, 2011

Microwave-based methods are widely employed to synthesize metal nanoparticles on various substrat... more Microwave-based methods are widely employed to synthesize metal nanoparticles on various substrates. However, the detailed mechanism of formation of such hybrids has not been addressed. In this paper, we describe the thermodynamic and kinetic aspects of reduction of metal salts by ethylene glycol under microwave heating conditions. On the basis of this analysis, we identify the temperatures above which the reduction of the metal salt is thermodynamically favorable and temperatures above which the rates of homogeneous nucleation of the metal and the heterogeneous nucleation of the metal on supports are favored. We delineate different conditions which favor the heterogeneous nucleation of the metal on the supports over homogeneous nucleation in the solvent medium based on the dielectric loss parameters of the solvent and the support and the metal/solvent and metal/support interfacial energies. Contrary to current understanding, we show that metal particles can be selectively formed on the substrate even under situations where the temperature of the substrate is lower than that of the surrounding medium. The catalytic activity of the Pt/CeO(2) and Pt/TiO(2) hybrids synthesized by this method for H(2) combustion reaction shows that complete conversion is achieved at temperatures as low as 100 °C with Pt-CeO(2) catalyst and at 50 °C with Pt-TiO(2) catalyst. Our method thus opens up possibilities for rational synthesis of high-activity supported catalysts using a fast microwave-based reduction method.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Au 2 S x /CdS Nanorods by Cation Exchange: Mechanistic Insights into the Competition Between Cation-Exchange and Metal Ion Reduction

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Atomic Structure of Quantum Gold Nanowires: Quantification of the Lattice Strain

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Insulating State and Breakdown of Fermi Liquid Description in Molecular- Scale Single-Crystalline Wires of Gold

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Thermally Controlled Cyclic Insertion/Ejection of Dopant Ions and Reversible Zinc Blende/Wurtzite Phase Changes in ZnS Nanostructures

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Nanoscale Heterostructures with Molecular-Scale Single-Crystal Metal Wires

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Ultrafast Microwave-Assisted Route to Surfactant-Free Ultrafine Pt Nanoparticles on Graphene: Synergistic Co-reduction Mechanism and High Catalytic Activity

Bookmarks Related papers MentionsView impact

Research paper thumbnail of ZnO–Au nanohybrids by rapid microwave-assisted synthesis for CO oxidation

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Pristine, adherent ultrathin gold nanowires on substrates and between pre-defined contacts via a wet chemical route

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Nanoscale ZnO/CdS heterostructures with engineered interfaces for high photocatalytic activity under solar radiation

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Formation and Thermal Stability of Gold–Silica Nanohybrids: Insight into the Mechanism and Morphology by Electron Tomography

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Tunability of Electronic States in Ultrathin Gold Nanowires

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Tunability of electronic states

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Existing and emerging strategies for the synthesis of nanoscale heterostructures

Physical Chemistry Chemical Physics, 2011

Development of new multifunctional nanostructures relies on the ability to make new materials at ... more Development of new multifunctional nanostructures relies on the ability to make new materials at the nanoscale with control over size, shape and composition. While this control is extremely important to tune several properties, an alternative strategy is to create active interfaces between two or more nanostructures to form nanoscale heterostructures. In these heterostructures, the interfaces play a key role in stabilizing and enhancing the efficiency of the individual components for various applications. In this article, we discuss synthesis methods of different types of nanoscale heterostructures and the role of interfaces in various applications. We present the current state-of-the-art in designing heterostructures and possible upcoming synthetic strategies with their advantages and disadvantages. We present how such heterostructures are highly efficient for catalytic, photovoltaic and nanoelectronic applications drawing several examples from our own studies and from the literature.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Directed Synthesis of Rocksalt AuCl Crystals

Journal of Physical Chemistry C, 2009

Bookmarks Related papers MentionsView impact

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