Abheek Datta | IISER-Kolkata - Academia.edu (original) (raw)

Papers by Abheek Datta

Nanoscale, 2021

Controlling the crystallinity of Ru NPs is essential for EMSI tuning in CuO supported Ru NPs for ... more Controlling the crystallinity of Ru NPs is essential for EMSI tuning in CuO supported Ru NPs for enhanced OER.

ACS Applied Nano Materials, 2020

Electronic metal–support interactions (EMSIs) in metallic nanoparticle (NP)-supported catalysts a... more Electronic metal–support interactions (EMSIs) in metallic nanoparticle (NP)-supported catalysts are responsible for these nanomaterials’ high-performance electronic and catalytic properties. However, the investigation of EMSIs at nanoscale under different environments has not been well studied. In this work, gas-phase synthesized Pt NP and thermally grown CuO nanowire (NW) EMSI evolution is characterized via X-ray photoelectron spectroscopy and PeakForce Kelvin probe force microscopy, in order to describe the chemical state and surface potential of the nanocatalysts. Changes in the system’s EMSIs after NP deposition and thermal annealing have important effects for different nanomaterials’ applications. A significant amount of charge transfer was observed on the CuO NWs after deposition of Pt NPs, which greatly enhanced the catalytic performance of this material for methanol oxidation. Heating the Pt NP–CuO NW system elevated the Pt oxidation states and slowed the charge transfer such that the system exhibited different CO gas sensing mechanisms at two different temperatures, one related to the EMSI at 200 °C and the other related to oxygen spillover at 250 °C. This description of the CuO-NW-supported Pt NP electronic interactions under different reaction environments highlights the importance of EMSI tailoring for supported Pt nanocatalysts.

RSC Advances, 2016

The growth stimulation of gram plants (Cicer arietinum) by water dispersible carbon nanostructure... more The growth stimulation of gram plants (Cicer arietinum) by water dispersible carbon nanostructures is found to be dependent on the latter's morphology.

Chem. Commun., 2014

Leaching resistant Pd–SiO2 microcubes are obtained by self-assembly of Pd@SiO2 nanoparticles only... more Leaching resistant Pd–SiO2 microcubes are obtained by self-assembly of Pd@SiO2 nanoparticles only above a threshold ≥0.2 wt% Pd.

Green Chemistry, 2015

The confinement of Pd nanoparticles inside porous carbon leads to enhanced redox properties and h... more The confinement of Pd nanoparticles inside porous carbon leads to enhanced redox properties and high reusability in methanol electro-oxidation reaction.

Journal of Nanoparticle Research, 2013

Waste cooking oil has daily deliberate hazardous effects on human health due to consumption of re... more Waste cooking oil has daily deliberate hazardous effects on human health due to consumption of re-cooked oil and on the environment from disposal of the waste oil. These hazards can be controlled if there are ways to economically convert the waste oils into industrially relevant materials. Large-scale controlled catalytic conversion of the waste natural oils to carbon nanowhiskers (CNWs; diameter: 98-191 nm, length: B2 lm) was achieved by a one-pot, environmentally friendly process. The no-cost CNWs consist of carbon spirals with spacing between two adjacent layers at 3.1 ± 0.2 nm and arranged perpendicular to the whisker axis. The reactions were performed inside a sealed container at 500-850°C and autogenic pressure for 4-10 h. It was demonstrated that the gaseous pressure from the decomposition of the fatty acids was crucial for formation of the semi-graphitic filamentous structures. The dilute acid-washed catalyst free CNWs were found to be negligibly toxic to the mammalian cells and can be localized inside the cell nucleus. The cellular internalization studies of the fluorescent CNWs demonstrated their viability as potential delivery vehicles into the mammalian cells.

Corrosion Science, 2013

Carbon microsphere (C-lS) ball bearings are prone to corrode after long exposure to oxidizing env... more Carbon microsphere (C-lS) ball bearings are prone to corrode after long exposure to oxidizing environments. $4.2 lm diameter C-lSs synthesized from waste engine oil (at 600 and 900°C) by dry autoclaving, were exposed to nitric acid (30 and 60 vol.%), piranha (H 2 SO 4 :H 2 O 2 60:40 and 90:10), base (NH 4 OH:H 2 O 2 15:30 and 30:15) and air oxidation at 300 and 450°C for 12-48 h. The oxidation processes were monitored by weight loss analyses, scanning electron microscopy, X-ray diffraction, Raman spectroscopy, chemical functionalization and electrical conductivity measurements. Crystallinity and higher graphitic content in the C-lSs results in better resistance to oxidation.

Chemistry of Materials, 2012

Although the magnetic phase diagrams of bulk and thin film samples of Pr 1−x Ca x MnO 3 (x ≤ 0.5)... more Although the magnetic phase diagrams of bulk and thin film samples of Pr 1−x Ca x MnO 3 (x ≤ 0.5) are widely explored, few works have been published on the magnetic properties of nanoparticles, especially in the lightly doped regime. In this paper, microwave irradiation was used to synthesize the Pr 0.977 Ca 0.023 MnO 3 and Pr 0.964 Ca 0.036 MnO 3 Manganite phases with Pnma space group in the form of anisotropic nanoparticles. The phase identification, structural characteristics, and formation of the nanostructures were analyzed by Rietveld analysis of the X-ray diffraction patterns, electron microscopy, and combining thermal analysis with infrared spectroscopy, respectively. Transport measurements on the annealed samples revealed the insulating nature, and electrical conduction occurs through thermally activated hopping of small polarons. The Mn−O c −Mn tilt angles in the MnO 6 octahedra show considerable flattening (160.9°and 167.6°for x = 0.023 and x = 0.036, respectively), possibly enhancing the electronic double exchange and promoting ferromagnetism. Ferromagnetic ordering of Mn spins was indeed observed below 109 K, and interestingly, the magnetic moment for x = 0.036 was 3.92 μ B /f.u. at 5 K, which is higher than the saturated Mn magnetic moment (3.8 μ B). The enhanced magnetization is attributed to ordering of the Pr spins.

Nanoscale Horizons, 2020

A new interaction triumvirate of N–Pt–Ti is established via ballistic bombardment of Pt nanoparti... more A new interaction triumvirate of N–Pt–Ti is established via ballistic bombardment of Pt nanoparticles on TiN films.

Physical Chemistry Chemical Physics, 2021

This work examines oxidation across heterogenous interfaces in the context of EMSI between cataly... more This work examines oxidation across heterogenous interfaces in the context of EMSI between catalytic nanoparticles and oxide supports.

The preset work started with a discussion bout the general ideas about nanoscience and nanotechno... more The preset work started with a discussion bout the general ideas about nanoscience and nanotechnology and their common applications in various fields in the first chapter. The synthesis techniques of functional nanomaterials especially catalyst materials and substrate scopes are described. Thereafter the basic materials which are used to prepare catalysts studied for this thesis i.e. Pd nanoparrticles (NPs), SiO2 and carbon are discussed in detail. In chapter 2 the synthesis and application of Pd-SiO2 microcubes towards heterogeneous Suzuki-Miyaura C-C coupling are discussed. In chapter 3 the effect of total confinement on the catalytic activity of Pd NPs towards methanol electrooxidation (MeOx) is discussed. In chapter 4 the activity of metal-free catalysts in MeOx reaction is discussed especially the effect of N and S doping in porous elemental carbon and its impact on the catalytic activity. In chapter 5 the synthesis and electrochemical application of metal free carbon dots (Cdo...

Electrocatalysis

AbstractDesigning novel and cost-effective material for electrochemical water splitting in neutra... more AbstractDesigning novel and cost-effective material for electrochemical water splitting in neutral pH are highly essential for the hydrogen production and useful fuel cell construction. Synthesis of the bifunctional and earth-abundant efficient catalyst systems for the same remains one of the biggest challenges to the science community. Herein, we report the electrodeposition of ternary Fe-Mo-P onto the surface of carbon cloth material to form a stable and highly active bifunctional catalyst towards electrochemical hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) at pH 7. A set of catalysts were prepared by varying the relative atomic ratio of the elements and the best catalytic activity was observed with 60 atomic % Fe in the electroplating bath which rivals that of Pt/C in the overall electrochemical water splitting. The best catalyst also shows 24-h stability in the overall electrochemical splitting of water which indicates the potential of this class of materials. Graphical Abstractᅟ

The Journal of Physical Chemistry C

Journal of Materials Chemistry A, 2016

Selected database of the synthetic methods, precursors used, diameter (dia.), quantum yield (QY) ... more Selected database of the synthetic methods, precursors used, diameter (dia.), quantum yield (QY) and application of carbon dots. Inductively Coupled Plasma-Mass Spectroscopy (ICP-MS) X-ray Diffraction (XRD) Patterns UV-Visible Absorption Spectra Photoluminescence (PL) Spectra Quantum Yield (QY) of the C-dots and G-dots Scheme of Conversion of Sucrose to 5-hydroxymethyl-2-furaldehyde (5-HMF) 13 C NMR of the 2.5 min Microwave Reaction of Sucrose, Oxalic acid and PVP

Although the magnetic phase diagrams of bulk and thin film samples of Pr 1−x Ca x MnO 3 (x ≤ 0.5)... more Although the magnetic phase diagrams of bulk and thin film samples of Pr 1−x Ca x MnO 3 (x ≤ 0.5) are widely explored, few works have been published on the magnetic properties of nanoparticles, especially in the lightly doped regime. In this paper, microwave irradiation was used to synthesize the Pr 0.977 Ca 0.023 MnO 3 and Pr 0.964 Ca 0.036 MnO 3 Manganite phases with Pnma space group in the form of anisotropic nanoparticles. The phase identification, structural characteristics, and formation of the nanostructures were analyzed by Rietveld analysis of the X-ray diffraction patterns, electron microscopy, and combining thermal analysis with infrared spectroscopy, respectively. Transport measurements on the annealed samples revealed the insulating nature, and electrical conduction occurs through thermally activated hopping of small polarons. The Mn−O c −Mn tilt angles in the MnO 6 octahedra show considerable flattening (160.9°and 167.6°for x = 0.023 and x = 0.036, respectively), possibly enhancing the electronic double exchange and promoting ferromagnetism. Ferromagnetic ordering of Mn spins was indeed observed below 109 K, and interestingly, the magnetic moment for x = 0.036 was 3.92 μ B /f.u. at 5 K, which is higher than the saturated Mn magnetic moment (3.8 μ B ). The enhanced magnetization is attributed to ordering of the Pr spins.

Nanoscale, 2021

Controlling the crystallinity of Ru NPs is essential for EMSI tuning in CuO supported Ru NPs for ... more Controlling the crystallinity of Ru NPs is essential for EMSI tuning in CuO supported Ru NPs for enhanced OER.

ACS Applied Nano Materials, 2020

Electronic metal–support interactions (EMSIs) in metallic nanoparticle (NP)-supported catalysts a... more Electronic metal–support interactions (EMSIs) in metallic nanoparticle (NP)-supported catalysts are responsible for these nanomaterials’ high-performance electronic and catalytic properties. However, the investigation of EMSIs at nanoscale under different environments has not been well studied. In this work, gas-phase synthesized Pt NP and thermally grown CuO nanowire (NW) EMSI evolution is characterized via X-ray photoelectron spectroscopy and PeakForce Kelvin probe force microscopy, in order to describe the chemical state and surface potential of the nanocatalysts. Changes in the system’s EMSIs after NP deposition and thermal annealing have important effects for different nanomaterials’ applications. A significant amount of charge transfer was observed on the CuO NWs after deposition of Pt NPs, which greatly enhanced the catalytic performance of this material for methanol oxidation. Heating the Pt NP–CuO NW system elevated the Pt oxidation states and slowed the charge transfer such that the system exhibited different CO gas sensing mechanisms at two different temperatures, one related to the EMSI at 200 °C and the other related to oxygen spillover at 250 °C. This description of the CuO-NW-supported Pt NP electronic interactions under different reaction environments highlights the importance of EMSI tailoring for supported Pt nanocatalysts.

RSC Advances, 2016

The growth stimulation of gram plants (Cicer arietinum) by water dispersible carbon nanostructure... more The growth stimulation of gram plants (Cicer arietinum) by water dispersible carbon nanostructures is found to be dependent on the latter's morphology.

Chem. Commun., 2014

Leaching resistant Pd–SiO2 microcubes are obtained by self-assembly of Pd@SiO2 nanoparticles only... more Leaching resistant Pd–SiO2 microcubes are obtained by self-assembly of Pd@SiO2 nanoparticles only above a threshold ≥0.2 wt% Pd.

Green Chemistry, 2015

The confinement of Pd nanoparticles inside porous carbon leads to enhanced redox properties and h... more The confinement of Pd nanoparticles inside porous carbon leads to enhanced redox properties and high reusability in methanol electro-oxidation reaction.

Journal of Nanoparticle Research, 2013

Waste cooking oil has daily deliberate hazardous effects on human health due to consumption of re... more Waste cooking oil has daily deliberate hazardous effects on human health due to consumption of re-cooked oil and on the environment from disposal of the waste oil. These hazards can be controlled if there are ways to economically convert the waste oils into industrially relevant materials. Large-scale controlled catalytic conversion of the waste natural oils to carbon nanowhiskers (CNWs; diameter: 98-191 nm, length: B2 lm) was achieved by a one-pot, environmentally friendly process. The no-cost CNWs consist of carbon spirals with spacing between two adjacent layers at 3.1 ± 0.2 nm and arranged perpendicular to the whisker axis. The reactions were performed inside a sealed container at 500-850°C and autogenic pressure for 4-10 h. It was demonstrated that the gaseous pressure from the decomposition of the fatty acids was crucial for formation of the semi-graphitic filamentous structures. The dilute acid-washed catalyst free CNWs were found to be negligibly toxic to the mammalian cells and can be localized inside the cell nucleus. The cellular internalization studies of the fluorescent CNWs demonstrated their viability as potential delivery vehicles into the mammalian cells.

Corrosion Science, 2013

Carbon microsphere (C-lS) ball bearings are prone to corrode after long exposure to oxidizing env... more Carbon microsphere (C-lS) ball bearings are prone to corrode after long exposure to oxidizing environments. $4.2 lm diameter C-lSs synthesized from waste engine oil (at 600 and 900°C) by dry autoclaving, were exposed to nitric acid (30 and 60 vol.%), piranha (H 2 SO 4 :H 2 O 2 60:40 and 90:10), base (NH 4 OH:H 2 O 2 15:30 and 30:15) and air oxidation at 300 and 450°C for 12-48 h. The oxidation processes were monitored by weight loss analyses, scanning electron microscopy, X-ray diffraction, Raman spectroscopy, chemical functionalization and electrical conductivity measurements. Crystallinity and higher graphitic content in the C-lSs results in better resistance to oxidation.

Chemistry of Materials, 2012

Although the magnetic phase diagrams of bulk and thin film samples of Pr 1−x Ca x MnO 3 (x ≤ 0.5)... more Although the magnetic phase diagrams of bulk and thin film samples of Pr 1−x Ca x MnO 3 (x ≤ 0.5) are widely explored, few works have been published on the magnetic properties of nanoparticles, especially in the lightly doped regime. In this paper, microwave irradiation was used to synthesize the Pr 0.977 Ca 0.023 MnO 3 and Pr 0.964 Ca 0.036 MnO 3 Manganite phases with Pnma space group in the form of anisotropic nanoparticles. The phase identification, structural characteristics, and formation of the nanostructures were analyzed by Rietveld analysis of the X-ray diffraction patterns, electron microscopy, and combining thermal analysis with infrared spectroscopy, respectively. Transport measurements on the annealed samples revealed the insulating nature, and electrical conduction occurs through thermally activated hopping of small polarons. The Mn−O c −Mn tilt angles in the MnO 6 octahedra show considerable flattening (160.9°and 167.6°for x = 0.023 and x = 0.036, respectively), possibly enhancing the electronic double exchange and promoting ferromagnetism. Ferromagnetic ordering of Mn spins was indeed observed below 109 K, and interestingly, the magnetic moment for x = 0.036 was 3.92 μ B /f.u. at 5 K, which is higher than the saturated Mn magnetic moment (3.8 μ B). The enhanced magnetization is attributed to ordering of the Pr spins.

Nanoscale Horizons, 2020

A new interaction triumvirate of N–Pt–Ti is established via ballistic bombardment of Pt nanoparti... more A new interaction triumvirate of N–Pt–Ti is established via ballistic bombardment of Pt nanoparticles on TiN films.

Physical Chemistry Chemical Physics, 2021

This work examines oxidation across heterogenous interfaces in the context of EMSI between cataly... more This work examines oxidation across heterogenous interfaces in the context of EMSI between catalytic nanoparticles and oxide supports.

The preset work started with a discussion bout the general ideas about nanoscience and nanotechno... more The preset work started with a discussion bout the general ideas about nanoscience and nanotechnology and their common applications in various fields in the first chapter. The synthesis techniques of functional nanomaterials especially catalyst materials and substrate scopes are described. Thereafter the basic materials which are used to prepare catalysts studied for this thesis i.e. Pd nanoparrticles (NPs), SiO2 and carbon are discussed in detail. In chapter 2 the synthesis and application of Pd-SiO2 microcubes towards heterogeneous Suzuki-Miyaura C-C coupling are discussed. In chapter 3 the effect of total confinement on the catalytic activity of Pd NPs towards methanol electrooxidation (MeOx) is discussed. In chapter 4 the activity of metal-free catalysts in MeOx reaction is discussed especially the effect of N and S doping in porous elemental carbon and its impact on the catalytic activity. In chapter 5 the synthesis and electrochemical application of metal free carbon dots (Cdo...

Electrocatalysis

AbstractDesigning novel and cost-effective material for electrochemical water splitting in neutra... more AbstractDesigning novel and cost-effective material for electrochemical water splitting in neutral pH are highly essential for the hydrogen production and useful fuel cell construction. Synthesis of the bifunctional and earth-abundant efficient catalyst systems for the same remains one of the biggest challenges to the science community. Herein, we report the electrodeposition of ternary Fe-Mo-P onto the surface of carbon cloth material to form a stable and highly active bifunctional catalyst towards electrochemical hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) at pH 7. A set of catalysts were prepared by varying the relative atomic ratio of the elements and the best catalytic activity was observed with 60 atomic % Fe in the electroplating bath which rivals that of Pt/C in the overall electrochemical water splitting. The best catalyst also shows 24-h stability in the overall electrochemical splitting of water which indicates the potential of this class of materials. Graphical Abstractᅟ

The Journal of Physical Chemistry C

Journal of Materials Chemistry A, 2016

Selected database of the synthetic methods, precursors used, diameter (dia.), quantum yield (QY) ... more Selected database of the synthetic methods, precursors used, diameter (dia.), quantum yield (QY) and application of carbon dots. Inductively Coupled Plasma-Mass Spectroscopy (ICP-MS) X-ray Diffraction (XRD) Patterns UV-Visible Absorption Spectra Photoluminescence (PL) Spectra Quantum Yield (QY) of the C-dots and G-dots Scheme of Conversion of Sucrose to 5-hydroxymethyl-2-furaldehyde (5-HMF) 13 C NMR of the 2.5 min Microwave Reaction of Sucrose, Oxalic acid and PVP

Although the magnetic phase diagrams of bulk and thin film samples of Pr 1−x Ca x MnO 3 (x ≤ 0.5)... more Although the magnetic phase diagrams of bulk and thin film samples of Pr 1−x Ca x MnO 3 (x ≤ 0.5) are widely explored, few works have been published on the magnetic properties of nanoparticles, especially in the lightly doped regime. In this paper, microwave irradiation was used to synthesize the Pr 0.977 Ca 0.023 MnO 3 and Pr 0.964 Ca 0.036 MnO 3 Manganite phases with Pnma space group in the form of anisotropic nanoparticles. The phase identification, structural characteristics, and formation of the nanostructures were analyzed by Rietveld analysis of the X-ray diffraction patterns, electron microscopy, and combining thermal analysis with infrared spectroscopy, respectively. Transport measurements on the annealed samples revealed the insulating nature, and electrical conduction occurs through thermally activated hopping of small polarons. The Mn−O c −Mn tilt angles in the MnO 6 octahedra show considerable flattening (160.9°and 167.6°for x = 0.023 and x = 0.036, respectively), possibly enhancing the electronic double exchange and promoting ferromagnetism. Ferromagnetic ordering of Mn spins was indeed observed below 109 K, and interestingly, the magnetic moment for x = 0.036 was 3.92 μ B /f.u. at 5 K, which is higher than the saturated Mn magnetic moment (3.8 μ B ). The enhanced magnetization is attributed to ordering of the Pr spins.