Somobrata Acharya | Indian Association for the Cultivation of Science (original) (raw)

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Papers by Somobrata Acharya

Research paper thumbnail of Enhanced gas sensing performance of graphene/ZnS-CdS hetero-nanowires gas sensor synthesized by Langmuir-Blodgett self-assembly method

Journal of Physics: Conference Series, 2017

Research paper thumbnail of Aspects of One‐Dimensional Nanostructures: Synthesis, Characterization, and Applications

Research paper thumbnail of Large Stokes shifted quaternary copper cadmium sulfide selenide quantum dot waveguides

Journal of Materials Chemistry C, 2021

We report on colloidal synthesis of quaternary alloyed I–II–VI2 copper cadmium sulfide selenide q... more We report on colloidal synthesis of quaternary alloyed I–II–VI2 copper cadmium sulfide selenide quantum dots (QDs) with bright, stable photoluminescence. We fabricate transparent, flexible optical waveguide to transmit photoluminescence of the QDs.

Research paper thumbnail of Virstatin-Conjugated Gold Nanoparticle with Enhanced Antimicrobial Activity against the Vibrio cholerae El Tor Biotype

Because of the emergence of multidrug-resistant pathogenic bacteria, there is a growing interest ... more Because of the emergence of multidrug-resistant pathogenic bacteria, there is a growing interest for the development of an efficient alternative to antibiotics. Gold nanoparticles (AuNPs) are promising candidates due to their inherent non-toxicity and can be used as effective carriers of drugs. Cholera caused by Gram-negative Vibrio cholerae is still a potential threat in many developing countries. Virstatin, a small molecule, has been reported to inhibit virulence regulation in V. cholerae. Herein, we report an efficient synthesis of virstatin-conjugated gold nanoparticles (VL-AuNPs) and their antibacterial efficacy against the El Tor biotype of V. cholerae (VcN16961). The spherical-shaped NPs have an average diameter of ∼17 nm. The uniqueness of VL-AuNPs relies in the enhanced antibacterial efficacy compared to virstatin, as evidenced from the inhibitory concentration obtained from growth kinetics, and attributed to the inhibition of ATPase activity and DNA damage. More importantly, the expression of cholera toxin, the most important virulence factor of V. cholera, is reduced to a far greater extent than by any of the component molecules. The effect of VL-AuNPs on VcN16961 was monitored using various assays such as confocal microscopy, FACS, fluorescence spectroscopy, and so on. Overall, VL-AuNPs could be a potential candidate for the use as an effective agent for combating diarrheal diseases caused by V. cholera.

Research paper thumbnail of Transparent, flexible MAPbI3 perovskite microwire arrays passivated with ultra-hydrophobic supramolecular self-assembly for stable and high-performance photodetectors

Nanoscale, 2020

Fully transparent perovskite microwire arrays passivated with supramolecular assembly for stable ... more Fully transparent perovskite microwire arrays passivated with supramolecular assembly for stable and high-performance photodetectors.

Research paper thumbnail of Synthesis of High Molecular Weight 1,4-Polynaphthalene for Solution-Processed True Color Blue Light Emitting Diode

Research paper thumbnail of First principles study of the electronic structure and bonding of Mn2

The Journal of Chemical Physics, 2008

We have examined the electronic structure and bonding of the Mn2 molecule through multireference ... more We have examined the electronic structure and bonding of the Mn2 molecule through multireference variational calculations coupled with augmented quadruple correlation consistent basis sets. The Mn atom has a 6S(4s23d5) ground state with its first excited state, 6D(4s13d6), located 2.145 eV higher. For all six molecular states 1Sigmag+, 3Sigmau+, 5Sigmag+, 7Sigmau+, 9Sigmag+, and 11Sigmau+(1) correlating to Mn(6S)+Mn(6S), and for six

Research paper thumbnail of Aggregation induction of tetraphenylethylene AIEgen and its supramolecular aggregates toward light-emitting diodes

Journal of Solid State Chemistry, 2020

Research paper thumbnail of Studies of Langmuir and Langmuir–Blodgett films of NLO-active amphiphilic 1,3-indanedione derivatives

New Journal of Chemistry, 2005

Research paper thumbnail of Synthesis, Two-Dimensional Assembly, and Surface Pressure-Induced Coalescence of Ultranarrow PbS Nanowires

Research paper thumbnail of Postsynthesis Spontaneous Coalescence of Mixed-Halide Perovskite Nanocubes into Phase-Stable Single-Crystalline Uniform Luminescent Nanowires

The Journal of Physical Chemistry Letters, 2019

Research paper thumbnail of Polarization Properties and Switchable Assembly of Ultranarrow ZnSe Nanorods

Research paper thumbnail of Supramolecular Organization of Ultra-narrow PbS Nanowires into Dimension Controlled Sheets Comparable to Three Layers of Graphene

Research paper thumbnail of Solution phase synthesis of large-area ultra-thin two dimensional layered Bi2Se3: role of Cu-intercalation and substitution

Materials Research Express

Research paper thumbnail of Self-Powered Sensors and Flexible Triboelectric Nanogenerator for Powering Portable Electronics

Journal of Nanoscience and Nanotechnology

Research paper thumbnail of Mesoporous fullerene C70 cubes with highly crystalline frameworks and unusually enhanced photoluminescence properties

Materials Horizons

Self-assembled mesoporous fullerene C70 cube-shaped crystals with crystalline frameworks displaye... more Self-assembled mesoporous fullerene C70 cube-shaped crystals with crystalline frameworks displayed enhanced PL intensity (around 15 times higher intensity compared to bulk C70) due to the high degree of crystallinity in their pore walls.

Research paper thumbnail of Carbon Nanosheets by Morphology-Retained Carbonization of Two-Dimensional Assembled Anisotropic Carbon Nanorings

Angewandte Chemie International Edition

Research paper thumbnail of Induced Aggregation of AIE-Active Mono-Cyclometalated Ir(III) Complex into Supramolecular Branched Wires for Light-Emitting Diodes

Small, 2017

Aggregation-induced emission (AIE) is commonly observed in irregular bulk form. Herein, unique ag... more Aggregation-induced emission (AIE) is commonly observed in irregular bulk form. Herein, unique aggregation properties of an AIE-active complex into branched supramolecular wires are reported for the first time. Mono-cyclometalated Ir(III) complex shows in-plane J-aggregation at the air-water interface owing to the restriction of intramolecular vibration of bidentate phenylpyridinato and intramolecular rotations of monodentate triphenylphosphine ligands at air-water interface. As a consequence, a large enhancement of luminescence comparable to the solid state is obtained from the monolayers of supramolecular wires. This unique feature is utilized for the fabrication of light-emitting diodes with low threshold voltage using supramolecular wires as active layer. This study opens up the need of ordered assembly of AIE complexes to achieve optimal luminescence characteristics.

Research paper thumbnail of Chemical Tailoring of Band Offsets at the Interface of ZnSe–CdS Heterostructures for Delocalized Photoexcited Charge Carriers

The Journal of Physical Chemistry C, 2016

Research paper thumbnail of Biological activity of dendrimer–methylglyoxal complexes for improved therapeutic efficacy against malignant cells

RSC Adv., 2016

A facile strategy to synthesize polymer based conjugation of methylglyoxal which demonstrated inh... more A facile strategy to synthesize polymer based conjugation of methylglyoxal which demonstrated inhibition against malignant cells with desired selectivity can revolutionize the cancer treatment via minimizing the human health risks.

Research paper thumbnail of Enhanced gas sensing performance of graphene/ZnS-CdS hetero-nanowires gas sensor synthesized by Langmuir-Blodgett self-assembly method

Journal of Physics: Conference Series, 2017

Research paper thumbnail of Aspects of One‐Dimensional Nanostructures: Synthesis, Characterization, and Applications

Research paper thumbnail of Large Stokes shifted quaternary copper cadmium sulfide selenide quantum dot waveguides

Journal of Materials Chemistry C, 2021

We report on colloidal synthesis of quaternary alloyed I–II–VI2 copper cadmium sulfide selenide q... more We report on colloidal synthesis of quaternary alloyed I–II–VI2 copper cadmium sulfide selenide quantum dots (QDs) with bright, stable photoluminescence. We fabricate transparent, flexible optical waveguide to transmit photoluminescence of the QDs.

Research paper thumbnail of Virstatin-Conjugated Gold Nanoparticle with Enhanced Antimicrobial Activity against the Vibrio cholerae El Tor Biotype

Because of the emergence of multidrug-resistant pathogenic bacteria, there is a growing interest ... more Because of the emergence of multidrug-resistant pathogenic bacteria, there is a growing interest for the development of an efficient alternative to antibiotics. Gold nanoparticles (AuNPs) are promising candidates due to their inherent non-toxicity and can be used as effective carriers of drugs. Cholera caused by Gram-negative Vibrio cholerae is still a potential threat in many developing countries. Virstatin, a small molecule, has been reported to inhibit virulence regulation in V. cholerae. Herein, we report an efficient synthesis of virstatin-conjugated gold nanoparticles (VL-AuNPs) and their antibacterial efficacy against the El Tor biotype of V. cholerae (VcN16961). The spherical-shaped NPs have an average diameter of ∼17 nm. The uniqueness of VL-AuNPs relies in the enhanced antibacterial efficacy compared to virstatin, as evidenced from the inhibitory concentration obtained from growth kinetics, and attributed to the inhibition of ATPase activity and DNA damage. More importantly, the expression of cholera toxin, the most important virulence factor of V. cholera, is reduced to a far greater extent than by any of the component molecules. The effect of VL-AuNPs on VcN16961 was monitored using various assays such as confocal microscopy, FACS, fluorescence spectroscopy, and so on. Overall, VL-AuNPs could be a potential candidate for the use as an effective agent for combating diarrheal diseases caused by V. cholera.

Research paper thumbnail of Transparent, flexible MAPbI3 perovskite microwire arrays passivated with ultra-hydrophobic supramolecular self-assembly for stable and high-performance photodetectors

Nanoscale, 2020

Fully transparent perovskite microwire arrays passivated with supramolecular assembly for stable ... more Fully transparent perovskite microwire arrays passivated with supramolecular assembly for stable and high-performance photodetectors.

Research paper thumbnail of Synthesis of High Molecular Weight 1,4-Polynaphthalene for Solution-Processed True Color Blue Light Emitting Diode

Research paper thumbnail of First principles study of the electronic structure and bonding of Mn2

The Journal of Chemical Physics, 2008

We have examined the electronic structure and bonding of the Mn2 molecule through multireference ... more We have examined the electronic structure and bonding of the Mn2 molecule through multireference variational calculations coupled with augmented quadruple correlation consistent basis sets. The Mn atom has a 6S(4s23d5) ground state with its first excited state, 6D(4s13d6), located 2.145 eV higher. For all six molecular states 1Sigmag+, 3Sigmau+, 5Sigmag+, 7Sigmau+, 9Sigmag+, and 11Sigmau+(1) correlating to Mn(6S)+Mn(6S), and for six

Research paper thumbnail of Aggregation induction of tetraphenylethylene AIEgen and its supramolecular aggregates toward light-emitting diodes

Journal of Solid State Chemistry, 2020

Research paper thumbnail of Studies of Langmuir and Langmuir–Blodgett films of NLO-active amphiphilic 1,3-indanedione derivatives

New Journal of Chemistry, 2005

Research paper thumbnail of Synthesis, Two-Dimensional Assembly, and Surface Pressure-Induced Coalescence of Ultranarrow PbS Nanowires

Research paper thumbnail of Postsynthesis Spontaneous Coalescence of Mixed-Halide Perovskite Nanocubes into Phase-Stable Single-Crystalline Uniform Luminescent Nanowires

The Journal of Physical Chemistry Letters, 2019

Research paper thumbnail of Polarization Properties and Switchable Assembly of Ultranarrow ZnSe Nanorods

Research paper thumbnail of Supramolecular Organization of Ultra-narrow PbS Nanowires into Dimension Controlled Sheets Comparable to Three Layers of Graphene

Research paper thumbnail of Solution phase synthesis of large-area ultra-thin two dimensional layered Bi2Se3: role of Cu-intercalation and substitution

Materials Research Express

Research paper thumbnail of Self-Powered Sensors and Flexible Triboelectric Nanogenerator for Powering Portable Electronics

Journal of Nanoscience and Nanotechnology

Research paper thumbnail of Mesoporous fullerene C70 cubes with highly crystalline frameworks and unusually enhanced photoluminescence properties

Materials Horizons

Self-assembled mesoporous fullerene C70 cube-shaped crystals with crystalline frameworks displaye... more Self-assembled mesoporous fullerene C70 cube-shaped crystals with crystalline frameworks displayed enhanced PL intensity (around 15 times higher intensity compared to bulk C70) due to the high degree of crystallinity in their pore walls.

Research paper thumbnail of Carbon Nanosheets by Morphology-Retained Carbonization of Two-Dimensional Assembled Anisotropic Carbon Nanorings

Angewandte Chemie International Edition

Research paper thumbnail of Induced Aggregation of AIE-Active Mono-Cyclometalated Ir(III) Complex into Supramolecular Branched Wires for Light-Emitting Diodes

Small, 2017

Aggregation-induced emission (AIE) is commonly observed in irregular bulk form. Herein, unique ag... more Aggregation-induced emission (AIE) is commonly observed in irregular bulk form. Herein, unique aggregation properties of an AIE-active complex into branched supramolecular wires are reported for the first time. Mono-cyclometalated Ir(III) complex shows in-plane J-aggregation at the air-water interface owing to the restriction of intramolecular vibration of bidentate phenylpyridinato and intramolecular rotations of monodentate triphenylphosphine ligands at air-water interface. As a consequence, a large enhancement of luminescence comparable to the solid state is obtained from the monolayers of supramolecular wires. This unique feature is utilized for the fabrication of light-emitting diodes with low threshold voltage using supramolecular wires as active layer. This study opens up the need of ordered assembly of AIE complexes to achieve optimal luminescence characteristics.

Research paper thumbnail of Chemical Tailoring of Band Offsets at the Interface of ZnSe–CdS Heterostructures for Delocalized Photoexcited Charge Carriers

The Journal of Physical Chemistry C, 2016

Research paper thumbnail of Biological activity of dendrimer–methylglyoxal complexes for improved therapeutic efficacy against malignant cells

RSC Adv., 2016

A facile strategy to synthesize polymer based conjugation of methylglyoxal which demonstrated inh... more A facile strategy to synthesize polymer based conjugation of methylglyoxal which demonstrated inhibition against malignant cells with desired selectivity can revolutionize the cancer treatment via minimizing the human health risks.