A5077480299- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Advanced Thermoelectric Materials and Devices
- Supramolecular Self-Assembly in Materials
- Crystallography and molecular interactions
- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- 2D Materials and Applications
- Thermal properties of materials
- Chemical Synthesis and Analysis
- Luminescence and Fluorescent Materials
- Chalcogenide Semiconductor Thin Films
- Antimicrobial Peptides and Activities
- Polydiacetylene-based materials and applications
- Nanoplatforms for cancer theranostics
- Mechanical and Optical Resonators
- Silicone and Siloxane Chemistry
- Molecular Sensors and Ion Detection
- Metal-Organic Frameworks: Synthesis and Applications
- Photochromic and Fluorescence Chemistry
- Porphyrin and Phthalocyanine Chemistry
- Groundwater and Isotope Geochemistry
- Advanced Sensor and Control Systems
- Magneto-Optical Properties and Applications
- Adsorption and biosorption for pollutant removal
Institute of Science and Technology Austria
2025
Tata Institute of Fundamental Research
2024
École Nationale Supérieure d'Ingénieurs de Caen
2021-2024
Normandie Université
2021-2024
Centre National de la Recherche Scientifique
2021-2024
Université de Caen Normandie
2021-2024
Jawaharlal Nehru Centre for Advanced Scientific Research
2019-2023
Jadavpur University
2023
Maulana Abul Kalam Azad University of Technology, West Bengal
2023
Laboratoire de Cristallographie et Sciences des Matériaux
2023
Chemical bonding present in crystalline solids has a significant impact on how heat moves through lattice, and with the right chemical tuning, one can achieve extremely low thermal conductivity. The desire for intrinsically lattice conductivity (κlat) gained widespread attention thermoelectrics, refractories, nowadays photovoltaics optoelectronics. Here we have synthesized high-quality ingot of cubic metal halide CuBiI4 explored its transport properties. It exhibits an ultralow κlat...
Understanding the relationship between crystal structure, chemical bonding, and lattice dynamics is crucial for design of materials with low thermal conductivities, which are essential in fields as diverse thermoelectrics, barrier coatings, optoelectronics. The bismuthinite-aikinite series, Cu1-x□xPb1-xBi1+xS3 (0 ≤ x 1, where □ represents a vacancy), has recently emerged family n-type semiconductors exceptionally conductivities. We present detailed investigation electronic properties,...
BODIPY (4,4-difluoro-4-bora-3a,4a-diaza-s-indacene) derivatives have attracted attention as probes in applications like imaging and sensing due to their unique properties (1) strong absorption emission the visible near-infrared regions of electromagnetic spectrum, (2) fluorescence (3) supreme photostability. They also been employed areas photodynamic therapy. Over last decade, BODIPY-based molecules even emerged candidates for cancer treatments. Cancer remains a significant health issue...
Thermoelectric coolers (TECs) are pivotal in modern heat management but face limitations efficiency and manufacturing scalability. We address these challenges by using an extrusion-based 3D printing technique to fabricate high-performance thermoelectric materials. Our ink formulations ensure the integrity of 3D-printed structure effective particle bonding during sintering, achieving record-high figure merit (zT) values 1.42 for p-type bismuth antimony telluride [(Bi,Sb)2Te3] 1.3 n-type...
Understanding the mechanisms that connect heat transport with crystal structures is fundamental to develop materials optimized electrical and thermal properties for thermoelectric applications. In this work, we synthesized a series of bulk Cl-doped PbBi2S4 by mechanical alloying combined spark plasma sintering. A detailed structural analysis (m = 1 member PbmBi2S3+m) compounds Bi2S3 0) Pb3Bi2S6 3) shows low dimensionality their frameworks induced stereochemical activity Bi3+ Pb2+ 6s2 lone...
Copper-rich sulfides are very promising for energy conversion applications due to their environmental compatibility, cost effectiveness, and earth abundance. Based on a comparative analysis of the structural transport properties Cu3BiS3 with those tetrahedrite (Cu12Sb4S13) other Cu-rich sulfides, we highlight role cationic coordination types networks electrical thermal properties. By precession-assisted 3D electron diffraction analysis, find high anisotropic vibration copper attributed its...
Two-dimensional (2D) lead-free halide perovskites have generated enormous perception in the field of optoelectronics due to their fascinating optical properties. However, an in-depth understanding on shape-controlled charge-carrier recombination dynamics is still lacking, which could be resolved by exploring photoluminescence (PL) blinking behaviour at single-particle level. Herein, we demonstrate, for first time, synthesis nanocrystals (NCs) and 2D nanosheets (NSs) layered mixed halide, Cs3...
Cu–Sn-based sulfides are earth-abundant and nontoxic compounds of special interest for low-cost energy harvesting applications. In the present work, we have investigated effect grain size on thermoelectric properties Cu2SnS3 (CTS). Three dense CTS samples with nanometric grains were produced by mechanical alloying combined spark plasma sintering, preserving small crystalline domains to 12, 25, 37 nm, respectively. The experimental results show that Seebeck coefficient (S) electrical...
Understanding the mechanism that connects heat transport with crystal structures and order/disorder phenomena is crucial to develop materials ultralow thermal conductivity (κ), for thermoelectric barrier applications, requires study of highly pure materials. We synthesized n-type sulfide CuPbBi5S9 an κ value 0.6-0.4 W m-1 K-1 in temperature range 300-700 K. In contrast prior studies, we show this synthetic does not exhibit ordered gladite mineral structure but instead forms a...
Highly sensitive, broadband bolometers are of great interest because their versatile usage in wide areas starting from dark matter search, radio astronomy, material science, and qubit readouts cQED experiments. There have been different realizations using superconducting thin films, nanowires, quantum dots, various 2D materials the recent past. The challenge is to a single device that combines high sensitivity, broad bandwidth, fast readout mechanism, low noise. Here we demonstrate first...
Donor-doped TiO2 ceramics are promising high-temperature oxide thermoelectrics. Highly dense (1 - x)TiO2-xNb2O5 (0.005 ≤ x 0.06) were prepared by a single-step, mixed-oxide route under reducing conditions. The microstructures contained polygonal-shaped grains with uniform grain size distributions. Subgrain structures formed in samples low Nb contents the interlacing of rutile and higher-order Magnéli phases, reflecting high density shear planes oxygen vacancies. Samples higher content showed...
Two-dimensional (2D) layered Ruddlesden–Popper (RP) phases of halide perovskite offer exotic properties and interesting structure, which make them suitable candidates for solar photovoltaics, light emitting diodes (LEDs), photodetector applications. Simple scaled-up synthesis, chemical transformations, doping, stability are the important steps toward Herein, all-inorganic RP phase Cs2PbI2Cl2 was synthesized via a facile hot-injection method using benzoyl halides as sources. Different...
Heterostructures of inorganic halide perovskites with mixed-dimensional nanomaterials have shown great potential not only in the field optoelectronic energy devices and photocatalysis but also for improving our fundamental understanding charge transfer across heterostructure interface. Herein, we present first time integration CsPbBr3 nanocrystal an N-doped carbon dot. We explore photoluminescence (PL) photoconductivity nanocrystals dots. PL quenching addition dots was observed. The...
Significantly enhanced thermoelectric performance of Nb-doped TiO2 ceramics has been achieved through in-situ formation β-Sn grain boundary inclusions. The were prepared by mixed oxide route and sintered at 1473 K (lower than usual for TiO2) strongly reducing conditions. All sample microstructures contain a high density structured inclusions boundaries which assist densification. A variety crystalline defects occur inside the rutile grains; nano-regions with severe lattice distortion....
Solvent interaction has a significant effect on the molecular motions, folding and self-assembly of short aromatic γ-peptides that leads to change in initial helical conformation.
Abstract The dipeptides 1–4 with a triazole containing synthetic amino acid and Leu/ Phe/ Val/ Gly have been designed synthesized as potent antileishmanial agent. 1‐(2‐Amino‐phenyl)‐1H‐[1, 2,3] triazole‐4‐carboxylic was using click chemistry approach. From X‐ray crystallography, the peptide 1 Leu residue at C‐terminus adopts kink like structure but there is no intramolecular hydrogen bond. So, bonding sites are free allowed for intermolecular interaction guests. phenylalanine analogue 2...
The laser directed self-assembled diphenylanaline microstructures display prominent spectrally asymmetric Fano resonances in the waveguiding response to broadband light.
Ordered self-assemblies of hybrid molecules have potential as protective umbrellas against environmental pollution and corrosion. This article describes the design fabrication a new self-cleaning molecular material containing polyhedral oligomeric silsesquioxane (POSS) diphenylalanine hydrophobic pollution-protective coating. The colorless organic-inorganic materials, in which motif controls self-assembly, exhibit unique water resistance property enhance mechanical strength paper 1.5-fold....
Rapid industrialization has led to the release of hexavalent chromium (Cr(VI)), a "Class A" human carcinogen, mutagen, and teratogen in biological systems. Current adsorbents like anionic exchange resins metal–organic frameworks can remove harmful heavy metal oxyanions from water but are not stable broad pH range, suffer selectivity, cannot capture them trace values below tolerance limits given by U.S. EPA (100 ppb) WHO (50 ppb). Herein, we have synthesized nature-inspired coral-like...
Ordered self-assembly of small organic molecules may induce novel properties in a supramolecular arrangement and can act as advance functional materials. This paper discusses the development new stimuli-responsive dipeptide hydrogelator containing l-phenylalanine α-aminoisobutyric acid (Aib). The Boc-Phe-Aib-OH, on addition with three equivalent sodium hydroxide water, transformed into robust hydrogel. transparent hydrogel is self-healing nature. instant gelation highly selective toward does...
The superconducting coplanar waveguide (SCPW) cavity plays an essential role in various areas like qubits, parametric amplifiers, radiation detectors, and studying magnon-photon photon-phonon coupling. Despite its wide-ranging applications, the use of SCPW cavities to study van der Waals 2D materials has been relatively unexplored. resonant modes exquisitely sense dielectric environment. In this work, we measure charge compressibility bilayer graphene coupled a half-wavelength cavity. Our...
A peptidomimetic compound self-assembles to form spider silk-like soft fibers at 20 °C upon contact with air and the can be used mimic a web.
Light has been used as trigger for modulation of supramolecular assembly hybrid peptides followed by charge transfer complex formation and organogelation.