J. Mitra
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View article: Novel CuCo <sub>2</sub> O <sub>4</sub> photonic crystals for optical hydrogen sensing: catalyst-free detection and mechanistic insights <i>via in situ</i> Raman spectroscopy
Novel CuCo <sub>2</sub> O <sub>4</sub> photonic crystals for optical hydrogen sensing: catalyst-free detection and mechanistic insights <i>via in situ</i> Raman spectroscopy Open
We report the proof-of-concept optical sensor based on a photonic crystal of CuCo 2 O 4 and its mechanism using in situ raman spectroscopy. The detection of hydrogen gas, an emerging promising fuel, is achieved with novel and stable oxide …
View article: Engineering band selective absorption with epsilon-near-zero media in the infrared
Engineering band selective absorption with epsilon-near-zero media in the infrared Open
Band-selective absorption and emission of thermal radiation in the infrared are of interest due to applications in emissivity coatings, infrared sensing, thermo-photovoltaics and solar energy harvesting. The broadband nature of thermal rad…
View article: Epsilon near zero metal oxide based spectrally selective reflectors
Epsilon near zero metal oxide based spectrally selective reflectors Open
Epsilon near zero (ENZ) materials can contribute significantly to the advancement of spectrally selective coatings aimed at enhancing efficient use of solar radiation and thermal energy management. Here, we demonstrate a subwavelength thic…
View article: Enhancing hydrogen evolution reaction activity through defects and strain engineering in monolayer MoS<sub>2</sub>
Enhancing hydrogen evolution reaction activity through defects and strain engineering in monolayer MoS<sub>2</sub> Open
The synergistic creation of vacancy defects, along with strain-induced active sites is shown to enhance hydrogen evolution reaction (HER) performance of CVD-grown monolayer MoS 2 .
View article: Anisotropic transport and Negative Resistance in a polycrystalline metal-semiconductor (Ni-TiO2) hybrid
Anisotropic transport and Negative Resistance in a polycrystalline metal-semiconductor (Ni-TiO2) hybrid Open
We investigate anomalous electrical transport properties of a Ni-TiO2 hybrid system displaying a unique nanostructured morphology. The system undergoes an insulator to metal transition below 150 K with a low temperature metallic phase that…
View article: Anomalous Photoresponse in a Reduced Metal-Semiconductor Hybrid of Nickel and Titanium Oxide
Anomalous Photoresponse in a Reduced Metal-Semiconductor Hybrid of Nickel and Titanium Oxide Open
Eutectic NiTiO$_3$-TiO$_2$ samples and their H$_2$ reduced Ni-TiO$_2$ samples, where high aspect ratio TiO$_2$ nanostructures are axially decorated with nodular Ni globules, are thoroughly explored to understand their effect in photo-respo…
View article: Leveraging Plasmonic Hot Electrons to Quench Defect Emission in Metal -- Semiconductor Nanostructured Hybrids: Experiment and Modeling
Leveraging Plasmonic Hot Electrons to Quench Defect Emission in Metal -- Semiconductor Nanostructured Hybrids: Experiment and Modeling Open
Modeling light-matter interaction in hybrid plasmonic materials is vital to their widening relevance from optoelectronics to photocatalysis. Here, we explore photoluminescence from ZnO nanorods (ZNR) embedded with gold nanoparticles (Au NP…
View article: Frequency dependent impedance response analysis of nanocrystalline ZnO chemiresistors
Frequency dependent impedance response analysis of nanocrystalline ZnO chemiresistors Open
ZnO is a widely studied gas sensor material and is used in many commercial sensor devices. However, selectivity towards any particular gas remains an issue due to lack of complete knowledge of the gas sensing mechanism of oxide surfaces. I…
View article: Imaging with Raman photons: a novel use of mixed-mode spectroscopy
Imaging with Raman photons: a novel use of mixed-mode spectroscopy Open
Surface enhanced Raman spectroscopy is today an established technique used for chemical fingerprinting. Here, we showcase an engineered hierarchical substrate, in which the plasmonically active regions, restricted to a micron scale, two di…
View article: Symmetric domain segmentation in WS <sub>2</sub> flakes: correlating spatially resolved photoluminescence, conductance with valley polarization
Symmetric domain segmentation in WS <sub>2</sub> flakes: correlating spatially resolved photoluminescence, conductance with valley polarization Open
The incidence of intra-flake heterogeneity of spectroscopic and electrical properties in chemical vapour deposited (CVD) WS 2 flakes is explored in a multi-physics investigation via spatially resolved spectroscopic maps correlated with ele…
View article: Tailoring Infrared Absorption and Thermal Emission with Ultrathin Film Interferences in Epsilon‐Near‐Zero Media
Tailoring Infrared Absorption and Thermal Emission with Ultrathin Film Interferences in Epsilon‐Near‐Zero Media Open
Dispersion Engineering The cover artwork depicts infrared light incident on a surface at different angles, which is absorbed. Correspondingly, directional thermal emission occurs with a conical profile at the same angle at which light is i…
View article: Tailoring Infrared Absorption and Thermal Emission with Ultrathin Film Interferences in Epsilon‐Near‐Zero Media
Tailoring Infrared Absorption and Thermal Emission with Ultrathin Film Interferences in Epsilon‐Near‐Zero Media Open
Engineering modal dispersions of ultrathin, planar structures enables significant control over infrared perfect absorption (PA) and thermal emission characteristics. Herein, the optical response of ultrathin, low loss, epsilon‐near‐zero (E…
View article: Hyperspectral imaging with Raman scattered photons: A new paradigm in Raman analysis
Hyperspectral imaging with Raman scattered photons: A new paradigm in Raman analysis Open
Surface enhanced Raman spectroscopy, is a technique of fundamental importance to analytical science and technology where the amplified Raman spectrum of analytes is used for chemical fingerprinting. Here, we showcase an engineered hierarch…
View article: Enhancement of Photoacoustic Signal Strength with Continuous Wave Optical Pre-Illumination: A Non-Invasive Technique
Enhancement of Photoacoustic Signal Strength with Continuous Wave Optical Pre-Illumination: A Non-Invasive Technique Open
Use of portable and affordable pulse light sources (light emitting diodes (LED) and laser diodes) for tissue illumination offers an opportunity to accelerate the clinical translation of photoacoustic imaging (PAI) technology. However, imag…
View article: Selective Enhancement in Phonon Scattering leads to High Thermoelectric Figure of Merit in ZnO -- Graphene Oxide Core-shell Nanohybrids
Selective Enhancement in Phonon Scattering leads to High Thermoelectric Figure of Merit in ZnO -- Graphene Oxide Core-shell Nanohybrids Open
ZnO is a promising candidate as an environment friendly thermoelectric (TE) material. However, the poor TE figure of merit (zT) needs to be addressed to achieve significant TE efficiency for commercial applications. Here we demonstrate tha…
View article: Controlling the macroscopic electrical properties of reduced graphene\n oxide by nanoscale writing of electronic channels
Controlling the macroscopic electrical properties of reduced graphene\n oxide by nanoscale writing of electronic channels Open
The allure of all carbon electronics stems from the spread in physical\nproperties, across all its allotropes. The scheme also harbours unique\nchallenges, like tunability of band-gap, variability of doping and defect\ncontrol. Here, we ex…
View article: Thickness induced metal to insulator charge transport and unusual hydrogen response in granular palladium nanofilms
Thickness induced metal to insulator charge transport and unusual hydrogen response in granular palladium nanofilms Open
This work reports evolution of charge transport properties in granular ultra-thin films of palladium of varying thickness using hydrogen as an extra parameter to control the charge transport. A percolation model has been proposed which det…
View article: Negative photoresponse in ZnO–PEDOT:PSS nanocomposites and photogating effects
Negative photoresponse in ZnO–PEDOT:PSS nanocomposites and photogating effects Open
Reversible negative photoresponse or increase in resistance in nanocomposites of ZnO nanoparticles in a p-type polymer (PEDOT:PSS), under UV-Vis illumination is reported, contrary to that of planar heterojunction of the constituents.
View article: Spatially resolved photoresponse on individual ZnO nanorods: correlating morphology, defects and conductivity
Spatially resolved photoresponse on individual ZnO nanorods: correlating morphology, defects and conductivity Open
Electrically active native point defects have a significant impact on the optical and electrical properties of ZnO nanostructures. Control of defect distribution and a detailed understanding of their physical properties are central to desi…
View article: Zn interstitials and O vacancies responsible for n-type ZnO: what do the emission spectra reveal?
Zn interstitials and O vacancies responsible for n-type ZnO: what do the emission spectra reveal? Open
Evidencing interstitial Zn related defect states inside the conduction band of Zn-rich ZnO nanorods.