J. Narayan
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View article: Direct Laser Writing of Nucleation Sites for Patterned Diamond Growth
Direct Laser Writing of Nucleation Sites for Patterned Diamond Growth Open
Direct laser writing (3D printing) is rapidly emerging as a versatile method for fabricating novel 3D structures that are needed for quantum computing, superconducting devices, selective coatings, and biomedical sensors. Here, we have crea…
View article: Enhancement of the electrochemical performance of LiFePO4 cathode material by nanosecond laser annealing
Enhancement of the electrochemical performance of LiFePO4 cathode material by nanosecond laser annealing Open
Pulsed laser annealing of LiFePO 4 can improve conductivity by increasing oxygen vacancy-related defect concentration; this approach can improve the current carrying capacity of LIB cathodes from 135 to 145 mAh g −1 under optimized conditi…
View article: Large‐Area Growth of Ferromagnetic Q‐Carbon Thin Films
Large‐Area Growth of Ferromagnetic Q‐Carbon Thin Films Open
Plasma‐enhanced chemical vapor deposition (PECVD)‐assisted growth of undoped Q‐carbon films over a large area for wafer‐scale integration of diamond thin films and related structures is reported. A detailed mechanism is proposed to describ…
View article: Novel Q-Carbon Anodes for Sodium-Ion Batteries
Novel Q-Carbon Anodes for Sodium-Ion Batteries Open
The lack of a standard anode for sodium-ion batteries (SIBs) has greatly hindered their applications. Herein, we show that a novel phase of carbon, namely Q-carbon, is an effective anode material for sodium-ion batteries. The Q-carbon, whi…
View article: Effect of Face Masks on Respiratory Parameters After Six Minute Walk Test in Apparently Healthy Individuals
Effect of Face Masks on Respiratory Parameters After Six Minute Walk Test in Apparently Healthy Individuals Open
Objectives: To see the effect of wearing of face masks on the oxygen saturation (SpO2) and respiratory rate after six minute walk test in apparently healthy individuals. Materials and Methods: Cross sectional study, Clearance from the ethi…
View article: Enhanced optical transmittance and room temperature ferromagnetism in Al-doped zinc oxide epitaxial films
Enhanced optical transmittance and room temperature ferromagnetism in Al-doped zinc oxide epitaxial films Open
We present a systematic investigation of the detailed structural, optical and magnetic properties of ZnO thin films deposited by pulsed laser deposition as a function of varying Al doping from 0% to 5%. The observed features can be associa…
View article: Effect of smartphone use on sleep and mental health status of Indian medical students: a cross-sectional study
Effect of smartphone use on sleep and mental health status of Indian medical students: a cross-sectional study Open
Background: In today's digital era, technology plays an integral role in daily life, particularly among students facing significant health challenges associated with increased screen time. The increased screen usage has been linked to dete…
View article: Association of stress and primary hypothyroidism
Association of stress and primary hypothyroidism Open
A BSTRACT Background: Hypothyroidism is the result of impaired production and secretion of thyroid hormones. The cardiovascular system is affected by fluctuations in thyroid hormone levels. Stressful events or stressors can affect the hypo…
View article: Path for Room-Temperature Superconductivity in Q-Carbon-Related Materials
Path for Room-Temperature Superconductivity in Q-Carbon-Related Materials Open
We present the atomic structures and nonequilibrium synthesis of a new class of materials, where the basic structural unit is a diamond tetrahedron. When units of one, two, and three tetrahedra are randomly packed, we create distinct phase…
View article: Multifunctional carbon-based nanostructures (CBNs) for advanced biomedical applications – a perspective and review
Multifunctional carbon-based nanostructures (CBNs) for advanced biomedical applications – a perspective and review Open
Carbon-based nanostructures (CBNs) have attracted immense attention from biomedical researchers due to their unique combination of extraordinary mechanical, thermal, electrical, and optical properties.
View article: Correlation of Serum Uric Acid Levels with Certain Anthropometric Parameters in Prediabetic and Drug-naive Diabetic Subjects
Correlation of Serum Uric Acid Levels with Certain Anthropometric Parameters in Prediabetic and Drug-naive Diabetic Subjects Open
Introduction: Uric acid is produced during the metabolism of nucleotide and adenosine triphosphate and contains the final product of human purine metabolism. It acts both as an antioxidant and pro-inflammatory marker and has a positive ass…
View article: Path for Room-Temperature Superconductivity in Q-Carbon Related Materials
Path for Room-Temperature Superconductivity in Q-Carbon Related Materials Open
We present atomic structures and nonequilbrium synthesis of new class of materials, where the basic structural unit is a diamond tetrahedron. When units of one, two, and three tetrahedra are randomly packed, we create distinct phases of am…
View article: Synthesis and novel properties of Q-silicon
Synthesis and novel properties of Q-silicon Open
We report the discovery of Q-silicon with an atomic density of 60% higher than crystalline silicon while keeping the bonding characteristics the same as normal silicon. Distinct amorphous phases are created, when one, two, or three tetrahe…
View article: Path for Near Room-Temperature Superconductivity in Q-carbon Related Materials
Path for Near Room-Temperature Superconductivity in Q-carbon Related Materials Open
We present atomic structures and nonequilbrium synthesis of new class of materials, where the basic structural unit is a diamond tetrahedron. When units of one, two, and three tetrahedra are randomly packed, we create distinct phases of am…
View article: Nanosecond Laser Annealing of NMC 811 Cathodes for Enhanced Performance
Nanosecond Laser Annealing of NMC 811 Cathodes for Enhanced Performance Open
Improved performance of lithium-ion batteries (LIBs) plays a critical role in the future of next- generation battery applications. Nickel-rich layered oxides such as LiNi 0.8 Mn 0.1 Co 0.1 O 2 (NMC 811), are popular cathodes due to their h…
View article: Method for forming p-n junctions and solar-cells by laser-beam processing
Method for forming p-n junctions and solar-cells by laser-beam processing Open
This invention is an improved method for preparing p-n junction devices, such as diodes and solar cells. High-quality junctions are prepared by effecting laser-diffusion of a selected dopant into silicon by means of laser pulses having a w…
View article: Method for making defect-free zone by laser-annealing of doped silicon
Method for making defect-free zone by laser-annealing of doped silicon Open
This invention is a method for improving the electrical properties of silicon semiconductor material. The method comprises irradiating a selected surface layer of the semiconductor material with high-power laser pulses characterized by a s…
View article: Laser method for forming low-resistance ohmic contacts on semiconducting oxides
Laser method for forming low-resistance ohmic contacts on semiconducting oxides Open
This invention is a new method for the formation of high-quality ohmic contacts on wide-band-gap semiconducting oxides. As exemplified by the formation of an ohmic contact on n-type BaTiO.sub.3 containing a p-n junction, the invention enta…
View article: Domain epitaxy for thin film growth
Domain epitaxy for thin film growth Open
A method of forming an epitaxial film on a substrate includes growing an initial layer of a film on a substrate at a temperature T.sub.growth, said initial layer having a thickness h and annealing the initial layer of the film at a tempera…
View article: Production of crystalline refractory metal oxides containing colloidal metal precipitates and useful as solar-effective absorbers
Production of crystalline refractory metal oxides containing colloidal metal precipitates and useful as solar-effective absorbers Open
This invention is a new process for producing refractory crystalline oxides having improved or unusual properties. The process comprises the steps of forming a doped-metal crystal of the oxide; exposing the doped crystal in a bomb to a red…
View article: Fabricating Graphene Oxide/h-BN Metal Insulator Semiconductor Diodes by Nanosecond Laser Irradiation
Fabricating Graphene Oxide/h-BN Metal Insulator Semiconductor Diodes by Nanosecond Laser Irradiation Open
To employ graphene’s rapid conduction in 2D devices, a heterostructure with a broad bandgap dielectric that is free of traps is required. Within this paradigm, h-BN is a good candidate because of its graphene-like structure and ultrawide b…
View article: Discovery of Double Helix and Impact on Nanoscale to Mesoscale Crystalline Structures
Discovery of Double Helix and Impact on Nanoscale to Mesoscale Crystalline Structures Open
Screw dislocations play a significant role in the growth of crystalline structures by providing a continuous source of surface steps which represent available sites for crystal growth. Here, we show that pure screw dislocations can become …
View article: Fabrication of Q-Carbon Nanostructures, Diamond and Their Composites with Wafer-Scale Integration
Fabrication of Q-Carbon Nanostructures, Diamond and Their Composites with Wafer-Scale Integration Open
We report the formation of Q-carbon nanolayers, Q-carbon nanoballs, nanodiamonds, microdiamonds, and their composites by controlling laser and substrate variables. The choice of these parameters is guided by the SLIM (simulation of laser i…
View article: Atomic-Scale Insights on Large-Misfit Heterointerfaces in LSMO/MgO/c-Al2O3
Atomic-Scale Insights on Large-Misfit Heterointerfaces in LSMO/MgO/c-Al2O3 Open
Understanding the interfaces in heterostructures at an atomic scale is crucial in enabling the possibility to manipulate underlying functional properties in correlated materials. This work presents a detailed study on the atomic structures…