Sreeram P R

Indian Institute of Technology Kharagpur | IIT KGP · Department of Metallurgical and Materials Engineering

Earth’s abundant lead sulfide (PbS) is gaining increasing attention for its thermoelectric properties, particularly in converting heat into electricity at room to mid-temperatures. While several studies have reported enhancements in the thermoelectric figure of merit, commonly referred to as the figure of merit, ZT, for bulk PbS through alloying, i...

A novel high‐entropy alloy based on zirconium (Zr) and titanium (Ti) within the half‐Heusler (hH) system is successfully synthesized via arc melting followed by heat treatment. Structural and microstructural analyses are conducted utilizing scanning electron microscopy, electron probe microanalysis, and X‐Ray diffractometry, revealing a cubic hH st...

2D FeS 2 has the potential to convert ambient radiofrequency electromagnetic radiation signals into usable energy, which can be utilized to power portable and wearable electronic devices.

The high‐entropy concept, extensively studied in alloys and ceramics, has produced intriguing results, but its use in thermoelectric materials is still in its infancy. This study introduces a pioneering high‐entropy half‐Heusler (hH) alloy, ZrTiNiFeSnSb, synthesized via arc melting and heat treatment. Phonon scattering from multiple elements signif...

This study delves into the profound influence of defects and their evolution within the microstructure on the thermoelectric transport properties, with a primary focus on the Bi–Cu–Te ternary system. By systematically investigating the intricate relationships between composition, microstructure, and thermoelectric properties, this research offers a...

Hydrogen sulfide is a hazardous gas that is found in common industrial waste sources, including sewage and oil refineries; it is lethal at concentrations exceeding 100 ppm. Two-dimensional (2D) oxide materials with high surface area and environmental stability can be utilized for ultralow concentration gas sensing (H2S gas). Here, we demonstrate th...

As a natural polymer, cellulose is abundant, low-cost, robust, and biodegradable and can be chemically modified. This work explores the enhancement of mechanical, thermal, and flexoelectric properties of three-dimensional (3D)-printed carboxymethyl cellulose (CMC) due to the addition of mechanically exfoliated hexagonal boron nitride (hBN). hBN was...

Radiofrequency (RF) energy harvesting is receiving increased attention in today's digital era due to its potential to replace or improve the longevity of energy storage devices in low-power IoT devices. RF energy is available in the ambient environment, but efficient devices are still not commonly known for RF energy harvesting applications. Here,...

The development of nanotechnology has been advancing for decades and gained acceleration in the twenty-first century. Two-dimensional (2D) materials are widely available, giving them a wide range of material platforms for technological study and the advancement of atomic-level applications. The design and application of 2D materials are discussed i...

Compounds belonging to the series PbSbxTe1−x and Pb1−xSbxTe (x = 0.1, 0.3, 0.5) were prepared in the nanostructured form by employing high-energy ball-milling and subsequent hot-pressing. The amphoteric property of antimony was utilized to substitute lead and tellurium in the compounds having the formula PbSbxTe1−x and Pb1−xSbxTe to make them p and...

Manganese telluride is a good thermoelectric material for medium temperature applications. Pristine MnTe is a p-type semiconductor with an average hole concentration of 1019cm−3. Many dopants like Sodium, Copper and Sulphur were incorporated in the MnTe and their thermoelectric properties were studied. Antimony is an ideal dopant to alter the therm...

Technologically relevant highly rectifying all transparent delafossite pn homojunctions with CuInO2 as n-type layer and Ca doped CuInO2 as p-type layer are fabricated by oxygen plasma assisted thermal evaporation method. The best diode gives a forward to reverse current ratio ~619, which is about 62 times than that reported to date in a delafossite...