Chandra Sekhar Tiwary

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

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...

Antibiotic resistance and adverse reactions in humans can be avoided by detecting antibiotics early in the milk supply chain. To meet the demand, we developed a flexible and simple optical sensing method based on a non-van der Waals two-dimensional (2D) metal oxide, 2D-magnesiochromite (2D-MgCr2O4). We used a rapid, label-free Raman enhancement mec...

In this work, we decorated piezoresponsive atomically thin ZnO nanosheets on a polymer surface using additive manufacturing (three-dimensional (3D) printing) technology to demonstrate electrical-mechanical coupling phenomena. The output voltage response of the 3D-printed architecture was regulated by varying the external mechanical pressures. Addit...

The liquid-phase exfoliation (LPE) technique has been employed to prepare two-dimensional (2D) gallium telluride (Ga2Te3) nanosheets with an average thickness of ∼2.4 nm and linear optical properties, including UV–visible absorption and photoluminescence (PL) emission characteristics of the sample in the green wavelength region are reported. The th...

This study demonstrates two key concepts in the area of heterogeneous catalytic chemistry. One is the preparation of a high entropy alloy supported system/catalyst where unlike the conventional sol-gel process one of the components (metal) is already in a final form of metallic nanoparticle and the other component (oxide) needs to be prepared from...

For satisfying the ever-growing need in novel material search for energy storage applications, high entropy alloys (HEAs) have been explored recently. A simple induction melting method was used to synthesize the CoCrNiFeMn bulk HEA sample that was later ball-milled to obtain nanoparticles. The dimension reduction provided an increased surface area...

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...

Semiconductors play a critical role in optoelectronic applications, and recent research has identified group-VI 2D semiconductors as promising materials for this purpose. Here, we report the comprehensive excited state carrier dynamics of bilayer, two-dimensional (2D) selenium (Se) in one-photon and multi-photon absorption regimes using transient r...

Magnetism in atomically thin two-dimensional (2D) materials is attractive for several applications such as memory devices, sensors, biomedical devices, etc. Here, we have synthesized 2D manganese telluride (MnTe) using a scalable synthesis method consisting of melting followed by liquid phase exfoliation (LPE). Both bulk and 2D MnTe samples were an...

The use of green graphene (GG), as a green corrosion-resistant material for carbon steel, has recently gained much attention in the scientific community. We have prepared a green graphene/epoxy (GG/EP) based anticorrosive coating for the carbon steel. However, green graphene (GG) was synthesized from carbonaceous agricultural biomass. The corrosion...

The topologically engineered complex Schwarzites architecture has been used to build novel and unique structural components with a high specific strength. The mechanical properties of these building blocks can be further tuned, reinforcing with stronger and high surface area architecture. In the current work, we have built six different Schwarzites...

Since its isolation, single atomically thin layer of graphite, called graphene by Geim and co-workers, has received a lot of attention from the research community as well as industry. Interesting and ground-breaking research has been published on graphene showing excellent properties and a wide range of applications. Taking inspiration from graphen...

We carried out fully atomistic reactive molecular dynamics simulations to study the mechanical behavior of six newly proposed hybrid schwarzite-based structures (interlocked petal-schwarzites). Schwarzites are carbon crystalline nanostructures with negative Gaussian curvature created by mapping a TPMS (Triply Periodic Minimal Surface) with carbon r...

Two-dimensional (2D) materials with high surface activity can be utilized for harvesting energy from small mechanical sources using flexoelectricity. In the present work, we have synthesized an atomically thin 2D spinel MgCr2O4 by a liquid-phase exfoliation process, and characterization shows the preferential exfoliation along the (111) plane with...

Due to its abundant carbon content and renewable nature, agricultural biomass waste has emerged as a new source for making valuable products such as graphene or graphene analogs by using thermal processes (pyrolysis). This chapter summarizes and discusses research on the production of graphene or graphene analogs from agricultural waste and their u...

The efficient monitoring and early detection of viruses may provide essential information about diseases. In this work, we have highlighted the interaction between DNA and a two-dimensional (2D) metal oxide for developing biosensors for further detection of viral infections. Spectroscopic measurements have been used to probe the efficient interacti...

Graphene Extraction from Waste: A Sustainable Synthesis Approach for Graphene and its Derivatives introduces readers to strategies of graphene extraction from waste, an important advance in graphene material development to support the low-cost and large-scale production of this valuable material. The book compares the various green synthesis routes...

Ionic salts have received tremendous attention for applications such as electrolytes, solar energy, and desiccants. In particular, the high surface area of desiccant materials enhanced moisture absorption capacity, making it suitable for humidity control in various environments. However, lithium chloride (LiCl) salt properties remain largely unexpl...

Two-dimensional (2D) transition metal dichalcogenides (TMDCs) remain a topic of immense interest. Specifically, given their low operational switching costs, they find many niche applications in new computing architectures with the promise of continued miniaturization. However, challenges lie in Back End of Line (BEOL) integration temperature and ti...

The incessant accumulation of pharmaceutically active compounds (PhACs) in various environmental compartments represents a global menace. Herein, an equimolar high entropy alloy (HEA), i.e., FeCoNiCuZn, is synthesized via a facile and scalable method, and its effectiveness in eliminating four different PhACs from aqueous matrices is rigorously exam...

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,...

Unique interfacial properties of 2D materials make them more functional than their bulk counterparts in a catalytic application. In the present study, bulk and 2D graphitic carbon nitride nanosheet (bulk g-C3N4 and 2D-g-C3N4 NS) coated cotton fabrics and nickel foam electrode interfaces have been applied for solar light-driven self-cleaning of meth...

Carbon nanotubes have been explored in various fields of science and technology due to their unique properties. However, their toxic nature put limitations to its consideration for the bio-medical applications. In our work, we report the synthesis of paramagnetic CNT/Gd2O3 hybrid nanostructures through easily scalable electrochemical deposition tec...

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...

Direct ink writing (DIW) additive manufacturing is a versatile 3D printing technique for a broad range of materials. DIW can print a variety of materials provided that the ink is well-engineered with appropriate rheological properties. DIW could be an ideal technique in tissue engineering to repair and regenerate deformed or missing organs or tissu...

Unlabelled: For many biomedical applications, high-precision CO2 detection with a rapid response is essential. Due to the superior surface-active characteristics, 2D materials are particularly crucial for electrochemical sensors. The liquid phase exfoliation method of 2D Co2Te3 production is used to achieve the electrochemical sensing of CO2. The...

Developing materials for controlled hydrogen production through water splitting is one of the most promising ways to meet current energy demand. Here, we demonstrate spontaneous and green production of hydrogen at high evolution rate using gadolinium telluride (GdTe) under ambient conditions. The spent materials can be reused after melting, which r...

We report an eco-friendly, economical and green approach to synthesize few-layers of functionalised graphene from large graphite flakes and chunks without the aid of any external mechanical forces. Here, we demonstrate a fermentation process aided by friendly microbes like yeast to effortlessly exfoliate graphite to graphene with a high yield. The...

In a 3D printed polymer composite, the orientation of the reinforcement, distribution, and porosity plays a major role in its mechanical properties. Here, we demonstrate a precise control of the orientation of the reinforcement by varying different printing conditions such as nozzle diameter and flow rates. The experimental observation reveals a di...

Showcasing collaborative research from three countries: India (Indian Institute of Technology Kharagpur), Brazil (State University of Campinas), USA (Rice University and Yale University).

We report ultrafast studies on atomically-thin Gallium telluride, a newer 2D metal monochalcogenide that has appeared to display superior photo-detection properties in the visible frequencies. Pump photon energy-dependent spectroscopic studies reveal that photo-induced carriers in this direct bandgap material undergo indirect relaxation within $\si...

Atomically thin metallic alloy consisting of five elements can be utilized for hydrogen evolution and oxygen generation. The two‐dimensional multicomponent alloys are synthesized using their quasicrystal bulk form. More details can be found in article number 2200860, Douglas S. Galvao, Chandra S. Tiwary, Arup Dasgupta, Krishanu Biswas, and co‐worke...

In the last decade, the materials community has been exploring new 2D materials (graphene, metallene, TMDs, TMCs, MXene, among others) that have unique physical and chemical properties. Recent research has...

The incessant accumulation of pharmaceutically active compounds (PhACs) in various environmental compartments represents a global menace. Herein, an equimolar and environmentally benign FeCoNiCuZn HEA is synthesized via a facile and scalable method, and its effectiveness in eliminating four different PhACs from aqueous matrices is rigorously examin...

The presence of weak interlayer interactions and in‐plane covalent character in quasicrystals facilitate the synthesis of the two‐dimensional (2D) multicomponent alloy by chemical exfoliation. We report here, the first large‐scale formation of atomically thin 2D sheets by chemical exfoliation from the multicomponent Al70Co10Fe5Ni10Cu5 decagonal qua...

Energy Harvesters In article number 2200296, Chandra S. Tiwary and co-workers utilize a liquid phase exfoliation approach to make atomically thin gadolinium telluride (Gd2Te3), which is used to harvest energy from raindrops. Further, Gd2Te3 is used to decorate various 3D-printed structures and to produce energy from raindrops. A metropolis could be...

Transition-metal tellurides (TMTs) are promising materials for "post-graphene age" nanoelectronics and energy storage applications owing to their industry-standard compatibility, high electron mobility, large spin-orbit coupling (SOC), etc. However, tellurium (Te) having a larger ionic radius (Z = 52) and broader d-bands endows TMTs with semimetall...

The 3D printing (3DP) technology offers an innovative approach to developing energy storage devices to create facile and low‐cost customized electrodes for modern electronics. Generating electric potential by moving a droplet of ionic solution over 2D materials is a novel method for rain energy harvesting. This work demonstrates a liquid‐solid cont...

Additive manufacturing technologies are expected to disrupt the majority of the traditional way of manufacturing methods, particularly in the field of medical and healthcare. Bones and teeth are vital organs that are susceptible to various disorders due to environmental, traumatic, genetic factors, and inherent malignant disorders. Most of the impl...