10 results on '"Chandra Sekhar Tiwary"'
Search Results
2. Zirconia-Nanoparticle-Reinforced Morphology-Engineered Graphene-Based Foams
- Author
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Shrikant V. Joshi, Dibyendu Chakravarty, Leonardo D. Machado, Douglas S. Galvao, Ram Manohar Yadav, Chandra Sekhar Tiwary, G. Sundararajan, Soumya Vinod, Pulickel M. Ajayan, and Gustavo Brunetto
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Yield (engineering) ,Materials science ,Morphology (linguistics) ,Graphene ,Mechanical Engineering ,Nanoparticle ,Microstructure ,Nanocrystalline material ,law.invention ,Mechanics of Materials ,law ,General Materials Science ,Cubic zirconia ,Composite material - Abstract
The morphology of graphene-based foams can be engineered by reinforcing them with nanocrystalline zirconia, thus improving their oil-adsorption capacity; This can be observed experimentally and explained theoretically. Low zirconia fractions yield flaky microstructures where zirconia nanoparticles arrest propagating cracks. Higher zirconia concentrations possess a mesh-like interconnected structure where the degree of coiling is dependant on the local zirconia content.
- Published
- 2015
3. Chemical Vapor Deposition of Monolayer Rhenium Disulfide (ReS2)
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Chandra Sekhar Tiwary, Bo Li, Yongji Gong, Douglas S. Galvao, Antony George, Amelia H. C. Hart, Kunttal Keyshar, Robert Vajtai, Gustavo Brunetto, Gonglan Ye, Pulickel M. Ajayan, Yongmin He, Ken Hackenberg, Daniel P. Cole, Leonardo D. Machado, Mohamad Kabbani, and Wu Zhou
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Materials science ,business.industry ,Mechanical Engineering ,Transistor ,Inorganic chemistry ,technology, industry, and agriculture ,chemistry.chemical_element ,Chemical vapor deposition ,Rhenium ,equipment and supplies ,law.invention ,Characterization (materials science) ,Semiconductor ,chemistry ,Mechanics of Materials ,law ,Microscopy ,Monolayer ,General Materials Science ,Spectroscopy ,business - Abstract
The direct synthesis of monolayer and multilayer ReS2 by chemical vapor deposition at a low temperature of 450 °C is reported. Detailed characterization of this material is performed using various spectroscopy and microscopy methods. Furthermore initial field-effect transistor characteristics are evaluated, which highlight the potential in being used as an n-type semiconductor.
- Published
- 2015
4. 2D Materials: Quaternary 2D Transition Metal Dichalcogenides (TMDs) with Tunable Bandgap (Adv. Mater. 35/2017)
- Author
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Vidya Kochat, Boris I. Yakobson, Amey Apte, Alex Kutana, Jordan A. Hachtel, Sandhya Susarla, Chandra Sekhar Tiwary, Robert Vajtai, Pulickel M. Ajayan, and Juan Carlos Idrobo
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Materials science ,Band gap ,Mechanical Engineering ,Inorganic chemistry ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Transition metal ,Mechanics of Materials ,General Materials Science ,0210 nano-technology - Published
- 2017
5. Quaternary Alloys: Thermally Induced 2D Alloy-Heterostructure Transformation in Quaternary Alloys (Adv. Mater. 45/2018)
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Sandhya Susarla, Zehua Jin, Jordan A. Hachtel, Chandra Sekhar Tiwary, Robert Vajtai, Pulickel M. Ajayan, Juan Carlos Idrobo, Boris I. Yakobson, Alex Kutana, Jun Lou, Xiting Yang, and Amey Apte
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Materials science ,Condensed matter physics ,Phase stability ,Mechanical Engineering ,Alloy ,Heterojunction ,engineering.material ,Transformation (function) ,Mechanics of Materials ,Scanning transmission electron microscopy ,engineering ,General Materials Science ,Density functional theory ,Quaternary ,Phase diagram - Published
- 2018
6. An Insight into the Phase Transformation of WS 2 upon Fluorination
- Author
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Guillaume Colas, Sruthi Radhakrishnan, Abhishek K. Singh, Angel A. Martí, Parambath M. Sudeep, Sadegh Yazdi, Deya Das, Pulickel M. Ajayan, Tobin Filleter, Carlos A. de los Reyes, Liangzi Deng, Ching-Wu Chu, and Chandra Sekhar Tiwary
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Phase transition ,Materials science ,Band gap ,Mechanical Engineering ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Metal ,Transformation (function) ,Transition metal ,Mechanics of Materials ,Chemical physics ,visual_art ,Phase (matter) ,Microscopy ,visual_art.visual_art_medium ,Surface modification ,General Materials Science ,0210 nano-technology - Abstract
The transformation from semiconducting to metallic phase, accompanied by a structural transition in 2D transition metal dichalcogenides has attracted the attention of the researchers worldwide. The unconventional structural transformation of fluorinated WS2 (FWS2 ) into the 1T phase is described. The energy difference between the two phases debugs this transition, as fluorination enhances the stability of 1T FWS2 and makes it energetically favorable at higher F concentration. Investigation of the electronic and optical nature of FWS2 is supplemented by possible band structures and bandgap calculations. Magnetic centers in the 1T phase appear in FWS2 possibly due to the introduction of defect sites. A direct consequence of the phase transition and associated increase in interlayer spacing is a change in friction behavior. Friction force microscopy is used to determine this effect of functionalization accompanied phase transformation.
- Published
- 2018
7. Thermally Induced 2D Alloy‐Heterostructure Transformation in Quaternary Alloys
- Author
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Jordan A. Hachtel, Sandhya Susarla, Chandra Sekhar Tiwary, Alex Kutana, Robert Vajtai, Boris I. Yakobson, Amey Apte, Jun Lou, Xiting Yang, Pulickel M. Ajayan, Juan Carlos Idrobo, and Zehua Jin
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Materials science ,Photoluminescence ,Condensed matter physics ,Spinodal decomposition ,Band gap ,Mechanical Engineering ,Heterojunction ,02 engineering and technology ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Condensed Matter::Materials Science ,symbols.namesake ,Mechanics of Materials ,Phase (matter) ,Scanning transmission electron microscopy ,symbols ,General Materials Science ,0210 nano-technology ,Raman spectroscopy ,Phase diagram - Abstract
Composition and phase specific 2D transition metal dichalogenides (2D TMDs) with a controlled electronic and chemical structure are essential for future electronics. While alloying allows bandgap tunability, heterostructure formation creates atomically sharp electronic junctions. Herein, the formation of lateral heterostructures from quaternary 2D TMD alloys, by thermal annealing, is demonstrated. Phase separation is observed through photoluminescence and Raman spectroscopy, and the sharp interface of the lateral heterostructure is examined via scanning transmission electron microscopy. The composition-dependent transformation is caused by existence of miscibility gap in the quaternary alloys. The phase diagram displaying the miscibility gap is obtained from the reciprocal solution model based on density functional theory and verified experimentally. The experiments show direct evidence of composition-driven heterostructure formation in 2D atomic layer systems.
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- 2018
8. Multiscale Geometric Design Principles Applied to 3D Printed Schwarzites
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Peter Samora Owuor, Cristiano F. Woellner, Varlei Rodrigues, Robert Vajtai, Seyed Mohammad Sajadi, Douglas S. Galvao, Chandra Sekhar Tiwary, Steven Schara, Jun Lou, and Pulickel M. Ajayan
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Materials science ,Gaussian ,Mechanical engineering ,3D printing ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,law.invention ,symbols.namesake ,Molecular dynamics ,law ,General Materials Science ,Minimal surface ,Bearing (mechanical) ,business.industry ,Mechanical Engineering ,021001 nanoscience & nanotechnology ,Finite element method ,0104 chemical sciences ,Deformation mechanism ,Mechanics of Materials ,symbols ,0210 nano-technology ,business ,Gyroid - Abstract
Schwartzites are 3D porous solids with periodic minimal surfaces having negative Gaussian curvatures and can possess unusual mechanical and electronic properties. The mechanical behavior of primitive and gyroid schwartzite structures across different length scales is investigated after these geometries are 3D printed at centimeter length scales based on molecular models. Molecular dynamics and finite elements simulations are used to gain further understanding on responses of these complex solids under compressive loads and kinetic impact experiments. The results show that these structures hold great promise as high load bearing and impact-resistant materials due to a unique layered deformation mechanism that emerges in these architectures during loading. Easily scalable techniques such as 3D printing can be used for exploring mechanical behavior of various predicted complex geometrical shapes to build innovative engineered materials with tunable properties.
- Published
- 2017
9. Quaternary 2D Transition Metal Dichalcogenides (TMDs) with Tunable Bandgap
- Author
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Chandra Sekhar Tiwary, Sandhya Susarla, Robert Vajtai, Amey Apte, Pulickel M. Ajayan, Juan Carlos Idrobo, Boris I. Yakobson, Jordan A. Hachtel, Alex Kutana, and Vidya Kochat
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Imagination ,Range (particle radiation) ,Materials science ,Chemical substance ,Band gap ,business.industry ,Mechanical Engineering ,media_common.quotation_subject ,Doping ,Nanotechnology ,02 engineering and technology ,Chemical vapor deposition ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Transition metal ,Mechanics of Materials ,Optoelectronics ,General Materials Science ,0210 nano-technology ,business ,Science, technology and society ,media_common - Abstract
Alloying/doping in 2D material is important due to wide range bandgap tunability. Increasing the number of components would increase the degree of freedom which can provide more flexibility in tuning the bandgap and also reduces the growth temperature. Here, synthesis of quaternary alloys Mox W1-x S2y Se2(1-y) is reported using chemical vapor deposition. The composition of alloys is tuned by changing the growth temperatures. As a result, the bandgap can be tuned which varies from 1.61 to 1.85 eV. The detailed theoretical calculation supports the experimental observation and shows a possibility of wide tunability of bandgap.
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- 2017
10. Metal Immiscibility Route to Synthesis of Ultrathin Carbides, Borides, and Nitrides
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Xiang Zhang, Suman Sarkar, Vidya Kochat, Kamanio Chattopadhyay, Soham Chattopadhyay, Sanjay Kashyap, Zixing Wang, S. A. Syed Asif, Abhisek K. Singh, Chandra Sekhar Tiwary, Praveena Manimunda, Atanu Samanta, Prafull Pandey, and Pulickel M. Ajayan
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Materials science ,chemistry.chemical_element ,02 engineering and technology ,Chemical vapor deposition ,Nitride ,010402 general chemistry ,01 natural sciences ,Carbide ,Metal ,chemistry.chemical_compound ,Boride ,General Materials Science ,Ceramic ,Materials Research Centre ,Mechanical Engineering ,Metallurgy ,Materials Engineering (formerly Metallurgy) ,021001 nanoscience & nanotechnology ,Copper ,0104 chemical sciences ,chemistry ,Chemical engineering ,Mechanics of Materials ,visual_art ,visual_art.visual_art_medium ,0210 nano-technology ,Tantalum carbide - Abstract
Ultrathin ceramic coatings are of high interest as protective coatings from aviation to biomedical applications. Here, a generic approach of making scalable ultrathin transition metal-carbide/boride/nitride using immiscibility of two metals is demonstrated. Ultrathin tantalum carbide, nitride, and boride are grown using chemical vapor deposition by heating a tantalum-copper bilayer with corresponding precursor (C2 H2 , B powder, and NH3 ). The ultrathin crystals are found on the copper surface (opposite of the metal-metal junction). A detailed microscopy analysis followed by density functional theory based calculation demonstrates the migration mechanism, where Ta atoms prefer to stay in clusters in the Cu matrix. These ultrathin materials have good interface attachment with Cu, improving the scratch resistance and oxidation resistance of Cu. This metal-metal immiscibility system can be extended to other metals to synthesize metal carbide, boride, and nitride coatings.
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- 2017
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