ORCID Profile
0000-0002-4518-9420
Current Organisation
SRM University
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Publisher: Wiley
Date: 05-08-2022
Abstract: Self‐powered, wide‐spectral response, fast, and high‐sensitivity photodetectors are essential for developing next‐generation optoelectronic devices. In this work, the predicted optoelectronic properties of the ternary metal‐zinc (Zn)‐nitride (N) thin films are experimentally demonstrated. A novel phase of the Titanium (Ti)‐Zn‐N system (dominantly TiZnN 2 film of ≈235 nm thickness) is developed on the p‐Si substrate, which shows excellent optoelectronic properties. The Indium Tin Oxide (ITO)/TiZnN 2 ‐type Si (p‐Si) photodetector of area ≈4 mm 2 exhibits an impressive responsivity of 1.22 × 10 –4 A W −1 at 0 V and 40 mA W −1 at −4 V, a specific detectivity up to 1.16 × 10 9 Jones at 0 V, and a response speed of 1.9 ms at zero external bias (i.e., self‐powered mode). Benefiting from the broad‐band absorption of the film and p‐Si combination, the detection range is observed from the ultraviolet to near‐infrared (300–1150 nm). Simultaneous operation of self‐powered photo‐triggered drip irrigation ON and street light OFF in the early morning and vice‐versa in the evening is demonstrated for autonomous farming. The device is insensitive to humidity and ambiance, and generates a photocurrent with light intensity as low as 5 mW cm −2 . The active layer is hydrophobic and highly stable, and the fabrication is cost‐effective.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0CE01723J
Abstract: Two epimeric series of esters exhibit distinct mechanical behaviour: brittle crystals for one series and ductile crystals for the other series.
Publisher: Wiley
Date: 07-01-2019
Publisher: Elsevier BV
Date: 07-2020
Publisher: Wiley
Date: 11-12-2018
Abstract: Comprehension of the nanomechanical response of crystalline materials requires the understanding of the elastic and plastic deformation mechanisms in terms of the underlying crystal structures. Nanoindentation data were combined with structural and computational inputs to derive a molecular-level understanding of the nanomechanical response in eight prototypical sulfa drug molecular crystals. The magnitude of the modulus, E, was strongly connected to the non-covalent bond features, that is, the bond strength, the relative orientation with the measured crystal facet and their disposition in the crystal lattice. Additional features derived from the current study are the following. Firstly, robust synthons well isolated by weak and dispersive interactions reduce the material stiffness in contrast, the interweaving of interactions with erse energetics fortifies the crystal packing. Secondly, mere observation of layered structures with orthogonal distribution of strong and weak interactions is a prerequisite, but inadequate, to attain higher plasticity. Thirdly, interlocked molecular arrangements prevent long-range sliding of molecular planes and, hence, lead to enhanced E values. In a broader perspective, the observations are remarkable in deriving a molecular basis of the mechanical properties of crystalline solids, which can be exploited through crystal engineering for the purposeful design of materials with specific properties.
Publisher: American Chemical Society (ACS)
Date: 10-03-2023
Publisher: AIP Publishing
Date: 26-09-2022
DOI: 10.1063/5.0099161
Abstract: Piezoelectric materials (PEMs) find a wide spectrum of applications that include, but are not limited to, sensors, actuators, semiconductors, memory devices, and energy harvesting systems due to their outstanding electromechanical and polarization characteristics. Notably, these PEMs can be employed across several length scales (both intrinsic and extrinsic) ranging from mesoscale (bulk ceramics) to nanoscale (thin films) during their applications. Over the years, progress in probing in idual electrical and mechanical properties of PEM has been notable. However, proportional review articles providing the mechanical characterization of PEM are relatively few. The present article aims to give a tutorial on the mechanical testing of PEMs, ranging from the conventional bulk deformation experiments to the most recent small-scale testing techniques from a materials science perspective. The advent of nanotechnology has led materials scientists to develop in situ testing techniques to probe the real-time electromechanical behavior of PEMs. Therefore, this article presents a systematic outlook on ex situ and in situ deformation experiments in mechanical and electromechanical environments, related mechanical behavior, and ferroelectric/elastic distortion during deformation. The first part provides significant insights into the multifunctionality of PEM and various contributing microstructural length scales, followed by a motivation to characterize the mechanical properties from the application's point of view. In the midst, the mechanical behavior of PEM and related mechanical characterization techniques (from mesoscale to nanoscale) are highlighted. The last part summarizes current challenges, future perspectives, and important observations.
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2TC00076H
Abstract: Reversible responses as a result of thermal and mechanical stimuli are investigated for an organic salt polymorph. The dissipation of strain occurs by conformational and rotational changes in molecule leading to exhibition of shape memory effect.
Publisher: Wiley
Date: 07-2021
Abstract: Electronic materials such as semiconductors, piezo‐ and ferroelectrics, and metal oxides are primary constituents in sensing, actuation, nanoelectronics, memory, and energy systems. Although significant progress is evident in understanding the mechanical and electrical properties independently using conventional techniques, simultaneous and quantitative electromechanical characterization at the nanoscale using in situ techniques is scarce. It is essential because coupling/linking electrical signal to the nanoscale plasticity provides vital information regarding the real‐time electromechanical behavior of materials, which is crucial for developing miniaturized smarter technologies. With the advent of conductive nanoindentation, researchers have been able to get valuable insights into the nanoscale plasticity (otherwise not possible by conventional means) in a wide variety of bulk and small‐volume materials, quantify the electromechanical properties, understand the dielectric breakdown phenomenon and the nature of electrical contacts in thin films, etc., by continuously monitoring the real‐time electrical signal changes during any point on the indentation load–hold–unload cycle. This comprehensive Review covers probing the electromechanical behavior of materials using in situ conductive nanoindentation, data analysis methods, the validity of the models and limitations, and electronic conduction mechanisms at the nanocontacts, quantification of resistive components, applications, progress, and existing issues, and provides a futuristic outlook.
Publisher: American Chemical Society (ACS)
Date: 03-03-2022
Publisher: AIP Publishing
Date: 28-02-2015
DOI: 10.1063/1.4921534
Abstract: This study uses high-temperature nanoindentation coupled with in situ electrical measurements to investigate the temperature dependence (25–200 °C) of the phase transformation behavior of diamond cubic (dc) silicon at the nanoscale. Along with in situ indentation and electrical data, ex situ characterizations, such as Raman and cross-sectional transmission electron microscopy, have been used to reveal the indentation-induced deformation mechanisms. We find that phase transformation and defect propagation within the crystal lattice are not mutually exclusive deformation processes at elevated temperature. Both can occur at temperatures up to 150 °C but to different extents, depending on the temperature and loading conditions. For nanoindentation, we observe that phase transformation is dominant below 100 °C but that deformation by twinning along {111} planes dominates at 150 °C and 200 °C. This work, therefore, provides clear insight into the temperature dependent deformation mechanisms in dc-Si at the nanoscale and helps to clarify previous inconsistencies in the literature.
Publisher: AIP Publishing
Date: 08-12-2022
DOI: 10.1063/5.0135275
Publisher: Wiley
Date: 21-09-2023
Publisher: American Chemical Society (ACS)
Date: 12-08-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9CE01659G
Abstract: Crystalline forms of 5-fluoroisatin have been characterized by thermal, structural, and mechanical methods. The hardness and elastic modulus of the DMSO solvate is significantly higher than those of the picolinic acid co-crystal of 5-fluoroisatin.
No related grants have been discovered for Mangalampalli SRN Kiran.