ORCID Profile
0000-0002-1588-5994
Current Organisations
Australian National University
,
Jahangirnagar University
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Publisher: American Scientific Publishers
Date: 09-2013
Publisher: Wiley
Date: 15-09-2023
Publisher: Chemical Science Transactions
Date: 21-12-2020
DOI: 10.7598/CST2020.1720
Publisher: American Chemical Society (ACS)
Date: 14-06-2022
Abstract: Temperature mapping by in situ thermoreflectance thermal imaging (TRTI) or midwave infrared spectroscopy has played an important role in understanding the origins of threshold switching and the effect of insulator-metal transitions in oxide-based memrsitive devices. In this study, we use scanning thermal microscopy (SThM) as an alternative thermal mapping technique that offers high spatial resolution imaging (∼100 nm) and is independent of material. Specifically, SThM is used to map the temperature distribution in NbO
Publisher: Springer Science and Business Media LLC
Date: 20-11-2020
Publisher: AOA Academic Open Access Ltd.
Date: 09-2013
DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.17.59
Abstract: Homogeneous Polyvinyl alcohol (PVA)/Carbon nanotube (CNT) composite has been prepared by solution casting method using gum acacia as a surfactant. CNT content in the composite was varied from 5-10% by weight. The thermal properties of PVA/CNT composites were investigated by Thermo Gravimetric/Differential Thermal Analyzer (TG/DTA) and Thermo Mechanical Analyzer (TMA). TG/DTA results showed that higher thermal stability in higher percentage of CNT in the composites. The 10% CNT containing PVA composite exhibit highest onset of melting, glass transition point and offset of melting temperature and the recoded values are 330.4K, 379K and 421.3K respectively. All of the result indicates that the developed PVA/CNT composite might be promising for use in solar cell application
Publisher: Springer Science and Business Media LLC
Date: 07-11-2019
Publisher: American Scientific Publishers
Date: 09-2014
DOI: 10.1166/SL.2014.3297
Publisher: Elsevier BV
Date: 08-2020
Publisher: AIP Publishing
Date: 23-12-2020
DOI: 10.1063/5.0027875
Abstract: Metal–oxide–metal devices based on amorphous VOx are shown to exhibit one of two distinct negative differential resistance (NDR) characteristics depending on the maximum current employed for electroforming. For low compliance currents they exhibit a smooth S-type characteristic and have a temperature-dependent device resistance characterized by an activation energy of 0.25 eV, consistent with conduction in polycrystalline VO2, while for high compliance currents they exhibit an abrupt snap-back characteristic and a resistance characterized by an activation energy of 0.025 eV, consistent with conduction in oxygen deficient VOx. In both cases, the temperature dependence of the switching voltage implies that the conductivity change is due to the insulator–metal transition in VO2. From this analysis, it is concluded that electroforming at low currents creates a conductive filament comprised largely of polycrystalline VO2, while electroforming at high currents creates a composite structure comprised of VO2 and a conductive halo of oxygen deficient VOx. The effect of electroforming on the NDR mode is then explained with reference to a lumped element model of filamentary conduction that includes the effect of a parallel resistance created by the halo. These results provide new insight into the NDR response of vanadium-oxide-based devices and a basis for designing devices with specific characteristics.
Publisher: Wiley
Date: 30-12-2022
Abstract: Oxides that exhibit an insulator–metal transition can be used to fabricate energy‐efficient relaxation oscillators for use in hardware‐based neural networks but there are very few oxides with transition temperatures above room temperature. Here the structural, electrical, and thermal properties of V 3 O 5 thin films and their application as the functional oxide in metal/oxide/metal relaxation oscillators are reported. The V 3 O 5 devices show electroforming‐free volatile threshold switching and negative differential resistance (NDR) with stable ( % variation) cycle‐to‐cycle operation. The physical mechanisms underpinning these characteristics are investigated using a combination of electrical measurements, in situ thermal imaging, and device modeling. This shows that conduction is confined to a narrow filamentary path due to self‐confinement of the current distribution and that the NDR response is initiated at temperatures well below the insulator–metal transition temperature where it is dominated by the temperature‐dependent conductivity of the insulating phase. Finally, the dynamics of in idual and coupled V 3 O 5 ‐based relaxation oscillators is reported, showing that capacitively coupled devices exhibit rich non‐linear dynamics, including frequency and phase synchronization. These results establish V 3 O 5 as a new functional material for volatile threshold switching and advance the development of robust solid‐state neurons for neuromorphic computing.
Publisher: National Academy of Sciences of Ukraine (Co. LTD Ukrinformnauka) (Publications)
Date: 03-2021
Publisher: David Publishing Company
Date: 28-06-2020
Publisher: American Chemical Society (ACS)
Date: 29-04-2022
Abstract: Metal-oxide-metal (MOM) devices based on niobium oxide exhibit threshold switching (or current-controlled negative differential resistance) due to thermally induced conductivity changes produced by Joule heating. A detailed understanding of the device characteristics therefore relies on an understanding of the thermal properties of the niobium oxide film and the MOM device structure. In this study, we use time-domain thermoreflectance to determine the thermal conductivity of amorphous NbO
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3NR00173C
Abstract: The thickness and thermal conductivity of electrodes are shown to have a direct impact on the volatile threshold switching characteristics of NbO x -based memristors due to their effect on the temperature of the active volume.
Publisher: Springer Science and Business Media LLC
Date: 27-10-2017
Publisher: EDP Sciences
Date: 02-2014
No related grants have been discovered for Sujan Kumar Das.