Ummiya Qamar

Alloy-nanocrystal-induced plasmonic field enhancement and phase transition in 2D-MoS2 for efficient multi-analyte sensing

Ummiya Qamar, Anupam Halder, Aman Kumar Lal Das, Satarupa Dutta et autres

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Conductance quantization and quantum-point-contact formation in hBN/HfO 2 bilayer memristive devices

Tanmayee Parida, Arpan Bhattacharyya, Ummiya Qamar, Santanu Das et autres

Abstract We report quantized conductance and quantum point contact (QPC) formation in memristive devices comprising exfoliated hexagonal boron nitride (hBN) over HfO 2 as the active layer. The scattered hBN flakes locally enhance oxygen vacancy concentration, forming the filamentary paths beneath Ag …

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Seamless 2D-MoS2/3D-Si heterojunctions for white light detection applications

Santanu Das, Jogendra Singh Rana, Ummiya Qamar, Satyabrata Jit

Abstract In this study, we investigate the quality of junction formation and its impact on the electronic and optoelectronic properties of two-dimensional (2D) multilayered molybdenum disulfide (MoS2) films directly grown on three-dimensional (3D) p-type silicon (p-Si) (110) substrates. Large-area (15 mm × …

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Exploring Oxygen Vacancies in Sputtered HfO 2 Films for Multi‐Bit RRAM Applications

Tanmayee Parida, Sonali Patajoshi, Bisweswar Santra, Ummiya Qamar et autres

Abstract Compute‐in‐memory architectures demand resistive random‐access memory (RRAM) devices with atomic‐level control over conductance states. Here, a dopant‐free HfO 2 RRAM platform is demonstrated by changing stoichiometry across the film by radio‐frequency magnetron sputtering. The secondary ion mass spectrometry reveals a gradual …

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Hot Electron-Mediated Ultrasensitive Sensing in Plasmonic Ag/2D-MoS2 Nanostructures

Ummiya Qamar, Santanu Das

Surface-enhanced Raman scattering (SERS) stands out as a powerful analytical technique, offering exceptional capabilities in molecular detection and characterization distinguished by its extraordinary sensitivity, high selectivity, and versatility. In this study, we present the synthesis of silver nanostructures, primarily triangular silver nanostructure …

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Plasmonic polyhedral silver nanocrystal decorated 2D-MoS2 as efficient SERS substrate for analyte detection

Ummiya Qamar, Nikhil Kumar, Suman Chowdhury, Santanu Das

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Polygonal Silver Nanocrystal Decorated 2d-Mos2 as Efficient Substrates for Analyte Detection

Ummiya Qamar, Nikhil Kumar, Suman Chowdhury, Santanu Das

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Plasmonic Polyhedral Silver Nanocrystal Decorated 2d-Mos2 as Efficient Sers Substrate for Analyte Detection

Ummiya Qamar, Nikhil Kumar, Suman Chowdhury, Santanu Das

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A bifunctional electrocatalyst for total water splitting using MoNi4/MoO2 nanorods supported by reduced graphene oxide

Vivek K. Singh, Ummiya Qamar, Srijith Srijith, Debabrata Mandal et autres

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Ordered Au3Cu Nanocrystals Induced Phase Transformation in 2D-MoS2 as SERS Substrate for Enhancing Molecular Detection

Ummiya Qamar, Bratindranath Mukherjee, Assa Aravindh Sasikala Devi, Santanu Das

Surface-enhanced Raman scattering (SERS) is one of the potent methods that provides remarkable sensitivity, selectivity, and adaptability for molecular analysis at an ultralow concentration level. Here, we report the synthesis of plasmonic ordered gold–copper alloy (Au 3 Cu) nanocrystals (NCs) with size …

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Recent progresses on Janus electrocatalysts for water electrolysis: A critical review

S. Roy, Ummiya Qamar, Assa Aravindh Sasikala Devi, Santanu Das

Newly emerged Janus materials showed the vast potential for catalysis and photocatalysis owing to their multifunctional properties, attracting attention as next-generation functional materials. This Review focuses on various synthesis processes for developing a novel class of Janus materials for applications in electrocatalysis …

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Plasmonic Au3Cu Ordered Nanocrystals Induced Phase Transformation in 2D‐MoS2 for Efficient Hydrogen Evolution

Ummiya Qamar, Sayak Roy, Sooraj Kumar, Bratindranath Mukherjee et autres

Abstract The synthesis of ordered gold‐copper (Au3Cu) alloy nanocrystals (≈10 nm) is reported and used in the semiconductor (2H) to metallic (1T) phase transformation of an atomically thin large‐area 2D‐MoS2 grown via CVD technique. The ordered Au3Cu nanocrystals are dispersed over 2D‐MoS2, …

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