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Day 2 : Jun 02,2026
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Abstract:

Dirac materials are characterized by the emergence of massless quasiparticles in their low-energy excitation spectrum governed by the Dirac Hamiltonian, resulting in linear band dispersion and unusual quantum transport properties. Systems such as graphene, topological insulators, d-wave superconductors, and Weyl and Dirac semimetals have demonstrated the rich physics associated with Dirac fermions. However, none of the Dirac materials identified so far combines Dirac-like electronic behavior with intrinsic metallic character in a purely elemental two-dimensional form.
In this work, we present experimental evidence for the formation of free-standing molybdenene, a two-dimensional material composed exclusively of molybdenum atoms. Using MoS? as a precursor, we induced electric-field-assisted growth under microwave irradiation to engineer the phase transformation and atomic rearrangement required for molybdenene formation. The synthesis results in millimetre-long whiskers grown via a screw-dislocation-driven mechanism. These whiskers consist of weakly bonded layered sheets that can be mechanically exfoliated to obtain ultrathin molybdenene flakes. Electrical characterization reveals clear metallic behavior, with an electrical conductivity of approximately 940 S m?¹ indicating efficient charge transport in the exfoliated layers. The combination of metallic conductivity and two-dimensional morphology distinguishes molybdenene from previously reported Dirac systems and positions it as a promising platform for both fundamental studies and technological applications.
As a proof of principle, we further demonstrate the multifunctionality of molybdenene. The material acts as an effective surface-enhanced Raman spectroscopy (SERS) substrate for molecular sensing, provides a conductive platform suitable for high-resolution electron imaging, and functions as an active material for scanning probe microscope cantilevers.
These findings introduce molybdenene as a new class of metallic two-dimensional Dirac material and open opportunities for its integration into nanoelectronic, sensing, and advanced microscopy technologies.

Biography:

Dr. Tumesh Kumar Sahu is an Assistant Professor at the University Institute of Technology (UIT), Gadchiroli, India. He holds a Ph.D. in Physics with a specialization in graphene and other two-dimensional materials. His academic and research work focuses on advanced nanomaterials, Dirac materials, and functional two-dimensional systems for nanoelectronic and sensing applications.He is also associated with 9N Technology, London, UK, a startup company, where he serves as Lead Scientist working on graphene-based memory devices. Prior to joining academia, he worked as Product and R&D Manager at Multi Nanosense Technology Pvt. Ltd., India. He also served as an R&D Scientist in Turkey for two years, contributing to the design and development of advanced Atomic Force Microscopy systems.
Dr. Sahu’s research interests include graphene-based devices, hydrogen sensors, greenhouse gas sensors, and device architectures such as FETs and diode-based applications, with a strong emphasis on translating fundamental materials research into scalable and practical technologies.
Biography:
Sahrish Naheed, a master’s student in the School of Materials Science and Engineering at Wuhan University of Technology, China. I completed my Bachelor of Science in Chemistry in Pakistan in 2023 with a CGPA of 3.62. My current research focuses on MOFs, COFs, and POPs for energy applications. I will be presenting virtually at the 9th Edition of the Nanotechnology, Nanomedicine, Material Science & Expo Hybrid Conference, to be held in Bali, Indonesia, and Valencia, Spain.

Abstract:
Due to the intermittent nature of renewable energy sources (solar, wind), there is a need to develop efficient, scalable, and sustainable energy storage systems. Existing energy storage technologies face fundamental challenges, and this study aimed to tackle those challenges by exploring new synthetic routes for novel materials. It focused on enhancing the performance, scalability, and environmental sustainability of energy storage technologies, including lithium-ion batteries, supercapacitors, and hydrogen storage systems. Designing metal-organic frameworks (MOFs), perovskites, and polymer electrolytes via green chemistry principles to minimize the environmental impact of produced materials. The cyclic voltammetric, electrochemical impedance spectroscopic, and long-term cycle stability measurements of electrochemical performance were conducted. Density Functional Theory (DFT) simulations for computational modelling were used to predict material properties and optimize reaction pathways. In these results, MOF-based lithium-ion batteries achieved the best energy density (310 Wh/kg); polymer-based supercapacitors exhibited high power density (2000 W/kg) and cycling stability (94% retention after 1000 cycles). Recently the stability of perovskite-based hydrogen storage systems was improved to 88% of the capacity after 1000 cycles. The results confirmed that using high-performance materials from 21st-century fibers with sustainable synthesis approaches solved key performance and sustainability challenges. It lays a foundation towards stackable and sustainable energy storage systems, which can be used in technological energy grids, electric vehicles, and portable devices.
Abstract:
Atomically precise gold nanoclusters (AuNCs) have emerged as a promising class of nanomaterials bridging the gap between small molecules and nanoparticles, offering unique electronic structures and tunable photophysical properties. Among these, near-infrared (NIR I/II) emitting AuNCs are particularly attractive for biomedical applications due to their ability to enable deep tissue imaging with minimal autofluorescence. However, a fundamental challenge remains in achieving bright, stable NIR emission while maintaining biocompatibility and therapeutic functionality. Here, we present a ligand-centric strategy to engineer NIR-emitting AuNCs by precisely tailoring fluorinated polymeric and small-molecule ligands. Our study demonstrates that ligand chemistry plays a decisive role in governing photoluminescence by modulating ligand-to-metal charge transfer (LMCT) and surface electronic states. Incorporation of fluorinated moieties suppresses non-radiative decay pathways and enhances electronic coupling at the ligand core interface, resulting in significantly improved NIR emission within the biological optical window. This a preserve sub-2 nm cluster size, enabling efficient renal clearance and systemic safety. Beyond optical tuning, the engineered AuNCs function as multifunctional theranostic agents. The fluorinated ligand shell not only stabilizes emission but also contributes to intrinsic pro-apoptotic activity, while further biofunctionalization enables targeted drug delivery. In vitro and in vivo studies in breast cancer models demonstrate efficient tumor accumulation, real-time NIR imaging, and significant tumor suppression with minimal off-target toxicity. This work highlights a broader paradigm in nanomedicine, that surface chemistry dictates function, not just core size. By establishing ligand engineering as a unifying design principle, this study advances AuNCs toward clinically translatable platforms capable of simultaneous imaging, therapy, and disease monitoring, paving the way for next-generation precision oncology.