Roberto González-Rodríguez

Precursor-dependent optical and structural properties of eleven NIR-emissive graphene quantum dots for bioimaging applications

Diya Vashani, Himish Paul, Steven Nguyen, Ugur Can Topkiran et autres

Abstract Graphene quantum dots (GQDs) have emerged as important bioimaging tools because of their biocompatibility and the ability of some to perform deep-penetration near-infrared (NIR) fluorescence imaging. The development of NIR-fluorescent GQDs from various precursors can enhance their use in multiplex imaging, …

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Fabrication of 1D-Confined MAPbI 3 in Cerium Oxide Nanotubes for Nanowire Solar Cells

Roberto González-Rodríguez, Evan Hathaway, Jeffery Coffer, Yuankun Lin et autres

CeO 2 is an n -type semiconductor and an excellent candidate as an electron transport layer for perovskite solar cells. However, it is challenging to fabricate high-quality CeO 2 nanotubes (NTs) to meet the specific applications. Here, we report an approach to …

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UV-Enabled Defect Engineering in Multilayer GaSe and InSe and UV Writing of the Grating Pattern

Bhojraj Bhandari, Sinto Varghese, Bimal Neupane, Sicheng Wang et autres

III–VI post-transition-metal chalcogenides are layered semiconductor materials that exhibit direct band gaps in multilayers. Defect engineering is essential in 2D layered semiconductors for functional devices. Here, we report defect engineering in multilayer gallium selenide (GaSe) and indium selenide (InSe), where defects generated …

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Various Metal Deposits within Nanostructured Silicon Investigated by FORC with Respect to Magnetic Interactions

Petra Granitzer, Klemens Rumpf, Roberto González-Rodríguez, Jeffery L. Coffer

Nanostructured silicon can be used as versatile host material for various magnetic materials, especially a quasi-regular arrangement of the pores / tubes leads to specific magnetic properties occurring from magnetic interactions between the metal-deposits. In the frame of this presentation magnetic interactions …

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Deposition of FePt-Nanoparticles within Porous Silicon and Silicon Nanotubes for Hard Magnetic Nanocomposites

Klemens Rumpf, Petra Granitzer, Roberto González-Rodríguez, Jeffery L. Coffer

In this work silicon nanotubes (SiNTs) and porous silicon (PSi), with embedded hard magnetic FePt nanoparticles (NPs) is used as platform to create nanomagnetic arrays. The magnetic response of FePt-loaded composite materials is investigated, which have potential in high-performance magnets and as …

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Sequential Infiltration Synthesis of Nematic Liquid Crystal Templated Reactive Mesogen Network

Tejal Pawale, Roberto González-Rodríguez, Hong Wang, Jingbiao Cui et autres

Sequential infiltration synthesis (SIS) is a promising technique for fabricating hybrid and inorganic structural thin films by leveraging soft material templates with versatile mesoscale structures. Liquid crystals (LCs), with their fast self-assembly kinetics, low energy input, wide range of morphologies from 1D …

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Wear- and Corrosion-Resistant Coatings for Extreme Environments: Advances, Challenges, and Future Perspectives

Subin Antony Jose, Zachary Lapierre, Tyler Williams, Colton N. Hope et autres

Tribological processes in extreme environments pose serious material challenges, requiring coatings that resist both wear and corrosion. This review summarizes recent advances in protective coatings engineered for extreme environments such as high temperatures, chemically aggressive media, and high-pressure and abrasive domains, as …

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Strain-Modulated Exciton Localization and Enhanced Emission in Multilayer GaSe

Sinto Varghese, Bimal Neupane, Bhojraj Bhandari, Sicheng Wang et autres

Strain engineering is one of the most effective routes for tuning the electrical and optical properties of two-dimensional layered materials. Besides reproducing the results of other groups on the tunability and photoluminescence (PL) enhancement of free and bound excitons under mechanical deformation …

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Plasma-enhanced thermal atomic layer deposition of nickel oxide and nickel carbide thin films

Holden Paulette, Evan Hathaway, Agra Wickramagedara, Roberto González-Rodríguez et autres

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Impact of Cetyl-Containing Ionic Liquids on Metal Halide Perovskite Structure and Photoluminescence

Maegyn A. Grubbs, Roberto González-Rodríguez, S. M. Dzyuba, Benjamin G. Janesko et autres

Ionic liquids (ILs) can ideally reduce defects and improve the film stability of emissive metal halide perovskite films. In this work, we measure how the structure and emission of methylammonium lead tribromide (MAPbBr3) perovskite films is modulated by long alkyl chain-containing pyridinium, …

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Halide perovskite-polymer composite film for bright and stable light-emitting devices

Maoding Cheng, Brooke Robinson, Manoj R. Shah, Emad Badradeen et autres

Stability is the primary hindrance for the application of halide perovskite material in light-emitting devices, solar cells, and other devices. In this work, halide perovskite and polymer composite film have been prepared for stable and bright light-emitting devices. Pure-phase Cs 4 PbBr …

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Quantum Emitters Induced by High Pressure and UV Laser Irradiation in Multilayer GaSe

Sinto Varghese, Sicheng Wang, Bimal Neupane, Bhojraj Bhandari et autres

In this work, we report on defect generation in multilayer GaSe through hydrostatic pressure quenching and UV laser irradiation. The Raman line width from the UV 266 nm irradiated sample is much wider than that in pressure-quenched GaSe, corresponding to a wider …

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