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Chirality control for predominant metallic or semiconducting single-walled carbon nanotubes prepared using a mild etchant
摘要： Highly oriented metallic and semiconducting SWCNTs were synthesized with different carrier gas compositions and etchants by the floating catalyst chemical vapor deposition method. The addition of acetone as an etchant resulted in metallic nanotubes. The acetone acted as both an additional carbon source and etching agent for carbon nanotube nucleation.
关键词： Chirality control,Metallic,Floating catalyst chemical vapor deposition,Single-walled carbon nanotubes,Acetone,Semiconducting,Etchant
更新于2025-09-16 10:30:52
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Centimeter-Scale Nanoporous 2D Membranes and Ion Transport: Porous MoS2 Monolayers in a Few-Layer Matrix
摘要： Two-dimensional nanoporous membranes have received attention as catalysts for energy generation and membranes for liquid and gas purification but controlling their porosity and facilitating large-scale production is challenging. We show the growth and fabrication of cm-scale molybdenum disulfide (MoS2) membranes with tunable porous areas up to ~ 10% of the membrane and average nanopore diameters as large as ~ 30 nm, controlled by the etch time. We also measure ionic conductance between 0.1 and 16 μS per μm2 through variably-etched nanoporous membranes. Ensuring the mechanical robustness and large-area of the membrane, bilayer and few-layer regions form a strong supporting matrix around monolayer regions, observed by aberration-corrected scanning transmission electron microscopy. During etching, nanopores form in thin, primarily monolayer areas while thicker multi-layer regions remain essentially intact. Atomic-resolution imaging reveals that after exposure to the etchant, the number of V1Mo vacancies increases and nanopores form along grain boundaries in monolayers, suggesting that etching starts at intrinsic defect sites. This work provides an avenue for scalable production of nanoporous atomically thin membranes.
关键词： Transition metal dichalcogenides,molybdenum disulfide,nanoporous atomically thin membranes,defects,PAN etchant,nanopore
更新于2025-09-04 15:30:14