The gold ticket to achiral WS2 nanotubes

Article Chemistry, Physical

Direct growth of single-chiral-angle tungsten disulfide nanotubes using gold nanoparticle catalysts

Qinwei An et al.

Summary: We have successfully grown high-quality WS2 and WSe2 nanotubes on Si substrates using catalytic chemical vapour deposition with Au nanoparticles. The Au nanoparticles act as nucleation sites for the growth of WS2 or WSe2 shells, which subsequently seed the growth of nanotubes. We find that the growth mode of nanotubes is sensitive to temperature and have achieved around 79% WS2 nanotubes with single chiral angles, primarily at 30 degrees (approximately 37%) and 0 degrees (approximately 12%). Furthermore, we demonstrate the tunability of geometric, electronic, and optical properties of WS2 nanotubes through their chirality.

NATURE MATERIALS (2023)

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Article Multidisciplinary Sciences

Mesoscopic sliding ferroelectricity enabled photovoltaic random access memory for material-level artificial vision system

Yan Sun et al.

Summary: This study presents a nano-electro-mechanical-opto system embedded in multiwall tungsten disulfide nanotubes, which exhibits a unique form of in-plane van der Waals sliding ferroelectricity due to the combination of superlubricity and piezoelectricity. The multiwall tungsten disulfide nanotubes can be used as photovoltaic random-access memory, enabling programmable photovoltaic effect. Additionally, a complete artificial vision system that performs detection, processing, memorizing, and powering functions is integrated into the nanotube devices, allowing for self-driven image recognition.

NATURE COMMUNICATIONS (2022)

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Article Multidisciplinary Sciences