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Updated: Sep 9, 2025

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
Published on: December 5, 2015
Highly selective aldehyde coupling on the heterointerface of molybdenum selenide and graphdiyne
Siao Chen1,2, Yurui Xue1,3, Yang Gao1
1Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
Abstract:
The highly negative reduction potential prevents the selective coupling of two aldehydes to construct C─C bonds and hinders the formation of ketyl radicals. However, this important comprehensive issue remains unsolved. Here, we report the efficient activation of aldehydes by the in situ growth of a molybdenum selenide-graphdiyne heterointerface structure, allowing an aldehyde molecule to be selectively coupled with another aldehyde at room temperature and ambient pressure. High-resolution transmission electron microscopy and scanning transmission electron microscopy (HAADF-STEM) images reveal the formation of high-density active sites at the interface structure. The synchrotron x-ray photoelectron spectroscopy, x-ray absorption spectroscopy, and electron paramagnetic resonance spectroscopy results confirmed the selective formation of ketyl radicals. The noninteger charge transfer between graphdiyne and metal atoms promotes the continuous selectivity and efficient activation of aldehydes and C─C coupling of ketyl radicals. The ultrahigh selectivity of 2-furaldehyde for hydrofurion reached 92 ± 2%, while the turnover frequency reached 57 ± 4 per second.
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