- 标题
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Pd/TiO <sub/>2</sub> -Photocatalyzed Self-Condensation of Primary Amines To Afford Secondary Amines at Ambient Temperature
摘要： Symmetric secondary amines were synthesized by the self-condensation of primary amines over a palladium-loaded titanium dioxide (Pd/TiO2) photocatalyst. The reactions a?orded a series of secondary amines in moderate to excellent isolated yields at ambient temperature (30 °C, in cyclopentyl methyl ether). Applicability for one-pot pharmaceutical synthesis was demonstrated by a photocatalytic reaction sequence of self-condensation of an amine followed by N-alkylation of the resulting secondary amine with an alcohol.
关键词： secondary amines,Pd/TiO2,self-condensation,primary amines,photocatalysis
更新于2025-09-23 15:21:21
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Germanium quantum dot infrared photodetectors addressed by self-aligned silicon nanowire electrodes
摘要： Germanium quantum dots (GeQDs), addressed by self-aligned and epitaxial silicon nanowires (SiNWs) as electrodes, represent the most fundamental and the smallest units that can be integrated into Si optoelectronics for 1550 nm wavelength detection. In this work, individual GeQD photodetectors have been fabricated based on a low temperature self-condensation of uniform amorphous Si (a-Si)/a-Ge bilayers at 300 oC, addressed by self-aligned silicon nanowire electrodes. The photodetectors demonstrate a responsivity of 1.5 mA/W and a photoconductive gain exceeding 102 to the communication wavelength signals, which are related to the beneficial type-II Ge/Si alignment, gradient Ge/Si epitaxial transition and a larger QD/NW diameter ratio. Importantly, this hetero GeQD/SiNW photodetectors can be deployed into predesigned locations for scalable device fabrication. These results indicate a new approach to batch-fabricate and integrate GeQDs for ultra-compact Si-compatible photodetection and imaging applications.
关键词： Ge quantum dots,self-condensation,photodetectors,Si nanowires
更新于2025-09-12 10:27:22