Nanjing Tech University

About: Nanjing Tech University is a education organization based out in Nanjing, China. It is known for research contribution in the topics: Catalysis & Membrane. The organization has 21827 authors who have published 21794 publications receiving 364050 citations. The organization is also known as: Nangongda & Nánjīng Gōngyè Dàxúe.

Fluorescent nanomaterial-derived white light-emitting diodes: what's going on

Abstract: White light-emitting diodes (white LEDs) have recently attracted substantial interest owing to their remarkable energy conservation. The evolution of fluorescent nanomaterials with tunable optical properties has provided an opportunity for light source design of white LEDs. However, the stability and performance of fluorescent nanomaterial-derived white LEDs still fail to meet the requirements of practical applications. It is therefore imperative to boost their overall device performance, which depends on not only the exploitation of advanced fluorescent nanomaterials but also the design of a superior light source. In this review, the achievements regarding fluorescent nanomaterials as color converters towards white LEDs are highlighted, including semiconductor nanocrystals or colloidal quantum dots (QDs), carbon-based nanoparticles, silicon QDs, and organic–inorganic fluorescent nanocomposites. The challenges and future perspectives in this research area are also discussed.

Synergism of C5N six-membered ring and vapor-liquid-solid growth of CNx nanotubes with pyridine precursor

Abstract: A series of bamboo-like CNx nanotubes have been synthesized from pyridine precursor by chemical vapor deposition with bimetallic Fe−Co/γ-Al2O3 catalyst in the range of 550∼950 °C. An unusual predomination of pyridinic nitrogen over graphitic nitrogen has been observed for the CNx nanotubes with reaction temperature below 750 °C. The pyridinic nitrogen decreases and the graphitic nitrogen increases with rising reaction temperature. A synergism mechanism of C5N-six-membered-ring-based growth through surface diffusion and vapor−liquid−solid growth through bulk diffusion was accordingly deduced and schematically presented. This mechanism could not only explain our own experimental results, but also understand the CNx-nanotube-related experimental phenomena in the literature, as well as be in accordance with the basic principle of diffusion kinetics. A promising route to the challenging topic for synthesizing regularly arranged C5N or high-N-content CNx nanotubes has also been suggested.