G.S. Wu

Layer-by-Layer Assembled Conductive Metal-Organic Framework Nanofilms for Room-Temperature Chemiresistive Sensing

The utility of electronically conductive metal-organic frameworks (EC-MOFs) in high-performance devices has been limited to date by a lack of high-quality thin film. The controllable thin-film fabrication of an EC-MOF, Cu3 (HHTP)2 , (HHTP=2,3,6,7,10,11-hexahydroxytriphenylene), by a spray layer-by-layer liquid-phase epitaxial method is reported. The Cu3 (HHTP)2 thin film can not only be precisely prepared with thickness increment of about 2u2005nm per growing cycle, but also shows a smooth surface, good crystallinity, and high orientation. The chemiresistor gas sensor based on this high-quality thin film is one of the best room-temperature sensors for NH3 among all reported sensors based on various materials.

Synthesis, characterization and photoluminescence of aluminium nitride nanopowders through an AlCl3 aided CVD route .

Single-phase AlN nanopowders, with average diameter of about 70 nm, were synthesized through an AlCl3 aided CVD route; the formation process is also discussed in this paper. XRD and HRTEM revealed that the AlN nanopowders obtained are wurtzite structured with lattice constants of a = 3.1114 A and c = 4.9792 A. The photoluminescence spectrum showed that there is a deep-level blue luminescence band centred at 2.54 eV in AlN nanocrystals. This method is a simple and efficient way to synthesize AlN nanopowders.