Carbon nanotubes (CNT) were used as a catalyst support where catalytically active Pd and Pt metalparticles decorated the outside of the external CNT walls. In this study, Pd and Pt nanoparticles supportedon HNO3-treated CNT were prepared by microwave-assisted heating of the polyol process using PdCl2 andH2PtCl6•6H2O precursors, respectively, and were then characterized by SEM, TEM, and Raman. Ramanspectroscopy showed that the acid treated CNT had a higher intensity ratio of ID/IG compared to that of non-treated CNT, indicating the formation of defects or functional groups on CNT after chemical oxidation.Microwave irradiation for total two minutes resulted in the formation of Pd and Pt nanoparticles on the acidtreated CNT. The sizes of Pd and Pt nanoparticles were found to be less than 10nm and 3nm, respectively.Furthermore, the SnO2 films doped with CNT decorated by Pd and Pt nanoparticles were prepared, and thenthe NO2 gas response of these sensor films was evaluated under 1~5ppm NO2 concentration at 200oC. It wasfound that the sensing property of the SnO2 film sensor on NO2 gas was greatly improved by the addition ofCNT-supported Pd and Pt nanoparticles.

This paper reports the results of an investigation into the effect of Cu additions upon the nano-crystallization behaviour of an Al-Y-Ni alloy. 1 at.% Cu was added to a base alloy of Al/sub 88/Y₄Ni/sub 8/ either by substitution for Al to form Al/sub 87/Y₄Ni/sub 8/Cu₁, or by substitution for Ni to form Al/sub 88/Y₄Ni/sub 7/Cu₁. Consistent with previous findings in the literature, the substitution of Cu for Al was found to increase the thermal stability of the amorphous phase whereas the substitution of Cu for Ni was found to decrease its thermal stability. Comparing the microstructures of these alloys after heat treatment to produce equivalent volume fractions of Al nanocrystals showed average grain sizes of 14 nm, 12 nm and 9 nm for the alloys Al/sub 88/Y₄Ni/sub 8/, Al/sub 87/Y₄Ni/sub 8/Cu₁respectively. The effect of Cu in refining the size of the nanocrystals was attributed to enhanced nucleation increasing the number density of the nanocrystals, rather than diffusion limited or interface limited growth.

Y2SiO5:Ce 형광체를 In2O3, Al2O3 및 SiO2로 코팅한 후 전계 방출 디스플레이에 요구되는 음극선 발광 특성을 조사하였다. Al2O3 코팅으로 Y2SiO(sub)5:Ce 형광체의 발광 효율과 에이징 특성은 감소되었다. 한편 Al2O3코팅으로 형광체의 발광효율은 증가하였으나 발광스펙트럼과 색좌표는 일부 변화하였다. 그러나 Y2SiO5:Ce 청색 형과체의 발광 효율은 SiO2코팅으로 크게 증가하였으며, 또한 SiO2 코팅한 Y2SiO5:Ce 형광체의 에이징 특성은 코팅 전에 비하여 크게 향상되었다.