Morphology Control and Functionalization of Nanoporous Metals

纳米多孔金属的形貌控制和功能化

基本信息

批准号：
17560582
负责人：
TANIMOTO Hisanori
金额：
$ 2.31万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17560582/
关键词：
nanoporous metal gas-deposition method selective etching internal surface surface and interface electric resistivity gas absorption nanofilter 金属物性格子欠陥

项目摘要

Nanoporous (np-) Au membranes with nm sized open channels were prepared by both the gas-deposition (GD) method and selective etching (SE) of Ag from a Au-Ag alloy. The gas permeability measurement and surface observations by using STM and SEM indicated that, the diameter and area density of the channel in GD np-Au were a few nm and about a few% and those of SE np-Au about 10〜60 nm and about 20%, respectively. The diameter and area density of the channels could be reduced by uniaxial compression of SE np-Au. The resistivity R of the SE np-Au membrane with the BET surface area of 6.4 m^2/g was as high as about 25 times higher than that of the bulk Au and that with 32 m^2/g about 400 times higher. Further, the resistivity showed an abrupt decrease by about 0.1% when the atmosphere around the membrane was started to expose to the air from vacuum. In contrast, the atmospheric change from vacuum to the air caused an abrupt increase of the resistivity by 0.1%. This resistivity change was much reduced when the SE np-Au was exposed to the dried air. These observations suggest that desorption and absorption of water molecules was detected as the increase and decrease in the resistivity, respectively.

具有NM大小开放通道的纳米多孔（NP-）AU机制是通过AU-AG合金的AG的气体沉积（GD）方法和AG的选择性蚀刻（SE）制备的。使用STM和SEM的气体通透性测量和表面观察表明，GD NP-AU中通道的直径和面积密度分别为几个nm，大约几个％，而SE NP-AU的直径和面积密度分别为10-60 nm和约20％。通过单轴压缩SENP-AU，可以降低通道的直径和面积密度。 SENP-AU膜的抗性R 6.4 m^2/g的BET表面积高约25倍，该膜高约25倍，该膜高约25倍，该膜高约25倍，该膜高约32 m^2/g大约高约400倍。此外，当膜周围的大气开始暴露于真空中的空气中时，抗性的突然降低了约0.1％。对比，从真空到空气的大气变化导致抗性突然增加0.1％。当SE NP-AU暴露于干燥的空气中时，这种抗性变化大大降低了。这些观察结果表明，分别检测到水分子的解吸和滥用分别是耐药性的增加和减少。