Fabrication of metal-shelled coaxial nanowires and annealing-induced formation of metal nanoparticles for catalytic applications: Growth and characteristics of SnO2-branched nanostructures

被引：10

作者：

Kim, Hyo Sung ^{[1
]}

Park, Sang Eon ^{[2
]}

Kim, Hyoun Woo ^{[1
]}

Park, Jae Young ^{[1
]}

Jiang, Nanzhe ^{[2
]}

Kim, Sang Sub ^{[1
]}

机构：

[1] Inha Univ, Div Engn & Mat Sci, Inchon, South Korea

[2] Inha Univ, Dept Chem, Inchon, South Korea

来源：

SOLID STATE SCIENCES | 2010年 / 12卷 / 06期

关键词：

Branched structures; Nanomaterials; Photoluminescence; Gas sensing properties; SILVER NANOPARTICLES; OPTICAL-PROPERTIES; HIERARCHICAL NANOSTRUCTURES; GAS SENSOR; SILICON; TRANSISTORS; MECHANISM; BRANCH;

D O I：

10.1016/j.solidstatesciences.2009.04.033

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

We have fabricated SnO2 branches on SiOx stem nanowires, via a novel multi-step process. With the SnO2 branches having diameters in the range 20-80 nm, X-ray diffraction, transmission electron microscopy and selected area diffraction pattern coincidentally revealed that the branches were crystalline rutile SnO2 structures. We suggested that a Ag-catalyzed base-growth vapor-liquid-solid growth mechanism was responsible for the growth of SnO2 branches. Photoluminescence analysis indicated that the Ag-coated SiOx nanowires exhibited emission bands centered at 2.6 eV and 3.1 eV, presumably from the SiOx core nanowires. Subsequent annealing induced 2.4-eV band, whereas the growth of SnO2 branches induced 2.1-eV band. For the branched product, we have investigated the O-2 and NO2 sensing properties. A linear relationship between sensitivity and the O-2 gas concentration was observed, which demonstrates its potential application to chemical sensors.

引用

页码：970 / 977

页数：8