Local Structural Disorder and Relaxation in SnO2 Nanostructures Studied by 119Sn MAS NMR and 119Sn Mossbauer Spectroscopy

被引：43

作者：

Indris, Sylvio ^{[1
]}

Scheuermann, Marco ^{[1
]}

Becker, Sebastian M. ^{[1
,2
]}

Sepelak, Vladimir ^{[1
]}

Kruk, Robert ^{[1
]}

Suffner, Jens ^{[1
,3
]}

Gyger, Fabian ^{[2
,4
]}

Feldmann, Claus ^{[2
,4
]}

Ulrich, Anne S. ^{[2
,5
,6
]}

Hahn, Horst ^{[1
,2
,3
]}

机构：

[1] Karlsruhe Inst Technol, Inst Nanotechnol, D-76021 Karlsruhe, Germany

[2] Karlsruhe Inst Technol, DFG Ctr Funct Nanostruct CFN, D-76131 Karlsruhe, Germany

[3] Tech Univ Darmstadt, Karlsruhe Inst Technol, Joint Res Lab Nanomat, D-64287 Darmstadt, Germany

[4] Karlsruhe Inst Technol, Inst Inorgan Chem, D-76131 Karlsruhe, Germany

[5] Karlsruhe Inst Technol, Inst Organ Chem, D-76131 Karlsruhe, Germany

[6] Karlsruhe Inst Technol, Inst Biol Interfaces IBG 2, D-76021 Karlsruhe, Germany

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2011年 / 115卷 / 14期

关键词：

TIN OXIDE; NANOCRYSTALLINE; SIZE; FABRICATION; DIFFUSION; SHAPE; NANOPARTICLES; PERCOLATION; COMPOSITES; TRANSPORT;

D O I：

10.1021/jp200651m

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We studied the local structural disorder and relaxation in different nanostructures of SnO2 by using Sn-119 MAS NMR in combination with Sn-119 Mossbauer spectroscopy. We investigated nanocrystalline powders with an average crystallite size of 8 nm as well as hollow spheres with a wall thickness of 3 nm and a diameter of 14 nm, and compared the results to coarse-grained materials. Whereas the uniform SnO6 octahedra in the coarse-grained material show a well-known distortion and thus large electric field gradients, the nanocrystalline SnO2 exhibits a structural relaxation leading to a distribution of local environments and more symmetric octahedra. The SnO2 hollow spheres show strong local disorder in combination with highly asymmetric environments around the Sn atoms.

引用

页码：6433 / 6437

页数：5

共 48 条

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