Enhanced Field Emission Properties of α-Fe2O3 Nanostructures with the Removal of Adsorbed Gas Molecules

被引：17

作者：

Lu Junpeng ^{[1
]}

Yun Tao ^{[1
]}

Zheng Minrui ^{[1
]}

Haur, Sow Chorng ^{[1
]}

机构：

[1] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2011年 / 115卷 / 17期

关键词：

CARBON NANOTUBES; NANOWIRE; NANOPARTICLES; MORPHOLOGY; OXIDATION; ARRAYS;

D O I：

10.1021/jp200858g

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：

Quasi-1D alpha-Fe2O3 nanostructure arrays of four different morphologies (random nanoflakes, random nanobelts, quasi-aligned nanostrips and quasi-aligned nanoneedles) were successfully synthesized via a simple heating process. Field emission measurements indicate that the alpha-Fe2O3 nanoneedle arrays are superior field emitter exhibiting low turn-on voltage, high current density, and large field-enhancement factor due to better vertical alignment and higher aspect ratio. In addition, we found that adsorbed oxygen molecules greatly hindered the field emission performance a the nanostructures. Prolonged field emission process could drive the oxygen molecules away and give rise to markedly improved and efficient alpha-Fe2O3 nanostructures field emitter. The improved field emission is attributed to desorption of the oxygen molecules during the field emission process.

引用

页码：8816 / 8824

页数：9

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