In Situ TEM Observation of a Microcrucible Mechanism of Nanowire Growth

被引：52

作者：

Boston, Rebecca ^{[1
,2
]}

Schnepp, Zoe ^{[3
]}

Nemoto, Yoshihiro ^{[4
]}

Sakka, Yoshio ^{[4
]}

Hall, Simon R. ^{[1
]}

机构：

[1] Univ Bristol, Sch Chem, Complex Funct Mat Grp, Bristol BS8 1TS, Avon, England

[2] Ctr Nanosci & Quantum Informat, Bristol Ctr Funct Nanomat, Bristol BS8 1FD, Avon, England

[3] Univ Birmingham, Sch Chem, Birmingham B15 2TT, W Midlands, England

[4] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan

来源：

SCIENCE | 2014年 / 344卷 / 6184期

基金：

英国工程与自然科学研究理事会;

关键词：

SUPERCONDUCTOR NANOWIRES; WHISKERS; ARRAYS; WALL; GELS;

D O I：

10.1126/science.1251594

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The growth of metal oxide nanowires can proceed via a number of mechanisms such as screw dislocation, vapor-liquid-solid process, or seeded growth. Transmission electron microscopy (TEM) can resolve nanowires but invariably lacks the facility for direct observation of how nanowires form. We used a transmission electron microscope equipped with an in situ heating stage to follow the growth of quaternary metal oxide nanowires. Video-rate imaging revealed barium carbonate nanoparticles diffusing through a porous matrix containing copper and yttrium oxides to subsequently act as catalytic sites for the outgrowth of Y2BaCuO5 nanowires on reaching the surface. The results suggest that sites on the rough surface of the porous matrix act as microcrucibles and thus provide insights into the mechanisms that drive metal oxide nanowire growth at high temperatures.

引用

页码：623 / 626

页数：4

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