Autocatalytic oxidation of lead crystallite surfaces

被引:94
作者
Thürmer, K
Williams, E
Reutt-Robey, J [1 ]
机构
[1] Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA
[2] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
关键词
D O I
10.1126/science.297.5589.2033
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
Growth of an ultrathin lead oxide layer causes massive changes in the shape of lead crystallites. The dynamics of this process was investigated with time-lapsed scanning tunneling microscopy. Pure lead crystallites proved extremely resistant to oxidation. Once nucleated by surface impurities, monolayer films of lead oxide grew readily on lead (111) microfacets in an autocatalytic process. The anisotropic growth of orthorhombic lead oxide films (massicot structure) was most rapid along the direction of weakest lead-oxygen bonding, which suggests that the growth edge autocatalyzes oxygen dissociation by providing proximal sites for oxygen dissociation and attachment.
引用
收藏
页码:2033 / 2035
页数:4
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