Spontaneous dissociation of Co(2)(CO)(8) and autocatalytic growth of Co on SiO(2): A combined experimental and theoretical investigation.
Spontaneous dissociation of Co(2)(CO)(8) and autocatalytic growth of Co on SiO(2): A combined experimental and theoretical investigation.
复制标题
DOI:
10.3762/bjnano.3.63
复制
发表时间:
2012
影响因子:
3.1
通讯作者:
Huth M
中科院分区:
文献类型:
--
作者:
Muthukumar K;Jeschke HO;Valentí R;Begun E;Schwenk J;Porrati F;Huth M
We present experimental results and theoretical simulations of the adsorption behavior of the metal–organic precursor Co2(CO)8 on SiO2 surfaces after application of two different pretreatment steps, namely by air plasma cleaning or a focused electron beam pre-irradiation. We observe a spontaneous dissociation of the precursor molecules as well as autodeposition of cobalt on the pretreated SiO2 surfaces. We also find that the differences in metal content and relative stability of these deposits depend on the pretreatment conditions of the substrate. Transport measurements of these deposits are also presented. We are led to assume that the degree of passivation of the SiO2 surface by hydroxyl groups is an important controlling factor in the dissociation process. Our calculations of various slab settings, using dispersion-corrected density functional theory, support this assumption. We observe physisorption of the precursor molecule on a fully hydroxylated SiO2 surface (untreated surface) and chemisorption on a partially hydroxylated SiO2 surface (pretreated surface) with a spontaneous dissociation of the precursor molecule. In view of these calculations, we discuss the origin of this dissociation and the subsequent autocatalysis.
登录
查看更多内容
影响因子:
3
作者:
Grimme, Stefan
通讯作者:
Grimme, Stefan
影响因子:
3.4
作者:
Fernandez-Pacheco, A.;De Teresa, J. M.;Ibarra, M. R.
通讯作者:
Ibarra, M. R.
DOI:
10.1116/1.1481040
发表时间:
2002-07-01
期刊:
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS
影响因子:
--
作者:
Lau, YM;Chee, PC;Ng, V
通讯作者:
Ng, V
影响因子:
3.4
作者:
Friedli, V.;Utke, I.
通讯作者:
Utke, I.
影响因子:
16.6
作者:
Bernau, Laurent;Gabureac, Mihai;Utke, Ivo
通讯作者:
Utke, Ivo