Supporting Online Materials For gh Performance Lithium Battery Anodes Using Silicon Nanowires Candace k. Chan, Hailin Peng, Gao Liu, Kevin Mcllwrath, Xiao Feng zhang, Robert A. huggins and yi cui *To whom correspondence should be addressed. E-mail: yicui@stanford.edu This pdf file includes: Materials and Methods Fig sI to S5 Materials and methods Single-crystalline Si nanowires(SiNWs) were grown inside a tube furnace using the vapor-liquid-solid growth method. Stainless steel 304(0.002 thick, McMaster-Carr) substrates were decorated with Au catalysts, either by functionalizing with 0.1% w/v aqueous poly-L-lysine solution(Ted Pella)and dipping into 50 nm diameter Au colloid solution (Ted Pella), or by evaporating 75 nm Au using e-beam evaporation and annealing for 30 min at 530C just prior to growth. The substrates were heated to 530C and silane(SiH4, 2% in Ar) was flowed in at 80 sccm with a total chamber pressure of 30 Torr. The mass of the SiNWs in a given experiment (-500 ug) was accurately determined by measuring the mass of the substrate using a microbalance(Sartarious SE2, 0. 1 ug resolution) before and after growth. The a-FeSi2 also formed during growth(as e 2007 Nature Publishing Group© 2007 Nature Publishing Group Supporting Online Materials For High Performance Lithium Battery Anodes Using Silicon Nanowires Candace K. Chan, Hailin Peng, Gao Liu, Kevin McIlwrath, Xiao Feng Zhang, Robert A. Huggins and Yi Cui* *To whom correspondence should be addressed. E-mail: yicui@stanford.edu. This PDF file includes: Materials and Methods Fig. S1 to S5 Materials and Methods Single-crystalline Si nanowires (SiNWs) were grown inside a tube furnace using the vapor-liquid-solid growth method. Stainless steel 304 (0.002” thick, McMaster-Carr) substrates were decorated with Au catalysts, either by functionalizing with 0.1% w/v aqueous poly-L-lysine solution (Ted Pella) and dipping into 50 nm diameter Au colloid solution (Ted Pella), or by evaporating 75 nm Au using e-beam evaporation and annealing for 30 min at 530 °C just prior to growth. The substrates were heated to 530 °C and silane (SiH4, 2% in Ar) was flowed in at 80 sccm with a total chamber pressure of 30 Torr. The mass of the SiNWs in a given experiment (~500 μg) was accurately determined by measuring the mass of the substrate using a microbalance (Sartarious SE2, 0.1 μg resolution) before and after growth. The
-FeSi2 also formed during growth (as