Selective Chain Reaction of Acetone Leading to the Successive Growth of Mutually Perpendicular Molecular Lines on the Si(100)-(2×1)-H Surface

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• 作者：Md. Zakir Hossain ; Hiroyuki S. Kato ; Maki Kawai
• 刊名：Journal of the American Chemical Society
• 出版年：2007
• 出版时间：October 10, 2007
• 年：2007
• 卷：129
• 期：40
• 页码：12304 - 12309
• 全文大小：396K
• 年卷期：v.129,no.40(October 10, 2007)
• ISSN：1520-5126

文摘

The successive growth of mutually perpendicular molecular lines from one dangling-bond (DB)site on the Si(100)-(2×1)-H surface has been realized through a substrate-mediated chain reaction at 300K. Among various molecules, acetone molecules undergo the most facile chain reaction with a DB site,which proceeds selectively on the Si(100)-(2×1)-H surface, resulting in only single molecular lines in theparallel-row (parallel to the dimer row) direction. The smaller size and higher reactivity of acetone moleculesenable us to successively grow a parallel-row acetone line from the end of a cross-row (perpendicular tothe dimer row) allylmercaptan line simply by changing the feed of gas molecules into the reaction chamber.Since the length of a molecular line is controlled by the number of gas molecules impinged, it is possibleto turn a chain reaction from the cross-row direction to the parallel-row direction at any desired point onthe surface. The reaction path of the adsorbing molecules is discussed. The present study provides a newmeans of fabricating mutually perpendicular molecular lines through a chain reaction initiating at apreselected DB site on the Si(100)-(2×1) surface.