Controlled switching within an organic molecule deliberately pinned to a semiconductor surface.
Controlled switching within an organic molecule deliberately pinned to a semiconductor surface.
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DOI：
10.1021/nn300690n
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发表时间：
2012-04
期刊：
影响因子：
17.1
通讯作者：
C. Nacci;S. Erwin;K. Kanisawa;S. Fölsch
中科院分区：
文献类型：
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作者：
C. Nacci;S. Erwin;K. Kanisawa;S. Fölsch
双稳有机分子被沉积在弱结合的III-V半导体表面，然后使用单独的天然吸附原子固定在适当的位置。这些钉扎原子在低温扫描隧道显微镜中通过原子精密操纵技术在5K下定位，稳定了π共轭分子免受隧道电子激发的旋转。钉扎允许STM隧道电流触发分子的内在开关机制(氢转移反应)。密度泛函理论计算表明，表面原子和钉扎原子对跃迁过程的能级几乎没有影响。因此，我们已经证明，具有可预测的、预定义的功能的单个分子可以稳定并组装在半导体模板上。
Bistable organic molecules were deposited on a weakly binding III-V semiconductor surface and then pinned into place using individual native adatoms. These pinning atoms, positioned by atomically precise manipulation techniques in a cryogenic scanning tunneling microscope (STM) at 5 K, stabilize the π-conjugated molecule against rotation excited by the tunneling electrons. The pinning allows triggering of the molecule's intrinsic switching mechanism (a hydrogen transfer reaction) by the STM tunnel current. Density-functional theory calculations reveal that the energetics of the switching process is virtually unaffected by both the surface and the pinning atoms. Hence, we have demonstrated that individual molecules with predictable, predefined functions can be stabilized and assembled on semiconductor templates.