通过电化学距离隧穿光谱法将单分子原位连接到电路中。
In situ wiring of single molecules into an electrical circuit via electrochemical distance tunneling spectroscopy.
作者信息
Wierzbinski Emil, Slowinski Krzysztof
机构信息
Department of Chemistry and Biochemistry, California State University, Long Beach, 1250 Bellflower Blvd., Long Beach, California 90840, USA.
出版信息
Langmuir. 2006 Jun 6;22(12):5205-8. doi: 10.1021/la060814e.
The electrical conductance of single n-alkanethiol and alpha,omega-alkanedithiol molecules was measured via in situ distance tunneling spectroscopy in aqueous 0.1 M KOH solution. The statistical analysis of the conductance values show that the alpha,omega-alkanedithiol molecule trapped in the STM break junction can adopt two distinct geometries that result in "lower" and "higher" conductivity values. In contrast, n-alkanethiol molecules trapped in the junction show only a single conductivity value characteristic for a particular molecule. Furthermore, the "lower" conductivity value determined for alpha,omega-alkanedithiol is virtually identical to the electrical conductivity of the n-alkanethiol containing the same number of atoms in the backbone. Moreover when the STM tip is polarized to electrochemical potential preventing a chemical reaction between the terminal -SH group and Au, only "lower" conductivity values are observed for alpha,omega-alkaneditiols.
通过原位距离隧穿光谱法在0.1 M KOH水溶液中测量了单个正链烷硫醇和α,ω-链烷二硫醇分子的电导。对电导值的统计分析表明，被困在STM断结中的α,ω-链烷二硫醇分子可以采用两种不同的几何结构，从而导致“较低”和“较高”的电导率值。相比之下，被困在结中的正链烷硫醇分子仅显示出特定分子特有的单一电导率值。此外，为α,ω-链烷二硫醇确定的“较低”电导率值实际上与主链中含有相同原子数的正链烷硫醇的电导率相同。此外，当STM尖端极化到电化学势以防止末端-SH基团与Au之间发生化学反应时，对于α,ω-链烷二硫醇仅观察到“较低”的电导率值。
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