Molecular Quantum Cellular Automata Cells. Electric Field Driven Switching of a Silicon Surface Bound Array of Vertically Oriented Two-Dot Molecular Quantum Cellular Automata
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- 作者：Hua Qi ; Sharad Sharma ; Zhaohui Li ; Gregory L. Snider ; Alexei O. Orlov ; Craig S. Lent ; and Thomas P. Fehlner
- 刊名：Journal of the American Chemical Society
- 出版年：2003
- 出版时间：December 10, 2003
- 年：2003
- 卷：125
- 期：49
- 页码：15250 - 15259
- 全文大小：294K
- 年卷期：v.125,no.49(December 10, 2003)
- ISSN：1520-5126
文摘
The amine functionality of the linker on the dinuclear complex [trans-Ru(dppm)2(C
CFc)(NCCH2CH2NH2)][PF6] reacts with Si-Cl bonds of a chlorinated, highly B doped Si (111) surface to yield Si-Nsurface-complex bonds. The surface bound complex is constrained to a near vertical orientation by thechain length of the linker as confirmed by variable angle XPS. Oxidation of the dinuclear complex withferrocenium ion or electrochemically generates a stable, biased FeIII-RuII mixed-valence complex on thesurface. Characterization of the array of surface bound complexes with spectroscopic as well aselectrochemical techniques confirms the presence of strongly bound, chemically robust, mixed-valencecomplexes. Capping the flat array of complexes with a minimally perturbing mercury electrode permits theequalization of the Fe and Ru energy wells by an applied electric field. The differential capacitance ofoxidized and unoxidized bound complexes is compared as a function of voltage applied between the Hggate and the Si. The results show that electron exchange between the Fe and Ru sites of the array ofdinuclear mixed-valence complexes at energy equalization generates a fluctuating dipole that produces amaximum in the capacitance versus voltage curve for each complex-counterion combination present.Passage through the capacitance maximum corresponds to switching of the molecular quantum cellularautomata (QCA) cell array by the electric field from the FeIII-RuII configuration to the FeII-RuIII configuration,thereby confirming that molecules possess an essential property necessary for their use as elements of aQCA device.
CFc)(NCCH2CH2NH2)][PF6] reacts with Si-Cl bonds of a chlorinated, highly B doped Si (111) surface to yield Si-Nsurface-complex bonds. The surface bound complex is constrained to a near vertical orientation by thechain length of the linker as confirmed by variable angle XPS. Oxidation of the dinuclear complex withferrocenium ion or electrochemically generates a stable, biased FeIII-RuII mixed-valence complex on thesurface. Characterization of the array of surface bound complexes with spectroscopic as well aselectrochemical techniques confirms the presence of strongly bound, chemically robust, mixed-valencecomplexes. Capping the flat array of complexes with a minimally perturbing mercury electrode permits theequalization of the Fe and Ru energy wells by an applied electric field. The differential capacitance ofoxidized and unoxidized bound complexes is compared as a function of voltage applied between the Hggate and the Si. The results show that electron exchange between the Fe and Ru sites of the array ofdinuclear mixed-valence complexes at energy equalization generates a fluctuating dipole that produces amaximum in the capacitance versus voltage curve for each complex-counterion combination present.Passage through the capacitance maximum corresponds to switching of the molecular quantum cellularautomata (QCA) cell array by the electric field from the FeIII-RuII configuration to the FeII-RuIII configuration,thereby confirming that molecules possess an essential property necessary for their use as elements of aQCA device.