Surface-potential reversibility of an amino-terminated self-assembled monolayer based on nanoprobe chemistry.
Surface-potential reversibility of an amino-terminated self-assembled monolayer based on nanoprobe chemistry.
复制标题
DOI：
10.1021/jp044943k
复制
发表时间：
2005-06
期刊：
影响因子：
--
通讯作者：
N. Saito;Sun-Hyung Lee;Ishizaki Takahiro;J. Hieda;H. Sugimura;O. Takai
中科院分区：
文献类型：
--
作者：
N. Saito;Sun-Hyung Lee;Ishizaki Takahiro;J. Hieda;H. Sugimura;O. Takai
纳米探针化学为利用扫描探针显微镜的尖端构建由有机分子组成的纳米结构提供了一种很有前途的方法。在之前的报道中，我们证明了应用纳米探针电化学技术可以将有机硅烷自组装单层上的亚硝基端表面转化为氨基端表面。本文报道了氨基和亚硝基之间的可逆化学反应产生的表面电位可逆性。此外，我们证明了基于这种化学可逆性的表面电位记忆。以对氨基苯基三甲氧基硅烷为原料，采用化学气相沉积法制备了氨基端sam。表面电位由开尔文力显微镜测定。当扫描探针在正偏置电压下进行光刻时，扫描区域的表面电位向负方向剧烈移动。负偏压扫描导致扫描区域的表面电位正移位。即使在施加正、负偏置电压多次扫描后，表面电位也能恢复。在这一发现的基础上，我们还通过纳米探针电化学技术成功地展示了表面电位记忆。
Nanoprobe chemistry offers a promising approach for the construction of nanostructures consisting of organic molecules by employing the tip of a scanning probe microscope. In a previous report, we demonstrated that a nitroso-terminated surface on an organosilane self-assembled monolayer could be converted into an amino-terminated surface by applying such a nanoprobe electrochemical technique. This paper reports on surface-potential reversibility originating from a reversible chemical reaction between amino and nitroso groups. In addition, we demonstrate surface-potential memory based on this chemical reversibility. Amino-terminated SAMs were prepared from p-aminophenyl-trimethoxysilane through chemical vapor deposition. Surface potentials were acquired by Kelvin force microscopy. When scanning probe lithography was conducted with a gold tip at positive-bias voltages, the surface potential of the scanned area shifted dramatically in the negative direction. Scanning with negative-bias voltages led to positive shift in the surface potential of the scanned area. The surface potential could be recovered even after multiple scannings with positive and negative applied bias voltages. On the basis of this discovery, we also succeeded in demonstrating surface-potential memory via our nanoprobe electrochemical technique.