Investigation On The Construction And Fundamental Application Of Molecular Devices

Molecular systems capable of performing switch and logic operations are of great scientific interest since they can be used in data-processing that are in high demand in information technology. A host of efforts have been directed to research of molecular device and molecular electronic devices. In this dissertation, three different molecular devices have been designed, including:(1)Three kinds of redox-mediated behavior were realized at an azobenzene-functionalized electrode.(2)We demonstrated that a useful molecule,4-(2-Pyridylazo)-resorcinol (PAR), could perform functions of two kinds of reversible fluorescent switches modulated by solution pH. Furthermore, stimulated by various combinations of external inputs, such as UV irradiation, solution pH and metal ions, the system could implement multiple logic functions.(3)Cellular sensors with surface-confined ferrocene as electron transfer mediator were developed to study the immobilization of human cervical carcinoma (HeLa) cells. With layer-by-layer (LBL) technique, positively charged ferrocene functionalized poly(allylamine hydrochloride)(Fc-PAH) and negatively charged single-wall carbon nanotubes (SWNTs) were alternately assembled on3-mercaptopropionic acid (MPA) modified gold substrates. With differential pulse voltammetry (DPV) measurements the as-prepared sensors exhibited high sensitivity to the detection of HeLa cells with a wide concentration range from10to107cells/mL.