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A study of the adsorption kinetics of 1-octanethiol and 1,8-octanedithiol has been carried out on gold electrode by cyclic voltammetry with different concentrations. Analysis of the kinetic data show that the adsorption kinetics of 1-octanethiol and 1,8-octanedithiol can be satisfactorily described by Diffusion controlled Langmuir(DCL) model, irrespective of concentration. The rate constants of 1-octanethiol...
Sensing applications in the petroleum industry pose unique challenges due to high viscosity and high refractive index of hydrocarbon fluids, which render many fluid-based techniques impractical. Real-time observation of adsorption, desorption, and competitive adsorption processes of long chain functionalized hydrocarbons onto activated cantilevers in static mode are shown. In addition, microcantilevers...
A novel nano Fe3O4-Au modified amperometric immunosensor for rapid separation-free determination of human immunodeficiency virus (HIV) p24 antigen in acquired immunodeficiency syndrome (AEDs) patients' serum is proposed. Firstly, one novel sebacato-bridged Cu(II) phen complex Cu(phen)L2 (referred to as CuL, H2L=sebacic acid; phen=1,10phenanthroline) was absorbed on the surface of glassy carbon electrode...
Self-assembled monolayer (SAM) techniques offer a new strategy for the immobilization of antibodies, antigens and DNA on the surface of quartz crystal electrodes. The quartz crystal microbalance (QCM) system provides a unique opportunity to monitor, in-situ and in real-time, the rate of adsorption of ethanthiol onto gold. The change in frequency resulting from the adsorption of ethanthiol molecules...
Ethanol vapor sensors based on carboxyl-alkanethiolate self-assembled monolayers (SAMs) modified Au/GaAs Schottky diodes were fabricated in this work. The adsorption and arrangement of SAMs with different carbon number on the Au(111) surface were studied by using cyclic voltammetry (CV). Moreover, effects of ethanol vapor concentration and operating temperature on sensing performances were investigated.
This communication presents selective preconcentration of the anesthetic agent (Propofol) and the elimination of unwanted species from a representative sample of human breath. In this approach, a micro preconcentrator (muPC) consisting of embedded high-aspect-ratio pillars (30 mumtimes120 mumtimes240 mum), an outer dimensions of 7 mmtimes7 mm (encompass more than 3500 micro pillars), total inner surface...
The electronic structures of the self-assembled monolayers (SAMs) of n-alkanethiolate [CH3(CH2)nS, n=1-5] on Au(111) surface have been investigated using the state-of-the-art first-principles calculations. The adsorption energy, the tile angle, and the partial charge of n-alkanethiolate were presented. The charge transfer at the metal-molecule interface was calculated by the Mulliken population analysis...
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