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Monolayer and Its Application in the Synthesis of Selenium Nanocomposite

Author: HanChengXiang
Tutor: ShenYuHua
School: Anhui University
Course: Inorganic Chemistry
Keywords: Monolayer Nanoselenium LB film Situ-reduction Induced
CLC: TB383.1
Type: Master's thesis
Year: 2006
Downloads: 83
Quote: 1
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Abstract


The Langmuir monolayer and LB film have been studied with much interest because they can be controlled at molecule level and provided an important technology for assembling organic, organic/inorganic nanocomposite film with mono-/multi layers. The nanoparticles can be assembled or packed to form two and three-dimensional well-ordered arrangements by LB techniques. So in this paper, 3-ferrocenyl-2-butylene acid （FCA） and 2-hexadecyloxyaniline(2-C16OAn) were synthesized and assembled into monolayers and LB films. The octadecylamine （ODA）/ vitamin C（VC）, vitamin E （VE） and 2-C16OAn monolayers were used to prepare the nanoselenium and the LB ultra thin film with selenium nanoparticles. The paper is separated into four parts that are shown as follows:1. A new amphiphilic ferrocene derivative （FCA） was synthesized and assembled into FCA/ODA mixed monolayers, whose properties were investigated by suface pressure-molecule area （π-A） isotherms, dπ/dA-A curves and the plot of the apparent area of ODA（Aoda） vs x（ODA）. The results indicated that the mixed monolayers containing FCA/ODA mixture with mole proportion of 1 to 1 possessed the best stability and the highest incompressibility.2. The properties of ODA monolayer on pure water and H2SeO3 aqueous solution at different pH was studied by n-A isotherms and dπ/dA-A curves. The results showed that the monolayer was more stable in the basic subphase than that in the acidic subphase. Nanoselenium with various morphologies was prepared by adding vitamin C into the subphase at pH 1, 3, 9, 11. At basic subphase, spherical selenium nanoparticles were prepared with a diameter of about 37nm, with excellent monodispersity. Because the ODA cation adsorbed more SeO32- at pH 9, more selenium nanoparticles were formed. UV-vis spectra and small angle XRD showed that the ODA/selenium nanoparticles composite monolayer can be successively assembled layer by layer during the whole deposition pocess.

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