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Preparation and Research of Nano-Assembly

Author: GuoZuo
Tutor: ZhangZuoTong；BaiYuBai
School: Jilin University
Course: Physical and chemical
Keywords: Assembly Characteristics of Gold nanoparticles Specific recognition CdTe Heterostructure Supramolecular interaction Glucan X - ray photoelectron spectroscopy Fluorescence intensity
CLC: TB383
Type: Master's thesis
Year: 2004
Downloads: 339
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Abstract


The preparation and study of nano-scaled assembled structuresare immensely attractive and rapidly expanding area in nano research.In this field, some new results were obtained by different assemblymethods. The main results are outlined as following: Firstly, gold nanoparticles, prepared by the Frens method andcrystal-seed method, have been electrostatically assembled ontomica substrates which were treated with different concentration ofMnCl2 solution. The assemblies have been investigated by means ofatomic force microscopy (AFM). Both the immersing time of bare micain Mn2+ solution and the concentration of Mn2+ solution havesignificant effects on the assembled process of gold nanoparticulatemonolayer. The coverage of gold particles shows periodical evolutionwith the increase of immersing time of mica in MnCl2 solution. Thehigher is the concentration of MnCl2, the shorter is the time toattain maximum coverage. An ion-exchanged and layer dissociatedmechanism is put forth to explain the experimental results above.And such nano-assembly structure was studied as SERS substrate. Secondly, by utilizing Dip-Pen Nanolithography (DPN), proteinand antibody have been first directly written onto Au substratethrough reasonable design. The patterns with submicrometerdimensions were obtained with accurately controlling the size, shapeand site. When using Bovine Serum Albumin (BSA) and PSA as the inkin the DPN procedure, we were able to differentiate between Ausubstrate and patterned area deposited with monolayers throughlateral force microscopy (LFM). The interaction between ink andsubstrate was disccussed according to the data of XPS, FT-IR, etc.Directly writing provides a new, easy and cheap method for preparingbio-nano devices. Thirdly, dextran-coated magnetite nanocomposite was coupledwith anti-HBsAg for biology assay. Magnetite-labled anti-HBsAg wasimmobilized onto Au substrate which was modified with anti-IgGpreviously. In order to distinguish the true recognized sites ofanti-IgG, LFM and MFM measurements were performed as well as AFM.The morphological varation was easily identified. However, LFM andMFM are more accurate than AFM in our experiment, and can further 93<WP=100>吉林大学硕士论文comfirm the specific binding event. This study enhanced ourunderstanding of anti-antibody/antibody binding process. At last, we designed a heterostructure of Fe3O4 and CdTenanocrystals with different space distance controlled bypolyelectrolyte using layer-by-layer (LBL) self-assembly technique.We have investigated the interaction between Fe3O4 and CdTenanocrystals through fluorescence spectra, as well theheterostructure of WO3 and CdTe nanocrystals. The photoluminescence(PL) intensity of the heterostructure of Fe3O4 and CdTe was quenchedwithin a wide range of space distance between two kinds ofnanocrystals, about 30 nm. Unlike the heterostructure of CdTe andFe3O4, PL intensity of the heterostructure of WO3 and CdTe was onlyquenched in the range of about 10 nm. The different mechanism of theenergy transfer of two heterostructures was discussed and thetime-resolved luminescence measurements were executed to makefuther confirmation. 94

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