Investigation On The Preparation And Performance Of Layer-by-layer Self-assembly Films By Strong Non Covalent Bond

In this report, some layers self-assembly film such as carbon nano tube film (MWNT), carbon nano tube (MWNT)/porphyrin (TPP), carbon nano tube (MWNT)/cadmium telluride (CdTe) was produced by using the driving force of2ureido-4[1H] pyrimidine multiple hydrogen bonds, ionic bond and other Strong non covalent bond which has the strong association ability. Also, the self-assembly behavior and photoinduced electron transfer on self-assembly film was studied in this report. As follows:1. The carbon nano tube layers self-assembly film drived by multiple hydrogen bonds.Multiple hydrogen bonds unit modified by UPy (MWNT-UPy) was synthesized by the reaction of amidogen and isocyanate. The structure of this compound can be characterized by infrared spectrum and ultraviolet-visible spectrum. In CHCl3, MWNT-UPy can form self-support film with the conductivity of10s/cm depending on complementary AADD4hydrogen bonds after suction filtration. By using the method of layers self-assembly, it is possible to synthesize the compact and even carbon nano tube layers self-assembly film with high cover degree based on the driving force of AADD4hydrogen bonds. According to the analysis of SEM and XPS, it is proved that the driving force of layers self-assembly is hydrogen bond. The deposition of MWNT-UPy on the self-assembly film can be controlled by solvent, time of assembling, layers of assembling. Due to the effect of strong hydrogen bond, this self-assembly film has good stability; so it can be steeped in DMF, CHCl3and H2O reiteratively over6hrs. Electrochemistry experiment proves preliminarily that electrochemistry activity of MWNTs-UP film is better than empty ITO pole. It is expected that the MWNT-UPy layers self-assembly film will be applied widely in fuel cell, super capacitor and etc..2. Carbon nano tube (MWNT)/porphyrin (TPP) layers self-assembly film drived by multiple hydrogen bonds.According to chemistry modification method, UPy multiple hydrogen bonds should be introduced on carbon nano tube and porphyrin respectively. The structure of this compound can be characterized by infrared spectra and and H1-NMR. According to study TEM and ultraviolet-visible spectrum of TPP-UPy/MWNT-UPy multiple hydrogen bonds in solution, it is possible to prove that supramolecular system has been formed in solution. Then the TPP-UPy/MWNT-UPy layers self-assembly film can be produced by driving force of hydrogen bond. Ultraviolet-visible spectrum and SEM image proves that layers self-assembly film can be produced depending on the driving force of UPy multiple hydrogen bonds. Electrochemistry experiment proves that electron interaction occurs between TPP and MWNT in TPP-UPy/MWNT-UPy layers self-assembly film. Fluorescence quenching spectrum and fluorescence lifetime analysis proves further that photoinduced electron transfer can occur from TPP to MWNT in Supramolecular film.3. Carbon nano tube (MWNT)/cadmium telluride (CdTe) layers self-assembly film drived by ionic bondAccording to the reaction of CdCl2·2.5H2O, Te powder and mercaptoacetic acid (stabilizer), four different colors of CdTe shiny quantum dots can be produced in water by controlling the time of reflux, and ultraviolet spectrum and Fluorescence spectrum illustrate that quantum dots has been produced successfully. Then utilizing the technique of static layers self-assembly can make carbon nano tube film connected with CdTe. According to Ultraviolet-visible spectrum and TEM and other measuring methods, it can be proved that LBL technique can made nano structure film of CdTe-connected carbon nano tube which has even thickness and even dispersion. XPS result demonstrates that the charge can transfer from carbon nano tube to CdTe in the group state of CdTe/MWNT film. Fluorescence quenching spectrum and fluorescence lifetime analysis proves that photoinduced electron transfer can occur from CdTa to MWNT in CdTe/MWNT film.