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Direct Synthesis of Nickel(ii) Tetraphenylporphyrin and Its Interaction with a Au(111) Surface Studied with Photoemission Spectroscopy

Author: ChenMin
Tutor: ZhuJunFa
School: University of Science and Technology of China
Course: Nuclear Technology and Applications
Keywords: NEXAFS XPS UPS Ni NiTPP Au (111) Molecular orientation In situ metal complex Interfacial charge effect
CLC: TG111.1
Type: Master's thesis
Year: 2009
Downloads: 12
Quote: 0
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Abstract


The porphyrin molecule widely exist in nature , and plays an important role in areas such as medicine, materials science . Their metal compounds , namely metal porphyrins, many living body reaction of the enzyme active center . Recently, the metal porphyrin molecule layer is increasingly used in the surface localized coordination chemistry basic research . This research has focused on the surface chemical reaction , such as a porphyrin direct metallization , additional functional group ligand and a surface ligand bond characteristics . This thesis using photoelectron spectroscopy (PES) and synchrotron radiation near edge X-ray absorption fine structure (NEXAFS) study of Ni / porphyrins / Au (111) system , and the results achieved mainly include the following aspects : 1 ) in ultra-high vacuum environment , the thermal evaporation deposition tetraphenyl the porphyrin ( 2HTPP ) molecule to a clean Au (111) surface , as in situ complexation Ni ( II ) - the tetraphenylporphyrin ( NiTPP ) reaction of ligand ; using synchronous radiation the NEXAFS experiments prove the multilayer molecular film has a high degree of orderliness . Subsequently, the multilayer film of 2HTPP stepwise annealing , the XPS spectra of the C 1s that the on 520K moderate annealing time can be obtained by an orderly arrangement in the Au (111) on a surface of monolayer 2HTPP molecules , and this monomolecular layer at least temperature 580K. 2) the use of photoelectron spectroscopy study , the SIN 2HTPP molecular layer subsequently deposited adsorption reaction between the Ni atom in the Au (111) surface in situ preparation NiTPP . The contrary , if the first part of the Ni atoms to the Au (111) surface is deposited , and then deposited 2HTPP molecular , chemical reaction of the same ligand will still occur . 3) The combination of X-ray photoelectron spectroscopy (XPS) and vacuum ultraviolet spectroscopy ( UPS ) , we explore the the monolayer NiTPP / Au ( 111 ) interface electronic structure . The study showed that the complexation Ni2 substrate Au (111) interface between the charge interaction is weak .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallurgy ( Physical Metallurgy ) > Physics of metals > The electron theory of metals
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