Phenylthiophene (P2PT) has been electrochemically polymerized in pure boron trifluoride diethyl ether (BFEE) solutions or in a com p osite electrolyte of BFEE and trifluoroacetic acid (TFA).The addition of a certa in ...Phenylthiophene (P2PT) has been electrochemically polymerized in pure boron trifluoride diethyl ether (BFEE) solutions or in a com p osite electrolyte of BFEE and trifluoroacetic acid (TFA).The addition of a certa in amount of TFA into BFEE lowered the oxidation potential of the monomer,accelerat ed the polymerization and also increased the current efficiency of the electrosy nthesis.The morphology and electrochemical behavior of as\|grown P2PT films were studied by scanning electron microscopy and cyclic voltammetry.Poly(2\|phenylth iophene) in dedoped state is soluble in usual organic solvents such as tetrahydr ofuran and chloroform,etc.Its structure has been examined by infrared,Raman and UV\|visible spectroscopies.The molecular weight of the polymer was measured to b e about 800 Da.Fluorescent spectral studies indicate the polymer is a blue\|gree n light emitter.展开更多
Thianaphthene has been electrochemically polymerized in pure boron trifluoride diethyl etherate(BFEE) solution or in a composite electrolyte of BFEE and concentrated sulfuric acid(SA).The addition of certain amount of...Thianaphthene has been electrochemically polymerized in pure boron trifluoride diethyl etherate(BFEE) solution or in a composite electrolyte of BFEE and concentrated sulfuric acid(SA).The addition of certain amount of sulfuric acid into BFEE accelerated the polymerization and also increased the current efficiency of the electrosynthesis.Polythianaphthene(PTN) in dedoped state is soluble in usual strong polar organic solvents such as dimethyl sulfoxide(DMSO), N,N dimethylformamide(DMF) and N methyl pyrrolidinone(NMP).Its structure has been examined by infrared and UV spectra.Fluorescent spectral studies indicate the polymer is a strong blue light emitter.展开更多
Poly(2-methoxy-5-(2′-ethylhexyloxy)- p -phenylenevinylene) (MEH-PPV) has been prepared by a liquid/solid two-phase reaction.The liquid phase is tetrahydrofuran containing 1,4-bis(chloromethyl)-2-methoxyl-5-(2′-ethyl...Poly(2-methoxy-5-(2′-ethylhexyloxy)- p -phenylenevinylene) (MEH-PPV) has been prepared by a liquid/solid two-phase reaction.The liquid phase is tetrahydrofuran containing 1,4-bis(chloromethyl)-2-methoxyl-5-(2′-ethylhexyloxy) benzene as the monomer and a certain amount of tetrabutylammonium bromide (TBAB) as phase transfer catalyst (PTC).The solid phase is potassium hydroxide particles with diameters smaller than 0 5 mm.Gelation was found in the polymerization processes.As a result,MEH-PPV is partly soluble because of its large molar mass.Soluble MEH-PPV was obtained by using bromomethylbenzene as retardant regent.The molar mass of soluble MEH-PPV was measured to be 6 4×10 4g/mol.The Structure of polymer was identified by IR,Raman,UV/vis and PL spectra.A thin compact film of MEH-PPV can be formed by spin-coating and it emit a yellow light.展开更多
A method of fabricating gold nanoparticle coated polypyrrole(PPy) tubules was developed by coating citrate-reduced gold nanoparticles on polypyrrole tubule templates. The PPy tubules were grown uniformly with a diamet...A method of fabricating gold nanoparticle coated polypyrrole(PPy) tubules was developed by coating citrate-reduced gold nanoparticles on polypyrrole tubule templates. The PPy tubules were grown uniformly with a diameter of 200 nm, which is in agreement with that of the pore size of the microporous polycarbonate(PC) membrane template. The Au particles formed by citrate reduction can be deposited on the surface of the PPy tubules. Electrostatic interaction between gold nanoparticles and PPy tubules was used as a driving force for this assembly process. The TEM image shows that a submonolayer coating of the particles was formed.The Au nanoparticle coated PPy tubules was applied to hold and analyze trace molecules as signal-enhancing cuvettes for Raman spectroscopy. Their SERS-activity was tested with Rhodamine B. In contrast with the neat PPy tubule, the Raman scattering of trace Rhodamine B on the Au nanoparticle-coated tubule was enhanced by a factor of 105. This work develops a cheap and convenient method to fabricate gold nanocrystal coated PPy tubule and its application as fabrication of Raman signal enhancing cuvette.展开更多
文摘Phenylthiophene (P2PT) has been electrochemically polymerized in pure boron trifluoride diethyl ether (BFEE) solutions or in a com p osite electrolyte of BFEE and trifluoroacetic acid (TFA).The addition of a certa in amount of TFA into BFEE lowered the oxidation potential of the monomer,accelerat ed the polymerization and also increased the current efficiency of the electrosy nthesis.The morphology and electrochemical behavior of as\|grown P2PT films were studied by scanning electron microscopy and cyclic voltammetry.Poly(2\|phenylth iophene) in dedoped state is soluble in usual organic solvents such as tetrahydr ofuran and chloroform,etc.Its structure has been examined by infrared,Raman and UV\|visible spectroscopies.The molecular weight of the polymer was measured to b e about 800 Da.Fluorescent spectral studies indicate the polymer is a blue\|gree n light emitter.
文摘Thianaphthene has been electrochemically polymerized in pure boron trifluoride diethyl etherate(BFEE) solution or in a composite electrolyte of BFEE and concentrated sulfuric acid(SA).The addition of certain amount of sulfuric acid into BFEE accelerated the polymerization and also increased the current efficiency of the electrosynthesis.Polythianaphthene(PTN) in dedoped state is soluble in usual strong polar organic solvents such as dimethyl sulfoxide(DMSO), N,N dimethylformamide(DMF) and N methyl pyrrolidinone(NMP).Its structure has been examined by infrared and UV spectra.Fluorescent spectral studies indicate the polymer is a strong blue light emitter.
文摘Poly(2-methoxy-5-(2′-ethylhexyloxy)- p -phenylenevinylene) (MEH-PPV) has been prepared by a liquid/solid two-phase reaction.The liquid phase is tetrahydrofuran containing 1,4-bis(chloromethyl)-2-methoxyl-5-(2′-ethylhexyloxy) benzene as the monomer and a certain amount of tetrabutylammonium bromide (TBAB) as phase transfer catalyst (PTC).The solid phase is potassium hydroxide particles with diameters smaller than 0 5 mm.Gelation was found in the polymerization processes.As a result,MEH-PPV is partly soluble because of its large molar mass.Soluble MEH-PPV was obtained by using bromomethylbenzene as retardant regent.The molar mass of soluble MEH-PPV was measured to be 6 4×10 4g/mol.The Structure of polymer was identified by IR,Raman,UV/vis and PL spectra.A thin compact film of MEH-PPV can be formed by spin-coating and it emit a yellow light.
文摘A method of fabricating gold nanoparticle coated polypyrrole(PPy) tubules was developed by coating citrate-reduced gold nanoparticles on polypyrrole tubule templates. The PPy tubules were grown uniformly with a diameter of 200 nm, which is in agreement with that of the pore size of the microporous polycarbonate(PC) membrane template. The Au particles formed by citrate reduction can be deposited on the surface of the PPy tubules. Electrostatic interaction between gold nanoparticles and PPy tubules was used as a driving force for this assembly process. The TEM image shows that a submonolayer coating of the particles was formed.The Au nanoparticle coated PPy tubules was applied to hold and analyze trace molecules as signal-enhancing cuvettes for Raman spectroscopy. Their SERS-activity was tested with Rhodamine B. In contrast with the neat PPy tubule, the Raman scattering of trace Rhodamine B on the Au nanoparticle-coated tubule was enhanced by a factor of 105. This work develops a cheap and convenient method to fabricate gold nanocrystal coated PPy tubule and its application as fabrication of Raman signal enhancing cuvette.
