Acidichromism in the LB film of bolaform Schiff base

A bolaform （BNC10） and single-headed （HNOA） amphiphilic Schiff bases containing naphthyl group were designed and their Langmuir-Blodgett films were investigated. It was found that both the LB films show acidichromism, i.e. a reversible color change upon alternatively exposing the films to HC1 and NH3 gases, respectively. It was further found that the bolaform Schiff bases film could trap NH3 gas during the acidichromic process.

The Aggregates in LB Films of Schiff base Aluminium (III) Complex

The surface pressure-area (pi -A) isotherm of Schiff base aluminium (III), tris (2-hydroxy-5-nitro-N-dodecyl-benzylideneaminato) aluminium (III) (denoted as Al(TAl2)(3)), on pure water subphase was investigated. The molecular area, 0.48 nm(2), is one-third of expected value that indicated the aggregation took place. The Langmuir-Blodgett (LB) films of Al(TAl2), was transferred and characterized. The AFM image confirmed the formation of aggregates.

The LB Films of Dansyl Chloride Labeled Octadecylamine and Its Fluorescence Lifetime

Octadecylamine was derivatized with dansyl chloride (5-dimethylaminonaphthalene-1-sulfonyl chloride) In order to simplify and understand the LB films of fluorescent probe labeling proteins. its monolayer and multilayers in the absence and presence of stearic acid were deposited by LB technique. Fluorescence spectra and lifetimes of the fluorescent products were studied to elucidate the microenvironment of molecules in the LB films.

FLUORESCENCE AND ITS ENHANCEMENT OR QUENCHING OF Eu(TTA)_3 Phen LB FILMS

For the first time, LB films containing Eu(TTA)3Phen are obtained by using composite subphase. Eu(TTA)3Phen itself is dimcult to be transferred onto solid substrate.mixed or alternate LB films are prepared. Hydrogen bonds form between Eu(TTA)3Phen and AA or TPP(-COOH). TOPO and SB have a fluorcscence enhanGement effect on Eu(TTA)3Phen. TPP(-COOH) and Fc have a fluorescence quenching effect on it.

PHASE SEPARATION OF RETINAL SCHIFF BASE IN TWO-COMPONENT LB FILM WITH DIFFERENT LIPIDS

Phase sepertion of 9-cis-retinal schiff base in two-component LB film with different lipids has been observed under Brewster Angle Microscope

Novel Mixed LB Films of Porphyrin and Phthalocyanine Based on Molecular Recognition

The potassium salt of monocarboxylic substituted porphyrin acid mono crown ether substituted phthalocyanine can form heterodimer in solution and this kind of heterodimer can be fabricated into highly ordered LB films. The structures of the film were identified by absorption spectra polarized absorption spectra and low angle X-ray diffraction methods.

A New Method of Photopatterning with LB Films Based on a Chemically Amplified Mechanism

A new approach to introducing a photoacid generator（PAG） into Langmuir-Blodgett （LB） films to draw photopatterns as a lithographic process is described here. The chemically amplified positive-tone resist system used here consists of two components ： a copolymer, poly （ dodecrylacrylamide-co-4-t-butyloxylvinyl-phenylcarbonate ） [ P （ DDA-t- BVPC53 ） ] and a PAG, tri （2,3-dibromopropyl） isocyanurate （ TDBPIC ）. In the two-component system, the acid generated by the PAG catalyzes the deprotection reaction of P（ DDA-t-BVPC53）, to remove the tert-butoxycarbonyl group（t-BOC） in the exposed region during the postexposure baking process, thus rendering the exposed region soluble to alkaline aqueous solvents to form a positive tone. Photolithographic properties of the LB films have been evaluated. The patterns can be resolved with a resolution of 1 μm line width by UV irradiation, followed by development with an alkaline solution. The LB films can be used to generate etched gold relief images on a glass substrate via an aqueous iodide, like ammonium iodide, in alcohol/water as the etchant. The etch resistance of such LB films is sufficiently good, allowing patterning of a gold film suitable for photomask fabrication.

Structure and Orientation of 1-(Hydroxyl)-5-(dodecyloxy)-naphthalene LB Films by Polarized Fluorescence Spectroscopy

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Preparation and Luminescence Properties of LB Films Based on 4-Hexadecyloxybenzoic Terbium

LB films of 4 hexadecyloxybenzoic terbium by using the subphase containing Tb 3+ were prepared. The monolayer behavior of 4 hexadecyloxybenzoic acid (HOBA) on the subphase containing rare earth ions was studied. IR and UV spectra show that the rare earth ions were bound to carboxylic acid head groups and the coordination took place between the polar head group and the rare earth ions. The luminescence spectra show that the LB films have the fine luminescence properties, and the LB films emit strong luminescence under UV light irradiation.

Bis-radicals (nitronyl nitroxide and imino nitroxide) Substituted Benzene with Long Alkyl Chain: Synthesis, Magnetic Study and Formation of LB film

The titled compound 1 as well as compounds 2 and 3 with similar chemical structures were prepared and characterized. The magnetic properties of 1 were investigated with SQUID (MPMS, quantum design) magnetometer. Studies with Langmuir-Blodgett (LB) technique indicated that stable condensed film of 1 could be formed at air-water interface and could be transferred onto various solid substrate under suitable conditions.

X-Ray Photoelectron Spectroscopic Study on the Synthesis of Copper Sulphide in LB Films( Ⅱ )

The present paper covers the formation process of copper sulphide in copper stearate Langmuir-Blodgett films studied carefully by XPS. The further identification of sulfur species and the examination of its change in the reaction have been made. Also the formation mechanism of sulfur species in the special microenvironment-LB films is discussed.

Synthesis and Structure of PEDOT Prepared through a Modified LB Film Method

Adopting LB film method, an arachidic acid （AA）/PEDOT multilayer LB film and polymerized EDOT monomers in hydrophilic group of LB were chosen to prepare the arachidic acid （AA）/PEDOT multilayer LB film. UV-Vis, FT-IR and XPS analyses implied that EDOT was effectively polymerized in film, and thus PEDOT conducting polymer was produced. Analyses of XRR and SIMS indicated that the film had a well-arranged lamella structure, and further research showed that polymerization of EDOT in AA film destroyed the orderliness of the original LB film. This phenomenon could be related to the destructive effect of polymerization on the layered structure. We used four-point probe and semiconductor instrument to study the conductivity property of the film, and observed that the conductivity of AA/PEDOT film had sudden changes with the changes of processing time in an effective conduction network, which was caused by ＂permeability＂ in conducting channel of multilayer film. The test results also indicated that the conductivity of AA/PEDOT film was obviously better than that of spin-coating PEDOT/PSS or ODA-SA/PEDOT-PSS film due to the higher π structure of PEDOT structure and ordered film structure.

Gas Sensitivity of Poly (3, 4-ethylene dioxythiophene) Prepared by a Modified LB Film Method

An arachidic acid/poly （3, 4-ethylene dioxythiophene） （AA/PEDOT） multilayer Langmuir-Blodgett （LB） film was prepared by a modified LB film method. The theories were utilized to explain the effects between HCl molecule and LB film. The gas sensitivity mechanism of poly （3, 4-ethylene dioxythiophene） （PEDOT） multilayer film can be explained by the charge transfer between p system of PEDOT and oxidization HCl system. The gas sensitivity of PEDOT LB film deposited interdigital electrode to HCl was tested. The results showed that film thickness, treating temperature, deposition speed had different influence on film gas sensitivity. The AA/PEDOT film deposited device exhibited nonlinear behavior to HCl gas at lower concentration （20-60 ppm） and linear response behavior at higher gas concentration was observed. The time of the compound LB film of the AA/PEDOT responding to the 30 ppm HCl gas is about 20 seconds, which is far quicker than the time of the film to the PEDOTPRESS film（about 80 seconds）. It is not higher film press to better film. When the film press attains 45 mNs/m, the sensitivity of the AA/PEDOT film on the contrary descends.

SCANNED LASER SPOT PHOTOCURENT RESPONSE STUDIES OF FERROCENE DERIVATIVE LB FILMS MODIFED CdSe THIN FILM ELECTRODES

Photheurrent behaviours of 1,1'-di linolene ferrocenyl LB films modified CdSe thin film electrode were studied by scanned laset spot method. The increase in photocurrent response of modified electrode compared to the bare electrode was analyzed by statistical calculation. The acceleration of interfacial electron transfer by modified molecules which act as redox mediator was discussed.

Study on Alternating LB Films of Charge-Transfer Complex of Octadecyl-TCNQ and Copper Phthalocyanine Derivative

Infrared spectra of alternating LB films of octadecyl-TCNQ/CuPc are studied. Charge-transfer complexes are formed in LB films and conductance increases about three orders than that of pure CuPc LB films.

SYNTHESIS OF A NEW KIND OF AMPHIPHILIC COPOLYMER AND CHARACTERIZATION OF THEIR LB FILMS

A new kind of amphiphilic copolymer was synthesized with azo bond functional side chains, and elementary studies about formation of I,B film, UV-visible spectra and photoelectrical properties of multilayers of this kind of amphiphilic copolymer were reported.

STUDIES ON LANGMUIR-BLODGETT FILM OF METAL COMPLEXES(Ⅰ)-PREPARATION AND CHARACTERIZATION OF THE LB FILM OF N-HEXADECYL PYRIDINIUM TETRAKIS(1-PHENYL-3-METHYL-4-BENZOYL-PYRAZOL-5-ONE)EUROPIUM,C_5H_5NC_(16)H_(33)Eu(PMBP)_4

The LB film of the title complex was prepared by dropping a benzene solution of the title complex on the surfaceof water subphase at 25±1℃.The film was deposited in Z type on various hydrophilic pretreated substrates ofquartz,CaF;and electronic conductive glass for different purposes.The π-A curve of the film shows that thecross section per molecule is 125;,which indicates that the alkyl chain of the molecule is basically perpendiculalto the surface of the substrate.UV,IR spectra and transmission electronic microscopy of the film were also obtained.

Luminescent Properties of Europium Complexes with Different Long Chains in Langmuir-Blodgett (LB) Films

A series of europium(III) complexes with different chain length, tris [2-m-pyridylmethanamido-5-phenyl- (1,3,4)-oxadiazole] mono [2-(4-n-alkylphenyl)-iminazole (4,5-f)-1,10-phenanthroline] Eu(III) [Eu(PMA)3Nn (n = 6, 10, 14,18)] were synthesized. All of these amphiphilic europium(III) complexes could form stable Langmuir film at air/water interface and could be transferred onto hydrophilic quartz and mica substrates by measurement of UV spectra in which the absorbance of the LB films at about 288 nm scales showed the linearity with the number of layers deposited. In order to investigate relation between fluorescence properties and the arrangement of molecular in LB films, surface topography of monolayer films were observed by atomic force microscopy (AFM). Results showed that the emission spectra have Eu(III) characteristic peaks and strong emission strength. It is interesting that the molecular with looser arrangement in LB films has better monochromacity, which illustrated that energy might transferred more easily from ligand to Eu(III) in loosen structure films.

The Mixed LB film of Crowned Phthalocyanine and Picrate

The mixed LB film of mono crown ether substituted phthalocyanine (CPc) and potassium picrate (PiK) were prepared by adding potassium picrate in subphase. The pi-A isotherms show that the addition of PiK in subphase increases the orientation angles of phthalocyanine in monolayers. The absorption spectra revealed that the monolayer can be transferred to substrates easily. X-ray diffraction results show that the mixed film possesses the same thickness as that of pure phthalocyanine film.

Highly Ordered LB Films of Amphiphilic Complexes With 8-Hydroxyquinoline

Amphiphilic complexes of N-octadecyl-8-hydroxy-2-quinoline carboxamide, M (OQ)(2), form stable monolayer on pure water subphase and can be easily fabricated as highly ordered and uniform LB films, which were characterized by absorption spectra and low-angle X-ray diffraction measurements.