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Table of Content
20 November 1990, Volume 8 Issue 4
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PHOTOELECTROCHEMICAL STUDIES OF ELECTROACTIVE MOLECULAR L-B FILM MODIFIED CdSe THIN FILM ELECTRODES
XIAO XU-RUI, LIN YUAN, SUN BI-ROU
1990, 8(4): 241-247. DOI:
10.7517/j.issn.1674-0475.1990.04.241
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CdSe thin film electrodes were modified by L-B films of electroactive molecu.les-ferrocenyl-n-octadecanoale.PEC studies of the modified thin film electrodeswere performed by cyclic voltammetry under irradiation of 650 nm monochromatic light.The results showed that the
I-V
behaviours and photostabilities were both improved obviously for multilayer L-B films modified electrodes.The increases of the rate of photoinduced charge transfer mediated by ferrocenyl-n-octadecanoale L-B films at CdSe/Fe(CN)
6
4+
solution interface were discussed in terms of schematic energetics.
INFLUENCE ON SUPERSENSITIZATION FOR GEOMETRIC POSITION OF SUPERSENSITIZER
TIAN HE, ZHU ZHENG-HUA, WANG SU-E
1990, 8(4): 248-253. DOI:
10.7517/j.issn.1674-0475.1990.04.248
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The supersensitization of the supersensitizing systems based on AgBr single-crystal has been studied by means of the Dember effect.It can be considered that the role of supersensitizers can be correlated directly with their measured Dember effects.The electronic energy levels and geometric position of supersensitizer relative to those of AgBr and sensitizing dyes and the diffusion direction of the free charge carriers have been discussed.The results of the experiments showed that supersensitization will be the most efficiant in the studied supersensitizing systems when the supersensitizer is in direct contact with silver bromide.
CHARGE TRANSFER AT MODIFIED CdSe THIN FILM ELECTRODE/FE(CN)
6
4-
SOLUTION INTERFACE
XIAO XU-RUI, LIN YUAN, SUN BI-ROU
1990, 8(4): 254-259. DOI:
10.7517/j.issn.1674-0475.1990.04.254
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Light-induced heterogeneous charge transfer processes of CdSe thin film electrodes modified with FcOCOC
17
H
35
L-B films were studied in Fe(CN)
6
4-
solution.Heterogeneous charge transfer rate constant
K
et
were determined and the possible rate limiting situation existed in photoelectrochemical processes were analysed.The results indicated that interfacial charge transfer may be the rate limiting step.A fast interfacial charge transfer processes based on selecting electro-active molecules for modification,and redox couples of solution are expected for improving in- the photoelectrochemical behavior of CdSe thin film electrodes.
STUDIES OF LIGHT-INDUCED CHARGE TRANSFER AT INTERFACE OF CuTSPc MOLECULAR FILMS AND p-Si(111) AND THE MECHANISM
LIU YANG-JING, ZHU ZI-QIANG, LIU WANG, YANG WEN-SHENG, LI TIE-JIN
1990, 8(4): 260-265. DOI:
10.7517/j.issn.1674-0475.1990.04.260
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In this paper,the CuTSPc supramolecnlar films,whose monolayer thickness is only 6Å and CuTSPc L-B films with C
18
Hpid chain spacer were modified on p-Si (111) by Langmuir-Blodgett technique.The surface photovoltage spectra of both film systems were measured for the first time.And it was found that the surface photovoltaic effect of the film systems was the greatest when there was only one monolayer of CuTSPc molecules on p-Si (lll).The experiments indicated that only the CuTSPc molecules within one monolayer adjacent to the semiconductor make a key role in the lightinduced interfacial charge transfer.Finally,the charge transfer process was proved to be a direct injection mechanism other than indirect injection one.
STUDY ON PORPHYRIN COMPOUNDS XIII. SYNTHESIS, STRUCTURE AND SPECTRAL PROPERTY OF P-AQ COMPOUNDS
HUANG SU-QIU, QIU XING-PING
1990, 8(4): 266-272. DOI:
10.7517/j.issn.1674-0475.1990.04.266
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Synthesis and fluorescence property of P-AQ compounds are reported in this paper.The influence of molecular structure and distance between P and AQ on the intramolecular electron transfer are discussed according to the spectroscopic data and extent of fluorescence quenching of the compounds.
SALT EFFECT IN ELECTRON TRANSFER PHOTOOXIDATION OF 1,4-DIPHENYL-1,3-BUTADIENE
WANG XIANG-DONG, ZHANG BAO-WEN, CAO YI
1990, 8(4): 273-278. DOI:
10.7517/j.issn.1674-0475.1990.04.273
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R4NBF4 effects were studied in 9,10-dicyanoanthracene sensitized photooxidation of 1,4-diphenyl-l,3-butadiene in CH
2
Cl
2
.Because of the association of the dipolar salts to form qua-drupoles which can react with exciplex giving radical ions,the photooxidation was accelerated by addition of R4NBF4 and the product distribution was changed.The usage of salt effect in mechanism study and synthesis were discussed.
A STUDY OF 9,10-DICYANOANTHRACENE PHOTOSENSITIZED SPLITTING WATER TO GENERATE MOLECULAR HYDROGEN
ZHANG BAO-WEN, ZHU YAN-NING, Wu QIAN-HONG, CAO YI
1990, 8(4): 279-283. DOI:
10.7517/j.issn.1674-0475.1990.04.279
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In this paper,the quantum yield of 9,10-dicyanoanthracene sensitized photoreduction of methyl viologen was measured.Amines,olefins and substituted benzenes were used as electron donor.Reaction conditions of splitting water to generate molecular hydrogen were discussed.The reaction was studied with toluene and p-xylene’as donors.A wide range of electron donor compounds can be used and some useful compounds may be synthesized simutaneously with hydrogen generation.
THE COMPETITIVE PHOTO-OXIDATION AT n-CdSc/Fe(CN)
6
4-/3-
PHOTOANODE AND THE INFLUENCES OF MODIFICATION BY L-B TECHNIQUE
LIU SHUN-LIN, QIAN DAO-SUN, SUN BI-ROU
1990, 8(4): 284-290. DOI:
10.7517/j.issn.1674-0475.1990.04.284
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The competitive oxidation reaction of hole between the reducing agent K
4
Fe(CN)
6
and n-CdSe photoanode was studied by RRDE.The results proved that the photogenerated holes are captured directly from the valence band.After modification of ferrocenylene-octadecanoate L-B films,the competitive oxidation effect of reducing agent is enhanced and the stabilization efficiency of the electrode was increased for about 20%.
DESENSITIZING EFFECT OF ISOMERIC METALLORGANIC PALLADIUM (Ⅱ) COMPOUNDS WITH THIOSEMICA-RBAZIDE ON THE DEVELOPMENT PROCESS OF SILVER HALIDE PHOTOGRAPHIC MATERIALS
O. V. MIKHAILOV, V. K. POLOVNYAK, V. K. KALENTYEV
1990, 8(4): 291-295. DOI:
10.7517/j.issn.1674-0475.1990.04.291
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Some chemical compounds can be used in the chemical photographic development process of silver halide panchromatic motion picture materials to decrease their sensitivity upon exposure whereby their development is possible at relatively bright illumination
[1]
.
1990, 8(4): 296-299. DOI:
10.7517/j.issn.1674-0475.1990.04.296
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1990, 8(4): 300-306. DOI:
10.7517/j.issn.1674-0475.1990.04.300
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PHOTOOXIDATIVE DEGRADATION OF PP-SBS BLEND
Hu Xing-zhou, Qi Ju-ying
1990, 8(4): 307-310. DOI:
10.7517/j.issn.1674-0475.1990.04.307
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The photooxidative degradation of blend of polypropylene and polystyrene-polybutadiene star block copolymer (PP-SBS) was studied by infrared spectroscopy.The experimental results showed that the rate of photooxidative degradation of PP-SBS is much higher than that of PP.It was also shown that the photooxidative degradation of PP-SBS starts from polybuta-diene component of SBS.
THE ELECTRON TRANSFER PHOTOOXYGENATION OF
α
-METHOXYNAPHTHALENE
Xu JIAN-HUA, SONG YI-LIN, Yu MA-JING
1990, 8(4): 311-315. DOI:
10.7517/j.issn.1674-0475.1990.04.311
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The 9,10-dicyanoanthracene (DCA) and chloranil (TCBQ) sensitized electron transfer photooxygenations of
α
-methoxy-naphthalene (
α
-MN) were studied.In both cases a complex mixture of products was obtained,of which the isolable components were 1,4-naphthoquinone and 4-methoxy-1,2-naphthoquinone.The reaction mechanism was discussed.In DCA sensetized reaction,superoxide ion O
2
-
and
3
O
2
were the species responsible for the oxygenation while the TCBQ sensitized reaction was a radical oxidation reaction involving
3
O
2
.Ground state charge transfer complex formation between TCBQ and
α
-MN was investigated.