Table of Content

23 March 2010, Volume 28 Issue 2

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The Mechanism of Phthalazine on Photothermographic Materials Based on Silver Benzotriazole

SHI Yao

2010, 28(2):  81-86.  DOI: 10.7517/j.issn.1674-0475.2010.02.81

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The mechanism of phthalazine(PHZ) on photothermographic materials based on silver benzotriazole had been studied.The results from SEM(scanning electronic microscope),IR and XRD indicated that a silver complex,which was supposed to be easy to transmit silver ions to development center to promote development,have been formed by introducing PHZ into the silver benzotriazole materials.The sharp of silver benzotriazole grains were changed by the silver complexes which were the same crystal structures as silver benzotriazole.

The Influence of Ag(PHZ)NO₃ on the Thermal Development Performances of Photothermographic Material

ZHANG Zhan-jiang, LI Jin-pei

2010, 28(2):  87-94.  DOI: 10.7517/j.issn.1674-0475.2010.02.87

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In order to investigate the role of phthalazine(PHZ) in the thermal development of photothermographic(PTG)material,silver complex[Ag(PHZ)NO₃] was synthesized by the reaction of silver nitrate and phthalazine,and the SEM image showed that the compound was prismatic crystal.The influence of Ag(PHZ)NO₃ on the thermal development performances of PTG Material was studied.The results showed that,compared with phthalazine,Ag(PHZ)NO₃ lowered the developed silver density and the haze in the same development conditions,whereas the morphology and the size of the developed silver was not changed obviously.How does Ag(PHZ)NO₃ influence the thermal development was discussed.

Effects of UV Light Irradiation on Conductive and Transmittance Properties of AZO Films

ZHANG Tian-bao, LI Jin-pei

2010, 28(2):  95-103.  DOI: 10.7517/j.issn.1674-0475.2010.02.95

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Transparent conducting aluminum-doped zinc oxide(AZO) thin films were prepared by the UV light-assisted sol-gel method in this paper.The effects of UV light irradiation on conductive and transmittance properties of the AZO films were further studied.It is demonstrated that the conductivity of the AZO films is increased markedly by UV light irradiation,and the ratio of sheet resistance before and after irradiation increases with decreasing the microcrystal size in the film.Further more,the UV absorption edge shifts towards shorter wavelength and the NIR transmission decreases with prolonging the UV irradiation.These experimental phenomena are attributed to the surface oxygen desorption which lead to the increase in the carrier concentration and in mobility of carriers and the layer-annealing structure of the AZO film.

Study of Optical Waveguide Sensing Element for Nitrogen Dioxide Detection

MAMUT Mariya, MAHMUT Mamtimin, MAHMUT Melikizat, YIMIT Abliz, RAHMAN Adalet

2010, 28(2):  104-110.  DOI: 10.7517/j.issn.1674-0475.2010.02.104

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An optical waveguide sensing element was prepared by spin coating a thin film of copper phthalocyanine(CuPc) onto the surface of K⁺-ion exchanged optical waveguide which was prepared by hot ion-exchanged method,and nitrogen dioxide was detected successfully using this sensing element in optical waveguide gas sensor system.The experimental results showed that this sensing element has reversible response to nitrogen dioxide gas with highly sensitivity and good reproducibility.

Inherent Photoluminescence Properties of PAMAM Dendrimers and Application in Fingerprint Detection

JIN Yu-juan, LUO Yun-jun, LI Guo-ping, LI Jie, LU Wen-ting

2010, 28(2):  111-120.  DOI: 10.7517/j.issn.1674-0475.2010.02.111

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A strong fluorescence emission from poly(amido amine)(PAMAM) dendrimers with different terminal groups(amine-terminated and carboxylate-terminated) was studied under different conditions by varing experimental parameters such as temperature,concentration and pH value.The intrinsic fluorescence of PAMAM dendrimer is due to an n→π^* transition from the amido groups throughout the dendritic structure and the close spherical structure of PAMAM.The fluorescence intensity increased fast at lower pH or lower temperature,linear with respect to dendrimer concentration when the dendrimer solution is dilute but depart from the linear relationship at higher concentration and higher dendrimer generations.The mechanism was studied carefully.First,it was reasonable that photoinduced electron transfer(PET) between fluorescence-emitting moiety and tertiary amine groups was prevented,or even eliminated when tertiary amine groups were protonated with H⁺ protons at lower pH,thus fluorescence intensity increased sharply accordingly.Also,the deactivation of luminescence was raised with increasing temperature.Further more,a critical concentration existed over which fluorescence intensity did not increased with linear relationship with increasing concentration because of concentration extinction effects.Oil latent fingerprints deposited on tinfoil surface treated with dendrimer solution emitted blue photoluminescence under ultraviolet excitation of 365 nm from an UV LED in the dark.Fingerprint was successfully detected with good resolving rate.

Study on the Aggregation Behaviors of Composite Emulsifiers By Steady-state Fluorescence

GAN Meng-yu, LIU Yan, MA Li, HAO Shao-na, LI Zhi-chun

2010, 28(2):  121-130.  DOI: 10.7517/j.issn.1674-0475.2010.02.121

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The critical micelle concentration(CMC) of sodium dodecyl sulphonate(AS) and polyoxyethylene nonyl phenol ethers(Oπ-10)composite emulsifier was detected and compared with the CMC of AS and Oπ-10 respectively by fluorescence probe technique according to the ratio of fluorescence intensity corresponding to first vibronic peak(I₁,λ=373 nm) and third vibronic peak(I₃,λ=384 nm) of pyrene(I₁/I₃)which varied with the emulsifier concentration.The results showed that the CMC of composite emulsifiers was between the CMC of AS and Oπ-10.The aggregation numbers of micelle with different ratios of composite emulsifiers were detected by steady-state fluorescence probe method in which Benzophenone was used as quencher,the experimental results showed that the aggregation number increased linearly with the increase of concentration of composite emulsifiers in the range of 4—9 times of CMC,and the aggregation number increased with the raise of the ratio of the Oπ-10 in composite emulsifiers.The effect of Composite Emulsifiers’ aggregation behaviors on the polymerization of organosilion-acrylate core-shell emulsion was discussed according to the I₁/I₃ values of pyrene.

Synthesis of Ketonpiprazine from N-phthalimido Dipeptides by Photoinduced Single Electron Transfer

TAN Guang-hui, WEI Shu-quan, ZHAO Jun-ming, ZHANG Peng, WANG Bing-nan, ZHENG Peng, LIU Yan, JIN Ying-xue

2010, 28(2):  131-136.  DOI: 10.7517/j.issn.1674-0475.2010.02.131

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Biradical(5) were formed by photoinduced single electron transfer of N-phthalimido dipeptide(1) under irradiation.The biradical(5) could couple intramolecularly to form cycloproduct(2) containing ketonpiprazine moiety.This good yield reaction could be used as a new synthesis method for ketonpiperazine analogous.The structures of all the new compounds were characterized by MS and NMR spectra.

Synthesis and Photovoltaic Performances of Dye-sensitized Solar Cells Based on Novel NIR Dyes Containing Multi-cyano Acceptor

HE Li, LIU Bo, CHEN Yu, ZHU Wei-hong

2010, 28(2):  137-146.  DOI: 10.7517/j.issn.1674-0475.2010.02.137

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A series of novel NIR dyes 5C-1,5C-2 and 5C-3 containing triphenylamine,dimethylphenylamine and indoline unit as electron donors were synthesized and characterized.Their photophysical and electrochemical properties were studied in detail.All of three dyes have strong absorption in visible and NIR region from 550 to 850 nm.While adsorbed on TiO₂,absorption peaks become broadened with red-shift in their absorption edges,which are favored to capture light in NIR region.However,LUMO levels of these NIR dyes are above-0.1 V vs NHE,incapable of matching the conduction band of TiO₂(-0.5 V vs NHE).Therefore,SnO₂ was utilized as anodic semiconductor materials instead of TiO₂.The short-circuit current density was sharply increased,indicating that using a suitable semiconductor material could improve light-generated current effectively.The photovoltaic performance of DSSCs based on three dyes could be further improved after optimizing the semiconductor materials and the electrolyte.

Some Problems on the Organic Semi-conductor Hetero-junction

WU Shi-kang, WANG Peng-fei

2010, 28(2):  147-158.  DOI: 10.7517/j.issn.1674-0475.2010.02.147

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Organic semi-conductor hetero-junction plays very important role in the organic electronic device.It may not only control the movement of charge carries,but also have huge influence on the fundamental processes such as the electron transfer and energy transfer in the functional electronic devices.The energy relationship between different layers has been discussed compendiously,and some problems concerned with the surface energy relationship of hetero-junction have also been discussed.It should be interesting for the design and manipulation of organic electronic devices.