IMAGING SCIENCE AND PHOTOCHEMISTRY

Synthesis of 2,3-Dihydrofuran Derivatives by Et₃N·Mo(CO)₅ Catalyst

CHEN Yu-zhe, WU Li-zhu, ZHANG Li-ping, TONG Zhen-he(TUNG Chen-ho)

2006, 24(5): 321-324. DOI: 10.7517/j.issn.1674-0475.2006.05.321

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2-Pentyl-,2-(p-methyl-phenyl)-,and 2-methyl-2-phenyl-2,3-dihydrofurans were successfully prepared by using Et₃N·Mo(CO)₅ catalyst.The condition of the reaction is mild,the work-up is simple.This method can be applied to the synthesis of a large number of endocyclic enol ethers.

Structure of Counter Electrode in Dye-Sensitized Nano Crystal TiO₂ Solar Cells

JIANG Chun-hua, HU Yu-ning, WAN Fa-rong, LONG Yi

2006, 24(5): 325-334. DOI: 10.7517/j.issn.1674-0475.2006.05.325

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This paper provides a new type of counter electrode in the dye-sensitized nano crystal TiO₂ solar cells.The counter electrode is designed with storage pond and injection channel for liquid electrolyte.By this counter electrode it is able to avoid the failure of the solar cell which may occur due to the leakage of liquid electrode.

A New Red-Emitting Phosphor—Ca₄GdO(BO₃)₃:Eu³⁺

WU Yun-kai, WANG Hu, GU Zhi-hong, QIAN Jia-sheng

2006, 24(5): 335-342. DOI: 10.7517/j.issn.1674-0475.2006.05.335

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A new red-emitting phosphor,Ca₄GdO(BO₃)₃:Eu³⁺,was prepared by the solid-state reaction technique at high temperature and its luminescent properties were investigated.The results show that this phosphor emitted bright red light whether under X-ray,UV or VUV excitation.It has great potential for being explored as a new red-emitting phosphor because it can be easily excited by 254 nm,172 nm and X-ray light and emit bright red light.Its dominant emission peak is located at 610 nm and all other emission lines are very weak.It is observed that there is an energy transfer process between the Gd³⁺ ion and activator(Eu³⁺ ion) and one possible way of energy transfer is connected with the secondary absorption,namley cascade exiction.

Sensitization of Formate Dopant to Cubic and {100} Tabular Silver Chloride Microcrystals

LI Zhi, ZHENG Tong, SHI Jing-jing, WANG Ying, PENG Bi-xian, CHEN Li-juan

2006, 24(5): 343-350. DOI: 10.7517/j.issn.1674-0475.2006.05.343

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Silver chloride cubic emulsions and {100} T-grain emulsions doped by formate on different positions of microcrystal were prepared. As a hole-traping dopant,formate can enhance the photographic sensitivity of the emulsions as high as 3—8 times without an increase in fog density.It was noted that the photosensitivity of the emulsions homogeneously doped by formate was higher than that of the emulsions doped only on surfaces.Synergetic sensitizing effects of the doped formate and sulfur or sulfur-plus-gold or spectral sensitization were observed in every doped emulsion,which can improve the sensitometric characteristics of the emulsion further.

Photopolymerization of 1,6-Hexanediol Diacrylate Using Benzophenone/Polymerizable Amine as Initiator System

LI Shu-juan, HE Yong, WU Gang-qiang, NIE Jun

2006, 24(5): 351-359. DOI: 10.7517/j.issn.1674-0475.2006.05.351

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Three polymerizable amines,EGDPM,DMPDA,EGMPM,were used as coinitiators for benzophenon photoinitaitor system.Their primary photochemistry process and photoinitiation kinetics in 1,6-Hexanediol Diacrylate system were investigated with UV-Vis spectroscopy and Photo-DSC.The result indicated that polymerizable amines type and their concentration played an important role on kinetics of photopolymerization rate and monomer conversation due to their primary photochemistry process properties.And increasing light intensity and temperature could lead to the increase of photopolymerization rate and the final conversion.

Preparation and Optical Properties of Ag/Pt Bimetallic Hollow Nanoparticles

GAO Ji-ning, REN Xiang-ling, TANG Fang-qiong

2006, 24(5): 360-365. DOI: 10.7517/j.issn.1674-0475.2006.05.360

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Bimatallic Ag/Pt nanoparticles were prepared based on Ag nanoparticle-mediated replacement and deposition reactions.The morphology,size,and structure of the bimetallic nanoparticles were characterized by transmission electron microscopy;it was found that these nanoparticles are bearing hollow interiors.The UV-Vis absorption spectra show the characteristic of single plasmon resonance absorption band and the peak initially red shift and then blue shift with increasing the molar ratio of H₂PtCl₆ to AgNO₃ in the reacting solution.Surface enhanced Raman spectroscopy results show that these nanoparticles remain SERS active when pyridine was used as adsorbate probe.

Photocatalytic Redox Performance of Copper Modified TiO₂ Coupling with SnO₂

WU Shu-xin, YIN Yan-hua, MA Zhi, QIN Yong-ning

2006, 24(5): 366-376. DOI: 10.7517/j.issn.1674-0475.2006.05.366

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TiO₂ coupling with SnO₂ was modified by impregnation method with aqueous solution of Cu(NO₃)₂ under ultrasonic irradiation,followed by calcinations at 450 ℃.The photocatalytic activity of the catalysts was evaluated using the reaction of photocatalytic oxidation of acetic acid as well as formaldehyde,and photocatalytic reduction of CO₂.The results show that the photocatalytic activity of TiO₂ can be improved either by copper modified or coupling with SnO₂.One of the two improvement methods is enhanced by the other.The catalysts were characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS) and transmission electron microscopy(TEM).The mechanism for the improvement of CuO_x-SnO₂/TiO₂ state was discussed and the possible route of photocatalytic reduction of CO₂ was proposed.

Studies on a Novel Deep UV Positive Photoresist Material

CHU Zhan-xing, CHENG Long, WANG Wen-jun, WANG Li-yuan

2006, 24(5): 377-381. DOI: 10.7517/j.issn.1674-0475.2006.05.377

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Acrylpimaric acid,a diacid with alicyclic structure and good film-forming property,was prepared by the Diels-Alder reaction of abietic acid and acrylic acid.The diacid could react with divinyl ether,such as 1,3-divinyloxyethoxybenzene,in solid film when baked above 80℃ and the film became insoluble in dilute base aqueous.Thus formed compound can be quickly decomposed at the presence of strong acid generated by photoacid generator(PAG) above 100℃ and become easily soluble in dilute aqueous base.A positive photoresist could be formed by the diacid,divinyl ether and PAG.The measured photosensitivity is less than 30 mJ/cm² when exposed to low pressure Hg lamp(254 nm).

Research on Semiconductor Quantum Dots for Biological Imaging

YU Qi-yu, LIU Chun-yan

2006, 24(5): 382-390. DOI: 10.7517/j.issn.1674-0475.2006.05.382

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The unique optical properties of semiconductor quantum dots(QDs) make them very promising as fluorescent probes in biomedical application.We review current approaches to the synthesis,surface modification and bioconjugation of QDs,as well as their advantages over traditional organic dyes in biological imaging.

Photophysical Properties and DNA Photodamage Abilities of the Aryl-modified Ru(II) Bis(terpyri-dine) Complexes

DING Hui-ying, ZHANG Bao-wen, WANG Xue-song

2006, 24(5): 391-391. DOI: 10.7517/j.issn.1674-0475.2006.05.391

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Design and Synthesis of Novel Red-Emitting Materials and Their Applications in Organic Light-Emitting Diodes

YAO Yi-shan, WANG Xue-song, ZHANG Bao-wen

2006, 24(5): 392-393. DOI: 10.7517/j.issn.1674-0475.2006.05.392

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