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Table of Content
23 March 2006, Volume 24 Issue 2
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Synthesis and Photophysical Studies of Platinum(Ⅱ) Polypyridine Complexes by Ancillary Urea Acetylide Ligand
PAN Dun, WU Li-zhu, WU Xiao-ling, ZHANG Li-ping, TUNG Chen-ho(TONG Zhen-he)
2006, 24(2): 81-86. DOI:
10.7517/j.issn.1674-0475.2006.02.81
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4’-tolyl-cyclometalated platinum(Ⅱ) complex with urea acetylide as an ancillary ligand(P2) has been synthesized,and its photophysical properties have been investigated.It is noted that P2 tends to aggregate under relative low concentration in nonpolar solvent.
Preparation of Polycrystalline Silicon Films by Aluminum-Induced Crystallization at Low Temperature
XIA Dong-lin, YANG Sheng, XU Man, ZHAO Xiu-jian
2006, 24(2): 87-92. DOI:
10.7517/j.issn.1674-0475.2006.02.87
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Polycrystalline silicon films were fabricated by aluminum-induced crystallization.These films are prepared by plasma-enhanced chemical vapor deposition technology from hydrogen-diluted SiH
4
and B
2
H
6
.The effect of thickness of aluminum films on the microstructure and morphology were investigated.The results were analyzed by XRD,RAMAN and SEM.The thickness of aluminum film was found to play a critical role in the extent of crystallization of a-Si thin film.The experiment indicate that a-Si thin films with thickness of aluminum films for sputtering time 10 s were amorphous structure after annealing 450 ℃ for 20 min,a-Si films with thickness of aluminum film for sputtering time 20 s began to crystallize after annealing at 450 ℃ for 20 min,and the crystallinity of a-Si thin films was enhanced obviously with increment of thickness of aluminum films.
Effects of Gelatin on Phase Transformation and Photocatalytic Activity of Nano-size Titanium Dioxide
TIAN Bao-zhu, TONG Tian-zhong, CHEN Feng, ZHANG Jin-long
2006, 24(2): 93-101. DOI:
10.7517/j.issn.1674-0475.2006.02.93
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Nanocrystalline TiO
2
powders were prepared with gelatin dispersants by sol-gel method.The effects of gelatin on phase transformation and average particle sizes of nanocrystalline TiO
2
during calcination were investigated by the means of XRD,TG-DTA,AFM,and N
2
adsorption-desorption.Moreover,the effects of gelatin dosage on photocatalytic activity of samples were evaluated from an analysis of the photodegradation of methyl orange.The experimental results indicate that the gelatin has effects of inhibiting phase transformation from amorphism to anatase and decreasing the anatase-to-rutile transformation temperature,and the average particle size of nanocrystalline TiO
2
decreases with increasing the gelatin dosage.The photocatalytic activity of samples calcined at 600 ℃ increases with increasing gelatin dosage.As for samples calcined at 800 ℃,the highest photocatalytic activity was obtained when m
G
:m
TBOT
(mass ratio of gelatin to tetrabutyl titanate)=(1:8.)
An Experimental Study on the Production Efficiency of Hydroxyl Radicals by Several Photocatalysis Reaction Systems
WU Shao-lin, XIE Si-cai, YANG Li, DAI Yu-fen, ZHONG Yu-feng
2006, 24(2): 102-109. DOI:
10.7517/j.issn.1674-0475.2006.02.102
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By using a Phenanthroline Hydrate-Fe(Ⅱ)(salmon pink) Spectro-measurement to dictate the production efficiency of the hydroxyl radicals by the Fenton,UV/Fenton,UV/Fe(Ⅲ)-Oxalate/ H
2
O
2
,UV/TiO
2
under the different conditions,analyzed the mechanism reaction of different major factors.The results show that the optimal reaction conditions were pH=4.0,m(H
2
O
2
)/m(Fe)=1/25,and quality concentration of iron about 25 mg/L for the Fenton、UV/Fenton、UV/Fe(Ⅲ)-Oxalate/H
2
O
2
.The production efficiency of the hydroxyl radicals by UV/TiO
2
was smaller changed with the change of the environmental pH relative Fenton、UV/Fenton、UV/Fe(Ⅲ)-Oxalate/H
2
O
2
,but the production efficiency of the hydroxyl radicals by UV/TiO
2
was the lowest and UV/Fe(Ⅲ)-Oxalate/H
2
O
2
was the best among the four mechanism reaction systems.
The Study of Aggregation Properties of Sodium Guerbet Tetradecyl Polyoxyethylene Ether Carboxylate by Steady-State Fluorescence
ZHU Rong-xian, JING Zhi-qiang, ZHANG Lu, ZHAO Sui, YU Jia-yong
2006, 24(2): 110-117. DOI:
10.7517/j.issn.1674-0475.2006.02.110
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Critical micelle concentration(CMC) and micelle aggregation number(
N
) of the four branched surfactants sodium Guerbet tetradecyl polyoxyethylene ether carboxylate were determined by steady-state fluorescence probe method in which pyrene was used as fluorescence probe and benzophenone as quencher.The results showed that the CMC of this kind of surfactants can be determined by steady-state fluorescence probe,which fairly approached to that determined by surface tension method.Critical micelle concentration(CMC) and micelle aggregation number(
N
) decreased with the increasing of number of ether oxide units for all four surfactants,while the micropolarity of the micelles was less sensitive to the increasing of number of ethylene oxide units.
Spectra of in Situ Reduction of Au(Ⅲ) by Phycocyanin and Dynamic Formation of Au(0)
YANG Fang, GUO Zhen-jiang, BAI Yan, HUANG Zhi, ZHENG Wen-jie
2006, 24(2): 118-125. DOI:
10.7517/j.issn.1674-0475.2006.02.118
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The interaction of Au(Ⅲ) with Phycocyanin(PC) was investigated by ultraviolet-visible,fluorescence and infrared spectra under the condition of 4 ℃ and without light.The results showed that the characteristic absorption of PC at 615 nm decreased gradually with the increase of Au(Ⅲ) concentration and interaction time.Accordingly,its fluorescence emission peak and two fluorescence excitation peaks also decreased.It was also observed by TEM that nano-Au(0) was formed by the PC in situ reduction.The diameter of Au(0) was about 20 nm,which was round,highly dispersed and stable in PC.
The Research of the Luminescence Film of Y
2
O
3
:Eu Preparated by Method of Electrodeposition-Sinter
ZENG Dong-ming, SHU Wan-gen, SHI Fei-fei
2006, 24(2): 126-132. DOI:
10.7517/j.issn.1674-0475.2006.02.126
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The flat panel display is the development direction of display technology.Filming luminescence material possess important position in display technology.In this paper,electrochemical deposition of red luminescent Y
2
O
3
:Eu thin films on transparent conducting optically(ITO) glass substrates by cathodic reduction of yttrium nitric has been investigated.Y(OH)
3
deposits were obtained using a conventional three electrode cell that potential of work electrode was -1.2 V vs.Ag/AgCl electrode for 400 s in a 0.1 mol/L Y(NO)
3
,with 4%(mol/mol) Eu(NO)
3
,temperature 65 ℃.Then the glass coated Y(OH)
3
containing Eu sintered for 2 h at 500 ℃.The luminescence spectrum of film preparated by this method was similar compared with that of the powder preparated by solid methed.XRD confirms the formation of Y
2
O
3
and SEM reveal uniformity of film.
Synthesis and Photo-Luminescent Properties of 2,6-Di(4’-bisphenylaminostilbenyl)benzo[1-2,4-5]bisoxazole
ZHANG Tian-lin, MA Juan-juan, XIONG Jian-jun
2006, 24(2): 133-139. DOI:
10.7517/j.issn.1674-0475.2006.02.133
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A novel compound 2,6-di(4’-bisphenylaminostilbenyl)benzo[1-2,4-5]bisoxazole have been designed and synthesized with triphenylamino aldehyde and 2,6-bis(4-chloromethyl phenylene)benzo [1-2,4-5]dioxazole through Wittig-Horner reaction,that simultaneously taking triphenylamino as a hole transporting unit and benzobisoxazole as an electron transporting unit into the stilbene can evidently enhanced its light-emitting and light quantum efficiency.Its chemical structure has been determined by UV-Vis,IR,
1
HNMR and EA,and photo-luminescent properties have also been researched.The results indicated that the synthesized compound has trans-stilbene structural character and can be used as small molecular blue light-emitting material.
A Review of Photothermographic Materials
FAN Ming-ming, ZOU Jing, WANG Hong
2006, 24(2): 140-151. DOI:
10.7517/j.issn.1674-0475.2006.02.140
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Photothermographic materials(PTG),one of frontier subjects in the international photographic science during the last decade,have been summarized.Silver carboxylates,silver halide,toners,antifoggants,stabilizers,sensitizers,binders and other ingredients of PTG materials are introduced,and the imaging theories for PTG materials are reviewed.
Research on Photographic and Anti-Aging Properties of a Novel Development Accelerator
LIU Yu-ting, YIN Da-wei, LÜ Feng, ZOU Jing, ZHANG Dade, YAO Zu-guang
2006, 24(2): 152-156. DOI:
10.7517/j.issn.1674-0475.2006.02.152
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A novel development accelerator’s photographic properties and anti-aging properties were researched in this paper.Photographic properties’ result of this development accelerator(M) indicated that M could increased photosensitivity significantly and at the same time had good anti-aging properties,whereas did not change the absorption spectra of the main coupler development.
