| The compound of sulfur group is of special physical and chemical properties and itplays implacable importance on muchu high-tech field such as semiconductormaterial,solid chemistry,electromagnetism,optical performance ,especially multirare-and-scattered-elements selenide.It has been on the highlight for resent tenyears.Therefore,this study is to develop new-style mutilfunctional , mutil-selenium andmulti-lanthanum nanosized crystal.It can enrich the RSE chemical theory,enlargecontent of inorganic chemistry,enhance research level on the basis of resourceadvantage in fertile elements of our country.Therefore,it is employed with importanttheoretic meaning and latent application. This paper used microwave solvothermaltechnique to prepare four nanosized crystal and it have not been reported in theliterature as yet.This article introduced microwave solvothermal technique to prepare four mutil-selenium nanosized crystal Tl8SnSe6,AgLa3Se5,Ag2SnSe3 and CuLa3Se5 ,respectively.Atthe same time, their composition and structure were confirmed.This work observed andconfimed the effect of every condition ,for example microwave oven's heating time,ultrasonic time on reaction.Several technique including EDS,XRD,TEM,XPS andchemical analysis was used to characterize these compound prepared on optimalconditions on phase, purity, granularity, value state and component. Besides, band gap,thermal stability , fluorescence and photocatalysis were measured . Their band gaps arein the range of 2.0～3.0 ev. They have good irradiance capability.And they can existstably even above 600℃.The photocatalytsis research indicated that they have gooddegrading function for Methyl Orange, its decoloration rate can arrive at 90%.Besides, the mechanism of synthesizing multi-selenium nanosized crystal bymicrowave solvothermal technique is discussed.The function of ultrasonicwave,microwave and organic solvent during the formation of products andsemiconductor property of products are theoretically explained. |
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