摘要:
通过简单的溶剂热法,在不添加任何表面活性剂的情况下,系统地研究吡啶、甘露醇、聚乙二醇和乙二醇四种溶剂对Bi2WO6辐射防护材料的影响.并利用XRD,SEM,TEM,HRTEM和DRS等分析技术对Bi2WO6晶体的组成、形貌、比表面积和禁带宽度等进行了表征.实验结果表明,溶剂对防护材料的形貌、光致发光性能和辐射防护性能有较大影响.选用吡啶作为溶剂,有利于材料形成不规则纳米球,提高其结晶度、光致发光强度及γ射线屏蔽率.该形貌下PS/Bi2WO6材料对155Eu和22Na混合点源的105.310 keV的γ射线屏蔽率达54.17％,已高于传统防护材料PbWO4.
关键词:
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γ射线防护
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钨酸铋
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溶剂
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形貌
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光致发光
Abstract:
Bismuth tungstate (Bi2WO6) shielding material was prepared by a simple solvothermal method without any surfactants and the effects of pyridine,mannitol,polyethylene glycol,ethylene glycol on it were systematically researched.The crystalline phase,compositions,morphology,surface area and band gap energy of the Bi2WO6 were characterized by X-ray diffraction,scanning electron microscopy,transmission electron microscopy and high resolution transmission electron microscopy absorption spectra.It was found that the solvent had a significant influence on the morphology,photoluminescence properties and radiation shielding properties of the samples.The solvent pyridine enhanced the crystallinity,photoluminescence intensity and γ-ray shielding properties.PS/Bi2WO6 of irregular nanosphere exhibited γ-ray shielding rate of 54.17％ at a mixed 155Eu and 22 Na point source of 105.310 keV,which was much higher than that of conventional shielding materials like PbWO4.
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