摘要
利用表面活性剂双层修饰技术在水溶性荧光CdTe纳米晶表面先后包覆了双十八烷基二甲基溴化铵和十二烷基硫酸钠,从而在纳米晶外表面引入—SO4-反应位点,以—SO4-为活性中心进一步制备了包覆CdTe纳米晶的BaSO4复合荧光微球.通过扫描电子显微镜、透射电子显微镜、共聚焦荧光显微镜和X射线粉末衍射等方法确定了复合微球的尺寸及组成.由于BaSO4的保护,CdTe-BaSO4复合微球荧光的耐酸性比CdTe原液的提高明显.
On the basis of the technique of surfactant bilayer modification,aqueous luminescent CdTe nanocrystals（NCs）were modified with DODAB layer and SDS layer.Due to the introduction of SO-4 sites on NC surface from SDS layer,NCs were further incorporated into BaSO4 composite microspheres through the stepwise addition of Ba2＋ and SO2-4.The size and the composition of microspheres were characterized via SEM,TEM,confocal fluorescence microscope and XRD.Owning to the protection of BaSO4,the photoluminescence of as-prepared BaSO4-CdTe microspheres were more antacid than the original aqueous CdTe NCs.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第12期2563-2568,共6页
Chemical Journal of Chinese Universities
基金
国家'九七三'计划(批准号:2007CB936402)
高等学校全国优秀博士学位论文作者专项资金(批准号:200734)
国家自然科学基金(批准号:20704014)
吉林省青年科研基金(批准号:20080101)资助
关键词
纳米晶
表面修饰
硫酸钡
复合微球
Nanocrystal
Surface modification
Barium sulfate
Composite sphere
