摘要
采用溶胶 - 水热法合成了十二烷基苯磺酸钠(DBS)包覆的TiO2纳米粒子,并利用X射线衍射仪、透射电镜、表面光电压谱(SPS)和光致发光光谱(PL)等对样品进行表征.重点探讨了DBS包覆的适宜条件及DBS包覆对TiO2光伏和发光等性质的影响.结果表明,进釜前pH值在4.5～5.5, DBS用量为TiO2质量的1.0%～3.0%时,能够获得理想包覆.在水热过程中, DBS的引入对锐钛矿型TiO2微晶的生长有抑制作用.由于DBS的包覆,使TiO2的SPS和PL信号强度显著下降,这可能与磺酸基的吸电子性以及表面缺陷等的减少有关.
The TiO2 nanoparticles capped with sodium dodecylbenzenesulfonate （DBS） were synthesized by a solhydrothermal method, and were also characterized by XRD, TEM, Surface Photovoltage Spectroscopy （SPS） and Photoluminescence （PL）. The effects of capping DBS on photovohage and photoluminescence performances of TiO2 nanoparticle as well as appropriate capping conditions were principally investigated. The results show that the capping situation is desirable when the pH value and adding DBS amount are in the range of 4.5 -5.5 and 1.0% - 3.0% of TiO2 weight in advance of the hydrothermal process, respectively. The added DBS could inhibit the growth of anatase crystallite during the hydrothermal process. Moreover, the intensities of SPS and PL of TiO2 nanoparticle decreased after DBS was capped, which is possibly attributed to the electrophilic property of sulfonic acid group （ -SO3- ） as well as the decrease of surface defect. Key words TiO2, DBS, Surface capping, Surface photovoltage, Photoluminescence
基金
ProjectsupportedbytheNationalNatureScienceFoundationofChina(20431030
20301006)
theNatureScienceFoundationofHeilongjiangProvinceofChina(ZJG0404
B0305)
theScienceFoundationforExcellentYouthofHeilongjiangProvinceofChina(2002)
theSupportingPlanofEducationBureauofHeilongjiangProvince(1054G035)
thePostdoctoralScienceFoundationofChina(20040350168)andtheScienceFoundationforExcellentYouthofHeilongjiangUniversityofChina(2003).
关键词
TIO2
DBS
表面包覆
表面光伏
光致发光
TiO2, DBS, Surface capping, Surface photovoltage, Photoluminescence
