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SPV and PL Performances of TiO2 Nanoparticles Capped with DBS
Wang Baiqi1, Jing Liqiang*2, Qu Yichun2, Sun Zhihua2, Xue Lianpeng2, Ji Shaojing2, Fu Honggang1,2
1.Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001;2.School of Chemistry and Material Sciences, the Key Laboratory of Physical Chemistry, Heilongjiang University, Harbin 150080
Abstract:
The TiO2 nanoparticles capped with sodium dodecylbenzenesulfonate (DBS) were synthesized by a sol-hydrothermal method, and were also characterized by XRD, TEM, Surface Photovoltage Spectroscopy (SPS) and Photoluminescence (PL). The effects of capping DBS on photovoltage 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
FundProject:
DBS包覆TiO2纳米粒子的表面光伏及光致发光性能
王百齐1, 井立强*2, 屈宜春2, 孙志华2, 薛连鹏2, 姬少靓2, 付宏刚1,2
1.哈尔滨工业大学应用化学系,哈尔滨,150001;2.黑龙江大学化学化工与材料学院,物理化学重点实验室,哈尔滨,150080
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.
关键词:  TiO2  DBS  表面包覆  表面光伏  光致发光
DOI:10.1088/1674-0068/18/5/807-811
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