CdS量子点敏化纳米TiO_2异质薄膜的制备和表征

以异丙醇钛(C12H28O4Ti)为主要原料合成氧化钛(TiO2)前驱体溶胶,并结合230℃水热处理得到TiO2溶胶,利用电流体动力学(EHD)技术在掺氟氧化锡导电(FTO)玻璃基片上镀膜,450℃高温煅烧制备具有多级结构锐钛矿TiO2纳米薄膜。以硝酸镉(Cd(NO3)2)及硫化钠(Na2S)分别为镉源和硫源,采用化学浴沉积技术在TiO2薄膜上沉积制备了量子点敏化的异质薄膜。采用X射线衍射(XRD)、电子扫描电镜(SEM)、电子透射电镜(TEM)以及紫外-可见吸收光谱(UV-Vis absorbance spectra)对薄膜结构和性能进行表征。结果表明,纳米TiO2薄膜具有亚微米球簇堆积结构,球簇之间形成尺寸连续分布的微纳通道,便于溶液的浸润和离子的表面吸附。敏化制备异质薄膜中硫化镉以量子点状态存在,晶粒尺寸为3～5nm范围内。UV-Vis吸收光谱证实量子点的量子限域效应,吸收发生蓝移现象。     

纳米Ag2S/TiO2异质复合薄膜的制备和光电性能

以异丙醇钛(C12H28O4Ti)为主要原料合成氧化钛(TiO2)前驱体溶胶,并结合230℃水热处理得到TiO2溶胶,利用电流体动力学(EHD)技术在掺氟氧化锡导电(FTO)玻璃基片上镀膜,450℃高温煅烧制备具有多级结构锐钛矿TiO2纳米薄膜.以硝酸银(AgNO3)及硫化钠(Na2S)分别为银源和硫源,采用化学浴沉积...     

Y2O3:Yb,Er纳米材料的制备及上转换发光研究

利用柠檬酸络合溶胶-凝胶(Sol-gel)法制备Y2o3:Yb,Er纳米上转换材料.通过改变掺杂元素Yb,Er的比例和焙烧温度,在980nm的红外光激发下,观察研究氧化物颗粒的发光性质.通过研究可知,该粉体在980nm半导体激光器激发下发出绿色和红色的上转换荧光,分别对应于Er3+离子2H11/2→4I15/2,4S3/2→4I15/2和4F9/2→4I15/2的跃迁.     

Surface plasmon resonance sensor based on molecularly imprinted films for the detection of pentaerythritol tetranitrate (PETN)

A novel surface plasmon resonance(SPR)sensor based on molecularly imprinted films(MIFs)was developed for the detection of pentaerythritol tetranitrate(PETN).In this work,the thin MIFs were formed on a gold sensor chip through thermal co-polymerization of functional monomers(methacrylic acid,MAA)and crosslinking monomers(ethylene glycol dimethacrylate,EGDMA)in the presence of template molecules PETN.The template molecules PETN were subsequently removed from the MIFs simply by rinsing the MIFs with a mixture of acetonitrile and acetic acid 9∶1(v/v),thus the recognition sites were formed for specific detection of PETN.According to the mass coverage equation,the surface coverage of removed PETN from MIFs was about 10.8 ng/mm2.The developed SPR sensor allowed for the detection of PETN at concentration down to 10-10 mol/L.A control experiment utilizing an analogue cyclotrimethylenetrinitramine(RDX)showed MIFs' good selectivity to PETN.     

一种新型高性能便携式单轴SPR检测仪研制

为满足环境监测等多种场合的检测需要,项目小组设计一种新型便携式表面等离子体共振(surface Plasmon Resonance,SPR)检测仪。本设计改进传统便携式SPR检测器使用的轴传动装置,具有体积小、成本低、扫描角度范围广、检验准确度高的特点。