电化学原子层沉积研究现状及沉积体系的构建

近年来,电化学原子层沉积(Electrochemical atomic layer deposition,E-ALD)技术在制备催化、光电及热电等功能薄膜的研究和应用方面取得了较大进展.概述了E-ALD的发展历史、沉积原理、研究及应用情况,介绍了课题组研发的E-ALD系统的构成和生长过程的控制机理.     

Sn掺杂In_3O_2半导体薄膜的制备及其性能研究

采用磁控溅射方法在玻璃基底上制备了Sn掺杂In3O2(In3O2:Sn)半导体薄膜,通过XRD、XPS、四探针仪和分光光度计等测试表征,研究了生长速率对薄膜结构和光电性能的影响.结果表明:所制备的薄膜均具为(222)择优取向的立方锰铁矿结构,其结构参数和光电性能明显受到生长速率的影响.当生长速率为4 nm/min时,In3O2:Sn薄膜具有最大的晶粒尺寸(32.5 nm)、最高的可见光区平均透过率(86.4%)和最大的优值因子(7.9×104Ω-1·m-1),其光电性能最好.同时采用Tauc公式计算了样品的光学带隙,结果表明:光学带隙随着生长速率的增大而单调减小.     

海水中痕量重金属的薄膜扩散梯度技术原位富集

研究表明对生物体有直接作用的金属并非溶解态的全部,而是其中的活性部分.薄膜扩散梯度技术(DGT)作为一种原位富集有效态金属的新技术,被广泛应用于自然水体里重金属的分析.本研究设计了一种能同时原位富集海水中的Mn、Co、Ni、Cu、Zn、Cd、Pb的DGT装置;使用自制的凝胶扩散系数测定装置获得了金属离子在扩散相凝胶中的扩散系数;考察了pH、离子强度等对富集效果的影响,当pH为5.6~8.6、离子强度在10~700mmol/L范围内,富集效果不受影响.在厦门近岸海域成功地进行为期7d的海水中重金属的原位富集,实验结果显示,DGT能够富集该海域海水中6.672%~45.33%的溶解态重金属,即获得DGT有效态.平行样测定的相对标准偏差均小于10%,该方法可用于海水中痕量有效态重金属的分析.     

高效液相色谱法测定伏格列波糖口腔速溶膜中伏格列波糖的含量和有关物质

建立测定伏格列波糖口腔速溶膜剂中伏格列波糖含量及其有关物质的高效液相色谱法.采用柱后衍生HPLC荧光检测法,利用亲水C18色谱柱,流动相为0.045%辛烷磺酸钠的磷酸盐缓冲液—甲醇(94∶6),荧光检测器激发波长为350nm,发射波长为430nm,柱温为25℃,流动相与荧光试剂流速相同,进样量为100μL.结果显示,伏格列波糖与各个杂质峰分离较好,在25.0~50.0μg/mL范围内,伏格列波糖浓度与峰面积的线性关系良好(R=0.9999),高、中、低3种浓度的加样回收率为98.81%~101.58%,RSD为0.99%~1.27%,检测限和定量限分别为2ng和10ng.实验表明,所建立的方法准确可靠、专属性强,可用于伏格列波糖口腔速溶膜剂的质量控制.     

Atomic modeling for the initial stage of chromium passivation

The well-known anti-corrosive property of stainless steels is largely attributed to the addition of Cr,which can assist in forming an inert film on the corroding surface.To maximize the corrosion-resistant ability of Cr,a thorough study dealing with the passivation behaviors of this metal,including the structure and composition of the passive film as well as related reaction mechanisms,is required.Here,continuous electrochemical adsorptions of OH-groups of water molecules onto Cr terraces in acid solutions are investigated using DFT methods.Different models with various surface conditions are applied.Passivation is found to begin in the active region,and a fully coated surface mainly with oxide is likely to be the starting point of the passive region.The calculated limiting potentials are in reasonable agreement with passivation potentials observed via experiment.     

Biosensors based on acetylcholinesterase immobilized on mesoporous silica thin films

Using tetraethoxysilane and 3-aminopropyltriethoxysilane as the silica sources, amino-functionalized mesoporous silica thin films with 3-dimensional cubic structure have been deposited on conducting ITO substrate in the presence of surfactant F127 templates under acid conditions. The acetylcholinesterase （AchE） and cytochrome c （Cyt c） were incorporated into the pores of mesoporous thin films, and an amperometric biosensor was obtained. After adsorption of AchE and Cyt c, the ordered cubic structure of mesoporous silica and the bioactivities and electrochemical activities of the immobilized protein and enzyme molecules were retained. The sensor properties of the biosensor were investigated by using acetylthiocholine iodide as the substrate and Cyt c as the electron transfer mediator. The inhibition versus the logarithm of concentration was found to be linear to organophosphorus pesticide dichlorvos over the concentration ranges of 1.0×10-8 mol/L to 1.0×10-3 mol/L with the detection limit of 3.1×10^-9 mol/L.     

发光LB膜的制备与表征

该文介绍了一个用Langmuir-Blodgett技术制备发光超薄膜,并对薄膜进行表征的综合化学实验。详细阐述了实验目的、原理、主要仪器和试剂、实验内容,以及教学时数的安排。实验结合科研成果,内容涵盖无机合成、表面化学、仪器分析、材料学等领域。     

Preparation and magnetic properties of CoFe_2O_4/TiO_2 composite films

Using (Ti(OC_4H_9)_4) and metal chlorates as starting materials, CoFe_2O_4/TiO_2 composite films were pre-pared by sol-gel method. The effects of heat treatment temperature and pH of the precursor on micro-structure and magnetic properties were studied. The phase structure of the samples was examined by X-ray diffraction. The microstructure was examined by scanning electron microscope, atomic force microscope and polarized microscope. The magnetic property was measured by vibrating sample magnetometer. The results show that the crystals of different phases grow up independently. CoFe_2O_4 is uniformly embedded into the TiO_2 matrix in the prepared composite films, and the growth of com-posite films is dependent on the heat treatment temperatures and PH of the precursor. The average size of CoFe_2O_4 crystal is 19 nm in Nanocomposite film prepared when the heat treatment temperature is 800℃ and the pH of the precursor is between 2 and 3. The magnetism of the composite films is en-hanced as the heat treatment temperature increases.     

多孔Cu2O／SnO2复合薄膜的制备及其可见光催化降解罗丹明B的性能

采用浸渍-沉积方法在电沉积的多孔Cu薄膜上修饰一层纳米SnO2,经低温热氧化处理制备出多孔Cu2O／SnO2复合多层薄膜。运用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X-射线粉末衍射仪（XRD）、紫外可见漫反射光谱（UV—vis DRS）和荧光光谱（FS）技术表征了薄膜的结构、形貌和光学性质。测试了薄膜在可见光下降解罗丹明B（RhB）的性能。结果表明,在30℃的0．2mol／LCuSO4＋1．5mol／L H2SO4镀液中,以1.5A／cm^2电流沉积20s得蓟的多孔Cu薄膜,在SnO2溶胶中浸渍10s并重复5次,再经空气气氛下100℃焙烧30min,锻得的多孔复夸薄膜显示良好的可见光催化降解RhB的性铯。     

掺Cu的SrBi2Ta2O9薄膜的非线性光学特性的研究

以SrBi2Ta2O9陶瓷和高纯Cu片作为靶材,利用射频磁控溅射方法在双面抛光的石英基片上制备了掺Cu金属颗粒的SrBi2Ta2O9复合薄膜.用XRD和AFM表征了薄膜的结晶性能和表面形貌;利用单光束Z扫描技术在波长532 nm处测量了薄膜的非线性光学特性,其三阶非线性光学极化率的实部Reχ(3)=2.26×10-9esu,虚部Imχ(3)=0.62×10-9esu.