Bipolar resistive switching in BiFe_(0.95)Zn_(0.05)O_3 films

Bipolar resistive switching is studied in BiFe0.95Zn0.05O3 films prepared by pulsed laser deposition on （001） SrTiO3 substrate, with LaNiO3 as the bottom electrode, and Pt as the top electrode. Multiple steps of resistance change are ob- served in the resistive switching process with a slow voltage sweep, indicating the formation/rupture of multiple conductive filaments. A resistive ratio of the high resistance state （HRS） to the low resistance state （LRS） of over three orders of mag- nitude is observed. Furthermore, the conduction mechanism is confirmed to be space-charge-limited conduction with the Schottky emission at the interface with the top Pt electrodes in the HRS, and Ohmic in the LRS. Impedance spectroscopy demonstrates a conductive ferroelectric/interfacial dielectric 2-layer structure, and the formation/rupture of the conductive filaments mainly occurs at the interfacial dielectric layer close to the top Pt electrodes.     

化学发光成像分析法定量检测人尿液中β-人绒毛膜促性腺激素

采用一种灵敏、简单的方法,可实现对β-人绒毛膜促性腺激素（β-HCG）的高通量检测。本法具有酶联免疫吸附（ELISA）法的特异性、增强化学发光法（ECL）的高灵敏度及化学发光成像分析高样品通量等优点。冷却电感耦合（CCD）成像系统被用于检测增强化学发光信号。发光强度值与β-HCG在12．5-400mIU／mL范围内呈线性关系;检出限为4mIU／mL。测定了妇女尿液中β-HCG的含量,分析结果与医院的诊断结果一致。     

流动注射化学发光法测定己烯雌酚

基于己烯雌酚对鲁米诺与高碘酸钾在碱性介质中反应产生的化学发光信号有较强的增敏作用，建立了测定己烯雌酚的流动注射化学发光分析法。己烯雌酚质量浓度在13．4—1340μg／L范围内与化学发光强度呈良好的线性关系，检出限（3d）为4μg／L；对26．8μg／L己烯雌酚进行11次平行测定，相对标准偏差（RSD）为1．4％。该法已用于药物制剂中己烯雌酚的测定。     

化学发光成像法测定人体血清中乙型肝炎病毒

基于对碘苯酚增强的luminol-H2O2-HRP化学发光反应,利用化学发光成像法检测乙肝病毒(HBV)。用该法对人体血清中的乙型肝炎表面抗原、表面抗体、e抗原、e抗体以及核心抗体进行测定,其结果与ELISA法所得结果一致,对表面抗原检测结果为阳性的病人血清测定9次,结果的相对标准偏差为4．2％。     

流动注射化学发光法测定褪黑素

在强碱性介质中,铁氰化钾可直接氧化褪黑素产生化学发光。基于此,建立了一种测定褪黑素的流动注射化学发光分析方法。线性范围为1.9×10-6~2.3×10-4g/mL,检出限为5×10-7g/mL,该法已用于药物中褪黑素的测定。