Aging characteristic investigation of VLEDs with current blocking layer structure

发现ICP dAMAgE制作电流阻挡层的制程会导致垂直结构lEd在老化过程中发生漏电。通过更换反射层的金属及EMMI&SEM分析,发现老化漏电的原因来源于反射金属——Ag的电迁移,迁移通道可能来源于ICP打开穿透位错的封口。在缺陷位错内填入低电迁移率金属并检测。结果表明,填入低电迁移率金属后既解决了老化漏电问题,同时不影响芯片的初始光电特性。The failure of current leakage in the process of ICP-damage current blocking layer was found.Through changing reflecting layer metal and EMMI & SEM inspection, it was found that the failure can be ascribed to reflecting metal Ag electro migration, whose migrating channel may be ascribed by penetrating dislocation seal opened by the ICP treatment.Low electro migration rate metal was deposited in the defect dislocation, then the chip was tested.Results show that the question of aging current leakage is solved after the low electro migration rate metal to be deposited.Meanwhile, initial lighting property of the chip isn't influenced.2013年国家发改委产业振兴与技术改造项

The Electrochemical Properties of 1-Pyrenebutyric acid/Graphene Composites and Their Application in Glucose Biosensors

本文采用一步法制备了1-芘丁酸/石墨烯复合物(PBA/G)，研究了其电化学性质. 采用铁氰化钾和亚铁氰化钾电化学探针测定了电化学阻抗滴定曲线，确定了PBA/G的表观pKa为6.2. 此外，将葡萄糖氧化酶(GOD)共价键合在PBA/G表面构建了葡萄糖电化学传感器，其电化学响应与葡萄糖浓度（5 mmol L-1浓度范围内）呈线性，检测限为0.085 mmol L-1. 实验还测定了固定在PBA/G表面的GOD的表观米氏常数为5.40 mmol L-1，表明固定化的GOD对葡萄糖有较高的催化活性。The electrochemical properties of 1-pyrenebutyric acid/graphene composites (PBA/G) obtained by one-step synthesis via π-π stacking was investigated. The electrochemical impedance titration curve shows the surface charge changes as function of solution pH by using ferricyanide/ferrocyanide redox couple as the probe. An apparent pKa value is estimated as 6.2 according to the impedance titration curve. In addition, a glucose biosensor was constructed by immobilizing glucose oxidase (GOD) on the surface of PBA/G via covalent interaction. This biosensor shows a linear response to glucose within the concentration up to 5 mmol L-1 with a detection limit of 0.085 mmol L-1. A small apparent Michaelis-Menten constant (5.40 mmol L-1) of the immobilized GOD suggests that the immobilized GOD retains its bioactivity and shows high catalytic activity to glucose.This work was financially supported by the National 973 Basic Research Program (No. 2012CB933804), the National Natural Science Foundation of China(No. 21035002, No. 21121091) and the Natural Science Foundation of Jiangsu province (BK2010009)This work was financially supported by the National 973 Basic Research Program (No. 2012CB933804), the National Natural Science Foundation of China(No. 21035002, No. 21121091) and the Natural Science Foundation of Jiangsu province (BK2010009)作者联系地址：南京大学 化学化工学院，生命分析化学国家重点实验室，江苏 南京 210093Author's Address: State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China通讯作者E-mail：[email protected]

Electrochemiluminescence Imaging Hydrogen Evolution Reaction on Single Platinum Nanoparticles Using a Bipolar Nanoelectrode Array

本文制备了嵌于多孔阳极氧化铝（AAO）膜中直径为200 nm,间距为450 nm的高密度（5.7 × 108 cm-2）的金纳米电极阵列,纳米电极分布规则,尺寸高度均一。我们将该金纳米电极阵列作为双极电极阵列,可将电极一侧的电化学法拉第信号在另一侧电极上转化成电致化学发光（ECL）信号,从而实现对单个铂纳米颗粒上氢气析出反应（HER）进行亚微米空间分辨率的电化学成像。本文介绍的方法为高空间分辨率成像电催化材料、能源材料以及细胞过程的局部电化学活性提供了一个良好的平台。A high-density (5.7 × 108 cm-2) nanoelectrode array with the electrode diameter of 200 nm and the interelectrode distance of 450 nm were fabricated. The nanoelectrode array consisted of gold nanowires embedded in a porous anodic aluminum oxide (AAO) matrix, having regular nanoelectrode distribution and highly uniform nanoelectrode size. The gold nanoelectrode array was used as a closed bipolar nanoelectrode array combined with electrochemiluminescence (ECL) method to map the electrocatalytic activity of platinum nanoparticles toward hydrogen evolution reaction (HER) by modifying the catalysts on single nanoelectrodes. Results show that HER on single bipolar nanoelectrodes could be imaged with the sub-micrometer spatial resolution. The present approach offers a platform to image local electrochemical activity of electrocatalytic materials, energy materials and cellular processes with high spatial resolution.通讯作者:夏兴华E-mail:[email protected]:Xing-HuaXiaE-mail:[email protected]生命分析化学国家重点实验室,南京大学化学化工学院,江苏 南京State Key Lab of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering,Nanjing University, Nanjing 210023, Jiangsu Chin

Study of the Nature of Formic Acid Adsorbates on Rough Pt and its Interaction with CO

应用现场红外反射光谱（ＦＴＩＲ）和微分电化学质谱（ｄｉｆｆｅｒｅｎｔｉａｌｅｌｅｃｔｒｏｃｈｅｍｉｃａｌｍａｓｓｓｐｅｃｔｒｏｍｅｔｅｒ，ＤＥＭＳ）研究了甲酸在多孔Ｐｔ上吸附质的性质．伏安结果显示了甲酸在多孔Ｐｔ上吸附质的氧化与吸附电位和吸附时间有关．在线质谱结果表明从甲酸吸附质氧化成二氧化碳所需要的电子数（ｎｅ）与吸附电位无关．显然地ｎｅ＝２．２说明了甲酸吸附质是由ＣＯ和ＣＯＨ组成，而不是只有单一的ＣＯ或者ＣＯＨ．另一方面，在１２６２ｃｍ－１和２０４８ｃｍ－１出现的现场红外光谱带证实了甲酸在多孔Ｐｔ上的吸附质中存在ＣＯ和ＣＯＨ表面物质．此外，用ＤＥＭＳ技术和碳－１３同位素标的甲酸作探针研究了甲酸吸附质和ＣＯ的相互作用．结果表明溶液中的甲酸不能取代先吸附的ＣＯ，而溶液中的ＣＯ可以与７５％先吸附的甲酸吸附质发生交换．The nature of formic acid adsorbates formed on porous platinum electrode has been studied by in situ infrared reflectance spectroscopic (FTIR) and differential electrochemical mass spectroscopic (DEMS) techniques. By carefully avoiding the contamination of the environment( i.e ., air) voltammetric experiments show that the oxidation of formic acid adsorbates depends on both adsorption potential and adsorption time. The online DEMS results show furthermore that the number of electrons necessary for the formation of one molecule of CO 2 from adsorbed formic acid is independent of the adsorption potential. Its value of 2.2 demonstrates that the composition of formic acid adsorbates is a mixture of CO and COH, but not CO or COH alone. The existence of these two species has been clearly proved by in situ FTIR experiments on electrodeposited platinum with a roughness factor of 11. The bands at 1 262 cm -1 , 1 840 cm -1 , and in the frequency range of 2 048 to 2 060 cm -1 are due to the surface adsorbed COH, bridge and linearly bound CO ad , respectively. In addition, the interaction between formic acid adsorbates and CO has been investigated by using DEMS via isotopic labelled 13 C formic acid as a probe as well. These experiments show that the surface species previously fromed from CO and formic acid cannot be exchanged by formic acid in solution. whereas about 75 percent of the firstly formed formic acid adsorbates can be replaced by bulk CO.作者联系地址：波恩大学物理化学所Author's Address: Institute of Physical Chemistry, Bonn University, Wegelerstrabe 12, D 53115 Bonn 1, German

卟啉及其金属配合物在水/硝基苯界面的电化学功能研究

学位：理学硕士院系专业：化学化工学院化学系_物理化学(含化学物理)学号：MJ10014

Method of edge detection parameters selection automatically in unstructured environment

分析了基于梯度的边缘检测算法,针对其在参数确定自主能力不高的问题,提出一种新的基于大津法和统计理论的自适应边缘提取方法,通过对一组参数进行统计优化,自适应地确定边缘检测的全局最优参数,最后,采用Canny边缘检测算子对本算法进行验证.实验结果表明,本文提出的非结构环境下目标自适应边缘提取方法能够有效地抑制噪声,自适应地确定图像最优边缘参数,提高了边缘定位精度

一种新的基于Canny算法的自适应边缘提取方法

深入分析了经典的Canny边缘检测算法，针对其在实际应用中存在的不足进行改进，提出一种新的基于Canny算法的自适应边缘提取方法，利用Wiener滤波器对图像进行平滑滤波；将二维的高斯卷积模板进行降维分解；利用图像梯度值，引入统计理论方法，自适应地给出了边缘检测的全局动态阈值.实验结果表明本文提出的改进Canny自适应边缘提取方法，能够有效地抑制噪声，加快了算法的运行速度，并且能够根据不同的图像，自适应地给出边缘提取阈值，提高了边缘定位精度，边缘检测的性能要优于传统的Canny边缘检测器

Influence of Pt:Ru Ratio in Nanotubes Array Structures on the Electrocatalytic Activity of Methanol Oxidation

采用电化学沉积技术在3-氨丙基三甲基硅氧烷修饰的多孔氧化铝膜板中制备了具有不同Pt/Ru原子比的双元Pt/Ru阵列纳米管电极（NTAEs）。分别用X-射线衍射和扫描电镜表征了催化剂结构和形态。电化学结果表明：通过控制前驱沉积液的浓度可得到不同PtRu原子比的NTAEs。所制备的Pt 或 Pt/Ru合金阵列纳米电极的真实表面积大，催化活性强，有利于物质传输，对甲醇电氧化显示出显著的催化性能。实验中还系统研究了催化剂组成与CO和CH3OH电催化氧化性能的关系，发现Pt/Ru=50:50的阵列纳米管电极对CO电氧化显示出最好的催化活性；对甲醇电氧化，则Ru原子比为40%的催化剂显示最佳催化性能。Bimetallic PtRu nanotubes array electrodes (NTAEs) with varied Pt to Ru atomic ratios have been prepared by electrochemical codeposition in 3-aminopropyltri-methoxysilane modified porous anodic alumina (PAA) membranes. The structure and morphology of the catalysts were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Electrochemical results showed that the NTAEs with varied atomic ratios could be achieved by controlling the precursor concentration for deposition. The prepared nanoarrays composed of Pt or PtRu alloy promoted the mass-normalized activity toward the sluggish electrooxidation reaction of methanol due to the increased catalytic activity and real surface area, as well as the improved mass transport through the catalysts. Correlations between the anode composition and the electrocatalytic activity of the catalysts toward the electrooxidations of CO and CH3OH were systemically investigated. The PtRu NTAEs containing ca. 50% Ru showed the highest activity for CO electrooxidation, while the PtRu NATEs of 40% Ru for CH3OH electrooxidation.This work was financially supported by the National 973 Basic Research Program (2012CB933800), the National Natural Science Foundation of China (21035002, 21275070, 21205059), the National Science Fund for Creative Research Groups (21121091), Nanjing Medical Science and technique Development Foundation(QRX11129)This work was financially supported by the National 973 Basic Research Program (2012CB933800), the National Natural Science Foundation of China (21035002, 21275070, 21205059), the National Science Fund for Creative Research Groups (21121091), Nanjing Medical Science and technique Development Foundation(QRX11129)作者联系地址：生命分析化学国家重点实验室，南京大学化学化工学院，南京210093Author's Address: State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China通讯作者E-mail：[email protected]

木质纤维素催化转化制备能源平台化合物

With the shortage of fossil fuels and the concerns related to their environmental impact and greenhouse gas effect,extensive research and development programs have been initiated worldwide to convert biomass into valuable products for future biofuels an