||YAO Zhi-gang1, TAN Xiao-chen2, WU Bo-mao3 (1. Dept. of Optic & Electron Engineering, Ordnance Engineering College, Shijiazhuang 050003, China; 2. 4th Department, 63961 Army of PLA, Beijing 100012, China; 3. 76321 Army of PLA, Guangzhou 510500, China);Design of Virtual Multimeter Based on ISA Bus[J];Ordnance Industry Automation;2006-01
||SHA Zhan-you, LIU A-fang, WANG Ke (Hebei University of Science and Technology, Shijiazhuang Hebei 050054, China);Circuit Optimizing Design of Intelligent Digital Multimeter[J];Power Supply Technologies and Applications;2005-10
||Qian Zhongren;Wang Shaonian;Yan Shuanglong;Xu Xiaohai (Jiangsu Electroanalytical Instrument Factory, Jiangyan,225500);Model CH - 1 constant potential potentiometer[J];ANALYTICAL INSTRUMENTATION;1999-03
||SUN Wei 1,2 , JIAO Kui 2** , WANG Hai-yu 2 and LU Lu-de 1 1. College of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, P. R. China; 2. College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China;Electrochemical Determination of Alkaline Phosphatase in Human Serum by Differential Pulse Voltammetry[J];高等学校化学研究(英文版);2004-06
||Jing Haiyun Zhangjiakou Coal Mining Machinery Co.Ltd;Analysis and Application of the Accurate Rectifier[J];Journal of Hebei Institute of Architectural Engineering;2004-03
||LIN Wei-xin1,TIAN Zuo-hua1,WANG Xiao-ping2 (1.Department of Automation,Shanghai Jiaotong University,Shanghai 200240,China;2.Department of Optical Engineering,Zhejiang University,Hangzhou 310027,China);A Realization Method of Artificial Electronic Tongue Based on the Three-Electrode System[J];Measurement & Control Technology;2007-06
||CHEN Hongyuan , CAI Chenxin
and JU Huangxian
(Department of Chemistry, Nanjing University, Nanjing 210093, China) The array device prepared by the above procedure was rinsed thoroughly with water. The electrochemical characteristics of the PPy/DP/IDA were investigated in phosphate bufffer solution. At the start of each measurement the device was held at + 0.1 V for about 30 s to oxidize the polypyrrole, the device was disconnected from the potentiostat and a bias of 20 mV was applied between the two sets of microeleetrodes, then NADH was added. The ID, flowing through the polypyrrole between the two sets of microeleetrodes, was recorded as a function of time and the effect of NADH concentration on the device "on-off" time was investigated.
2 Results and discussion
2.1 Characteristics of PPy/DP/IDA device
The basic principle of the PPy/DP/IDA device and its response to NADH are shown in fig. 2. Fig. 3 depicts the ID vs. VG plot for the PPy/DP/IDA device, which was obtained by changing the value of voltage VG, at the same time /D was measured (VD = 20mV was
maintained). The polypyrrole is practically an insulator at the value of VG below -0.2V, and there is no current flowing between the two sets of arrays of IDA electrode, i.e. ID=0 and the PPy/DP/IDA device is in "off" state. When the VG is higher than -0.1 V, there is a current flowing between the IDA electrodes. The conductance of the polypyrrole increases with the increasing value of VG and keeps almost constant when its value is above +0.1V. At this time, the polypyrrole is in oxidized form and conductive, and the PPy/DP/IDA device is in "on" state.
2.2 Response of PPy/DP/IDA device to NADH
The ID vs. VD characteristic of PPy/DP/IDA device (fig. 3) indicates that the chemical reducing agents with formal potential less than -0.2V can potentially reduce the polypyrrole from conductive state to insulating state and thus turn the PPy/DP/IDA device from "on" state to "off" state, consequently the PPy/DP/IDA;Biomolecular sensor based on a polypyrrole-coated microelectrode array[J];科学通报(英文版);1996-17
||HE Gui-fang(Department of Information Engineering,Shandong Jiaotong University,Jinan 250023,China);Three practical circuits design of precision voltage conditioner TL431[J];Shandong Science;2006-01