利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

2 条记录 (耗时 0.008 秒)

    DEPOSITION OF THIN ELECTROCONDUCTIVE POLYMER FILM OF DESIRED RESISTANCE FOR GAS SENSING APPLICATIONS
    1.
    发明公开
    DEPOSITION OF THIN ELECTROCONDUCTIVE POLYMER FILM OF DESIRED RESISTANCE FOR GAS SENSING APPLICATIONS 失效
    薄壳分离，电阻导电聚合物膜所需的，FOR GASDEDTEKTIERANWENDUNGEN

    公开(公告)号：EP0931183A4

    公开(公告)日：2001-03-07

    申请号：EP97942321

    申请日：1997-09-12

    申请人： IND RES LTD

    发明人： PARTRIDGE ASHTON CYRIL ,  HARRIS PAUL DAVID ,  ANDREWS MICHAEL KENNETH

    IPC分类号： C25D13/12 ,  C25D13/18 ,  H01C17/22 ,  C25D13/08 ,  C25D13/16

    CPC分类号： C25D13/12 ,  C25D13/18 ,  H01C17/22

    摘要： Electrodeposition of thin sensing polymers on microelectrodes, grown apparently to the same parameters, show wide resistance variations. Thicker films of more consistent resistance are too slow to respond, because of the time taken for the target gas to diffuse through them. These drawbacks may be overcome by tailoring thin electroconductive polymer films to the resistance required, by measuring the resistance at intervals during deposition and continuing to deposit film, until a high or predetermined resistance is obtained. This may be effected in a time multiplexed fashion, in which an electrodeposition current pulse is applied to the electrodes, followed by a period in which the inter-electrode is measured using a voltage below the threshold, at which electrodeposition occurs. Alternatively, an AC method, capable of measuring high impedance at low voltages may be employed and the measurement of resistance may be carried out simultaneously with the deposition. A typical electroconductive polymer is polypyrrole, which may ber deposited at a potential of 750 - 900 mV. Pyrrole forms an oligomer from solution prior to deposition and polymerisation is completed in situ. The substrate is preferably a microelectrode array, with elements about 1000 mu long, several mu wide and spaced about 10 mu apart, (i.e., within the distance, wherein the concentration decreases by a factor of 3). A counter electrode to supply the required current, in either a potentio or galvano-static mode is also required. In operation as a gas sensor, the power should be as low as possible to ensure that resistance changes represent a gas response alone, unaffected by measurement factors.