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    • 21. 发明授权
    • Sensors for detecting analytes in fluids
    • 用于检测流体中分析物的传感器
    • US6093308A
    • 2000-07-25
    • US258713
    • 1999-02-26
    • Nathan S. LewisErik Severin
    • Nathan S. LewisErik Severin
    • G01N27/12G01N33/00G01N27/26
    • G01N27/126G01N33/0031
    • Chemical sensors for detecting analytes in fluids comprise first and second conductive elements (e.g., electrical leads) electrically coupled to and separated by a chemically sensitive resistor which provides an electrical path between the conductive elements. The resistor comprises a plurality of alternating nonconductive regions (comprising a nonconductive organic polymer) and conductive regions (comprising a conductive material) transverse to the electrical path. The resistor provides a difference in resistance between the conductive elements when contacted with a fluid comprising a chemical analyte at a first concentration, than when contacted with a fluid comprising the chemical analyte at a second different concentration. Arrays of such sensors are constructed with at least two sensors having different chemically sensitive resistors providing dissimilar such differences in resistance. Variability in chemical sensitivity from sensor to sensor is provided by qualitatively or quantitatively varying the composition of the conductive and/or nonconductive regions. An electronic nose for detecting an analyte in a fluid may be constructed by using such arrays in conjunction with an electrical measuring device electrically connected to the conductive elements of each sensor.
    • 用于检测流体中的分析物的化学传感器包括电耦合到化学敏感电阻器并且由化学敏感电阻器分隔的第一和第二导电元件(例如电引线),其提供导电元件之间的电路径。 电阻器包括多个交替的非导电区域(包括非导电有机聚合物)和横向于电路径的导电区域(包括导电材料)。 当与包含第一浓度的化学分析物的流体接触时,电阻器在与包含化学分析物的流体以第二不同浓度接触时与导电元件之间的电阻差异。 这种传感器的阵列由具有不同化学敏感电阻器的至少两个传感器构成,提供不同的电阻差异。 通过定性地或定量地改变导电和/或非导电区域的组成来提供从传感器到传感器的化学敏感性的变化。 用于检测流体中的分析物的电子鼻可以通过使用这样的阵列结合电连接到每个传感器的导电元件的电测量装置来构造。
    • 29. 发明授权
    • Stabilization of Si photoanodes in aqueous electrolytes through surface alkylation
    • 通过表面烷基化稳定水性电解质中的Si光电阳极
    • US06759349B2
    • 2004-07-06
    • US09305125
    • 1999-05-04
    • Nathan S. LewisAshish Bansal
    • Nathan S. LewisAshish Bansal
    • H01L21469
    • H01G9/2045Y02E10/542
    • A two-step chlorination/alkylation technique used to introduce alkyl groups, —CnH2n+1 (n=1-6), functionally onto single-crystal, (111)-oriented, n-type Si surfaces. H-terminated Si photoanodes were unstable under illumination in contact with an aqueous 0.35 M K4Fe(CN)6-0.05 MK3Fe(CN)6 electrolyte. Such electrodes displayed low open-circuit voltages and exhibited a pronounced time-dependent deterioration in their current density vs potential characteristics due to anodic oxidation. In contrast, Si surfaces functionalized with —CH3 and —C2H5 groups displayed significant improvements in stability while displaying excellent electrochemical properties when used as photoelectrodes in the aqueous Fe(CN)63−/4− electrolyte.
    • 用于将烷基-CnH2n + 1(n = 1-6)的官能化引入到单晶,(111)取向的n型Si表面上的两步氯化/烷基化技术。 H封端的Si光电阳极在与0.35M K4Fe(CN)6-0.05 MK3Fe(CN)6电解质水溶液接触的照明下不稳定。 这样的电极显示出较低的开路电压,并且由于阳极氧化,其电流密度与电位特性呈显着的时间依赖性劣化。 相比之下,用-CH 3和-C 2 H 5基团官能化的Si表面在稳定性方面显示出显着的改善,同时在Fe(CN)6 <3- / 4->电解质水溶液中用作光电极时显示优异的电化学性能。