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A method of altering the sensitivity and/or selectivity of a chemiresistor sensor array

A resistance sensor and sensitivity technology, applied in the field of sensor arrays, can solve the problems of difficult and high cost of chemical resistor arrays

Inactive Publication Date: 2009-02-18
SONY DEUT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This requires extensive and complex chemical synthesis work
Fabrication of chemiresistor arrays that combine different sensitive materials in one device is even more difficult and costly because of the patterning steps involved for each sensitive material

Method used

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  • A method of altering the sensitivity and/or selectivity of a chemiresistor sensor array
  • A method of altering the sensitivity and/or selectivity of a chemiresistor sensor array
  • A method of altering the sensitivity and/or selectivity of a chemiresistor sensor array

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Experimental program
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Effect test

Embodiment 1

[0063] Among various materials, gold nanoparticles interconnected with organic poly- or dithiols are particularly suitable. These are prepared as described in EP 00 127 149 and EP 05 025 558.7. In the simplest case of interconnecting alkylene dithiols, functionalized SH groups can be oxidized, eg by ozone treatment.

[0064] The X-ray photoelectron spectra (shown in Figure 2) of nonanedithiol-interconnected gold nanoparticles prepared by the layer-by-layer self-assembly method mainly reveal Au-S-R and R-S-H before treatment with ozone and after treatment with ozone Au-SO x (1 min ozone treatment in UVO-Cleaner, model no. 42-220, Jelight Company Inc., CA, USA). Due to this treatment, the sensitivity and selectivity of the sensor changes (compare image 3 ).

[0065] Figure 2 shows sulfur (2p) X-ray photoelectron spectra of chemistor coatings with and without ozone treatment. Ozone treatment is performed by generating ozone in situ.

[0066] As shown in the response traces...

Embodiment 2

[0068] A comparable effect is obtained by oxidative treatment of the sensor by soaking the chemi-resistor in, for example, a 5% hydrogen peroxide solution for 1-60 seconds.

Embodiment 3

[0070] For a single sensor device, this post-fabrication process allows selective conditioning of the sensor at a location different from where the sensor was fabricated and at a time significantly later than the original fabrication. This means that the consumer or the technician or any end user can adjust the sensor to specific needs at the end user if possible (cf. Figure 4 ).

[0071] Conditioning is facilitated by the use of special treatment kits that include different chemicals.

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Abstract

This invention relates to the method for altering the sensitivity and / or the selectivity of the chemiresistor sensor, the sensor and the sensor array manufactured by such a method. The chemiresistor sensor includes a sensing layer having a plurality of conductive particles or semiconductor particles embedded in an electrically nonconductive matrix, and the sensing layer includes a plurality of oxidizable chemical functional groups. This method includes a stage of causing oxidation reaction to the sensing layer. The invention also relates to a sensor and a sensor array produced by the method.

Description

technical field [0001] The present invention relates to a method of altering the sensitivity and / or selectivity of a chemiresistive sensor, to the sensor and to the sensor array produced by the method. Background technique [0002] Chemiresistive sensors for the detection of analytes in conductive nanocomposite-based fluid phases, such as gases and vapors, include conductive components dispersed in nonconductive or semiconductive media. Metal nanoparticles, carbon black nanoparticles or conductive nanofibers can be used as conductive components. The non-conductive component is generally an organic material, which serves as the continuous phase (in which the conductive particles are distributed). Non-conductive materials may also include functionalized organic molecules that serve as capping ligands for metal nanoparticles or for interconnecting particles in a three-dimensional network. [0003] The principle of operation of these sensors consists of measuring changes in me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/125B82Y15/00
Inventor Y·约瑟夫T·沃斯迈耶安田章夫
Owner SONY DEUT GMBH
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