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Thick film conductor composition for use in biosensors

A technology for compositions and mixtures, which can be applied in the direction of carbon-silicon compound conductors, determination/inspection of microorganisms, biochemical equipment and methods, etc., and can solve problems such as being unsuitable for low-cost and high-volume production

Inactive Publication Date: 2004-03-24
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inks based on thermosetting polymer binders require long curing periods to form a cross-linked matrix, thus making them unsuitable for low-cost, high-throughput sensor processing

Method used

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  • Thick film conductor composition for use in biosensors
  • Thick film conductor composition for use in biosensors
  • Thick film conductor composition for use in biosensors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Platinum black, PTMEG, graphite (TimrexSFG-15, Timcal, OH) and conductive carbon black (SuperP, with a specific surface area of ​​60m 2 / g, manufacturer: MMMCarbon, Belgium). A composition was prepared by mixing 10 parts of polymer solution (A), 36 parts of ethylene glycol diacetate, 2.0 parts of aromatic hydrocarbon 150, 3.4 parts of graphite, 3.0 parts of carbon black, and 0.38 parts of platinum dispersion (C). The printed sensor of this Pt / c ink was tested for sensor performance. Test A yielded a sensitivity of 50-53nA / cm 2 .μM H 2 o 2 , the background current is 8-10nA. Test B yielded percent glucose recoveries of 54-56% at 24°C and 70-76% at 32°C with background currents of 63-67nA at 24°C and 92-105nA at 32°C. Test C yielded a sensitivity of 59nA / cm 2 .μM H 2 o 2 , the background current is 2nA. The results obtained from Test C are plotted on figure 1 middle. The net Pt / C paste composition is as follows:

[0072] Composition Weight percent (%) ...

Embodiment 2

[0081] A Pt / C composition with a Pt / (graphite+carbon) ratio of 1 / 99 was prepared in the same manner as in Example 1. A composition was prepared by mixing 0.15 parts of PTMEG and 46 parts of the Pt / C mixture. The Pt / C composition contained 24.6 parts of polymer solution (A), 50 parts of ethylene glycol diacetate, 4 parts of aromatic 150, 7.73 parts of graphite, 5.07 parts of carbon black and 0.293 parts of platinum dispersion (C). Test A yielded a sensitivity of 40nA / cm 2 .μM H 2 o 2 , the background current was 12nA, the recovery rate of glucose obtained in test B was 43%, and the background current was 53-56nA. Test C yielded a sensitivity of 19nA / cm 2 .μM H 2 o 2 , the background current is 2nA. The net Pt / C paste composition is as follows:

[0082] Ingredient Weight Percentage

[0083] Platinum black 0.14

[0084] PTMEG 0.40

[0085] Graphite 8.43

[0086] Carbon black 5.53

[0087] Poly(styrene-acrylonitrile) 6.7...

Embodiment 3

[0091] A Pt / C composition similar to Example 1 was prepared in the same manner as above, but the Pt / C (graphite+carbon) ratio was 1.5 / 98.5. Test A yielded a sensitivity of 38-45 nA / cm 2 .μM H 2 o 2 , background current 3-6nA. Test B yielded a glucose recovery of 55-51% with a background current of 59-71 nA. The net Pt / C paste composition is as follows:

[0092] Ingredient Weight Percentage

[0093] Platinum black 0.18

[0094] PTMEG 0.12

[0095] Graphite 6.0

[0096] Carbon black 5.3

[0097] Poly(styrene-acrylonitrile) 4.4

[0098] Ethylene glycol diacetate 80.5

[0099] Aromatics 150 3.5

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Abstract

This invention is directed to a composition comprising: (a) platinum group metal powder, alloys, or mixtures thereof as a powder or deposited on graphite supports; (b) poly(glycol ether), derivatives, or mixtures thereof; (c) carbon-based electrically conductive filler; and (d) thermoplastic polymer or mixtures thereof. The invention is further directed to a process for dispersing platinum group metal powder, alloys, or mixtures thereof in poly(glycol ether), derivatives, or mixtures thereof. The invention is further directed to the above composition wherein the platinum group metal powder has been dispersed according to the above process.

Description

field of invention [0001] The present invention relates to improvements in polymer thick film (PTF) compositions containing platinum group metal catalysts, catalyst boost additives, graphite or conductive carbon fillers and thermoplastic binders. The improved PTF conductor composition can be applied as printed sensing / working electrodes for electrochemical biosensors based on hydrogen peroxide assay. Background technique [0002] Electrochemical biosensors are combinations of electrochemical sensors and biomolecular recognition elements for the analysis of biological analytes such as glucose, cholesterol, creatinine, ethanol, uric acid, lactate in body fluids and for this purpose also in medical diagnostics The field of medical equipment and analytical instruments. [0003] Most electrochemical biosensors fall into the following two types: (1) metal-catalyzed electrochemical biosensors or (2) electron-transfer mediator-modified electrochemical biosensors, for example, metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/327C12Q1/00G01N27/00G01N27/30
CPCG01N27/30G01N27/308C12Q1/006H01B1/04
Inventor M·-S·占
Owner EI DU PONT DE NEMOURS & CO