An Improved Next Generation Off-Laboratory Polymer Chip Electrode

Patent metadata

Field	Value
Publication number	US-2017082576-A1
Application number	US-201515309327-A
Country	US
Kind code	A1
Filing date	May 8, 2015
Priority date	May 9, 2014
Publication date	Mar 23, 2017
Grant date	—

Abstract

The present invention provides a polymer based bulk conducting electrodes. These electrodes have several advantages over the conventional screen printed and coated electrodes. The present invention also provides biodegradable variant of these electrodes. Such electrode are found comparable to the conventional noble metal electrode and glassy carbon electrode in various electrochemical techniques like cyclic voltammetry of different redox couple, amperometric sensing of hydrogen peroxide, stripping voltammetry of lead (II) ion, electrodeposition of zinc and electropolymerization of aniline in aqueous medium.

First claim

1 . A self-standing polymer chip electrode comprising graphite and a polymer in the weight ratio ranging between 70:30 to 40:60, wherein the polymer used is selected from the group consisting of poly (methyl methacrylate) (PMMA), polystyrene (PS) and polyvinyl chloride (PVC) for non-biodegradable electrodes; or poly (lactic acid) (PLA) for biodegradable electrodes,
wherein said electrode has thickness in the range of 0.42 mm to 0.50 mm and electrical conductivity in the range of 2.3×10 −2 S/cm to 1.1×10 −11 S/cm.

2 . A process for the preparation of electrode as claimed in claim 1 comprising the steps of:
(i) preparing a polymer solution by dissolving a polymer in a solvent by sonication and heating till complete dissolution of the polymer;
(ii) mixing graphite and the polymer solution prepared in step (i) in a weight ratio ranging between 70:30 to 40:60 to obtain a mixture;
(iii) sonicating the mixture as obtained in step (ii) for a period in the range of 10 to 15 minutes to obtained a uniformly disperse suspension;
(iv) flooring a glass mould with a polyester sheet which is insoluble in an organic solvent as a template with the provision of pulling off;
(v) pouring the suspension obtained in step (iii) over the glass mould obtained in step (iv) to obtain a film over the glass mould;
(vi) drying the film obtained in step (iv) for 24 hours at room temperature in the range of 25-30° C. by slow evaporation; and
(vii) cutting the film followed by removing of polyester template to obtain the electrode.

3 . The process as claimed in claim 2 , wherein the thickness of the film having graphite: polymer weight ratio in the range from 70:30 to 40:60 is in the range of 0.5 mm to 0.42 mm for 48.99 cm 2 casting area and 3 gm total mass.

4 . The process as claimed in claim 2 , wherein electrical conductivity of the electrode having graphite: polymer weight ratio in the range from 70:30 to 40:60, when various polymers are used is in the range of 2.3×10 −2 S/cm to 1.1×10 −11 S/cm.

5 . The process as claimed in claim 2 , wherein the thermal stability of the electrode is up to 300° C.

6 . The process as claimed in claim 2 , wherein the polymer used is selected from the group consisting of poly (methyl methacrylate) (PMMA), polystyrene (PS), polyvinyl chloride (PVC) and poly (lactic acid) (PLA).

7 . The process as claimed in claim 2 , wherein the solvent used is selected from the group consisting chloroform and tetrahydrofuran.

8 . The electrode as claimed in claim 1 for use in electrochemistry and electroanalysis in aqueous media.

9 . The electrode as claimed in claim 1 , wherein physical dimensions of said electrode are controlled by fixing total amount of graphite and polymer for a certain casting area.

Assignees

• Council Scient Ind Res

Inventors

• Srivastava Divesh Narayan
• Perween Mosarrat
• Gupta Rajeev
• Parmar Dilip Bhimjibhai

Classifications

• C25C1/16

  of zinc, cadmium or mercury · CPC title

• G01N27/48 Primary

  using polarography, i.e. measuring changes in current under a slowly-varying voltage · CPC title

• G01N27/308 Primary

  at least partially made of carbon · CPC title

• C25C7/02

  Electrodes (consumable anodes for the refining the metals C25C1/00 - C25C5/00); Connections thereof · CPC title

• C25B3/02

  Chemistry & Metallurgy · mapped topic