US 10,295,497 B2Granted

Organic membrane based screen printed microchip for potentiometric determination of lead

AssigneeKing Abdulaziz City for Science and Technology (KACST)

InventorsHassan Abdou Arida, Mohammad Ateeq AlDosari

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Abstract

A disposable screen-printed microchip based on an organic membrane sensitive layer is presented. The microchip is highly responsive for the determination of Lead(II). The microchip is composed of a composite sensitive material which comprises carbon nano-tubes “CNTs” and titanium (IV) oxide nano-particles embedded in a PVC membrane which was deposited on the surface of a plastic screen printed micro-electrode using a new methodology. The prepared disposable microchip provides a linear response for Pb2+ ions covering the concentration range of 1×10−6 to 1×10−1 mole L−1 with high sensitivity (49 mV), a long life span (>4 months) and short response time (10 s). The merits offered by the micro-sensor or microchip include small size, simple fabrication, mass production, integration feasibility and cost effectiveness and automation.

Claims4

Dependent claims

A method for making a microchip used for a potentiometric determination of lead (II), comprising the steps:

a. rinsing in double-distilled water a plastic microchip and air drying the plastic microchip to obtain a cleaned plastic microchip;
b. preparing a composite nano-particles ionophore which made up of a combination of carbon nano-tube (CNT) and Titanium (IV) oxide (TiO2), wherein the composite nano-particles ionophore comprises a mixture composed of 5 of CNT and 95 w/w % of TiO2;
c. preparing a cocktail coating mixture by adding the composite nano-particles ionophore, potassium Tetrakis (4-chlorophenyl) borate, anion excluder and polyvinyl chloride;
and
d. adding the cocktail coating mixture on to the surface of the cleaned plastic microchip as a substrate by the process of nebulization, to form an evenly layered sensitive organic membrane layer;
wherein the evenly layered sensitive organic membrane layer functions as a lead(II) micro sensor device, which is responsive to lead(II) (Pb2+).

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/195,142Filed 28 Jun 2016
Published: US 2017/0370873 A128 Dec 2017
Granted: 21 May 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G01N 27/3335
Ion-selective electrodes or membranes: the membrane containing at least one organic component
G01N 33/1813
Water: specific cations in water, e.g. heavy metals
G01N 33/20
Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00: metals
G01N
Investigating or analysing materials by determining their chemical or physical properties