Using polypyrrole as the contrast pH detector to fabricate a whole solid-state pH sensing device
First Claim
1. A process for fabricating a whole solid-state pH sensing device by using polypyrrole as the contrast pH detector, said process comprising following steps:
- step 1;
preparing various solid-state substrates and selecting an appropriate substrate based on the solid-state sensing material and the sensing environment;
step 2;
depositing a solid-state sensing material on said substrate;
step 3;
routing the device;
step 4;
using a epoxy resin to seal the material and fixing the sensing window area; and
step 5;
then immersing the device into a electro polymerizing solution, and electro-polymerizing polypyrrole, thus completing the fabrication of the whole solid-state pH sensing device.
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Abstract
A process for fabricating a whole solid-state pH sensing device by using the polypyrrole as the contrast pH detector and a whole solid-state pH sensing device fabricated by the process are disclosed, wherein said device is a differential pair framework potential electrochemical sensing device fabricated by using a non-insulating solid-state inorganic ion-sensing membrane and a polypyrrole sensing membrane. The largest difference between the device of the present invention and the conventional potentiometric type pH sensor is that the sensor of the invention is a solid-state planar sensor. The differential pair framework uses tin dioxide as the ion-sensing membrane and the reference electrode, and uses a polypyrrole sensor as the differential sensor, wherein the sensitivity of tin dioxide is good and has a value up to 57 mV/pH, and the sensitivity of polypyrrole is about 27 mV/pH. These lead the sensitivity of the whole solid-state pH Sensing device to a value of 30 mV/pH and exhibits good linearity, so that the sensing device framework has practicability. Since the sensitivity of the polypyrrole can be controlled by means of its polymerization, a sensing device with controllable sensitivity can be fabricated for applying to the fabrication of a pH sensor or a biosensor.
10 Citations
8 Claims
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1. A process for fabricating a whole solid-state pH sensing device by using polypyrrole as the contrast pH detector, said process comprising following steps:
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step 1;
preparing various solid-state substrates and selecting an appropriate substrate based on the solid-state sensing material and the sensing environment;
step 2;
depositing a solid-state sensing material on said substrate;
step 3;
routing the device;
step 4;
using a epoxy resin to seal the material and fixing the sensing window area; and
step 5;
then immersing the device into a electro polymerizing solution, and electro-polymerizing polypyrrole, thus completing the fabrication of the whole solid-state pH sensing device. - View Dependent Claims (2, 3, 4, 5)
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6. A process for fabricating a whole solid-state pH sensing device by using the polypyrrole as the contrast pH detector, said process comprises:
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depositing a non-insulating solid-state ion-sensing membrane on a insulating substrate or non-insulating substrate;
using a conductive wire as the signal transmission line;
using a seal material such as a epoxy resin to seal and coat the non-sensing area;
using encapsulation technology to define the sensing area of the sensing device to fabricate the pH sensor and the reference electrode;
thereafter, immerging the finished device into a polymerizing solution of polypyrrole, and polymerizing polypyrrole on a tin dioxide membrane, thus complete the fabrication of the polypyrrole sensor;
wherein by virtue of the electrode feature formed from three sensing windows, said differential pair electrochemical pH Sensing device is thus constructed. - View Dependent Claims (7, 8)
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Specification