CN102507699A - Normal-temperature electrochemical oxygen sensor and preparation method thereof - Google Patents

Abstract

The invention provides a normal-temperature electrochemical oxygen sensor and a preparing method thereof. The sensor comprises a ceramic substrate, two groups of air inlet through holes which are formed on the ceramic substrate, three gold leading wire layers which are cured on the ceramic substrate, platinum electrode layers which are cured on the three gold leading wire layers, Nafion solid electrolyte layers which are cured on the platinum electrode layers, and colloid protection layers which are cured on the electrolyte layers. A counter electrode and a working electrode are corresponding to the two groups of air inlet through holes respectively and arranged in a way of being covered. The preparation method of the normal-temperature electrochemical oxygen sensor comprises the steps of: forming two groups of air inlet through holes on the ceramic substrate; curing gold pastes on the ceramic substrate, forming three gold leading wire layers; curing platinum pastes on the three gold lead layers respectively, forming the platinum electrode layers, each of which is composed of the counter electrode, a reference electrode and the working electrode; and spraying to form the electrolyte layers and the colloid protection layers. The sensor disclosed by the invention is simple in structure, high in sensitivity, and free from lead pollution. The method disclosed by the invention is simple in process, easy in manufacturing and high in reliability.

Description

Normal temperature electrochemistry oxygen gas sensor and preparation method thereof

Technical field

The present invention relates to a kind of oxygen sensor, specifically, related to a kind of normal temperature electrochemistry oxygen gas sensor and preparation method thereof.

Background technology

Oxygen sensor detects principle, is used for detecting oxidized or the chemicals or the gas that decompose in chemical reaction based on electrochemical gas.At present; Normal temperature electrochemistry oxygen gas sensor on the market is lead-air galvanic cell type sensor; And lead is poisonous and harmful substance; The RoHS instruction of European Union is that the objectionable impurities illegal instruction was carried out in the whole Europe scope from July 1st, 2006, and will forbid in European Union from lead-air galvanic cell type sensor in 2016 comprehensively, and unleaded oxygen sensor plan meets the RoHS instruction of European Union fully; Therefore, developing unleaded oxygen sensor will be trend of the times, and it has met the RoHS instruction, can get around the RoHS barrier, helps to get into the European market.

Summary of the invention

The objective of the invention is deficiency to prior art; Thereby a kind of normal temperature electrochemistry oxygen gas sensor of simple in structure, highly sensitive, no lead contamination is provided, also provide a kind of technology simple, be easy to make, the preparation method of normal temperature electrochemistry oxygen gas sensor that reliability is high.

To achieve these goals; The technical scheme that the present invention adopted is: a kind of normal temperature electrochemistry oxygen gas sensor, it includes ceramic substrate, be arranged on two groups of air inlet through holes on the said ceramic substrate, three golden conductor layers, by the platinum electrode layer that electrode, contrast electrode and working electrode are constituted, Nafion solid electrolyte layer and colloid protective seam; Wherein, three said golden conductor layers are solidificated in respectively on the said ceramic substrate, wherein two said golden conductor layers hole of being separately positioned on two groups of said air inlet through holes along around the position; Said platinum electrode layer electrode, contrast electrode and working electrode are solidificated in respectively on three said golden conductor layers, said to electrode and corresponding two groups of said air inlet through holes and the covering setting respectively of said working electrode; Said Nafion solid electrolyte layer is solidificated on the said platinum electrode layer, and said colloid protective seam is solidificated on the said Nafion solid electrolyte layer.

Based on above-mentioned, said ceramic substrate adopts small-sized sheet ceramic substrate structure.

A kind of preparation method of normal temperature electrochemistry oxygen gas sensor, it may further comprise the steps:

Step 1, on said ceramic substrate, use laser-beam drilling machine to make two groups of air inlet through holes;

Step 2, with the gold paste material through the printing or spraying method be solidificated on the said ceramic substrate, form three said golden conductor layers, wherein, under 650 ℃～1100 ℃, be cured processing, be 30 minutes～90 minutes set time;

Step 3, with the platinum slurry through the printing or spraying method be solidificated in respectively on three said golden conductor layers; Formation is by the platinum electrode layer that electrode, contrast electrode and working electrode are constituted; Wherein, under 50 ℃～300 ℃, be cured processing, be 30 minutes～90 minutes set time;

Step 4, Nafion solution is solidificated on the said platinum electrode layer through spraying method, forms said Nafion solid electrolyte layer, wherein, under 50 ℃～80 ℃, be cured processing, be 10 minutes～90 minutes set time;

Step 5, epoxy resin glue is solidificated on the said Nafion solid electrolyte layer through spraying method, forms said colloid protective seam, get final product.

The relative prior art of the present invention has outstanding substantive distinguishing features and marked improvement, and specifically, the present invention has the following advantages:

1, conductor layer and electrode layer are selected Precious Metals-Gold and platinum respectively for use, avoid the use of heavy metal lead, have stopped lead contamination; Solid electrolyte adopts the Nafion material, does not have dangerous, easy to operate;

2, this preparation method mainly adopts the mode of production of slurry printing or spraying, and technology is simple, is easy to make, and product stability and consistance are more easy to control;

3, Precious Metals-Gold, platinum and the Nafion solid electrolyte of this sensor use are the material of on-consumable type in this sensor systems, make that the life-span of sensor is longer.

Description of drawings

Fig. 1 is the structural representation of said normal temperature electrochemistry oxygen gas sensor.

Embodiment

Through embodiment, technical scheme of the present invention is done further detailed description below.

As shown in Figure 1; A kind of normal temperature electrochemistry oxygen gas sensor, it includes ceramic substrate 1, be arranged on air inlet through hole 21 and air inlet through hole 22 on the said ceramic substrate 1, include the conductor layer of golden conductor layer 31, golden conductor layer 32, golden conductor layer 33, by the platinum electrode layer that electrode 41, contrast electrode 43 and working electrode 42 are constituted, Nafion solid electrolyte layer 5 and colloid protective seam 6;

Wherein, three said golden conductor layers are solidificated in respectively on the said ceramic substrate 1, wherein, said golden conductor layer 31, said golden conductor layer 32 is corresponding respectively and the hole that is arranged on said air inlet through hole 21 and said air inlet through hole 22 along around the position;

Said platinum electrode layer corresponding respectively and be solidificated on said golden conductor layer 31, said golden conductor layer 33, the said golden conductor layer 32 to electrode 41, contrast electrode 43 and working electrode 42, said to electrode 41 and the corresponding respectively said air inlet through hole 21 of said working electrode 42 with said air inlet through hole 22 and cover and be provided with;

Said Nafion solid electrolyte layer 5 is solidificated on the said platinum electrode layer, and said colloid protective seam 6 is solidificated on the said Nafion solid electrolyte layer 5;

Said ceramic substrate 1 adopts small-sized sheet ceramic substrate structure.

A kind of preparation method of normal temperature electrochemistry oxygen gas sensor, it may further comprise the steps:

Step 1, on said ceramic substrate, use laser-beam drilling machine to make two groups of air inlet through holes;

Step 2, with the gold paste material through the printing or spraying method be solidificated on the said ceramic substrate, form three said golden conductor layers, wherein, under 650 ℃～1100 ℃, be cured processing, be 30 minutes～90 minutes set time;

Step 3, with the platinum slurry through the printing or spraying method be solidificated in respectively on three said golden conductor layers; Formation is by the platinum electrode layer that electrode, contrast electrode and working electrode are constituted; Wherein, under 50 ℃～300 ℃, be cured processing, be 30 minutes～90 minutes set time;

Step 4, Nafion solution is solidificated on the said platinum electrode layer through spraying method, forms said Nafion solid electrolyte layer, wherein, under 50 ℃～80 ℃, be cured processing, be 10 minutes～90 minutes set time;

Step 5, epoxy resin glue is solidificated on the said Nafion solid electrolyte layer through spraying method, forms said colloid protective seam, get final product.

Should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not to its restriction; Although with reference to preferred embodiment the present invention has been carried out detailed explanation, the those of ordinary skill in affiliated field is to be understood that: still can specific embodiments of the invention make amendment or the part technical characterictic is equal to replacement; And not breaking away from the spirit of technical scheme of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.

Claims (3)

1. normal temperature electrochemistry oxygen gas sensor is characterized in that: it includes ceramic substrate, be arranged on two groups of air inlet through holes on the said ceramic substrate, three golden conductor layers, by the platinum electrode layer that electrode, contrast electrode and working electrode are constituted, Nafion solid electrolyte layer and colloid protective seam; Wherein, three said golden conductor layers are solidificated in respectively on the said ceramic substrate, wherein two said golden conductor layers hole of being separately positioned on two groups of said air inlet through holes along around the position; Said platinum electrode layer electrode, contrast electrode and working electrode are solidificated in respectively on three said golden conductor layers, said to electrode and corresponding two groups of said air inlet through holes and the covering setting respectively of said working electrode; Said Nafion solid electrolyte layer is solidificated on the said platinum electrode layer, and said colloid protective seam is solidificated on the said Nafion solid electrolyte layer.

2. normal temperature electrochemistry oxygen gas sensor according to claim 1 is characterized in that: said ceramic substrate adopts small-sized sheet ceramic substrate structure.

3. the preparation method of the described normal temperature electrochemistry oxygen of claim 1 gas sensor, it is characterized in that: this preparation method may further comprise the steps:

Step 1, on said ceramic substrate, use laser-beam drilling machine to make two groups of air inlet through holes;

Step 2, with the gold paste material through the printing or spraying method be solidificated on the said ceramic substrate, form three said golden conductor layers, wherein, under 650 ℃～1100 ℃, be cured processing, be 30 minutes～90 minutes set time;

Step 3, with the platinum slurry through the printing or spraying method be solidificated in respectively on three said golden conductor layers; Formation is by the platinum electrode layer that electrode, contrast electrode and working electrode are constituted; Wherein, under 50 ℃～300 ℃, be cured processing, be 30 minutes～90 minutes set time;

Step 4, Nafion solution is solidificated on the said platinum electrode layer through spraying method, forms said Nafion solid electrolyte layer, wherein, under 50 ℃～80 ℃, be cured processing, be 10 minutes～90 minutes set time;

Step 5, epoxy resin glue is solidificated on the said Nafion solid electrolyte layer through spraying method, forms said colloid protective seam, get final product.

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