CN108982592B - Preparation method of high-sensitivity plant ash-based humidity sensor - Google Patents
Preparation method of high-sensitivity plant ash-based humidity sensor Download PDFInfo
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- CN108982592B CN108982592B CN201810789274.1A CN201810789274A CN108982592B CN 108982592 B CN108982592 B CN 108982592B CN 201810789274 A CN201810789274 A CN 201810789274A CN 108982592 B CN108982592 B CN 108982592B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000007639 printing Methods 0.000 claims abstract description 14
- 239000000758 substrate Substances 0.000 claims abstract description 9
- 238000007650 screen-printing Methods 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 229920001721 polyimide Polymers 0.000 claims abstract description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 10
- 238000000137 annealing Methods 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 229920001131 Pulp (paper) Polymers 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000012153 distilled water Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 229910052573 porcelain Inorganic materials 0.000 claims description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 5
- 238000005245 sintering Methods 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 12
- 239000000463 material Substances 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 abstract 2
- 239000002956 ash Substances 0.000 description 40
- 241000196324 Embryophyta Species 0.000 description 36
- 238000012360 testing method Methods 0.000 description 6
- 241000202567 Fatsia japonica Species 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000001878 scanning electron micrograph Methods 0.000 description 4
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000013473 artificial intelligence Methods 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
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- 238000011112 process operation Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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Abstract
The invention relates to a preparation method of a high-sensitivity plant ash-based humidity sensor, which is characterized in that an interdigital electrode is printed on the surface of a flexible PI (polyimide) film by screen printing to prepare a substrate, plant ash left after printing paper and napkin paper are burnt and annealed is used as a humidity sensitive material, and the humidity sensor is prepared by dripping the plant ash on the interdigital electrode substrate. The invention has the advantages of wide raw material source, capability of changing waste into valuable, improvement on resource utilization efficiency, simple and convenient preparation process, low cost, simplicity, greenness, cost benefit and sustainability, and the prepared humidity sensor has six orders of magnitude (10) at room temperature6) The ultra-high sensitivity of (2).
Description
Technical Field
The invention relates to the field of gas-humidity-sensitive sensors, in particular to a preparation method of a high-sensitivity plant ash-based humidity sensor.
Background
As an important parameter of environmental quality, relative humidity plays a crucial role in human life, food safety and industrial processes. In recent years, flexible and wearable humidity sensors for environmental monitoring and personal health monitoring have attracted a great deal of attention due to the development of artificial intelligence technology. Therefore, many nanomaterials, such as metal oxide semiconductors, polymers and carbon-based materials, have been explored to develop new humidity sensors. However, the synthesis of these materials requires expensive production costs, long preparation cycles, complicated processes and strong dependence of equipment. In particular, environmental pollution inevitably occurs during the preparation process, which not only wastes energy and time, but also further limits their practical applications. Therefore, it is of great significance to develop a cost-effective, green, sustainable and energy-saving humidity sensor preparation method.
Disclosure of Invention
The invention aims to provide a humidity sensor which is prepared by printing interdigital electrodes on the surface of a flexible PI (polyimide) film by adopting screen printing to prepare a substrate, taking plant ash left after printing paper and napkin paper are burnt and annealed as sensitive materials and simply dripping the sensitive materials on the interdigital electrode substrate.
To solve the above technical problems/to achieve the above object, the present invention provides a technical solution:
a preparation method of a high-sensitivity plant ash-based humidity sensor comprises the following steps:
(1) selecting common raw wood pulp as a raw material;
(2) burning the raw wood pulp and collecting plant ash left after burning;
(3) putting a proper amount of the obtained plant ash into a porcelain boat, and annealing in a box-type furnace to obtain annealed plant ash;
(4) printing an interdigital electrode matrix on the surface of a flexible PI (polyimide) film by using a screen printing method and conductive silver paste as slurry, and sintering and drying for later use;
(5) dispersing the plant ash prepared in the step (2) or the annealed plant ash prepared in the step (3) in distilled water, then, dripping the distilled water on the interdigital electrode substrate prepared in the step (4), and drying;
(6) and connecting the interdigital electrode with a platinum wire by using conductive silver paste to finish the preparation of the humidity sensor.
The raw wood pulp is printing paper or napkin paper.
In the step (3), the annealing condition is that the box furnace anneals for 2 hours at 800 ℃, and the heating rate is 10 ℃/min.
The inter-digital electrode spacing is 300 μm.
Compared with the prior art, the invention has the beneficial effects that:
(1) the preparation process of the humidity sensor does not depend on large-scale equipment, the process operation is simple, the production cost is low, no pollution is caused, and the preparation method of the humidity sensor is simple, green, cost-effective and sustainable.
(2) The humidity sensor uses plant ash as raw material, has wide raw material source, and is suitable for industrial mass production.
(3) The resource utilization efficiency is improved, the waste of paper can be changed into valuable, and the waste of wood resources and the environmental pollution are reduced.
(4) The humidity sensor prepared by the invention has six orders of magnitude (10) at room temperature6) The ultra-high sensitivity of (2).
Drawings
FIG. 1 is a diagram of screen printing to prepare interdigital electrodes.
Fig. 2 is an SEM image of plant ash obtained by burning printing paper.
Fig. 3 is an SEM image of plant ash obtained by annealing printing paper.
FIG. 4 is an SEM image of plant ash obtained by burning a napkin.
FIG. 5 is an SEM image of plant ash obtained by annealing a napkin.
FIG. 6 is a graph of the sensitivity of four different plant ashes to different relative humidities.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 2
First, clean raw wood pulp printing paper is taken and the remaining plant ash is ignited and collected in the air. And (3) placing the plant ash into a porcelain boat, placing the porcelain boat into a box furnace, annealing in air atmosphere, wherein the heating rate is 10 ℃/min, and annealing for 2 hours at 800 ℃. And then, printing interdigital electrodes with the electrode spacing of 300 mu m on the PI film by using a screen printing method and conductive silver paste as slurry, and sintering and drying for later use. And dispersing the obtained plant ash in distilled water, dripping the plant ash on an interdigital electrode substrate, and drying. And finally, connecting the interdigital electrode with a platinum wire by using conductive silver paste to finish the preparation of the humidity sensor. The prepared plant ash-based humidity sensor was subjected to a humidity sensitivity test at room temperature, the relative humidity range of the test was 15% to 90%, the operating voltage was 2V, and the results are shown in fig. 6 (b).
Example 3
First, clean raw wood pulp napkin is taken and the plant ash left over is ignited and collected in the air. And printing interdigital electrodes with the electrode spacing of 300 mu m on the PI film by adopting a screen printing method and taking conductive silver paste as slurry, and sintering and drying for later use. And dispersing the obtained plant ash in distilled water, dripping the plant ash on an interdigital electrode substrate, and drying. And finally, connecting the interdigital electrode with a platinum wire by using conductive silver paste to finish the preparation of the humidity sensor. The prepared plant ash-based humidity sensor was subjected to a humidity sensitivity test at room temperature, the relative humidity range of the test was 15% to 90%, the operating voltage was 2V, and the results are shown in fig. 6 (c).
Example 4
First, clean raw wood pulp napkin is taken and the plant ash left over is ignited and collected in the air. And (3) placing the plant ash into a porcelain boat, placing the porcelain boat into a box furnace, annealing in air atmosphere, wherein the heating rate is 10 ℃/min, and annealing for 2 hours at 800 ℃. And then, printing interdigital electrodes with the electrode spacing of 300 mu m on the PI film by using a screen printing method and conductive silver paste as slurry, and sintering and drying for later use. And dispersing the obtained plant ash in distilled water, dripping the plant ash on an interdigital electrode substrate, and drying. And finally, connecting the interdigital electrode with a platinum wire by using conductive silver paste to finish the preparation of the humidity sensor. The prepared plant ash-based humidity sensor was subjected to a humidity sensitivity test at room temperature, the relative humidity range of the test was 15% to 90%, the operating voltage was 2V, and the results are shown in fig. 6 (d).
FIG. 6 is a graph of the sensitivity of four different plant ashes to different relative humidities. It can be seen from the figure that: the annealed paper plant ash (fig. 6(b)) has a higher humidity sensitivity than the unannealed paper plant ash (fig. 6(a)) and has some sensitivity to lower relative humidity (15% -30% RH). The annealed napkin plant ash (fig. 6(d)) has a higher humidity sensitivity than the unannealed napkin plant ash (fig. 6(c)) and a higher sensitivity to lower relative humidity (15% -44% RH). In addition, annealed napkin plant ash has a higher humidity response to different relative humidities, up to six orders of magnitude (10) than annealed paper plant ash6). In summary, the annealed plant ash possesses a higher humidity response than the unannealed plant ash, and the annealed napkin plant ash has a higher humidity sensitivity than the annealed printing paper plant ash.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention in any way, and any person skilled in the art can make any simple modification, equivalent replacement, and improvement on the above embodiment without departing from the technical spirit of the present invention, and still fall within the protection scope of the technical solution of the present invention.
Claims (2)
1. A preparation method of a high-sensitivity plant ash-based humidity sensor is characterized by comprising the following steps: the method comprises the following steps:
(1) selecting common raw wood pulp as a raw material;
(2) burning the raw wood pulp and collecting plant ash left after burning;
(3) putting a proper amount of the obtained plant ash into a porcelain boat, and annealing in a box-type furnace to obtain annealed plant ash;
(4) printing an interdigital electrode matrix on the surface of the flexible polyimide film by using a screen printing method and conductive silver paste as slurry, and sintering and drying for later use;
(5) dispersing the plant ash prepared in the step (2) or the annealed plant ash prepared in the step (3) in distilled water, then, dripping the distilled water on the interdigital electrode substrate prepared in the step (4), and drying;
(6) connecting the interdigital electrode with a platinum wire by using conductive silver paste to finish the preparation of the humidity sensor;
in the step (3), the annealing condition is that the box furnace anneals for 2 hours at 800 ℃, and the heating rate is 10 ℃/min;
the inter-digital electrode spacing is 300 μm.
2. The method for preparing the high-sensitivity plant ash-based humidity sensor according to claim 1, wherein the method comprises the following steps: the raw wood pulp is printing paper or napkin paper.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS582731A (en) * | 1981-06-30 | 1983-01-08 | Anritsu Corp | Moisture sensitive element |
| CN103558264A (en) * | 2013-10-11 | 2014-02-05 | 常州大学 | Method for preparing high sensitive humidity sensor |
| CN104356567A (en) * | 2014-10-27 | 2015-02-18 | 东华大学 | Method for preparing humidity-sensitive switch flexible sensing material |
| CN106841331A (en) * | 2017-04-05 | 2017-06-13 | 成都信息工程大学 | A kind of flexible capacitance type humidity sensor and preparation method thereof |
| CN107402242A (en) * | 2017-08-01 | 2017-11-28 | 南京航空航天大学 | Surface modification titanium deoxid film gas sensor and preparation method thereof |
| CN108169295A (en) * | 2017-10-30 | 2018-06-15 | 上海幂方电子科技有限公司 | Flexible humidity sensor and preparation method thereof |
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2018
- 2018-07-18 CN CN201810789274.1A patent/CN108982592B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS582731A (en) * | 1981-06-30 | 1983-01-08 | Anritsu Corp | Moisture sensitive element |
| CN103558264A (en) * | 2013-10-11 | 2014-02-05 | 常州大学 | Method for preparing high sensitive humidity sensor |
| CN104356567A (en) * | 2014-10-27 | 2015-02-18 | 东华大学 | Method for preparing humidity-sensitive switch flexible sensing material |
| CN106841331A (en) * | 2017-04-05 | 2017-06-13 | 成都信息工程大学 | A kind of flexible capacitance type humidity sensor and preparation method thereof |
| CN107402242A (en) * | 2017-08-01 | 2017-11-28 | 南京航空航天大学 | Surface modification titanium deoxid film gas sensor and preparation method thereof |
| CN108169295A (en) * | 2017-10-30 | 2018-06-15 | 上海幂方电子科技有限公司 | Flexible humidity sensor and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| Improving the humidity sensing below 30% RH of TiO2 with GO Modification;Linchao Sun;《Materials Research Bulletin》;20171103;全文 * |
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