技术领域technical field
本发明涉及人体健康监测技术领域，尤其是基于喷墨打印技术的需要用到微型的柔性压力传感器的可穿戴设备的制备方法，具体是一种柔性无线压力检测系统的制备方法。The invention relates to the technical field of human health monitoring, in particular to a method for preparing a wearable device based on inkjet printing technology that needs to use a miniature flexible pressure sensor, in particular a method for preparing a flexible wireless pressure detection system.
背景技术Background technique
可穿戴设备正如雨后春笋一般迅速发展，但是其中大多数元件，甚至包括传感器、通讯天线都不是柔性的，因此可穿戴设备的体积和功耗都受到了很大限制。如果实现真正的柔性，必然能让可穿戴设备能更贴合人体，体积更小，应用领域更广阔。虽然已有技术文章以及专利报道实现柔性传感器的方法，如《基于柔性基板的具有自封装功能的无源无线压力传感器》报道了一种组装无线压力传感器的方法，但其本质金属电感线圈与柔性衬底是分离的。其他可穿戴领域的设备也存在同样的问题，他们只是把传感器和信号传输部分做得足够小巧，而不是足够柔软。Wearable devices are developing rapidly like mushrooms after rain, but most of the components, even sensors and communication antennas, are not flexible, so the size and power consumption of wearable devices are greatly limited. If real flexibility is realized, it will inevitably make wearable devices more suitable for the human body, smaller in size, and wider in application fields. Although existing technical articles and patents report methods for realizing flexible sensors, such as "A passive wireless pressure sensor with self-encapsulation function based on flexible substrates" reports a method for assembling wireless pressure sensors, but its essence is metal inductive coils and flexible sensors. The substrate is separated. Other devices in the wearable field also have the same problem, they just make the sensor and signal transmission part small enough, not soft enough.
发明内容Contents of the invention
本发明的目的是针对现有可穿戴设备的“假柔性”提出了一种基于喷墨打印技术的柔性无线压力检测系统的制备方法，该方法在一块柔性衬底上集成传感器、天线等，从而实现一体化的可穿戴设备。The purpose of the present invention is to propose a preparation method of a flexible wireless pressure detection system based on inkjet printing technology for the "pseudo-flexibility" of existing wearable devices. This method integrates sensors, antennas, etc. on a flexible substrate, thereby Achieving an all-in-one wearable device.
实现本发明目的的具体技术方案是：The concrete technical scheme that realizes the object of the invention is:
一种基于喷墨打印技术的柔性无线压力检测系统的制备方法，特点是该方法包括以下具体步骤：A method for preparing a flexible wireless pressure detection system based on inkjet printing technology, characterized in that the method includes the following specific steps:
步骤1：制备柔性压力传感器Step 1: Fabricate a Flexible Pressure Sensor
S1：将工业级石墨烯粉末和氧化石墨烯粉末分散在无水乙醇溶液中，保持浓度为0.01-2mg/mL，以300W超声剥离0.5-1小时，再以3500-4000转/分钟的转速离心8-10分钟，提取上清液，使之均匀分散，得到石墨烯—氧化石墨烯混合溶液；S1: Disperse industrial-grade graphene powder and graphene oxide powder in absolute ethanol solution, keep the concentration at 0.01-2mg/mL, use 300W ultrasonic stripping for 0.5-1 hour, and then centrifuge at 3500-4000 rpm 8-10 minutes, extract the supernatant, make it evenly dispersed, and obtain the graphene-graphene oxide mixed solution;
S2：经混合纤维滤膜将制得的石墨烯—氧化石墨烯混合溶液倒入抽滤装置中，通过混合纤维滤膜将乙醇溶剂过滤掉，在混合纤维滤膜上得到石墨烯—氧化石墨烯混合薄膜，将混合纤维滤膜与石墨烯—氧化石墨烯混合薄膜取出，烘干，再用丙酮溶剂将混合纤维滤膜溶解，得到石墨烯—氧化石墨烯混合薄膜，60℃将该混合薄膜烘干，得到混合压敏薄膜即柔性压力传感器；S2: Pour the prepared graphene-graphene oxide mixed solution into the suction filtration device through the mixed fiber filter membrane, filter the ethanol solvent through the mixed fiber filter membrane, and obtain graphene-graphene oxide on the mixed fiber filter membrane Mixed film, take out the mixed fiber filter membrane and graphene-graphene oxide mixed film, dry, then dissolve the mixed fiber filter membrane with acetone solvent to obtain a graphene-graphene oxide mixed film, bake the mixed film at 60 °C dry to obtain a hybrid pressure-sensitive film that is a flexible pressure sensor;
步骤2：制备银质电路及柔性天线Step 2: Prepare silver circuit and flexible antenna
S1：表面改性S1: surface modification
将洁净、干燥的聚酰亚胺薄膜放入碱溶液中，25℃恒温下浸泡2.5-3小时，用去离子水清洗，去除聚酰亚胺薄膜表面残留碱金属离子，得到洁净的、表面为聚酰胺酸盐的薄膜；其中，碱溶液浓度为4mol/L；Put the clean and dry polyimide film into the alkaline solution, soak it at a constant temperature of 25°C for 2.5-3 hours, wash it with deionized water, remove the residual alkali metal ions on the surface of the polyimide film, and obtain a clean surface with a The film of polyamic acid salt; Wherein, alkali solution concentration is 4mol/L;
S2：离子交换S2: ion exchange
将聚酰胺酸盐的薄膜放入银氨溶液中，使之与银氨溶液充分接触并浸泡10-40分钟，用去离子水清洗，去除聚酰亚胺表面残留的溶液，得到表面为银离子—聚酰亚胺络合物的薄膜；其中，银氨溶液浓度为0.01-0.04mol/L；Put the film of polyamic acid salt into the silver ammonia solution, make it fully contact with the silver ammonia solution and soak for 10-40 minutes, wash with deionized water, remove the solution remaining on the surface of the polyimide, and obtain a surface with silver ions -The film of polyimide complex; Wherein, the silver ammonia solution concentration is 0.01-0.04mol/L;
S3：掩模打印S3: Mask printing
将银离子—聚酰亚胺络合物的薄膜平整得贴在A4纸上，通过喷墨打印机将设计好的电路及天线掩模图案打印在该薄膜表面；Paste the film of silver ion-polyimide complex flatly on A4 paper, and print the designed circuit and antenna mask pattern on the surface of the film by inkjet printer;
S4：还原S4: restore
将打印有图案的薄膜平整放置，在200毫升去离子水中加入浓度为30%的双氧水1毫升，配置成溶液滴于打印有图案的薄膜上，还原、生成银质电路及柔性天线；Place the patterned film on a flat surface, add 1 ml of 30% hydrogen peroxide to 200 ml of deionized water, make a solution and drop it on the patterned film to restore and generate silver circuits and flexible antennas;
步骤3：制备柔性无线压力检测系统Step 3: Prepare a flexible wireless pressure detection system
S1：将柔性压力传感器与银质电路及柔性天线连接，将处理电路连接铜质线圈及显示终端，柔性天线及银质电路通过电磁感应与铜质线圈耦合，在5～30cm无线连接；得到柔性无线压力检测系统。S1: Connect the flexible pressure sensor with the silver circuit and the flexible antenna, connect the processing circuit with the copper coil and the display terminal, the flexible antenna and the silver circuit are coupled with the copper coil through electromagnetic induction, and connect wirelessly at 5-30cm; Wireless pressure detection system.
所述处理电路由阻抗匹配模块、WiFi传输模块组成，铜质线圈通过导线直接与阻抗匹配模块相连，将结果通过WiFi模块发送到显示设备接收。The processing circuit is composed of an impedance matching module and a WiFi transmission module. The copper coil is directly connected to the impedance matching module through wires, and the result is sent to the display device for reception through the WiFi module.
所述柔性压力传感器电阻值随压力增大而减小。The resistance value of the flexible pressure sensor decreases as the pressure increases.
所述碱溶液为氢氧化钠或氢氧化钾溶液。The alkali solution is sodium hydroxide or potassium hydroxide solution.
所述柔性天线为平面矩形螺旋形状，线宽为0.4-.06mm，间距为0.2-0.4mm，整体尺寸从0.75cm*1.5cm到1.5cm*3cm，工作频率在100MHz-1GHz，优选尺寸为1.5cm*3cm，工作频率为170MHz，可以满足压力数值信号的实时、无线传输。The flexible antenna is in the shape of a planar rectangular spiral, with a line width of 0.4-.06mm, a spacing of 0.2-0.4mm, an overall size of 0.75cm*1.5cm to 1.5cm*3cm, and a working frequency of 100MHz-1GHz. The preferred size is 1.5 cm*3cm, the working frequency is 170MHz, which can meet the real-time and wireless transmission of pressure value signals.
所述银质电路充当柔性导线的作用，将各个部件连接在一起，本身的形状、图案只要符合电路要求即可，没有特殊要求。The silver circuit acts as a flexible wire and connects the various components together. The shape and pattern of the silver circuit only need to meet the requirements of the circuit, and there is no special requirement.
本发明通过柔性的碳基传感器感受压力，随压力增大而减小自身电阻，改变电路的电学性质，使柔性天线发射信号的电流大小发生改变，检测发射信号的变化可以推测压力值的大小。柔性压力传感器、天线及银质电路可以任意弯曲、折叠，甚至粘贴在皮肤表面而不影响工作性能与准确性。本发明可以采集、传输并处理机械电信号。金属图形化过程可用普通喷墨打印机打印，成本低，得到的银质电路连续、致密、电导率高；压力敏感单元与银质电路以及柔性衬底之间结合力强、压力响应频率达10000赫兹、压力响应范围从10帕斯卡到1兆帕斯卡；柔性天线信号采集、传输可在0.02秒内完成压力响应及传输；柔性设备稳定性强，弯曲疲劳测试表明，整个系统在重复测试10000次后，仍保持电路特性的稳定。因此可以整合至绝大多数可穿戴设备，进一步减小体积、降低功耗、增强可靠性、延长寿命。The invention senses the pressure through the flexible carbon-based sensor, reduces its own resistance as the pressure increases, changes the electrical properties of the circuit, and changes the current of the signal transmitted by the flexible antenna. The pressure value can be estimated by detecting the change of the transmitted signal. Flexible pressure sensors, antennas and silver circuits can be bent, folded, or even pasted on the surface of the skin without affecting work performance and accuracy. The invention can collect, transmit and process mechanical and electrical signals. The metal patterning process can be printed by ordinary inkjet printers, and the cost is low. The obtained silver circuit is continuous, dense and has high conductivity; the pressure sensitive unit has strong bonding force with the silver circuit and flexible substrate, and the pressure response frequency reaches 10,000 Hz , The pressure response range is from 10 Pascal to 1 MPa; the flexible antenna signal acquisition and transmission can complete the pressure response and transmission within 0.02 seconds; the flexible device has strong stability. Keep the circuit characteristics stable. Therefore, it can be integrated into most wearable devices to further reduce size, reduce power consumption, enhance reliability, and prolong life.
附图说明Description of drawings
图1为本发明结构示意图；Fig. 1 is a structural representation of the present invention;
图2为本发明柔性压力传感器制作流程图；Fig. 2 is a flow chart of making the flexible pressure sensor of the present invention;
图3为本发明银质电路及柔性天线制备流程图；Fig. 3 is the flow chart of preparation of silver circuit and flexible antenna of the present invention;
图4为本发明柔性压力传感器电阻变化与压力关系曲线图；Fig. 4 is a curve diagram of the relationship between resistance change and pressure of the flexible pressure sensor of the present invention;
图5为本发明柔性压力传感器的疲劳测试结果图。Fig. 5 is a diagram of fatigue test results of the flexible pressure sensor of the present invention.
具体实施方式detailed description
下面结合附图及实施例对本发明作详细描述。The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
实施例Example
参阅图1，本发明包括：柔性压力传感器1、柔性银质电路及天线2、铜质线圈3、由阻抗匹配模块及WiFi芯片组成的处理电路4及显示终端5，柔性压力传感器1与柔性银质电路及天线2连接；处理电路4连接铜质线圈3及显示终端5，柔性银质电路及天线2通过电磁感应与铜质线圈3耦合，在5～30cm无线连接。铜质线圈3接收信号，由处理电路4进行模数转化，将数字信号通过WiFi芯片处理输出至显示终端，通过铜质线圈感应到的信号变化由Referring to Fig. 1, the present invention includes: a flexible pressure sensor 1, a flexible silver circuit and an antenna 2, a copper coil 3, a processing circuit 4 composed of an impedance matching module and a WiFi chip, and a display terminal 5, the flexible pressure sensor 1 and the flexible silver The processing circuit 4 is connected to the copper coil 3 and the display terminal 5, the flexible silver circuit and the antenna 2 are coupled to the copper coil 3 through electromagnetic induction, and are connected wirelessly within 5-30 cm. The copper coil 3 receives the signal, and the processing circuit 4 performs analog-to-digital conversion, and the digital signal is processed and output to the display terminal through the WiFi chip, and the signal change induced by the copper coil is determined by
计算柔性压力传感器1承受压力的变化。Calculate the change of the pressure that the flexible pressure sensor 1 bears.
在柔性压力传感器1端施加压力，柔性压力传感器1因压力产生形变，导致自身电阻变小，使柔性压力传感器-柔性银质电路及天线这部分总电阻减小，柔性天线所发射的无线信号发生改变，铜质线圈3对柔性电路发射电信号的耦合，得到一个随柔性电路中电阻变化而变化的电流信号，通过处理电路4，将连续的电流信号（模拟信号）转换为简短的数字信号并通过芯片发送至显示终端，对数据进行处理，计算出压力传感器承受压力的数值。When pressure is applied to the end of the flexible pressure sensor 1, the flexible pressure sensor 1 is deformed due to the pressure, resulting in a decrease in its own resistance, which reduces the total resistance of the flexible pressure sensor-flexible silver circuit and antenna, and the wireless signal emitted by the flexible antenna. Change, the copper coil 3 couples the electrical signal emitted by the flexible circuit to obtain a current signal that changes with the resistance in the flexible circuit. Through the processing circuit 4, the continuous current signal (analog signal) is converted into a short digital signal and Send it to the display terminal through the chip, process the data, and calculate the pressure value of the pressure sensor.
参阅图2，本实施例柔性的碳基压力传感器1的制备：将工业级石墨烯粉末和氧化石墨烯粉末分散在无水乙醇溶液中，保持浓度为2.0mg/mL，以300W超声剥离1小时，再以4000转/分钟的转速离心10分钟，提取上清液，使之均匀分散，得到石墨烯—氧化石墨烯混合溶液8。Referring to Fig. 2, the preparation of the flexible carbon-based pressure sensor 1 of this embodiment: disperse the industrial-grade graphene powder and graphene oxide powder in the absolute ethanol solution, keep the concentration at 2.0 mg/mL, and use 300W ultrasonic peeling for 1 hour , and then centrifuged at a speed of 4000 rpm for 10 minutes to extract the supernatant and disperse it evenly to obtain a graphene-graphene oxide mixed solution 8.
经混合纤维滤膜7将制得的石墨烯—氧化石墨烯混合溶液8倒入抽滤装置6中，通过混合纤维滤膜7将乙醇溶剂过滤掉，在混合纤维滤膜7上得到石墨烯—氧化石墨烯混合薄膜9，将混合纤维滤膜7与石墨烯—氧化石墨烯混合薄膜取出，烘干，再用丙酮溶剂将混合纤维滤膜7溶解，得到石墨烯—氧化石墨烯混合薄膜9，60℃将该混合薄膜烘干，可加工成任意形状、任意大小的柔性压力传感器10。Pour the prepared graphene-graphene oxide mixed solution 8 into the suction filtration device 6 through the mixed fiber filter membrane 7, filter the ethanol solvent through the mixed fiber filter membrane 7, and obtain graphene-graphene on the mixed fiber filter membrane 7. Graphene oxide mixed film 9, take out mixed fiber filter membrane 7 and graphene-graphene oxide mixed film, dry, then dissolve mixed fiber filter membrane 7 with acetone solvent, obtain graphene-graphene oxide mixed film 9, The mixed film is dried at 60° C., and can be processed into a flexible pressure sensor 10 of any shape and size.
由于团聚现象，真空抽滤法得到的石墨烯层表面较蓬松，受到压力时，蓬松的石墨烯变得致密，使得石墨烯层本身的电阻率减小，同时由于受到压力作用，石墨烯层与银电极的接触电阻也会减小，故该压力传感器在受到压力作用时电阻减小。释放压力后，紧密的石墨烯又恢复了原先蓬松的结构，电阻也随之增大，因此制成的压力传感器具有压敏效应。Due to the agglomeration phenomenon, the surface of the graphene layer obtained by the vacuum filtration method is relatively fluffy, and when the pressure is applied, the fluffy graphene becomes dense, so that the resistivity of the graphene layer itself decreases, and at the same time, due to the effect of pressure, the graphene layer and The contact resistance of the silver electrode also decreases, so the pressure sensor decreases in resistance when subjected to pressure. After the pressure is released, the compact graphene returns to its original fluffy structure, and the resistance increases accordingly, so the pressure sensor made has a pressure-sensitive effect.
所述压力传感器中氧化石墨烯的作用是帮助石墨烯分散成膜，并提高整体的机械强度、耐磨性。The function of graphene oxide in the pressure sensor is to help graphene to disperse and form a film, and improve the overall mechanical strength and wear resistance.
本实施例的压力传感器具有以下特点：The pressure sensor of this embodiment has the following characteristics:
1）完柔性，可任意弯曲、折叠而不影响其功能；1) Complete flexibility, can be bent and folded without affecting its function;
2）混合膜厚度仅200~500微米，极其轻薄，可集成在各种电路；2) The thickness of the hybrid film is only 200~500 microns, which is extremely light and thin, and can be integrated in various circuits;
3）能制作成任意形状，方便整合到各类设备中；3) Can be made into any shape, easy to integrate into various equipment;
4）电阻式压力传感器，能够响应静态、动态压力；4) Resistive pressure sensor, capable of responding to static and dynamic pressure;
5）对动态压力响应快，能够达到10000的响应频率。5) Fast response to dynamic pressure, capable of reaching a response frequency of 10,000.
参阅图4，柔性压力传感器电阻变化与压力关系曲线图，为检测该压力传感器电阻变化与压力关系，在传感器两端施加最小值为0牛顿、最大值为10牛顿的理想方波（即上升时间和下降时间均为0），对输出电流进行检测。绘制曲线图如图4。从图中可以看出，该压力传感器能随压力变化而改变自身电阻，影响电路中电流变化。且电路中电流变化规律与施加压力变化规律相同，从一方面证实了传感器的可用性。另外，从实验结果可以看出电流变化响应时间短，施加压力改变后电流立刻变化，反应在图中为电流图形是与压力图形类似的方波。Refer to Figure 4, the curve diagram of the relationship between the resistance change and pressure of the flexible pressure sensor. In order to detect the relationship between the resistance change and pressure of the pressure sensor, an ideal square wave with a minimum value of 0 Newton and a maximum value of 10 Newton is applied to both ends of the sensor (that is, the rise time and fall time are 0), to detect the output current. Draw the graph as shown in Figure 4. It can be seen from the figure that the pressure sensor can change its own resistance as the pressure changes, which affects the current change in the circuit. Moreover, the changing law of the current in the circuit is the same as the changing law of the applied pressure, which proves the usability of the sensor from one aspect. In addition, from the experimental results, it can be seen that the response time of the current change is short, and the current changes immediately after the pressure is changed. The response in the figure is that the current graph is a square wave similar to the pressure graph.
参阅图5，柔性压力传感器疲劳测试结果图，为保障本实施例的可靠性以及实用性，进行疲劳测试。通过对柔性压力传感器施加一定的负荷，长时间连续运行系统，检测对系统性能造成的影响。测试中每隔0.5秒钟对柔性压力传感器施加1牛顿的垂直压力，持续时间为0.5秒，反复进行试验，发现经过10000次循环后依然具有良好的性能，转换能力接近实验前，结果见图5。Referring to FIG. 5 , the fatigue test result diagram of the flexible pressure sensor, in order to ensure the reliability and practicability of this embodiment, a fatigue test is carried out. By applying a certain load to the flexible pressure sensor and running the system continuously for a long time, the impact on system performance is detected. During the test, a vertical pressure of 1 Newton was applied to the flexible pressure sensor every 0.5 seconds for a duration of 0.5 seconds. After repeated tests, it was found that it still had good performance after 10,000 cycles, and the conversion ability was close to that before the experiment. The results are shown in Figure 5 .
参阅图3，本实施例柔性银质电路及天线的制备：Referring to Fig. 3, the preparation of the flexible silver circuit and antenna of the present embodiment:
ⅰ）表面改性i) Surface modification
将洁净、干燥的聚酰亚胺薄膜放入氢氧化钠溶液中，25℃恒温下浸泡3小时，用去离子水清洗，去除聚酰亚胺薄膜表面残留碱金属离子，得到洁净的、表面为聚酰胺酸盐的薄膜；其中，氢氧化钠溶液浓度为4mol/L。Put the clean and dry polyimide film into sodium hydroxide solution, soak it at a constant temperature of 25°C for 3 hours, wash it with deionized water, remove the residual alkali metal ions on the surface of the polyimide film, and obtain a clean surface with a A film of polyamic acid salt; wherein, the concentration of sodium hydroxide solution is 4mol/L.
ⅱ）离子交换ii) Ion exchange
将聚酰胺酸盐的薄膜放入银氨溶液中，使之与银氨溶液充分接触并室温下浸泡20分钟，用去离子水清洗，去除聚酰亚胺表面残留的溶液，得到表面为银离子—聚酰亚胺络合物的薄膜；其中，银氨溶液浓度为0.02mol/L；Put the film of polyamic acid salt into the silver ammonia solution, make it fully contact with the silver ammonia solution and soak it at room temperature for 20 minutes, wash it with deionized water, remove the solution remaining on the surface of the polyimide, and obtain a surface with silver ions -The thin film of polyimide complex; Wherein, silver ammonia solution concentration is 0.02mol/L;
ⅲ）掩模打印iii) Mask printing
将银离子—聚酰亚胺络合物的薄膜平整得贴在A4纸上，通过喷墨打印机将设计好的电路及天线掩模图案打印在该薄膜表面；暴露的表面将在还原过程中生长出银层，而喷墨打印的墨粉易溶于丙酮等有机溶剂，后续很容易去除。Paste the film of silver ion-polyimide complex flatly on A4 paper, and print the designed circuit and antenna mask pattern on the surface of the film through an inkjet printer; the exposed surface will grow during the reduction process The silver layer is formed, while the inkjet printing toner is easily soluble in organic solvents such as acetone, and can be easily removed later.
ⅳ）还原ⅳ) Restore
将打印有图案的薄膜平整放置，在200毫升去离子水中加入浓度为30%的双氧水1毫升，配置成溶液滴于打印有图案的薄膜上，还原、生成银质电路及柔性天线。其天线为平面矩形螺旋形状，线宽为0.4mm，间距为0.2mm，整体尺寸1.5cm*3cm，工作频率为170MHz；其银质电路起到的是导线作用，对于线宽、线间距无严格要求。Place the patterned film on a flat surface, add 1 ml of 30% hydrogen peroxide to 200 ml of deionized water, make a solution and drop it on the patterned film to restore and generate silver circuits and flexible antennas. The antenna is in the shape of a flat rectangular spiral, with a line width of 0.4mm and a spacing of 0.2mm. The overall size is 1.5cm*3cm, and the working frequency is 170MHz. The silver circuit acts as a wire, and there is no strict line width and line spacing. Require.
制备原理：先用氢氧化钠溶液对聚酰亚胺薄膜进行表面改性处理，聚酰胺环受到OH-的攻击而开环,形成聚酰胺酸盐(PAA)的形式，碱性金属离子嵌入，随后使用银氨溶液处理,使得Na+离子与目标银金属盐进行离子交换，最终获得带有金属盐的络合物；通过热处理或化学反应将银离子还原成金属银。Preparation principle: firstly use sodium hydroxide solution to modify the surface of the polyimide film, the polyamide ring is attacked by OH- and the ring is opened to form polyamic acid salt (PAA), and the alkaline metal ion is embedded, Then use silver ammonia solution to make ion exchange between Na+ ions and the target silver metal salt, and finally obtain a complex with metal salt; silver ions are reduced to metallic silver by heat treatment or chemical reaction.
再采用双氧水作为还原剂进行一次氧化还原反应，这是一个固-液交界面处发生的反应。反应中，银离子将先被还原成银纳米颗粒,，在交界面上聚集，而后逐渐形成枝晶、花椰菜状和圆盘状的结构，最后成为紧密连续的银纳米层。Then use hydrogen peroxide as a reducing agent to carry out a redox reaction, which is a reaction that occurs at the solid-liquid interface. During the reaction, silver ions will first be reduced to silver nanoparticles, which gather at the interface, and then gradually form dendrite, cauliflower-like and disk-like structures, and finally become a dense and continuous silver nanolayer.
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| CN201710312407.1ACN107219028A (en) | 2017-05-05 | 2017-05-05 | A kind of preparation method of the flexible wireless pressure detecting system based on inkjet technology |
| Application Number | Priority Date | Filing Date | Title |
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| CN201710312407.1ACN107219028A (en) | 2017-05-05 | 2017-05-05 | A kind of preparation method of the flexible wireless pressure detecting system based on inkjet technology |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710312407.1APendingCN107219028A (en) | 2017-05-05 | 2017-05-05 | A kind of preparation method of the flexible wireless pressure detecting system based on inkjet technology |
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