WO2017043695A1 - 강유전성 복합 소재 기반 인공 전자 피부 - Google Patents
강유전성 복합 소재 기반 인공 전자 피부 Download PDFInfo
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- WO2017043695A1 WO2017043695A1 PCT/KR2015/012107 KR2015012107W WO2017043695A1 WO 2017043695 A1 WO2017043695 A1 WO 2017043695A1 KR 2015012107 W KR2015012107 W KR 2015012107W WO 2017043695 A1 WO2017043695 A1 WO 2017043695A1
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- layer
- electronic skin
- artificial electronic
- lower electrode
- temperature
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- 239000002131 composite material Substances 0.000 title claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 229920001328 Polyvinylidene chloride Polymers 0.000 claims description 9
- 239000005033 polyvinylidene chloride Substances 0.000 claims description 9
- 239000002033 PVDF binder Substances 0.000 claims description 8
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910021389 graphene Inorganic materials 0.000 claims description 7
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- A61B5/02438—Detecting, measuring or recording pulse rate or heart rate with portable devices, e.g. worn by the patient
Definitions
- the present invention relates to a ferroelectric composite material-based artificial electronic skin, and more specifically, to a micro dome structure in which a composite material of polyvinylidene chloride (PVDF) and graphene oxide (GO) having ferroelectric characteristics is interlocked.
- PVDF polyvinylidene chloride
- GO graphene oxide
- the present invention relates to a ferroelectric composite material-based artificial electronic skin capable of detecting static tactile touch and temperature by using a property of changing resistance according to physical and thermal stimuli in addition to conventional piezoelectric characteristic-based dynamic tactile sensing.
- the present invention relates to an application technology of artificial electronic skin that can monitor the pulse change according to temperature and detect the sound waves and the surface texture by introducing static / dynamic tactile sense and temperature detection and fingerprint simulation pattern.
- Conventional artificial electronic skin has a limitation in simultaneously measuring static or dynamic tactile sense through a single measurement mode, and above all, there is a problem in that it is difficult to separate the detection signal in order to distinguish between physical tactile sense and temperature.
- the conventional pulse signal detection using artificial electronic skin does not include the effect on temperature, and because it is difficult to measure both static and dynamic tactile sensations simultaneously, it is difficult to accurately detect the roughness and texture of the surface like real skin. have.
- the present invention in order to solve the above problems, while controlling the composite material of PVDF (Polyviny liDene Chloride) and GO (Graphene Oxide) in an interlocking micro dome structure, the dynamic tactile sensing characteristics of the conventional piezoelectric material
- the object of the present invention is to provide an artificial electronic skin capable of distinguishing static tactile sensation and temperature by using a characteristic in which resistance changes according to pressure and temperature.
- the artificial electronic skin according to the present invention is a lower electrode; A first layer stacked on the lower electrode; a hemispherical first micro dome formed by standing up from the first layer; A second layer laminated on the first layer; A semispherical second micro dome formed to be engaged with the first micro dome under the second layer opposite to the first layer, and an upper electrode stacked on an upper surface of the second layer; And a pattern layer accommodated in an external pressure applied by being stacked on an upper surface of the upper electrode.
- Artificial electronic skin according to the present invention has the effect of detecting and distinguishing the dynamic and static in one device using different signals.
- the artificial electronic skin according to the present invention has the effect of sensing the temperature by using the temperature change characteristics of PVDF (PolyViny liDene Chloride) and GO (Graphene Oxide) material, and through the interlocking dome structure There is an effect that can implement temperature sensitivity.
- PVDF PolyViny liDene Chloride
- GO Graphene Oxide
- 1 is a multi-functional electronic skin structure that simulates human skin
- Figure 2 is a view showing for explaining the temperature sensing characteristics of the flexible rGO / PVDF nanocomposite film
- FIG. 3 illustrates the characteristics of piezoresistive electronic skin with an interlocked micro dome array for stimulus detection of static pressure and temperature.
- FIG. 4 illustrates the characteristics of piezoresistive electronic skin with an interlocked micro dome array for stimulus monitoring of arterial pulse pressure and temperature.
- FIG. 5 illustrates the characteristics of piezoelectric electronic skin with an interlocked micro dome array for dynamic touch and acoustic sound sensing
- FIG. 6 is a view for explaining the characteristics of the piezoelectric electronic skin having a fingerprint pattern for texture detection.
- FIG. 1 is a block diagram of an artificial electronic skin according to the present invention.
- the artificial electronic skin according to the present invention includes a lower electrode 100, a first layer 200, a second layer 300, an upper electrode 400, and a pattern layer 500. do.
- the lower electrode 100 is a copper (Cu) electrode, and is stacked on the lowermost part of the artificial electronic skin according to the present invention, and used as an electrode for measuring piezorelectric characteristics and piezoresistive characteristics.
- Cu copper
- the first layer 200 is formed by stacking the lower electrode 100, and is made of polyvinylidene chloride (PVDF) / reduced graphene oxide (GO) composite to sense static / dynamic tactile sensation and temperature. do.
- PVDF polyvinylidene chloride
- GO reduced graphene oxide
- a plurality of hemispherical first micro domes 210 are formed on the first layer 200, and the first micro dome 210 has an extended surface area to improve sensitivity due to vertical pressure. have.
- the second layer 300 is formed by being stacked on top of the first layer 200.
- PVDF PolyViny liDene Chloride: polyvinylidene chloride
- GO reduced graphene oxide
- the second layer 300 has a plurality of second micro domes 310 formed at the bottom thereof so as to be engaged with the first micro dome 210 formed at the top of the first layer 200. .
- the upper electrode 400 is stacked on top of the second layer 300 and used as an electrode for measuring piezorelectric characteristics as well as piezoelectric characteristics, like the lower electrode 100.
- the pattern layer 500 is composed of a fabric of an elastomeric pattern, and composed of a pattern that simulates a finger fingerprint to amplify a signal to implement an effective force transfer.
- the lower electrode 100 and the upper electrode 400 are bonded to the first layer 200 and the second layer 300 by silver paste, respectively, for one hour to minimize contact resistance. Annealed at 90 ° C.
- the temperature may be sensed through a current value or a voltage value measured through a wire connected to the lower electrode 100 and the upper electrode 400.
- FIG. 2A a cross-sectional SEM image of a reduced graphene oxide (rGO) / PolyViny liDene Chloride (polyvinylidene chloride) composite film at a rGO concentration of 1 wt.% (Mass percent) shows that the rGO sheet is It is shown that it is uniformly dispersed and stacked in the PVDF matrix.
- rGO reduced graphene oxide
- PolyViny liDene Chloride polyvinylidene chloride
- Fig. 2D when a human hand is placed on the artificial electronic skin according to the present invention, the temperature change is displayed over all of the parts contacted by the temperature sensor.
- FIG. 2E a representative optical image and an infrared camera image are shown in FIG. 2E.
- the solid line shows the time-dependent resistance change of the artificial electronic skin
- the dotted line shows the water droplet temperature, when water droplets fall on the artificial electronic skin in a 25 ° C. space, The electrical resistance does not change.
- pressure-induced electrical characteristics, piezoelectric resistance, and piezoelectric signals are measured using a semiconductor parameter analyzer and a source meter connected to the lower electrode 100 and the upper electrode 400 by wire, respectively.
- the pressure sensitivity of the interlocked micro dome array is significantly higher than flat films due to the large change of contact surface and stress concentration effects between neighboring micro dome arrays (FIG. 3B).
- the structure of the interlocked micro dome array has a high TCR value (2.93% / ° C.) compared to the TCR value (1.58% / ° C.) of the flat film (FIG. 3C).
- the resistance gradually increases due to the cooling of the warm water droplets over time, and finally reaches a resistance value of 0.92, which is a thermal equilibrium corresponding to the static pressure applied by the water droplets.
- the artificial electronic skin according to the present invention is wearably encapsulated in a size of 1-2 cm by the polyimide film, and wrapped around the wrist to monitor the arterial pressure pulse.
- blood vessels expand or contract with decreasing or increasing pulse pressure.
- FIG 4B illustrates the read of a typical piezoresistive the wrist pulse pressure, there three kinds of distinct peaks (P 1, P 2, P 3) is shown, the pulse pressure (P 1) is caused by a blood flow derived by the systole Pressure difference between the systolic system (PSys) and the diastolic system (PDia).
- PSys systolic system
- PDia diastolic system
- reflected wave pressures P 2 and P 3 are generated by waves reflected from the peripheral portion (P 2 is the hand and P 3 is the lower body).
- PDia diastolic blood pressure
- FIG. 4F Detailed analysis of the parameters following the pulse waveform is shown in FIG. 4F.
- the relative resistance decreases linearly with increasing skin temperature in FIG. 3C, which can be used to directly monitor the skin temperature during measurement of arterial pulse pressure.
- Artificial electronic skin of the ferroelectric according to the present invention having an engagement structure is capable of piezoelectric recognition of dynamic tactile stimulation.
- the interlocking electronic skin has a large contact area and has a pressure concentrating effect at a narrow contact area between the micro domes, thereby improving piezoelectric performance.
- the piezoelectric current of the interlocked micro dome film depends on the typical force exerted at 35 uA / Pa at 2.45 kPa or less and 5 uA / Pa at 2.45 to 17.15 kPa.
- the piezoelectric current and voltage gradually increase as the impact frequency (0.1 Hz to 1.5 Hz) is applied.
- the relaxation after the change of the piezoelectric current and the micro dome array engaged with the instantaneous deformation enables the detection of sound waves consisting of high frequency vibrations.
- the sound detection capability can be described by monitoring the sound waveform generated from the speaker by the interlocked electronic skin according to the present invention.
- the piezoelectric voltage of the interlocked electronic skin increases in proportion to the frequency and gradually decreases after 2000 Hz while the frequency reaches the maximum value of 2000 Hz.
- the piezoelectric voltage waveform responds from the speaker with sounds of different alphabets such as S, K, I, and N.
- Fast adapting piezoelectric electronic skin can enable spatial and temporal encoding of tactile signals that are easy to recognize surface textures.
- the electronic skin is attached to the microstage as shown in the middle of FIG. 6A and scanned through the surface texture as shown at the bottom of FIG. 6A at different scanning speeds.
- a ridge parallel to the surface of the electronic skin, as shown at the top of FIG. 6A for amplification of texture-induced vibration, to simulate the fingerprint pattern of a human hand. Adopted.
- 6B shows the change in piezoelectric current over time when the interlocked electronic skin scans through a surface texture with parallel patterns at different scanning speeds (0.25-2.5 mm / s).
- the fast Fourier transform spectrum for the piezoelectric current signal indicates that there is a fundamental frequency (arrow) associated with the high frequency with each scanning speed and decreasing amplitude.
- the short-time Fourier transform of the current signal better explains the change over time of the piezoelectric current.
- Scanning for regular surface patterns leads to periodic line patterns over time in the frequency range below 30 Hz, which increases with increasing scanning speed in the same time domain.
- the interlocking artificial electronic skin according to the present invention with the fingerprint pattern can sense various surfaces with different roughness, such as sandpaper, glass, and paper, as shown in FIG. 6E.
- the 30 Hz frequency band corresponds to a pitch of 83 um, close to the 80 um internal ridge distance.
- the square pattern (FIG. 6F iv) generates a frequency band close to 30 Hz similar to the band observed through scanning perpendicular to the line pattern.
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- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
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- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
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Abstract
Description
Claims (11)
- 하부전극(100);상기 하부전극(100)에 적층된 제1층(200);상기 제1층(200)에서 상부로 기립되어 형성된 반구형상의 제1 마이크로 돔(210);상기 제1층(200) 상에 적층된 제2층(300);상기 제1층(200)에 대향하는 상기 제2층(300)의 하부로 상기 제1 마이크로 돔(210)과 맞물릴 수 있도록 형성된 반구형상의 제2 마이크로 돔(310) 및상기 제2층(300)의 상단면에 적층된 상부전극(400); 및상기 상부전극(400)의 상단면에 적층되어 가해지는 외부의 압력이 수용하는 패턴층(500);을 포함하는 것을 특징으로 하는 인공 전자 피부.
- 제 1항에 있어서,상기 제1층(200)과 상기 제2층(300)은PVDF(PolyViny liDene Chloride:)와 GO(reduced graphene oxide)의 복합 소재로 이루어진 것을 특징으로 하는 인공 전자 피부.
- 제 1항에 있어서,상기 패턴층(500)은손가락 지문을 모사한 패턴으로 구성되어 있는 것을 특징으로 하는 인공 전자 피부.
- 제 1항에 있어서,상기 패턴층(500)에 온도가 상이한 물방울이 떨어진 경우, 상기 하부전극(100)과 상기 상부전극(400)을 통해 측정한 저항값에 따라 상기 물방울의 온도를 감지하는 것을 특징으로 하는 인공 전자 피부.
- 제 4항에 있어서,상기 저항값과 물방울의 온도는 반비례하는 것을 특징으로 하는 인공 전자 피부.
- 제 1항에 있어서,상기 패턴층(500)에 온도가 상이한 물방울이 떨어진 경우, 상기 하부전극(100)과 상기 상부전극(400)을 통해 측정한 저항값에 따라 상기 물방울에 의해 가해지는 압력을 감지하는 것을 특징으로 하는 인공 전자 피부.
- 제 6항에 있어서,상기 저항값과 상기 물방울에 의해 가해지는 압력은 반비례하는 것을 특징으로 하는 인공 전자 피부.
- 제 1항에 있어서,폴리이미드 필름에 의해 캡슐화되어 손목에 착용한 상태에서, 상기 하부전극(100)과 상기 상부전극(400)을 통해 상기 패턴층(500)으로 전달되는 맥박의 세기를 감지하고, 동시에 상기 맥박의 세기에 따라 측정되는 저항값을 측정하여 피부 온도를 측정하는 것을 특징으로 하는 인공 전자 피부.
- 제 8항에 있어서,상기 피부 온도와 상기 저항값은 반비례하는 것을 특징으로 하는 인공 전자 피부.
- 제 1항에 있어서,상기 패턴층(500)에 상이한 주파수의 소리가 전달되면, 상기 하부전극(100)과 상기 상부전극(400)을 통해 측정된 압전전류와 전압을 측정하여 음파를 검출하는 것을 특징으로 하는 인공 전자 피부.
- 제 1항에 있어서,상기 패턴층(500)에 상이한 질감, 패턴을 지닌 표면을 스캔하면, 상기 하부전극(100)과 상기 상부전극(400)을 통해 측정된 압전전류와 전압을 측정하여 표면의 정보를 검출하는 것을 특징으로 하는 인공 전자 피부.
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JP2017556943A JP6617157B2 (ja) | 2015-09-07 | 2015-11-11 | 強誘電性複合素材ベースの人工電子皮膚 |
US15/570,449 US10456050B2 (en) | 2015-09-07 | 2015-11-11 | Ferroelectric composite material-based artificial electronic skin |
EP15903675.5A EP3281606B1 (en) | 2015-09-07 | 2015-11-11 | Ferroelectric composite material-based artificial electronic skin |
CN201580082891.2A CN107920887B (zh) | 2015-09-07 | 2015-11-11 | 基于铁电性复合材料的人工电子皮肤 |
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KR102308301B1 (ko) | 2017-04-20 | 2021-10-05 | 엘지이노텍 주식회사 | 압력 감지 센서 및 이를 포함하는 압력 감지 장치 |
KR102361874B1 (ko) | 2017-04-20 | 2022-02-11 | 엘지이노텍 주식회사 | 압력 감지 센서 및 이를 포함하는 압력 감지 장치 |
CN108332772A (zh) * | 2018-02-08 | 2018-07-27 | 四川东鼎里智信息技术有限责任公司 | 一种基于石墨烯的远程红外线体能恢复控制系统 |
CN108469315B (zh) * | 2018-03-29 | 2020-06-19 | 湘潭大学 | 一种基于铁电畴壁氧空位电子气导电性的压力传感器单元 |
KR102044939B1 (ko) * | 2018-04-18 | 2019-11-14 | 울산과학기술원 | 광범위 압력 감지를 위한 다층 플렉서블 압력 센서 |
CN110793676A (zh) * | 2018-08-02 | 2020-02-14 | 北京纳米能源与系统研究所 | 温度湿度压力传感器及其制备方法、电子皮肤 |
GB2584825B (en) * | 2019-05-08 | 2021-12-01 | Wootzano Ltd | Substrates for electronic skins |
KR102180526B1 (ko) | 2019-08-16 | 2020-11-18 | 한양대학교 산학협력단 | 휴대용 표면 측정 장치 및 제어 방법 |
CN110793681B (zh) * | 2019-09-27 | 2020-12-29 | 北京石墨烯技术研究院有限公司 | 石墨烯压力传感器材料及其制备方法以及压力传感器 |
CN111855742B (zh) * | 2019-12-16 | 2021-11-19 | 西安交通大学 | 一种检测爆炸对人体损伤程度的电子皮肤结构及检测方法 |
CN111928979B (zh) * | 2020-07-22 | 2022-02-15 | 浙江理工大学 | 一种高灵敏度、类毛囊结构的压力传感器的制备方法 |
CN112747843A (zh) * | 2020-11-30 | 2021-05-04 | 华中科技大学 | 一种基于柔性压电传感器的桥梁监测方法及装置 |
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CN107920887A (zh) | 2018-04-17 |
US20180140207A1 (en) | 2018-05-24 |
EP3281606B1 (en) | 2021-01-20 |
US10456050B2 (en) | 2019-10-29 |
KR101790558B1 (ko) | 2017-10-27 |
KR20170029323A (ko) | 2017-03-15 |
CN107920887B (zh) | 2020-03-20 |
EP3281606A1 (en) | 2018-02-14 |
JP6617157B2 (ja) | 2019-12-11 |
JP2018517458A (ja) | 2018-07-05 |
EP3281606A4 (en) | 2019-01-02 |
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