Improvement in Strain Sensor Stability by Adapting the Metal Contact Layer
Research on stretchable strain sensors is actively conducted due to increasing interest in wearable devices. However, typical studies have focused on improving the elasticity of the electrode. Therefore, methods of directly connecting wire or attaching conductive tape to materials to detect deformat...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-01-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/22/2/630 |
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| author | Ji-Yeon Choy Eun-Bee Jo Chang-Joo Yim Hae-Kyung Youi Jung-Hoon Hwang Jun-Ho Lee Hyun-Seok Kim |
| author_facet | Ji-Yeon Choy Eun-Bee Jo Chang-Joo Yim Hae-Kyung Youi Jung-Hoon Hwang Jun-Ho Lee Hyun-Seok Kim |
| author_sort | Ji-Yeon Choy |
| collection | DOAJ |
| description | Research on stretchable strain sensors is actively conducted due to increasing interest in wearable devices. However, typical studies have focused on improving the elasticity of the electrode. Therefore, methods of directly connecting wire or attaching conductive tape to materials to detect deformation have been used to evaluate the performance of strain sensors. Polyaniline (PANI), a p-type semiconductive polymer, has been widely used for stretchable electrodes. However, conventional procedures have limitations in determining an appropriate metal for ohmic contact with PANI. Materials that are generally used for connection with PANI form an undesirable metal-semiconductor junction and have significant contact resistance. Hence, they degrade sensor performance. This study secured ohmic contact by adapting Au thin film as the metal contact layer (the MCL), with lower contact resistance and a larger work function than PANI. Additionally, we presented a buffer layer using hard polydimethylsiloxane (PDMS) and structured it into a dumbbell shape to protect the metal from deformation. As a result, we enhanced steadiness and repeatability up to 50% strain by comparing the gauge factors and the relative resistance changes. Consequently, adapting structural methods (the MCL and the dumbbell shape) to a device can result in strain sensors with promising stability, as well as high stretchability. |
| first_indexed | 2024-03-10T00:33:06Z |
| format | Article |
| id | doaj.art-0bd40cb38cae463e9a8f8798ac391bbb |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T00:33:06Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-0bd40cb38cae463e9a8f8798ac391bbb2023-11-23T15:21:53ZengMDPI AGSensors1424-82202022-01-0122263010.3390/s22020630Improvement in Strain Sensor Stability by Adapting the Metal Contact LayerJi-Yeon Choy0Eun-Bee Jo1Chang-Joo Yim2Hae-Kyung Youi3Jung-Hoon Hwang4Jun-Ho Lee5Hyun-Seok Kim6Division of Electronics and Electrical Engineering, Dongguk University, Seoul 04620, KoreaDivision of Electronics and Electrical Engineering, Dongguk University, Seoul 04620, KoreaDivision of Electronics and Electrical Engineering, Dongguk University, Seoul 04620, KoreaDivision of Electronics and Electrical Engineering, Dongguk University, Seoul 04620, KoreaDivision of Electronics and Electrical Engineering, Dongguk University, Seoul 04620, KoreaDivision of Electronics and Electrical Engineering, Dongguk University, Seoul 04620, KoreaDivision of Electronics and Electrical Engineering, Dongguk University, Seoul 04620, KoreaResearch on stretchable strain sensors is actively conducted due to increasing interest in wearable devices. However, typical studies have focused on improving the elasticity of the electrode. Therefore, methods of directly connecting wire or attaching conductive tape to materials to detect deformation have been used to evaluate the performance of strain sensors. Polyaniline (PANI), a p-type semiconductive polymer, has been widely used for stretchable electrodes. However, conventional procedures have limitations in determining an appropriate metal for ohmic contact with PANI. Materials that are generally used for connection with PANI form an undesirable metal-semiconductor junction and have significant contact resistance. Hence, they degrade sensor performance. This study secured ohmic contact by adapting Au thin film as the metal contact layer (the MCL), with lower contact resistance and a larger work function than PANI. Additionally, we presented a buffer layer using hard polydimethylsiloxane (PDMS) and structured it into a dumbbell shape to protect the metal from deformation. As a result, we enhanced steadiness and repeatability up to 50% strain by comparing the gauge factors and the relative resistance changes. Consequently, adapting structural methods (the MCL and the dumbbell shape) to a device can result in strain sensors with promising stability, as well as high stretchability.https://www.mdpi.com/1424-8220/22/2/630stretchable sensorstrain sensorwearable devicepolyanilinePDMS |
| spellingShingle | Ji-Yeon Choy Eun-Bee Jo Chang-Joo Yim Hae-Kyung Youi Jung-Hoon Hwang Jun-Ho Lee Hyun-Seok Kim Improvement in Strain Sensor Stability by Adapting the Metal Contact Layer Sensors stretchable sensor strain sensor wearable device polyaniline PDMS |
| title | Improvement in Strain Sensor Stability by Adapting the Metal Contact Layer |
| title_full | Improvement in Strain Sensor Stability by Adapting the Metal Contact Layer |
| title_fullStr | Improvement in Strain Sensor Stability by Adapting the Metal Contact Layer |
| title_full_unstemmed | Improvement in Strain Sensor Stability by Adapting the Metal Contact Layer |
| title_short | Improvement in Strain Sensor Stability by Adapting the Metal Contact Layer |
| title_sort | improvement in strain sensor stability by adapting the metal contact layer |
| topic | stretchable sensor strain sensor wearable device polyaniline PDMS |
| url | https://www.mdpi.com/1424-8220/22/2/630 |
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