Sodium Alginate/MXene-Based Flexible Humidity Sensors with High-Humidity Durability and Application Potentials in Breath Monitoring and Non-Contact Human–Machine Interfaces
Flexible humidity sensors (FHSs) with fast response times and durability to high-humidity environments are highly desirable for practical applications. Herein, an FHS based on crosslinked sodium alginate (SA) and MXene was fabricated, which exhibited high sensitivity (impedance varied from 10<sup...
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MDPI AG
2024-10-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/14/21/1694 |
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| author | Huizhen Chen Xiaodong Huang Yikai Yang Yang Li |
| author_facet | Huizhen Chen Xiaodong Huang Yikai Yang Yang Li |
| author_sort | Huizhen Chen |
| collection | DOAJ |
| description | Flexible humidity sensors (FHSs) with fast response times and durability to high-humidity environments are highly desirable for practical applications. Herein, an FHS based on crosslinked sodium alginate (SA) and MXene was fabricated, which exhibited high sensitivity (impedance varied from 10<sup>7</sup> to 10<sup>5</sup> Ω between 10% and 90% RH), good selectivity, prompt response times (response/recover time of 4 s/11 s), high sensing linearity (R<sup>2</sup> = 0.992) on a semi-logarithmic scale, relatively small hysteresis (~5% RH), good repeatability, and good resistance to highly humid environments (negligible changes in sensing properties after being placed in 98% RH over 24 h). It is proposed that the formation of the crosslinking structure of SA and the introduction of MXene with good conductivity and a high specific surface area contributed to the high performance of the composite FHS. Moreover, the FHS could promptly differentiate the respiration status, recognize speech, and measure fingertip movement, indicating potential in breath monitoring and non-contact human–machine interactions. This work provides guidance for developing advanced flexible sensors with a wide application scope in wearable electronics. |
| format | Article |
| id | doaj-art-82fa0aea4ff943ef9cc3146cdbaab103 |
| institution | OA Journals |
| issn | 2079-4991 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | MDPI AG |
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| series | Nanomaterials |
| spelling | doaj-art-82fa0aea4ff943ef9cc3146cdbaab1032025-08-20T02:13:14ZengMDPI AGNanomaterials2079-49912024-10-011421169410.3390/nano14211694Sodium Alginate/MXene-Based Flexible Humidity Sensors with High-Humidity Durability and Application Potentials in Breath Monitoring and Non-Contact Human–Machine InterfacesHuizhen Chen0Xiaodong Huang1Yikai Yang2Yang Li3MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310058, ChinaMOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310058, ChinaMOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310058, ChinaMOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310058, ChinaFlexible humidity sensors (FHSs) with fast response times and durability to high-humidity environments are highly desirable for practical applications. Herein, an FHS based on crosslinked sodium alginate (SA) and MXene was fabricated, which exhibited high sensitivity (impedance varied from 10<sup>7</sup> to 10<sup>5</sup> Ω between 10% and 90% RH), good selectivity, prompt response times (response/recover time of 4 s/11 s), high sensing linearity (R<sup>2</sup> = 0.992) on a semi-logarithmic scale, relatively small hysteresis (~5% RH), good repeatability, and good resistance to highly humid environments (negligible changes in sensing properties after being placed in 98% RH over 24 h). It is proposed that the formation of the crosslinking structure of SA and the introduction of MXene with good conductivity and a high specific surface area contributed to the high performance of the composite FHS. Moreover, the FHS could promptly differentiate the respiration status, recognize speech, and measure fingertip movement, indicating potential in breath monitoring and non-contact human–machine interactions. This work provides guidance for developing advanced flexible sensors with a wide application scope in wearable electronics.https://www.mdpi.com/2079-4991/14/21/1694flexible humidity sensorsodium alginateMXenehigh-humidity durabilitybreath monitoringnon-contact human–machine interface |
| spellingShingle | Huizhen Chen Xiaodong Huang Yikai Yang Yang Li Sodium Alginate/MXene-Based Flexible Humidity Sensors with High-Humidity Durability and Application Potentials in Breath Monitoring and Non-Contact Human–Machine Interfaces Nanomaterials flexible humidity sensor sodium alginate MXene high-humidity durability breath monitoring non-contact human–machine interface |
| title | Sodium Alginate/MXene-Based Flexible Humidity Sensors with High-Humidity Durability and Application Potentials in Breath Monitoring and Non-Contact Human–Machine Interfaces |
| title_full | Sodium Alginate/MXene-Based Flexible Humidity Sensors with High-Humidity Durability and Application Potentials in Breath Monitoring and Non-Contact Human–Machine Interfaces |
| title_fullStr | Sodium Alginate/MXene-Based Flexible Humidity Sensors with High-Humidity Durability and Application Potentials in Breath Monitoring and Non-Contact Human–Machine Interfaces |
| title_full_unstemmed | Sodium Alginate/MXene-Based Flexible Humidity Sensors with High-Humidity Durability and Application Potentials in Breath Monitoring and Non-Contact Human–Machine Interfaces |
| title_short | Sodium Alginate/MXene-Based Flexible Humidity Sensors with High-Humidity Durability and Application Potentials in Breath Monitoring and Non-Contact Human–Machine Interfaces |
| title_sort | sodium alginate mxene based flexible humidity sensors with high humidity durability and application potentials in breath monitoring and non contact human machine interfaces |
| topic | flexible humidity sensor sodium alginate MXene high-humidity durability breath monitoring non-contact human–machine interface |
| url | https://www.mdpi.com/2079-4991/14/21/1694 |
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