Wearable Humidity Sensor Using Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> Metal Halides with Hydroxyl Selective Phase Transition for Breath Monitoring
The low-dimensional metal halide Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> exhibits unique electrical and chemical properties. Notably, it undergoes a phase transition to CsCu<sub>2</sub>I<sub>3</sub> upon exposure to hydroxyl (-OH) gas, re...
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MDPI AG
2025-05-01
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| Series: | Biosensors |
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| author | Si Hyeok Yang Lim Kyung Oh Dong Ho Lee Donghoon Gwak Nara Song Bowon Oh Na Young Lee Hongki Kim Han Seul Kim Jin Woo Choi |
| author_facet | Si Hyeok Yang Lim Kyung Oh Dong Ho Lee Donghoon Gwak Nara Song Bowon Oh Na Young Lee Hongki Kim Han Seul Kim Jin Woo Choi |
| author_sort | Si Hyeok Yang |
| collection | DOAJ |
| description | The low-dimensional metal halide Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> exhibits unique electrical and chemical properties. Notably, it undergoes a phase transition to CsCu<sub>2</sub>I<sub>3</sub> upon exposure to hydroxyl (-OH) gas, resulting in significant changes in its electrical characteristics. In this study, we developed a highly selective semiconductor-based gas sensor utilizing Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub>. The material was synthesized on an Al<sub>2</sub>O<sub>3</sub> substrate with carbon electrodes using a solution-based process, enabling gas sensing based on its electrical properties. The sensor was further integrated into an Arduino-based real-time monitoring system for wearable applications. The final system was mounted onto a face mask, enabling the real-time detection of human respiration. This research presents a next-generation sensor platform for real-time respiratory monitoring, demonstrating the potential of Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> in advanced wearable bio-gas sensing applications. |
| format | Article |
| id | doaj-art-1f474b618e904c90ab12c0cd881e6cb8 |
| institution | OA Journals |
| issn | 2079-6374 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | MDPI AG |
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| series | Biosensors |
| spelling | doaj-art-1f474b618e904c90ab12c0cd881e6cb82025-08-20T02:33:42ZengMDPI AGBiosensors2079-63742025-05-0115531110.3390/bios15050311Wearable Humidity Sensor Using Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> Metal Halides with Hydroxyl Selective Phase Transition for Breath MonitoringSi Hyeok Yang0Lim Kyung Oh1Dong Ho Lee2Donghoon Gwak3Nara Song4Bowon Oh5Na Young Lee6Hongki Kim7Han Seul Kim8Jin Woo Choi9Department of Data Information and Physics, Kongju National University, Gongju-si 32588, Republic of KoreaDepartment of Advanced Materials Engineering, Chungbuk National University, Cheongju-si 28644, Republic of KoreaDepartment of Advanced Materials Engineering, Chungbuk National University, Cheongju-si 28644, Republic of KoreaDepartment of Data Information and Physics, Kongju National University, Gongju-si 32588, Republic of KoreaDepartment of Data Information and Physics, Kongju National University, Gongju-si 32588, Republic of KoreaDepartment of Data Information and Physics, Kongju National University, Gongju-si 32588, Republic of KoreaDepartment of Data Information and Physics, Kongju National University, Gongju-si 32588, Republic of KoreaDepartment of Chemistry, Kongju National University, Gongju-si 32588, Republic of KoreaDepartment of Advanced Materials Engineering, Chungbuk National University, Cheongju-si 28644, Republic of KoreaDepartment of Data Information and Physics, Kongju National University, Gongju-si 32588, Republic of KoreaThe low-dimensional metal halide Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> exhibits unique electrical and chemical properties. Notably, it undergoes a phase transition to CsCu<sub>2</sub>I<sub>3</sub> upon exposure to hydroxyl (-OH) gas, resulting in significant changes in its electrical characteristics. In this study, we developed a highly selective semiconductor-based gas sensor utilizing Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub>. The material was synthesized on an Al<sub>2</sub>O<sub>3</sub> substrate with carbon electrodes using a solution-based process, enabling gas sensing based on its electrical properties. The sensor was further integrated into an Arduino-based real-time monitoring system for wearable applications. The final system was mounted onto a face mask, enabling the real-time detection of human respiration. This research presents a next-generation sensor platform for real-time respiratory monitoring, demonstrating the potential of Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> in advanced wearable bio-gas sensing applications.https://www.mdpi.com/2079-6374/15/5/311low-dimensional metal halidesgas sensorwearable devicehealth care |
| spellingShingle | Si Hyeok Yang Lim Kyung Oh Dong Ho Lee Donghoon Gwak Nara Song Bowon Oh Na Young Lee Hongki Kim Han Seul Kim Jin Woo Choi Wearable Humidity Sensor Using Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> Metal Halides with Hydroxyl Selective Phase Transition for Breath Monitoring Biosensors low-dimensional metal halides gas sensor wearable device health care |
| title | Wearable Humidity Sensor Using Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> Metal Halides with Hydroxyl Selective Phase Transition for Breath Monitoring |
| title_full | Wearable Humidity Sensor Using Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> Metal Halides with Hydroxyl Selective Phase Transition for Breath Monitoring |
| title_fullStr | Wearable Humidity Sensor Using Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> Metal Halides with Hydroxyl Selective Phase Transition for Breath Monitoring |
| title_full_unstemmed | Wearable Humidity Sensor Using Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> Metal Halides with Hydroxyl Selective Phase Transition for Breath Monitoring |
| title_short | Wearable Humidity Sensor Using Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> Metal Halides with Hydroxyl Selective Phase Transition for Breath Monitoring |
| title_sort | wearable humidity sensor using cs sub 3 sub cu sub 2 sub i sub 5 sub metal halides with hydroxyl selective phase transition for breath monitoring |
| topic | low-dimensional metal halides gas sensor wearable device health care |
| url | https://www.mdpi.com/2079-6374/15/5/311 |
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