Aerosol-jet printing of flexible green graphene humidity sensors for IoT applications

被引:2
|
作者
Ketabi, Mohsen [1 ]
Al Shboul, Ahmad [1 ]
Mahinnezhad, Shirin [1 ]
Izquierdo, Ricardo [1 ]
机构
[1] Ecole Technol Super ETS, Dept Elect Engn, 1100 Notre Dame St W, Montreal, PQ H3C 1K3, Canada
来源
2021 IEEE SENSORS | 2021年
基金
加拿大自然科学与工程研究理事会;
关键词
Aerosol printer; flexible; gelatin; graphene ink; humidity sensor; triton X-100;
D O I
10.1109/SENSORS47087.2021.9639642
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This research focuses on designing and developing highly sensitive flexible graphene sensors for humidity detection. First, green graphene inks were prepared with triton X-100 (Ge-GTr) as a dispersant and loaded gelatin as a binder. Then, flexible graphene sensors were fabricated by printing the graphene inks with aerosol-jet on top of screen-printed carbon electrodes. High gelatin-modified sensors (0.5Ge-GTr and 1Ge-GTr) exhibited a good linear response in relative humidity (RH) range of 30%RH-90%RH with a good sensitivity of 0.55/%RH at 25 degrees C and with fast response in a second range. Moreover, they showed good stability to temperature fluctuation ranged from 22 degrees C to 70 degrees C. The humidity sensing mechanism depends on the surface coverage of graphene by the hydrophilic coating. The electrons transfer can explain the sensing mechanism for sensors of GTr, and 0.1Ge-GTr. In contrast, sensors' response could be better explained by gelatin swelling for 0.25Ge-GTr, 0.5Ge-GTr, and 1Ge-GTr sensors upon humidity detection. The proposed humidity sensors (0.5Ge-GTr and 1Ge-GTr) are green, highly sensitive, and with a fast response to human breathing, making them good candidates for healthcare applications such as respiration sensors for facial masks.
引用
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页数:4
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