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- 저자 : Zheng Youdou (검색결과 2 건)
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Stable pH sensitivity of LaAlO3/SrTiO3 interfacial electronic gas
Dong Yan,Zhang Lunyong,Li Chen,Liu Yanli,Shao Pengfei,Lei Jianming,Wang Rui,Wu Di,Chen Dunjun,Zhang Rong,Zheng Youdou 한국물리학회 2022 Current Applied Physics Vol.34 No.-
Probing pH value is essential for many applications. The request of developing stable and highly sensitive pH sensor with small size are increased recently, this is a challenge to the traditional glass pH sensors. This work investigated the pH sensing performance of the novel two-dimensional electronic gas (2DEG) at the LaAlO3/ SrTiO3 heterostructure interface discovered recently. The experimental results demonstrated that the devices host excellent sensing ability to the pH value of aqueous solutions. Quite stable output current is realized for a given pH value, and the output current is linearly dependent on pH value as required by sensor applications. This work would prompt the application research of LaAlO3/SrTiO3 heterostructure and design of new generation of advanced pH sensors.
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AlGaN/GaN heterostructure pH sensor with multi-sensing segments
Dong, Yan,Son, Dong-hyeok,Dai, Quan,Lee, Jun-Hyeok,Won, Chul-Ho,Kim, Jeong-Gil,Kang, Seung-Hyeon,Lee, Jung-Hee,Chen, Dunjun,Lu, Hai,Zhang, Rong,Zheng, Youdou Elsevier 2018 Sensors and actuators. B, Chemical Vol.260 No.-
<P><B>Abstract</B></P> <P>pH sensor is very important in various fields, and has triggered many types of devices based on different materials and mechanisms. How to improve the performances of the sensors is one of major challenges now. In the present paper, we developed an idea to improve the sensitivity of pH sensors based on AlGaN/GaN high-electron-mobility transistors (HEMTs) by introducing multi-sensing segments, and experimentally fabricated prototype devicesand then investigated their responses to aqueous solutions under different pH values. The optimized sensor exhibits a very high linear sensitivity of 1.35 mA/pH at drain-source voltage of 1.5 V, which is much higher than those of conventional pH sensors with single open gate sensing area. This indicates that the multi-sensing segments is very effective in increasing the sensitivity of the pH sensor, rather than simply increasing the sensing area. The sensors degrade after measurement in solution for a long working time, but they can recover to their initial states in a certain duration after washing, typically ∼24 h. Our finding paves new strategy for the future design of high sensitive and stable pH sensors based on HEMTs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Novel multi-sensing segments pH sensor is designed and fabricated by using AlGaN/GaN high electron mobility transistor. </LI> <LI> Realizing very high sensitivity on the multi-sensing sensor, which is much higher than that of conventional geometric pH sensor. </LI> <LI> Achieved excellent performance stability with good recovery feature on the multi-sensing sensor. </LI> </UL> </P>
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