期刊
MACROMOLECULAR BIOSCIENCE
卷 20, 期 11, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mabi.202000144
关键词
flexible electronics; lactate sensor; organic transistor; voltage amplifiers; wearable sensor
资金
- Center for Advanced Soft Electronics under the Global Frontier Research Program - Korea government [2015M3A6A5072945]
- National Research Foundation of Korea (NRF) - Korea government [2018R1A2A3075391]
- IT Consilience Creative Program - Korea government [IITP-2020-2011-1-00783]
- National Research Foundation of Korea [2015M3A6A5072945, 2018R1A2A3075391] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Organic transistors are promising platforms for wearable biosensors. However, the strategies to improve signal amplification have yet to be determined, particularly regarding biosensors that generate very weak signals. In this study, an organic voltage amplifier is presented for a lactate sensor on flexible plastic foil. The preamplifier is based on a 3D complementary inverter, which is achieved by vertically stacking complementary transistors with a shared gate between them. The shared gate is extended and functionalized with a lactate oxidase enzyme to detect lactate. The sensing device successfully detects the lactate concentration in the human sweat range (20-60 mm) with high sensitivity (6.82 mV mm(-1)) due to high gain of its amplification. The 3D integration process is cost-effective as it is solution-processable and doubles the number of transistors per unit area. The device presented in this study would pave the way for the development of high-gain noninvasive sweat lactate sensors that can be wearable.
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