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Lin, Songyue; Feng, Wendou; Miao, Xiaofei; Zhang, Xiangxin; Chen, Sujing; Chen, Yuanqiang; Wang, Wei; Zhang, Yining
Biosensors & bioelectronics, 07/2018, Letnik: 110Journal Article
Flexible and implantable glucose biosensors are emerging technologies for continuous monitoring of blood-glucose of diabetes. Developing a flexible conductive substrates with high active surface area is critical for advancing the technology. Here, we successfully fabricate a flexible and highly sensitive nonenzymatic glucose by using DVD-laser scribed graphene (LSG) as a flexible conductively substrate. Copper nanoparticles (Cu-NPs) are electrodeposited as the catalyst. The LSG/Cu-NPs sensor demonstrates excellent catalytic activity toward glucose oxidation and exhibits a linear glucose detection range from 1 μM to 4.54 mM with high sensitivity (1.518 mA mM−1 cm−2) and low limit of detection (0.35 μM). Moreover, the LSG/Cu-NPs sensor shows excellent reproducibility and long-term stability. It is also highly selective toward glucose oxidation under the presence of various interfering species. Excellent flexing stability is also demonstrated by the LSG/Cu-NPs sensor, which is capable of maintaining 83.9% of its initial current after being bent against a 4-mm diameter rod for 180 times. The LSG/Cu-NPs sensor shows great potential for practical application as a nonenzymatic glucose biosensor. Meanwhile, the LSG conductive substrate provides a platform for the developing next-generation flexible and potentially implantable bioelectronics and biosensors. Display omitted •A flexible and highly sensitive LSG/Cu-NPs glucose sensor is successfully fabricated.•Cu nanoparticle catalysts are electrodeposited on a laser-scribed-graphene substrate produced by a DVD drive.•The LSG/Cu-NPs sensor demonstrates a linear glucose detection range from 1 μM to 4.54 mM.•The LSG/Cu-NPs sensor exhibits high sensitivity (1.518 mA mM−1 cm−2) and low limit of detection (0.35 μM).•Excellent flexing stability and interfering resistance are demonstrated by the LSG/Cu-NPs sensor.
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