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Depositing reduced graphene oxide on ZnO nanorods to improve the performance of enzymatic glucose sensors
Materials Science in Semiconductor Processing ( IF 4.2 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.mssp.2020.105391
Qi Mao , Weixuan Jing , Fan Zhou , Shu Liu , Weizhuo Gao , Zhengying Wei , Zhuangde Jiang

Abstract The improvement of enzymatic glucose sensors, which have outstanding advantages such as high sensitivity, good selectivity, and convenient operation, is crucial because of the increasing demand for the diabetics detection. Here, we prepared the ZnONRs-based glucose sensor by hydrothermally synthesizing the ZnO nanorods (ZnONRs) on a flexible PET substrate. The electrodeposited reduced graphenes (rGO) with different deposition cycles were coated onto the ZnONRs to modify the surface of working electrodes. The high conductivity of rGO promoted the transmission of redox electrons, which significantly improved electron transport between solution and electrode. Also, the rGO smoothed the rough surface of the working electrodes, which negligibly increased the contact angles, reduced the contacting surface area between the working electrodes and the PBS solution, and further decreased the enzyme adsorption that influences the redox electron yield. Nevertheless, the former positive effect was more significant than the latter negative one, which eventually gave rise to better performance of the rGO/ZnONR-based glucose sensors. Thereby, in the Nafion/GOx/rGO-20/ZnONRs/Au/PET sensors, the sensitivity increased by 9.2 times, the detection limit decreased by 47 times, and the linear range was extended from 7.5 mM to 12 mM, compared with sensors without rGOs. Additionally, both of the ZnONRs-based and rGO/ZnONRs-based glucose sensors show strong anti-interference performance in the test environment containing urea, uric acid, and ascorbic acid.

中文翻译:

在 ZnO 纳米棒上沉积还原氧化石墨烯以提高酶促葡萄糖传感器的性能

摘要 随着对糖尿病患者检测需求的不断增加,酶法葡萄糖传感器具有灵敏度高、选择性好、操作方便等突出优点,对其进行改进显得尤为重要。在这里,我们通过在柔性 PET 基板上水热合成 ZnO 纳米棒 (ZnONRs) 制备了基于 ZnONRs 的葡萄糖传感器。将具有不同沉积周期的电沉积还原石墨烯 (rGO) 涂覆在 ZnONR 上以修饰工作电极的表面。rGO 的高电导率促进了氧化还原电子的传输,从而显着改善了溶液和电极之间的电子传输。此外,rGO 平滑了工作电极的粗糙表面,这可以忽略不计地增加接触角,减少了工作电极和 PBS 溶液之间的接触表面积,并进一步减少了影响氧化还原电子产率的酶吸附。尽管如此,前者的积极影响比后者的消极影响更显着,最终使基于 rGO/ZnONR 的葡萄糖传感器具有更好的性能。因此,与传感器相比,Nafion/GOx/rGO-20/ZnONRs/Au/PET 传感器的灵敏度提高了 9.2 倍,检测限降低了 47 倍,线性范围从 7.5 mM 扩展到 12 mM没有 rGO。此外,基于 ZnONRs 和基于 rGO/ZnONRs 的葡萄糖传感器在含有尿素、尿酸和抗坏血酸的测试环境中均表现出很强的抗干扰性能。并进一步降低了影响氧化还原电子产率的酶吸附。尽管如此,前者的积极影响比后者的消极影响更显着,最终使基于 rGO/ZnONR 的葡萄糖传感器具有更好的性能。因此,与传感器相比,Nafion/GOx/rGO-20/ZnONRs/Au/PET 传感器的灵敏度提高了 9.2 倍,检测限降低了 47 倍,线性范围从 7.5 mM 扩展到 12 mM没有 rGO。此外,基于 ZnONRs 和基于 rGO/ZnONRs 的葡萄糖传感器在含有尿素、尿酸和抗坏血酸的测试环境中均表现出很强的抗干扰性能。并进一步降低了影响氧化还原电子产率的酶吸附。尽管如此,前者的积极影响比后者的消极影响更显着,最终使基于 rGO/ZnONR 的葡萄糖传感器具有更好的性能。因此,与传感器相比,Nafion/GOx/rGO-20/ZnONRs/Au/PET 传感器的灵敏度提高了 9.2 倍,检测限降低了 47 倍,线性范围从 7.5 mM 扩展到 12 mM没有 rGO。此外,基于 ZnONRs 和基于 rGO/ZnONRs 的葡萄糖传感器在含有尿素、尿酸和抗坏血酸的测试环境中均表现出很强的抗干扰性能。最终提高了基于 rGO/ZnONR 的葡萄糖传感器的性能。因此,与传感器相比,Nafion/GOx/rGO-20/ZnONRs/Au/PET 传感器的灵敏度提高了 9.2 倍,检测限降低了 47 倍,线性范围从 7.5 mM 扩展到 12 mM没有 rGO。此外,基于 ZnONRs 和基于 rGO/ZnONRs 的葡萄糖传感器在含有尿素、尿酸和抗坏血酸的测试环境中均表现出很强的抗干扰性能。最终提高了基于 rGO/ZnONR 的葡萄糖传感器的性能。因此,与传感器相比,Nafion/GOx/rGO-20/ZnONRs/Au/PET 传感器的灵敏度提高了 9.2 倍,检测限降低了 47 倍,线性范围从 7.5 mM 扩展到 12 mM没有 rGO。此外,基于 ZnONRs 和基于 rGO/ZnONRs 的葡萄糖传感器在含有尿素、尿酸和抗坏血酸的测试环境中均表现出很强的抗干扰性能。
更新日期:2021-01-01
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