Free radical sensors based on inner-cutting graphene field-effect transistors.

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ID: 44470
2019
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Abstract
Due to ultra-high reactivity, direct determination of free radicals, especially hydroxyl radical (•OH) with ultra-short lifetime, by field-effect transistor (FET) sensors remains a challenge, which hampers evaluating the role that free radical plays in physiological and pathological processes. Here, we develop a •OH FET sensor with a graphene channel functionalized by metal ion indicators. At the electrolyte/graphene interface, highly reactive •OH cuts the cysteamine to release the metal ions, resulting in surface charge de-doping and a current response. By this inner-cutting strategy, the •OH is selectively detected with a concentration down to 10 M. Quantitative metal ion doping enables modulation of the device sensitivity and a quasi-quantitative detection of •OH generated in aqueous solution or from living cells. Owing to its high sensitivity, selectivity, real-time label-free response, capability for quasi-quantitative detection and user-friendly portable feature, it is valuable in biological research, human health, environmental monitoring, etc.
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wang2019freenature Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Wang, Zhen;Yi, Kongyang;Lin, Qiuyuan;Yang, Lei;Chen, Xiaosong;Chen, Hui;Liu, Yunqi;Wei, Dacheng;
Journal Nature communications
Year 2019
DOI
10.1038/s41467-019-09573-4
URL
Keywords
flexible image sensor low voltage organic electrochemical transistors organic phototransistors volumetric transport

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