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    Ultrasensitive detection of miRNA with an antimonene-based surface plasmon resonance sensor

    Year: 2019

    Journal: Nat. Commun., Volume 10, JAN 3

    Authors: Xue, Tianyu; Liang, Weiyuan; Li, Yawen; Sun, Yuanhui; Xiang, Yuanjiang; Zhang, Yupeng; Dai, Zhigao; Duo, Yanhong; Wu, Leiming; Qi, Kun; Shiyananju, Bannur Nanjunda; Zhang, Lijun; Cui, Xiaoqiang; Zhang, Han; Bao, Qiaoliang

    Organizations: National Natural Science Foundation of China [51602305, 51571100, 61722403, 51601131, 61875139]; Science and Technology Innovation Commission of Shenzhen [JCYJ20170818141429525, JCYJ20170818141407343, JCYJ20170818141519879]; China Postdoctoral Science Foundation [2018M633118, 2017M620383, 2018M633102, 2018M633127]; Shenzhen Nanshan District Pilotage Team Program [LHTD20170006]; ARC [IH150100006, FT150100450, CE170100039]; Australian Research Council (ARC) Centre of Excellence in Future Low-Energy Electronics Technologies (FLEET)

    MicroRNA exhibits differential expression levels in cancer and can affect cellular transformation, carcinogenesis and metastasis. Although fluorescence techniques using dye molecule labels have been studied, label-free molecular-level quantification of miRNA is extremely challenging. We developed a surface plasmon resonance sensor based on two-dimensional nanomaterial of antimonene for the specific label-free detection of clinically relevant biomarkers such as miRNA-21 and miRNA-155. First-principles energetic calculations reveal that antimonene has substantially stronger interaction with ssDNA than the graphene that has been previously used in DNA molecule sensing, due to thanking for more delocalized 5s/5p orbitals in antimonene. The detection limit can reach 10 aM, which is 2.3-10,000 times higher than those of existing miRNA sensors. The combination of not-attempted-before exotic sensing material and SPR architecture represents an approach to unlocking the ultrasensitive detection of miRNA and DNA and provides a promising avenue for the early diagnosis, staging, and monitoring of cancer.
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