Selective layer-free blood serum ionogram based on ion-specific interactions with a nanotransistor

R. Sivakumarasamy, R. Hartkamp, Bertrand Siboulet, Jean François Dufrêche, K. Nishiguchi, A Fujiwara, N. Clément

Research output: Contribution to journalArticleScientificpeer-review

15 Citations (Scopus)
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Abstract

Despite being ubiquitous in the fields of chemistry and biology, the ion-specific effects of electrolytes pose major challenges for researchers. A lack of understanding about ion-specific surface interactions has hampered the development and application of materials for (bio-)chemical sensor applications. Here, we show that scaling a silicon nanotransistor sensor down to ~25 nm provides a unique opportunity to understand and exploit ion-specific surface interactions, yielding a surface that is highly sensitive to cations and inert to pH. The unprecedented sensitivity of these devices to Na+ and divalent ions can be attributed to an overscreening effect via molecular dynamics. The surface potential of multi-ion solutions is well described by the sum of the electrochemical potentials of each cation, enabling selective measurements of a target ion concentration without requiring a selective organic layer. We use these features to construct a blood serum ionogram for Na+, K+, Ca2+ and Mg2+, in an important step towards the development of a versatile, durable and mobile chemical or blood diagnostic tool.

Original languageEnglish
Pages (from-to)464-470
JournalNature Materials
Volume17
DOIs
Publication statusPublished - 2018

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    Sivakumarasamy, R., Hartkamp, R., Siboulet, B., Dufrêche, J. F., Nishiguchi, K., Fujiwara, A., & Clément, N. (2018). Selective layer-free blood serum ionogram based on ion-specific interactions with a nanotransistor. Nature Materials, 17, 464-470. https://doi.org/10.1038/s41563-017-0016-y