Ruiz-Gonzalez, A;
Huang, J;
Xun, C;
Chhabra, R;
Lee, R;
Yizhong, H;
Davenport, A;
... Choy, KL; + view all
(2022)
Ultrasensitive and miniaturized ion sensors using ionically imprinted nanostructured films.
Applied Materials Today
, 29
, Article 101600. 10.1016/j.apmt.2022.101600.
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Abstract
The detection of ions is essential for a wide range of applications including biomedical diagnosis, and environmental monitoring among others. However, current ion sensors are based on thick sensing films (∼100 µm), requiring time-consuming preparations, and they have a limit to their sensitivity of 59 mV.Log [C]−1. Consequently, these sensors cannot be applied for high-precision applications that require high sensitivity and reduced dimensions. Furthermore, the research of anion sensors is hampered given the limited availability of molecular receptors or ionophores with acceptable performances. In this work, we overcome these limitations using a 300 nm thick sensing film based on nanoporous ion-imprinted core-shell silica/gold grafted onto a 50 nm gold film. The sensing films were highly selective towards chloride ions, compared to other anions such as nitrate, sulphate and carbonate. Moreover, this nanostructured film exhibited over 3-fold higher sensitivity (-186.4 mV.Log [C]−1) towards chloride ions compared to commercial devices. This breakthrough has led to the fabrication of the smallest and most sensitive reported anion sensor working on open circuit potentiometry, with an exceptional selectivity towards chloride ions that could be used for the measurement of chloride ions in human serum.
| Type: | Article |
|---|---|
| Title: | Ultrasensitive and miniaturized ion sensors using ionically imprinted nanostructured films |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.apmt.2022.101600 |
| Publisher version: | https://doi.org/10.1016/j.apmt.2022.101600 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Technology, Materials Science, Multidisciplinary, Materials Science, Ion imprinting, Nanoporous silica, Ion sensor, SOLID-PHASE EXTRACTION, MESOPOROUS SILICA, SELECTIVE SEPARATION, CHLORIDE-ION, POLYMER, RECOGNITION, REMOVAL, LEAD, NANOPARTICLES, BICARBONATE |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Medicine UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office > Institute for Materials Discovery |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10159752 |
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