Journal
ANALYST
Volume 145, Issue 11, Pages 3846-3850Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0an00486c
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Funding
- Shenzhen Municipal Science and Technology Innovation Council [JCYJ20170817105950724, JCYJ20180504165819965]
- National Natural Science Foundation of China [21874063]
- SUSTech Core Research Facilities
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Ionophores have been integrated into various electrochemical and optical sensing platforms for the selective detection of ions. Previous ionophore-based optical sensors rely on a H+ chromoionophore as the signal transducer and consequently, suffered from a pH cross-response. pH independent methods were proposed very recently by utilizing the solvatochromic dyes or the exhaustive mode. Here, we report a pH independent sensing principle based on nanospheres containing ionophores. As the ion-exchange occurs, the signal transducer undergoes aggregation-induced emission (AIE) or aggregation-caused quenching (ACQ), leading to a dramatic change in fluorescence intensity. The principle was evaluated on different ionophores including those selective for K+, Na+, Ca2+, and Pb2+. The nanospheres were also introduced into microfluidic chips and successfully applied for the determination of sodium and potassium ion concentrations in diluted blood serum and urine samples.
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