AND molecular logic using semiconductor quantum dots

Navneet Kaur, Narinder Singh, Bridgeen Callan, John Callan

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


CdSe/ZnS quantum clots (QD) have been surface functionalised with mercaptoaniline and N-(o-methoxyphenyl)aza-15-crown-5 receptors, the former serving as a receptor for protons with the latter serving as a receptor for sodium ions. In conditions of low protons and sodium ions the QD fluorescence Was quenched by a photoinduced electron transfer (PET) process from the receptors to the excited QD. The simultaneous addition of both protons and sodium ions, however, restored the QD emission while the independent addition of either ion had no effect. Thus, the conditions of a two input AND molecular logic gate were satified with protons and sodium ions as inputs and 560 nm QD fluorescence as Output. (C) 2009 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)88-91
Issue number1
Publication statusPublished (in print/issue) - Jan 2010


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