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- W4252586914 abstract "Abstract Sensors play a significant role in the detection of toxic species and explosives, and in the remote control of chemical processes. In this work, we report a single‐molecule‐based pH switch/sensor that exploits the sensitivity of dye molecules to environmental pH to build metal–molecule–metal (m‐M‐m) devices using the scanning tunneling microscopy (STM) break junction technique. Dyes undergo pH‐induced electronic modulation due to reversible structural transformation between a conjugated and a nonconjugated form, resulting in a change in the HOMO–LUMO gap. The dye‐mediated m‐M‐m devices react to environmental pH with a high on/off ratio (≈100:1) of device conductivity. Density functional theory (DFT) calculations, carried out under the non‐equilibrium Green’s function (NEGF) framework, model charge transport through these molecules in the two possible forms and confirm that the HOMO–LUMO gap of dyes is nearly twice as large in the nonconjugated form as in the conjugated form." @default.
- W4252586914 created "2022-05-12" @default.
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- W4252586914 date "2013-12-11" @default.
- W4252586914 modified "2023-10-18" @default.
- W4252586914 title "Single-Molecule Sensing of Environmental pH-an STM Break Junction and NEGF-DFT Approach" @default.
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- W4252586914 doi "https://doi.org/10.1002/ange.201308398" @default.
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