期刊
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
卷 410, 期 18, 页码 4519-4526出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-018-1109-4
关键词
Tin(II) ions; Nitrite; Colorimetric detection; Surface plasmon resonance; Logic gates
资金
- National Natural Science Foundation of China [21705134]
- Longshan Scholars Programme of Southwest University of Science and Technology [17LZX449]
We report a molybdenum oxide (MoO3) nanomaterial-based three-input logic gate that uses Sn2+, NO2 (-), and H+ ions as inputs. Under acidic conditions, Sn2+ is able to reduce MoO3 nanosheets, generating oxygen-vacancy-rich MoO3-x nanomaterials along with strong localized surface plasmon resonance (LSPR) and an intense blue solution as the output signal. When NO2 (-) is introduced, the redox reaction between the MoO3 nanosheets and Sn2+ is strongly inhibited because the NO2 (-) consumes both H+ and Sn2+. The three-input logic gate was employed for the visual colorimetric detection of Sn2+ and NO2 (-) under different input states. The colorimetric assay's limit of detection for Sn2+ and the lowest concentration of NO2 (-) detectable by the assay were found to be 27.5 nM and 0.1 mu M, respectively. The assay permits the visual detection of Sn2+ and NO2 (-) down to concentrations as low as 2 mu M and 25 mu M, respectively. The applicability of the logic-gate-based colorimetric assay was demonstrated by using it to detect Sn2+ and NO2 (-) in several water sources.
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