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 MoO_3−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 μM, respectively. The assay permits the visual detection of Sn²⁺ and NO₂⁻ down to concentrations as low as 2 μM and 25 μM, respectively. The applicability of the logic-gate-based colorimetric assay was demonstrated by using it to detect Sn²⁺ and NO₂⁻ in several water sources.

中文翻译：

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使用基于氧化钼纳米材料的三输入逻辑门的可视比色法检测锡（II）和亚硝酸盐

我们报告一个氧化钼（MoO ₃使用Sn）基纳米材料三输入逻辑门²⁺，NO ₂ ^- ，和H ⁺离子作为输入。在酸性条件下，Sn ²⁺能够还原MoO ₃纳米片，生成富氧空位的MoO _{3- x}纳米材料，以及强大的局部表面等离子体共振（LSPR）和强烈的蓝色溶液作为输出信号。当NO ₂ ^-被引入，所述的MoO之间的氧化还原反应_3个纳米片和Sn ²⁺强烈抑制，因为NO ₂ ^-消耗都是H ⁺和Sn ²⁺。三输入逻辑门被用于Sn的视觉比色检测²⁺和NO ₂ ^-在不同的输入状态。检测Sn的比色测定的极限²⁺和NO的最低浓度₂ ^-通过测定可检测的被发现是分别27.5纳米和0.1微米。该测定法允许视觉检测的Sn ²⁺和NO ₂ ^-下降到浓度低至分别2μM和25μM。所述基于逻辑门比色测定的适用性，通过使用它来检测的Sn证明²⁺和NO ₂ ^-在几个水源。