Molybdenum oxide nanosheets meet ascorbic acid: Tunable surface plasmon resonance and visual colorimetric detection at room temperature
Molybdenum oxide nanosheets meet ascorbic acid: Tunable surface plasmon resonance and visual colorimetric detection at room temperature
复制标题
氧化钼纳米片遇上抗坏血酸：室温下可调谐表面等离子体共振和视觉比色检测
DOI：
10.1016/j.snb.2017.12.058
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发表时间：
2018-04-15
影响因子：
8.4
通讯作者：
He, Yi
中科院分区：
文献类型：
--
作者：
Li, Rui;An, Hongjie;He, Yi
在这里，我们报道了一种简单、快速、环保的方法，在室温酸性环境下，使用抗坏血酸（AA）作为还原剂制备非化学计量的MoO3（MoO3-x）纳米片。所得的 MoO3-x 纳米片在可见光和近红外区域显示出深蓝色和强局域表面等离子体共振 (LSPR)，可以通过改变制备溶液的 pH 值来调节。氢离子嵌入MoO3晶格并与氧原子结合生成水分子，AA的电子转移到Mo阳离子上，导致Mo6+还原并形成氧空位，从而产生局域表面等离子体共振。此外，还开发了一种视觉比色测定法，用于检测水溶液和血清样品中的 AA。 820 nm 处的吸光度与 AA 浓度的对数呈线性关系，范围为 1 mM-100 mM，检测限为 0.09 mM，信噪比为 3。(c) 2017 Elsevier B.V. 保留所有权利。
Here we report a simple, rapid, and environmentally friendly method for the preparation of non-stoichiometric MoO3 (MoO3-x) nanosheets using ascorbic acid (AA) as a reducing agent under an acidic environment at room temperature. The resultant MoO3-x nanosheets show an intense blue color andstrong localized surface plasmon resonance (LSPR) in the visible and near-infrared region, which can be tuned by changing the pH values of the preparation solution. The hydrogen ions intercalate into the lattice of MoO3 and bond to oxygen atoms to generate water molecules, and the electron of the AA is transferred to Mo cations, which results in the reduction of Mo6+ and formation of oxygen vacancies, giving rise to the LSPR. Additionally, a visual colorimetric assay has been developed for the detection of AA in aqueous solutions and serum samples. The absorbance at 820 nm is linearly related to the logarithm of the AA concentration in the range of 1 mM-100 mM with a limit of detection of 0.09 mM at a signal-to-noise ratio of 3. (c) 2017 Elsevier B.V. All rights reserved.