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首页> 外文期刊>New Journal of Chemistry >Reproducible mesoporous silica-coated gold@silver nanoprobes for the bright colorimetric sensing of ascorbic acid
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Reproducible mesoporous silica-coated gold@silver nanoprobes for the bright colorimetric sensing of ascorbic acid

机译：可重复的中孔二氧化硅涂覆的金，用于抗坏血酸的明亮比色感测的银纳米体

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摘要

Herein, a colorimetric approach for the detection of ascorbic acid (AA) was developed by controlling the surface chemistry of silica-coated gold nanorod@silver nanoparticles (AuNR@Ag@mSiO(2)). The mesoporous silica coating exhibits an elastic feature and provides a stable microenvironment around the AuNR@Ag nanoparticles. The sensing strategy was assisted by permanganate (MnO4-), a strong oxidizing agent, via the oxidation of silver atoms to silver ions; this resulted in the disappearance of the particle shell. The absence of the silver shell caused a color change and red shift of the UV-Vis absorption band of the colloidal solution. On the other hand, the presence of AA molecules reduced the silver ions and restored the silver shell; this was associated with the recovery of the original morphology, a color change and a red shift in the absorption band. The removal and re-growth of the Ag shell on Au NRs drastically affected the localized surface plasmon resonance (LSPR) property, which provided a strategy for the colorimetric detection of AA. A good linear relationship was obtained with a low detection limit (0.03 mu M), and the method was successfully used to detect AA in serum with the satisfactory recovery of 93.8-104.5%. Furthermore, due to the removal and re-growth of the silver shell, the proposed sensor exhibits excellent reversibility and potential for practical applications.
机译：这里，通过控制二氧化硅涂覆的金纳米棒@银纳米粒子的表面化学来开发用于检测抗坏血酸（AA）的比色方法（AUNR @ AG @ MSIO（2））。中孔二氧化硅涂层具有弹性特征，并在AUNR @ Ag纳米粒子周围提供稳定的微环境。通过氧化银原子至银离子的氧化剂（MNO4-），强氧化剂辅助感测策略;这导致颗粒壳消失。不存在银壳导致胶体溶液的UV-Vis吸收带的颜色变化和红色移位。另一方面，AA分子的存在降低了银离子并恢复了银壳;这与原始形态的恢复有关，颜色变化和吸收带中的红色移位。 Au NRS上的Ag壳的去除和重新生长大大影响了局部表面等离子体共振（LSPR）属性，其提供了一种用于AA的比色检测的策略。通过低检测极限（0.03μm）获得良好的线性关系，并且该方法成功地检测血清中的AA，令人满意的恢复为93.8-104.5％。此外，由于银壳的去除和重新生长，所提出的传感器表现出优异的可逆性和实际应用的潜力。

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  • 来源
    《New Journal of Chemistry》 |2019年第27期|共9页
  • 作者

    Chen Ling; Lin Meng; Yang Ping;

  • 作者单位

    Univ Jinan Sch Mat Sci &

    Engn Jinan 250022 Shandong Peoples R China;

    Shandong Univ Key Lab Colloid &

    Interface Chem State Educ Minist Sch Chem &

    Chem Engn Jinan 250100 Shandong Peoples R China;

    Univ Jinan Sch Mat Sci &

    Engn Jinan 250022 Shandong Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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