A Simple Method for Developing a Hand‐Drawn Paper‐Based Sensor for Mercury; Using Green Synthesized Silver Nanoparticles and Smartphone as a Hand‐Held‐Device for Colorimetric Assay,Global Challenges

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A Simple Method for Developing a Hand‐Drawn Paper‐Based Sensor for Mercury; Using Green Synthesized Silver Nanoparticles and Smartphone as a Hand‐Held‐Device for Colorimetric Assay
Global Challenges ( IF 4.4 ) Pub Date : 2021-02-15 , DOI: 10.1002/gch2.202000099
Maryamosadat Mavaei ₁ , Azam Chahardoli ₁ , Ali Fattahi _{1,

2,

3} , Alireza Khoshroo ₁

Affiliation

Mercury ions are highly toxic at trace levels, and its pollution has posed a significant threat to the environment and public health, where current detection methods mainly require laborious operation and expensive instrumentation. Herein, a simple, cost‐effective, instrument‐free approach for selective detection of Hg²⁺ based on a hand‐drawn paper‐based naked‐eye colorimetric device is developed. To develop a hand‐drawn paper‐based device, a crayon is used to build hydrophobic barriers and a paper puncher is applied to obtain patterns as a sensing zone. A green method for the synthesis of silver nanoparticles (AgNPs) is applied using Achillea Wilhelmsii (Aw) extract. The sensing ability of Aw‐AgNPs toward Hg²⁺ is investigated in both solution‐phase and paper substrate loaded with Aw‐AgNPs using colorimetric methods. For the paper‐based sensor, the quantification of the target relies on the visual readout of a color‐changed sensing zone modified with Aw‐AgNPs. Under optimal conditions, the color of Aw‐AgNPs in aqueous solution and on the coated paper substrate can change from brown to colorless upon addition of target, with a detection limit of 28 × 10⁻⁹ m and 0.30 × 10⁻⁶ m, respectively. In conclusion, the present study indicates the potential of this hand‐drawn eco‐friendly paper‐based sensor for monitoring of mercury.

中文翻译：

开发手绘纸质汞传感器的简单方法；使用绿色合成银纳米颗粒和智能手机作为手持式设备进行比色测定

汞离子在痕量水平下具有剧毒，其污染对环境和公众健康构成了重大威胁，目前的检测方法主要需要费力的操作和昂贵的仪器。在此，开发了一种基于手绘纸基裸眼比色装置的简单、经济有效、无需仪器的 Hg ²⁺选择性检测方法。为了开发一种手绘纸基设备，使用蜡笔构建疏水屏障，并使用打孔机获得图案作为传感区域。使用 Achillea Wilhelmsii (Aw) 提取物应用一种绿色合成银纳米颗粒 (AgNP) 的方法。使用比色法研究了 Aw-AgNPs 对 Hg ²⁺的传感能力，在溶液相和载有 Aw-AgNPs 的纸基质中进行了研究。对于纸基传感器，目标的量化依赖于用 Aw-AgNP 修饰的变色传感区域的视觉读数。在最佳条件下，加入目标物后，Aw-AgNPs在水溶液中和涂布纸基材上的颜色可以从棕色变为无色，检测限分别为28 × 10 ^-9 m和0.30 × 10 ^-6 m 。总之，本研究表明了这种手绘环保纸基传感器在监测汞方面的潜力。

更新日期：2021-04-08

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