Simple and sensitive colorimetric detection of a trace amount of 2,4,6-trinitrotoluene (TNT) with QD multilayer-modified microchannel assays†,Materials Chemistry Frontiers

当前位置： X-MOL 学术 › Mater. Chem. Front. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Simple and sensitive colorimetric detection of a trace amount of 2,4,6-trinitrotoluene (TNT) with QD multilayer-modified microchannel assays†
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2018-10-19 00:00:00 , DOI: 10.1039/c8qm00430g
Tao Hu _{1,

2,

3,

4} , Wen Sang _{1,

2,

3,

4} , Ke Chen _{1,

2,

3,

4} , Hongxi Gu _{4,

5,

6,

7,

8} , Zhonghua Ni _{1,

2,

3,

4} , Shaoqin Liu _{4,

5,

6,

7,

8}

Affiliation

Rapid and selective detection of trace levels of nitroaromatic explosives, in particular, 2,4,6-trinitrotoluene (TNT), is a key challenge for both public security and environmental monitoring. In the present study, we fabricated two colored quantum dot (QD) multilayer-decorated microchannel assays via a layer-by-layer assembly technique. Due to the energy transfer between red QDs and green QDs, the fluorescence intensity of the red QDs significantly enhanced. When the assays were exposed to TNT aqueous solution, the formation of Meisenheimer complexes between the electron-poor aromatic groups of TNT and electron-rich amines on the surface of the red QDs caused fluorescence quenching of the red QDs and partial recovery of the green QDs, thus resulting in multicolor changes of the multilayers from red to yellow to green and then to colorless. The assay has a broad linear range of 10 ppt to 10⁷ ppt and low detection limit (5.24 ppt) for TNT. The specificity of this assay for the detection of TNT is demonstrated against several TNT analogs. Additionally, this technique was successfully applied to detect TNT concentration in different water samples. Due to its simplicity, short detection time, high sensitivity and low cost, the assay is well suited for the detection of ultratrace levels of TNT.

中文翻译：

使用QD多层修饰微通道测定法对痕量的2,4,6-三硝基甲苯（TNT）进行简单而灵敏的比色检测†

快速和选择性地检测痕量的硝基芳族炸药，尤其是2,4,6-三硝基甲苯（TNT），是公安和环境监测的主要挑战。在本研究中，我们制造的两个着色的量子点（QD）的装饰多层微通道测定通过逐层组装技术。由于红色量子点和绿色量子点之间的能量转移，红色量子点的荧光强度显着增强。当将测定暴露于TNT水溶液时，TNT的电子贫乏芳族基团与红色QD表面上的富电子胺之间形成迈森海默络合物，导致红色QD的荧光猝灭和绿色QD的部分回收。，从而导致多层材料从红色到黄色到绿色再到无色的多色变化。该测定法的线性范围很宽，为10 ppt至10 ⁷ppt和TNT的检测下限（5.24 ppt）。针对几种TNT类似物证明了这种测定TNT的特异性。此外，该技术已成功应用于检测不同水样中的TNT浓度。由于该方法简单，检测时间短，灵敏度高且成本低，因此非常适合检测TNT的超痕量水平。

更新日期：2018-10-19

点击分享查看原文

点击收藏

阅读更多本刊最新论文