Yang Lihua, Huangfu Changxin, Wang Yu, Qin Yingxi, Qin Aimiao, Feng Liang
CAS Key Laboratory of Separation Sciences for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, PR China; School of Materials Science and Engineering, Guilin University of Technology, Guilin, 541000, PR China.
CAS Key Laboratory of Separation Sciences for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, PR China.
Talanta. 2024 Dec 1;280:126716. doi: 10.1016/j.talanta.2024.126716. Epub 2024 Aug 19.
The small molecule aldehydes are volatile organic compounds (VOCs), possessing cytotoxicity and carcinogenicity. Long-term exposure can pose a serious threat to human health. Based on an in-situ reduction colorimetric method to generate silver nanoparticles and induce colorimetric response, we proposed a silver-loaded paper-based colorimetric sensor array for visually detecting and differentiating five relatively common trace small molecule aldehyde gases. The silver ions are immobilized onto a porous filter paper and stabilized by complexing agents of branched polyethyleneimine, ethylenediamine, and 1,6-diaminohexane, respectively. The as-fabricated sensor array expresses remarkable stability and capacity to resist humidity. The qualitative analysis reveals that the sensor array has excellent selectivity for aldehyde gases and displays remarkable anti-interference ability. The quantitative analysis indicates that the sensor array exhibits superior sensitivity for five aldehyde gases, with limits of detection (LODs) of 9.0 ppb for formaldehyde (FA), 3.1 ppm for acetaldehyde (AA), 3.5 ppm for propionaldehyde (PA), 23.8 ppb for glutaric dialdehyde (GD), and 71.5 ppb for hydroxy formaldehyde (HF), respectively. Importantly, these LODs are all comfortably below their respective permissible exposure limits. A unique colorimetric response fingerprint is observed for each analyte. Standard chemometric methods illustrate that the sensor array has excellent clustering capability for these aldehyde gases. Additionally, the sensor array's response is irreversible and possesses outstanding performance for cumulative monitoring. This colorimetric sensor array based on silver ions reduced to silver nanoparticles offers a novel detection method for the continuous, ultrasensitive, and visual detection of trace airborne pollutants.
小分子醛类是挥发性有机化合物（VOCs），具有细胞毒性和致癌性。长期接触会对人类健康构成严重威胁。基于一种原位还原比色法生成银纳米颗粒并引发比色响应，我们提出了一种基于纸基的负载银比色传感器阵列，用于视觉检测和区分五种相对常见的痕量小分子醛类气体。银离子分别固定在多孔滤纸上，并通过支化聚乙烯亚胺、乙二胺和1,6 - 二氨基己烷的络合剂进行稳定化处理。所制备的传感器阵列表现出卓越的稳定性和抗湿度能力。定性分析表明，该传感器阵列对醛类气体具有优异的选择性，并显示出显著的抗干扰能力。定量分析表明，该传感器阵列对五种醛类气体具有出色的灵敏度，甲醛（FA）的检测限（LOD）为9.0 ppb，乙醛（AA）为3.1 ppm，丙醛（PA）为3.5 ppm，戊二醛（GD）为23.8 ppb，羟基甲醛（HF）为71.5 ppb。重要的是，这些检测限均远低于各自的允许暴露限值。每种分析物都观察到独特的比色响应指纹图谱。标准化学计量方法表明，该传感器阵列对这些醛类气体具有出色的聚类能力。此外，该传感器阵列的响应是不可逆的，并且在累积监测方面具有出色的性能。这种基于银离子还原为银纳米颗粒的比色传感器阵列，为痕量空气污染物的连续、超灵敏和可视化检测提供了一种新颖的检测方法。
