MOE Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, 350116, China.
MOE Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, 350116, China; College of Biological Science and Engineering, Fuzhou University, Fuzhou, Fujian, 350116, China.
Anal Chim Acta. 2021 Mar 8;1149:338211. doi: 10.1016/j.aca.2021.338211. Epub 2021 Jan 12.
Hydrogen sulfide (HS), as a hazardous gas, is often found around dump areas. Long term exposure can cause harm to health, it is highly necessary to develop some simple and sensitive methods for on-site HS detection. Herein, a convenient photothermal assay has been designed for the quantitation of HS using a handheld thermometer as readout. Au@Ag nanocubes (Au@Ag NCs), a core-shell nanocomposite with strong light absorption at ∼450 nm, was chosen as a novel photothermal agent in this study. Under the laser irradiation at 450 nm, the Au@Ag NCs show a strong photothermal effect, and a significant temperature enhancement can be measured by the thermometer easily. The presence of HS can lead to the deposition of sulfur onto Au@Ag NCs, altering the localized surface plasmon resonance absorption, size, surface composition, and morphology of Au@Ag NCs and hence leading to the reduction of photothermal effect. The change of the temperature has a linear relationship with the HS concentration in the range of 0.5-80.0 μM with a detection limit of 0.35 μM. By combining with simple sample purification procedures, the developed method has been applied to detect HS in garbage odor gas with satisfactory results.
硫化氢（HS）作为一种有害气体，常在垃圾堆放区发现。长期接触会对健康造成危害，因此非常有必要开发一些简单灵敏的现场 HS 检测方法。在此，我们设计了一种便捷的光热测定法，使用手持温度计作为读出设备，对 HS 进行定量分析。在这项研究中，选择具有在约 450nm 处强吸收的 Au@Ag 纳米立方（Au@Ag NCs）作为新型光热试剂。在 450nm 的激光照射下，Au@Ag NCs 表现出很强的光热效应，通过温度计很容易测量到显著的温度升高。HS 的存在会导致硫沉积在 Au@Ag NCs 上，改变 Au@Ag NCs 的局域表面等离激元共振吸收、尺寸、表面成分和形态，从而降低光热效应。温度的变化与 0.5-80.0μM 范围内的 HS 浓度呈线性关系，检测限为 0.35μM。通过结合简单的样品净化程序，该方法已成功应用于垃圾恶臭气体中 HS 的检测，结果令人满意。
