Detection of Exhaled Volatile Organic Compounds Improved by Hollow Nanocages of Layered Double Hydroxide on Ag Nanowires

作者：Xuezhi Qiao, Xiangyu Chen, Chuanhui Huang, Ailin Li, Xiao Li, Zhili Lu, Tie Wang · 发表于：Angewandte Chemie International Edition · 年份：2019 · DOI：10.1002/anie.201910865 · 被引用次数：138 · 研究领域：Gas Sensing Nanomaterials and Sensors、Gold and Silver Nanoparticles Synthesis and Applications、Advanced Nanomaterials in Catalysis

Abstract To detect biomarkers from human exhalation, air flow dynamics on the nanoparticle surface were explored by a surface‐enhanced Raman scattering (SERS) sensor. A hollow Co‐Ni layered double hydroxide (LDH) nanocage on Ag nanowires (Ag@LDH) was prepared. Ag nanowires provided amplified Raman signals for trace determination; hollow LDH nanocages served as the gaseous confinement cavity to improve capture and adsorption of gaseous analytes. The Raman intensity and logarithmic analyte concentration exhibit an approximately linear relationship; the detection limit of SERS sensors for aldehyde is 1.9×10 −9 v/v (1.9 ppb). Various aldehydes in mixed mimetic gas are distinguished by Raman spectra statistical analysis assisted by multivariate methods, including principal component analysis and hierarchical cluster analysis. The information was recorded in a barcode, which can be used for the design and development of a desktop SERS sensor analysis system for large‐scale lung cancer detection.