Affiliation:
1. State Key Laboratory of Fluid Power and Mechatronic Systems, College of Biosystems Engineering and Food Science Zhejiang University Hangzhou Zhejiang 310058 China
2. Key Laboratory of Precision Medicine in Diagnosis and Monitoring Research of Zhejiang Province, Sir Run Run Shaw Hospital Zhejiang University Hangzhou Zhejiang 310016 China
3. Ningbo Research Institute Zhejiang University Ningbo Zhejiang 315100 China
Abstract
AbstractPaper‐based analytical devices as a low‐cost and point‐of‐care sensing platform have attracted widespread research interest. However, the device fabrication and signal readout remain a challenge for their real‐world applications. Herein, a technically simple paper‐based sensor is developed by taking advantage of the easily accessible paper and the plasmonic property of gold nanomaterials. The sensing mechanism relies on the iodide‐mediated surface etching of gold nanostars that induces a color change from blue to red of the paper strip. The versatility of the paper substrate in size, shape, and materials allows for the facile immobilization of gold nanostars by a simple immersing method, which is easy to operate and free from specialized skills and equipment. In addition, the readout of the paper strip can be conveniently visualized by the naked eye or through a smartphone. This paper‐based sensor advantages in low cost, light weight, easy handling, and disposability that holds great promise as a point‐of‐care detection platform in resource‐constrained settings.
Funder
National Natural Science Foundation of China
Subject
Industrial and Manufacturing Engineering,Mechanics of Materials,General Materials Science