Agarose-Based Hydrogel Film with Embedded Oriented Photonic Nanochains for Sensing pH

Author:

Xiao Dunyi1,Ma Huiru2,Luo Wei1,Guan Jianguo34ORCID

Affiliation:

1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

2. School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, China

3. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

4. Wuhan Institute of Photochemistry and Technology, 7 North Bingang Road, Wuhan 430083, China

Abstract

Responsive photonic crystal hydrogel sensors are renowned for their colorimetric sensing ability and can be utilized in many fields such as medical diagnosis, environmental detection, food safety, and industrial production. Previously, our group invented responsive photonic nanochains (RPNCs), which improve the response speed of photonic crystal hydrogel sensors by at least 2 to 3 orders of magnitude. However, RPNCs are dispersed in a liquid medium, which needs a magnetic field to orient them for the generation of structural colors. In addition, during repeated use, the process of cleaning and redispersing can cause entanglement, breakage, and a loss of RPNCs, resulting in poor stability. Moreover, when mixing with the samples in liquid, the RPNCs may lead to the contamination of the samples being tested. In this paper, we incorporate one-dimensional oriented RPNCs with agarose gel film to prepare heterogeneous hydrogel films. Thanks to the non-responsive and porous nature of the agarose gel, the protons diffuse freely in the gel, which facilitates the fast response of the RPNCs. Furthermore, the “frozen” RPNCs in agarose gel not only enable the display of structural colors without the need for a magnet but also improve the cycling stability and long-term durability of the sensor, and will not contaminate the samples. This work paves the way for the application of photonic crystal sensors.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Hubei Province

Innovation Team in Key Areas of the Innovation Talent Promotion Plan

Publisher

MDPI AG

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